Merge branch 'WIP.x86-pti.entry-for-linus' of git://git.kernel.org/pub/scm/linux...

[mirror_ubuntu-bionic-kernel.git] / drivers / gpu / drm / nouveau / dispnv04 / crtc.c

/*
 * Copyright 1993-2003 NVIDIA, Corporation
 * Copyright 2006 Dave Airlie
 * Copyright 2007 Maarten Maathuis
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */
#include <linux/pm_runtime.h>

#include <drm/drmP.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_plane_helper.h>

#include "nouveau_drv.h"
#include "nouveau_reg.h"
#include "nouveau_ttm.h"
#include "nouveau_bo.h"
#include "nouveau_gem.h"
#include "nouveau_encoder.h"
#include "nouveau_connector.h"
#include "nouveau_crtc.h"
#include "hw.h"
#include "nvreg.h"
#include "nouveau_fbcon.h"
#include "disp.h"

#include <subdev/bios/pll.h>
#include <subdev/clk.h>

static int
nv04_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
                        struct drm_framebuffer *old_fb);

static void
crtc_wr_cio_state(struct drm_crtc *crtc, struct nv04_crtc_reg *crtcstate, int index)
{
        NVWriteVgaCrtc(crtc->dev, nouveau_crtc(crtc)->index, index,
                       crtcstate->CRTC[index]);
}

static void nv_crtc_set_digital_vibrance(struct drm_crtc *crtc, int level)
{
        struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc);
        struct drm_device *dev = crtc->dev;
        struct nv04_crtc_reg *regp = &nv04_display(dev)->mode_reg.crtc_reg[nv_crtc->index];

        regp->CRTC[NV_CIO_CRE_CSB] = nv_crtc->saturation = level;
        if (nv_crtc->saturation && nv_gf4_disp_arch(crtc->dev)) {
                regp->CRTC[NV_CIO_CRE_CSB] = 0x80;
                regp->CRTC[NV_CIO_CRE_5B] = nv_crtc->saturation << 2;
                crtc_wr_cio_state(crtc, regp, NV_CIO_CRE_5B);
        }
        crtc_wr_cio_state(crtc, regp, NV_CIO_CRE_CSB);
}

static void nv_crtc_set_image_sharpening(struct drm_crtc *crtc, int level)
{
        struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc);
        struct drm_device *dev = crtc->dev;
        struct nv04_crtc_reg *regp = &nv04_display(dev)->mode_reg.crtc_reg[nv_crtc->index];

        nv_crtc->sharpness = level;
        if (level < 0)  /* blur is in hw range 0x3f -> 0x20 */
                level += 0x40;
        regp->ramdac_634 = level;
        NVWriteRAMDAC(crtc->dev, nv_crtc->index, NV_PRAMDAC_634, regp->ramdac_634);
}

#define PLLSEL_VPLL1_MASK                               \
        (NV_PRAMDAC_PLL_COEFF_SELECT_SOURCE_PROG_VPLL   \
         | NV_PRAMDAC_PLL_COEFF_SELECT_VCLK_RATIO_DB2)
#define PLLSEL_VPLL2_MASK                               \
        (NV_PRAMDAC_PLL_COEFF_SELECT_PLL_SOURCE_VPLL2           \
         | NV_PRAMDAC_PLL_COEFF_SELECT_VCLK2_RATIO_DB2)
#define PLLSEL_TV_MASK                                  \
        (NV_PRAMDAC_PLL_COEFF_SELECT_TV_VSCLK1          \
         | NV_PRAMDAC_PLL_COEFF_SELECT_TV_PCLK1         \
         | NV_PRAMDAC_PLL_COEFF_SELECT_TV_VSCLK2        \
         | NV_PRAMDAC_PLL_COEFF_SELECT_TV_PCLK2)

/* NV4x 0x40.. pll notes:
 * gpu pll: 0x4000 + 0x4004
 * ?gpu? pll: 0x4008 + 0x400c
 * vpll1: 0x4010 + 0x4014
 * vpll2: 0x4018 + 0x401c
 * mpll: 0x4020 + 0x4024
 * mpll: 0x4038 + 0x403c
 *
 * the first register of each pair has some unknown details:
 * bits 0-7: redirected values from elsewhere? (similar to PLL_SETUP_CONTROL?)
 * bits 20-23: (mpll) something to do with post divider?
 * bits 28-31: related to single stage mode? (bit 8/12)
 */

static void nv_crtc_calc_state_ext(struct drm_crtc *crtc, struct drm_display_mode * mode, int dot_clock)
{
        struct drm_device *dev = crtc->dev;
        struct nouveau_drm *drm = nouveau_drm(dev);
        struct nvkm_bios *bios = nvxx_bios(&drm->client.device);
        struct nvkm_clk *clk = nvxx_clk(&drm->client.device);
        struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc);
        struct nv04_mode_state *state = &nv04_display(dev)->mode_reg;
        struct nv04_crtc_reg *regp = &state->crtc_reg[nv_crtc->index];
        struct nvkm_pll_vals *pv = &regp->pllvals;
        struct nvbios_pll pll_lim;

        if (nvbios_pll_parse(bios, nv_crtc->index ? PLL_VPLL1 : PLL_VPLL0,
                            &pll_lim))
                return;

        /* NM2 == 0 is used to determine single stage mode on two stage plls */
        pv->NM2 = 0;

        /* for newer nv4x the blob uses only the first stage of the vpll below a
         * certain clock.  for a certain nv4b this is 150MHz.  since the max
         * output frequency of the first stage for this card is 300MHz, it is
         * assumed the threshold is given by vco1 maxfreq/2
         */
        /* for early nv4x, specifically nv40 and *some* nv43 (devids 0 and 6,
         * not 8, others unknown), the blob always uses both plls.  no problem
         * has yet been observed in allowing the use a single stage pll on all
         * nv43 however.  the behaviour of single stage use is untested on nv40
         */
        if (drm->client.device.info.chipset > 0x40 && dot_clock <= (pll_lim.vco1.max_freq / 2))
                memset(&pll_lim.vco2, 0, sizeof(pll_lim.vco2));


        if (!clk->pll_calc(clk, &pll_lim, dot_clock, pv))
                return;

        state->pllsel &= PLLSEL_VPLL1_MASK | PLLSEL_VPLL2_MASK | PLLSEL_TV_MASK;

        /* The blob uses this always, so let's do the same */
        if (drm->client.device.info.family == NV_DEVICE_INFO_V0_CURIE)
                state->pllsel |= NV_PRAMDAC_PLL_COEFF_SELECT_USE_VPLL2_TRUE;
        /* again nv40 and some nv43 act more like nv3x as described above */
        if (drm->client.device.info.chipset < 0x41)
                state->pllsel |= NV_PRAMDAC_PLL_COEFF_SELECT_SOURCE_PROG_MPLL |
                                 NV_PRAMDAC_PLL_COEFF_SELECT_SOURCE_PROG_NVPLL;
        state->pllsel |= nv_crtc->index ? PLLSEL_VPLL2_MASK : PLLSEL_VPLL1_MASK;

        if (pv->NM2)
                NV_DEBUG(drm, "vpll: n1 %d n2 %d m1 %d m2 %d log2p %d\n",
                         pv->N1, pv->N2, pv->M1, pv->M2, pv->log2P);
        else
                NV_DEBUG(drm, "vpll: n %d m %d log2p %d\n",
                         pv->N1, pv->M1, pv->log2P);

        nv_crtc->cursor.set_offset(nv_crtc, nv_crtc->cursor.offset);
}

static void
nv_crtc_dpms(struct drm_crtc *crtc, int mode)
{
        struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc);
        struct drm_device *dev = crtc->dev;
        struct nouveau_drm *drm = nouveau_drm(dev);
        unsigned char seq1 = 0, crtc17 = 0;
        unsigned char crtc1A;

        NV_DEBUG(drm, "Setting dpms mode %d on CRTC %d\n", mode,
                                                        nv_crtc->index);

        if (nv_crtc->last_dpms == mode) /* Don't do unnecessary mode changes. */
                return;

        nv_crtc->last_dpms = mode;

        if (nv_two_heads(dev))
                NVSetOwner(dev, nv_crtc->index);

        /* nv4ref indicates these two RPC1 bits inhibit h/v sync */
        crtc1A = NVReadVgaCrtc(dev, nv_crtc->index,
                                        NV_CIO_CRE_RPC1_INDEX) & ~0xC0;
        switch (mode) {
        case DRM_MODE_DPMS_STANDBY:
                /* Screen: Off; HSync: Off, VSync: On -- Not Supported */
                seq1 = 0x20;
                crtc17 = 0x80;
                crtc1A |= 0x80;
                break;
        case DRM_MODE_DPMS_SUSPEND:
                /* Screen: Off; HSync: On, VSync: Off -- Not Supported */
                seq1 = 0x20;
                crtc17 = 0x80;
                crtc1A |= 0x40;
                break;
        case DRM_MODE_DPMS_OFF:
                /* Screen: Off; HSync: Off, VSync: Off */
                seq1 = 0x20;
                crtc17 = 0x00;
                crtc1A |= 0xC0;
                break;
        case DRM_MODE_DPMS_ON:
        default:
                /* Screen: On; HSync: On, VSync: On */
                seq1 = 0x00;
                crtc17 = 0x80;
                break;
        }

        NVVgaSeqReset(dev, nv_crtc->index, true);
        /* Each head has it's own sequencer, so we can turn it off when we want */
        seq1 |= (NVReadVgaSeq(dev, nv_crtc->index, NV_VIO_SR_CLOCK_INDEX) & ~0x20);
        NVWriteVgaSeq(dev, nv_crtc->index, NV_VIO_SR_CLOCK_INDEX, seq1);
        crtc17 |= (NVReadVgaCrtc(dev, nv_crtc->index, NV_CIO_CR_MODE_INDEX) & ~0x80);
        mdelay(10);
        NVWriteVgaCrtc(dev, nv_crtc->index, NV_CIO_CR_MODE_INDEX, crtc17);
        NVVgaSeqReset(dev, nv_crtc->index, false);

        NVWriteVgaCrtc(dev, nv_crtc->index, NV_CIO_CRE_RPC1_INDEX, crtc1A);
}

static void
nv_crtc_mode_set_vga(struct drm_crtc *crtc, struct drm_display_mode *mode)
{
        struct drm_device *dev = crtc->dev;
        struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc);
        struct nv04_crtc_reg *regp = &nv04_display(dev)->mode_reg.crtc_reg[nv_crtc->index];
        struct drm_framebuffer *fb = crtc->primary->fb;

        /* Calculate our timings */
        int horizDisplay        = (mode->crtc_hdisplay >> 3)            - 1;
        int horizStart          = (mode->crtc_hsync_start >> 3)         + 1;
        int horizEnd            = (mode->crtc_hsync_end >> 3)           + 1;
        int horizTotal          = (mode->crtc_htotal >> 3)              - 5;
        int horizBlankStart     = (mode->crtc_hdisplay >> 3)            - 1;
        int horizBlankEnd       = (mode->crtc_htotal >> 3)              - 1;
        int vertDisplay         = mode->crtc_vdisplay                   - 1;
        int vertStart           = mode->crtc_vsync_start                - 1;
        int vertEnd             = mode->crtc_vsync_end                  - 1;
        int vertTotal           = mode->crtc_vtotal                     - 2;
        int vertBlankStart      = mode->crtc_vdisplay                   - 1;
        int vertBlankEnd        = mode->crtc_vtotal                     - 1;

        struct drm_encoder *encoder;
        bool fp_output = false;

        list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
                struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);

                if (encoder->crtc == crtc &&
                    (nv_encoder->dcb->type == DCB_OUTPUT_LVDS ||
                     nv_encoder->dcb->type == DCB_OUTPUT_TMDS))
                        fp_output = true;
        }

        if (fp_output) {
                vertStart = vertTotal - 3;
                vertEnd = vertTotal - 2;
                vertBlankStart = vertStart;
                horizStart = horizTotal - 5;
                horizEnd = horizTotal - 2;
                horizBlankEnd = horizTotal + 4;
#if 0
                if (dev->overlayAdaptor && drm->client.device.info.family >= NV_DEVICE_INFO_V0_CELSIUS)
                        /* This reportedly works around some video overlay bandwidth problems */
                        horizTotal += 2;
#endif
        }

        if (mode->flags & DRM_MODE_FLAG_INTERLACE)
                vertTotal |= 1;

#if 0
        ErrorF("horizDisplay: 0x%X \n", horizDisplay);
        ErrorF("horizStart: 0x%X \n", horizStart);
        ErrorF("horizEnd: 0x%X \n", horizEnd);
        ErrorF("horizTotal: 0x%X \n", horizTotal);
        ErrorF("horizBlankStart: 0x%X \n", horizBlankStart);
        ErrorF("horizBlankEnd: 0x%X \n", horizBlankEnd);
        ErrorF("vertDisplay: 0x%X \n", vertDisplay);
        ErrorF("vertStart: 0x%X \n", vertStart);
        ErrorF("vertEnd: 0x%X \n", vertEnd);
        ErrorF("vertTotal: 0x%X \n", vertTotal);
        ErrorF("vertBlankStart: 0x%X \n", vertBlankStart);
        ErrorF("vertBlankEnd: 0x%X \n", vertBlankEnd);
#endif

        /*
        * compute correct Hsync & Vsync polarity
        */
        if ((mode->flags & (DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NHSYNC))
                && (mode->flags & (DRM_MODE_FLAG_PVSYNC | DRM_MODE_FLAG_NVSYNC))) {

                regp->MiscOutReg = 0x23;
                if (mode->flags & DRM_MODE_FLAG_NHSYNC)
                        regp->MiscOutReg |= 0x40;
                if (mode->flags & DRM_MODE_FLAG_NVSYNC)
                        regp->MiscOutReg |= 0x80;
        } else {
                int vdisplay = mode->vdisplay;
                if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
                        vdisplay *= 2;
                if (mode->vscan > 1)
                        vdisplay *= mode->vscan;
                if (vdisplay < 400)
                        regp->MiscOutReg = 0xA3;        /* +hsync -vsync */
                else if (vdisplay < 480)
                        regp->MiscOutReg = 0x63;        /* -hsync +vsync */
                else if (vdisplay < 768)
                        regp->MiscOutReg = 0xE3;        /* -hsync -vsync */
                else
                        regp->MiscOutReg = 0x23;        /* +hsync +vsync */
        }

        /*
         * Time Sequencer
         */
        regp->Sequencer[NV_VIO_SR_RESET_INDEX] = 0x00;
        /* 0x20 disables the sequencer */
        if (mode->flags & DRM_MODE_FLAG_CLKDIV2)
                regp->Sequencer[NV_VIO_SR_CLOCK_INDEX] = 0x29;
        else
                regp->Sequencer[NV_VIO_SR_CLOCK_INDEX] = 0x21;
        regp->Sequencer[NV_VIO_SR_PLANE_MASK_INDEX] = 0x0F;
        regp->Sequencer[NV_VIO_SR_CHAR_MAP_INDEX] = 0x00;
        regp->Sequencer[NV_VIO_SR_MEM_MODE_INDEX] = 0x0E;

        /*
         * CRTC
         */
        regp->CRTC[NV_CIO_CR_HDT_INDEX] = horizTotal;
        regp->CRTC[NV_CIO_CR_HDE_INDEX] = horizDisplay;
        regp->CRTC[NV_CIO_CR_HBS_INDEX] = horizBlankStart;
        regp->CRTC[NV_CIO_CR_HBE_INDEX] = (1 << 7) |
                                          XLATE(horizBlankEnd, 0, NV_CIO_CR_HBE_4_0);
        regp->CRTC[NV_CIO_CR_HRS_INDEX] = horizStart;
        regp->CRTC[NV_CIO_CR_HRE_INDEX] = XLATE(horizBlankEnd, 5, NV_CIO_CR_HRE_HBE_5) |
                                          XLATE(horizEnd, 0, NV_CIO_CR_HRE_4_0);
        regp->CRTC[NV_CIO_CR_VDT_INDEX] = vertTotal;
        regp->CRTC[NV_CIO_CR_OVL_INDEX] = XLATE(vertStart, 9, NV_CIO_CR_OVL_VRS_9) |
                                          XLATE(vertDisplay, 9, NV_CIO_CR_OVL_VDE_9) |
                                          XLATE(vertTotal, 9, NV_CIO_CR_OVL_VDT_9) |
                                          (1 << 4) |
                                          XLATE(vertBlankStart, 8, NV_CIO_CR_OVL_VBS_8) |
                                          XLATE(vertStart, 8, NV_CIO_CR_OVL_VRS_8) |
                                          XLATE(vertDisplay, 8, NV_CIO_CR_OVL_VDE_8) |
                                          XLATE(vertTotal, 8, NV_CIO_CR_OVL_VDT_8);
        regp->CRTC[NV_CIO_CR_RSAL_INDEX] = 0x00;
        regp->CRTC[NV_CIO_CR_CELL_HT_INDEX] = ((mode->flags & DRM_MODE_FLAG_DBLSCAN) ? MASK(NV_CIO_CR_CELL_HT_SCANDBL) : 0) |
                                              1 << 6 |
                                              XLATE(vertBlankStart, 9, NV_CIO_CR_CELL_HT_VBS_9);
        regp->CRTC[NV_CIO_CR_CURS_ST_INDEX] = 0x00;
        regp->CRTC[NV_CIO_CR_CURS_END_INDEX] = 0x00;
        regp->CRTC[NV_CIO_CR_SA_HI_INDEX] = 0x00;
        regp->CRTC[NV_CIO_CR_SA_LO_INDEX] = 0x00;
        regp->CRTC[NV_CIO_CR_TCOFF_HI_INDEX] = 0x00;
        regp->CRTC[NV_CIO_CR_TCOFF_LO_INDEX] = 0x00;
        regp->CRTC[NV_CIO_CR_VRS_INDEX] = vertStart;
        regp->CRTC[NV_CIO_CR_VRE_INDEX] = 1 << 5 | XLATE(vertEnd, 0, NV_CIO_CR_VRE_3_0);
        regp->CRTC[NV_CIO_CR_VDE_INDEX] = vertDisplay;
        /* framebuffer can be larger than crtc scanout area. */
        regp->CRTC[NV_CIO_CR_OFFSET_INDEX] = fb->pitches[0] / 8;
        regp->CRTC[NV_CIO_CR_ULINE_INDEX] = 0x00;
        regp->CRTC[NV_CIO_CR_VBS_INDEX] = vertBlankStart;
        regp->CRTC[NV_CIO_CR_VBE_INDEX] = vertBlankEnd;
        regp->CRTC[NV_CIO_CR_MODE_INDEX] = 0x43;
        regp->CRTC[NV_CIO_CR_LCOMP_INDEX] = 0xff;

        /*
         * Some extended CRTC registers (they are not saved with the rest of the vga regs).
         */

        /* framebuffer can be larger than crtc scanout area. */
        regp->CRTC[NV_CIO_CRE_RPC0_INDEX] =
                XLATE(fb->pitches[0] / 8, 8, NV_CIO_CRE_RPC0_OFFSET_10_8);
        regp->CRTC[NV_CIO_CRE_42] =
                XLATE(fb->pitches[0] / 8, 11, NV_CIO_CRE_42_OFFSET_11);
        regp->CRTC[NV_CIO_CRE_RPC1_INDEX] = mode->crtc_hdisplay < 1280 ?
                                            MASK(NV_CIO_CRE_RPC1_LARGE) : 0x00;
        regp->CRTC[NV_CIO_CRE_LSR_INDEX] = XLATE(horizBlankEnd, 6, NV_CIO_CRE_LSR_HBE_6) |
                                           XLATE(vertBlankStart, 10, NV_CIO_CRE_LSR_VBS_10) |
                                           XLATE(vertStart, 10, NV_CIO_CRE_LSR_VRS_10) |
                                           XLATE(vertDisplay, 10, NV_CIO_CRE_LSR_VDE_10) |
                                           XLATE(vertTotal, 10, NV_CIO_CRE_LSR_VDT_10);
        regp->CRTC[NV_CIO_CRE_HEB__INDEX] = XLATE(horizStart, 8, NV_CIO_CRE_HEB_HRS_8) |
                                            XLATE(horizBlankStart, 8, NV_CIO_CRE_HEB_HBS_8) |
                                            XLATE(horizDisplay, 8, NV_CIO_CRE_HEB_HDE_8) |
                                            XLATE(horizTotal, 8, NV_CIO_CRE_HEB_HDT_8);
        regp->CRTC[NV_CIO_CRE_EBR_INDEX] = XLATE(vertBlankStart, 11, NV_CIO_CRE_EBR_VBS_11) |
                                           XLATE(vertStart, 11, NV_CIO_CRE_EBR_VRS_11) |
                                           XLATE(vertDisplay, 11, NV_CIO_CRE_EBR_VDE_11) |
                                           XLATE(vertTotal, 11, NV_CIO_CRE_EBR_VDT_11);

        if (mode->flags & DRM_MODE_FLAG_INTERLACE) {
                horizTotal = (horizTotal >> 1) & ~1;
                regp->CRTC[NV_CIO_CRE_ILACE__INDEX] = horizTotal;
                regp->CRTC[NV_CIO_CRE_HEB__INDEX] |= XLATE(horizTotal, 8, NV_CIO_CRE_HEB_ILC_8);
        } else
                regp->CRTC[NV_CIO_CRE_ILACE__INDEX] = 0xff;  /* interlace off */

        /*
        * Graphics Display Controller
        */
        regp->Graphics[NV_VIO_GX_SR_INDEX] = 0x00;
        regp->Graphics[NV_VIO_GX_SREN_INDEX] = 0x00;
        regp->Graphics[NV_VIO_GX_CCOMP_INDEX] = 0x00;
        regp->Graphics[NV_VIO_GX_ROP_INDEX] = 0x00;
        regp->Graphics[NV_VIO_GX_READ_MAP_INDEX] = 0x00;
        regp->Graphics[NV_VIO_GX_MODE_INDEX] = 0x40; /* 256 color mode */
        regp->Graphics[NV_VIO_GX_MISC_INDEX] = 0x05; /* map 64k mem + graphic mode */
        regp->Graphics[NV_VIO_GX_DONT_CARE_INDEX] = 0x0F;
        regp->Graphics[NV_VIO_GX_BIT_MASK_INDEX] = 0xFF;

        regp->Attribute[0]  = 0x00; /* standard colormap translation */
        regp->Attribute[1]  = 0x01;
        regp->Attribute[2]  = 0x02;
        regp->Attribute[3]  = 0x03;
        regp->Attribute[4]  = 0x04;
        regp->Attribute[5]  = 0x05;
        regp->Attribute[6]  = 0x06;
        regp->Attribute[7]  = 0x07;
        regp->Attribute[8]  = 0x08;
        regp->Attribute[9]  = 0x09;
        regp->Attribute[10] = 0x0A;
        regp->Attribute[11] = 0x0B;
        regp->Attribute[12] = 0x0C;
        regp->Attribute[13] = 0x0D;
        regp->Attribute[14] = 0x0E;
        regp->Attribute[15] = 0x0F;
        regp->Attribute[NV_CIO_AR_MODE_INDEX] = 0x01; /* Enable graphic mode */
        /* Non-vga */
        regp->Attribute[NV_CIO_AR_OSCAN_INDEX] = 0x00;
        regp->Attribute[NV_CIO_AR_PLANE_INDEX] = 0x0F; /* enable all color planes */
        regp->Attribute[NV_CIO_AR_HPP_INDEX] = 0x00;
        regp->Attribute[NV_CIO_AR_CSEL_INDEX] = 0x00;
}

/**
 * Sets up registers for the given mode/adjusted_mode pair.
 *
 * The clocks, CRTCs and outputs attached to this CRTC must be off.
 *
 * This shouldn't enable any clocks, CRTCs, or outputs, but they should
 * be easily turned on/off after this.
 */
static void
nv_crtc_mode_set_regs(struct drm_crtc *crtc, struct drm_display_mode * mode)
{
        struct drm_device *dev = crtc->dev;
        struct nouveau_drm *drm = nouveau_drm(dev);
        struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc);
        struct nv04_crtc_reg *regp = &nv04_display(dev)->mode_reg.crtc_reg[nv_crtc->index];
        struct nv04_crtc_reg *savep = &nv04_display(dev)->saved_reg.crtc_reg[nv_crtc->index];
        const struct drm_framebuffer *fb = crtc->primary->fb;
        struct drm_encoder *encoder;
        bool lvds_output = false, tmds_output = false, tv_output = false,
                off_chip_digital = false;

        list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
                struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
                bool digital = false;

                if (encoder->crtc != crtc)
                        continue;

                if (nv_encoder->dcb->type == DCB_OUTPUT_LVDS)
                        digital = lvds_output = true;
                if (nv_encoder->dcb->type == DCB_OUTPUT_TV)
                        tv_output = true;
                if (nv_encoder->dcb->type == DCB_OUTPUT_TMDS)
                        digital = tmds_output = true;
                if (nv_encoder->dcb->location != DCB_LOC_ON_CHIP && digital)
                        off_chip_digital = true;
        }

        /* Registers not directly related to the (s)vga mode */

        /* What is the meaning of this register? */
        /* A few popular values are 0x18, 0x1c, 0x38, 0x3c */
        regp->CRTC[NV_CIO_CRE_ENH_INDEX] = savep->CRTC[NV_CIO_CRE_ENH_INDEX] & ~(1<<5);

        regp->crtc_eng_ctrl = 0;
        /* Except for rare conditions I2C is enabled on the primary crtc */
        if (nv_crtc->index == 0)
                regp->crtc_eng_ctrl |= NV_CRTC_FSEL_I2C;
#if 0
        /* Set overlay to desired crtc. */
        if (dev->overlayAdaptor) {
                NVPortPrivPtr pPriv = GET_OVERLAY_PRIVATE(dev);
                if (pPriv->overlayCRTC == nv_crtc->index)
                        regp->crtc_eng_ctrl |= NV_CRTC_FSEL_OVERLAY;
        }
#endif

        /* ADDRESS_SPACE_PNVM is the same as setting HCUR_ASI */
        regp->cursor_cfg = NV_PCRTC_CURSOR_CONFIG_CUR_LINES_64 |
                             NV_PCRTC_CURSOR_CONFIG_CUR_PIXELS_64 |
                             NV_PCRTC_CURSOR_CONFIG_ADDRESS_SPACE_PNVM;
        if (drm->client.device.info.chipset >= 0x11)
                regp->cursor_cfg |= NV_PCRTC_CURSOR_CONFIG_CUR_BPP_32;
        if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
                regp->cursor_cfg |= NV_PCRTC_CURSOR_CONFIG_DOUBLE_SCAN_ENABLE;

        /* Unblock some timings */
        regp->CRTC[NV_CIO_CRE_53] = 0;
        regp->CRTC[NV_CIO_CRE_54] = 0;

        /* 0x00 is disabled, 0x11 is lvds, 0x22 crt and 0x88 tmds */
        if (lvds_output)
                regp->CRTC[NV_CIO_CRE_SCRATCH3__INDEX] = 0x11;
        else if (tmds_output)
                regp->CRTC[NV_CIO_CRE_SCRATCH3__INDEX] = 0x88;
        else
                regp->CRTC[NV_CIO_CRE_SCRATCH3__INDEX] = 0x22;

        /* These values seem to vary */
        /* This register seems to be used by the bios to make certain decisions on some G70 cards? */
        regp->CRTC[NV_CIO_CRE_SCRATCH4__INDEX] = savep->CRTC[NV_CIO_CRE_SCRATCH4__INDEX];

        nv_crtc_set_digital_vibrance(crtc, nv_crtc->saturation);

        /* probably a scratch reg, but kept for cargo-cult purposes:
         * bit0: crtc0?, head A
         * bit6: lvds, head A
         * bit7: (only in X), head A
         */
        if (nv_crtc->index == 0)
                regp->CRTC[NV_CIO_CRE_4B] = savep->CRTC[NV_CIO_CRE_4B] | 0x80;

        /* The blob seems to take the current value from crtc 0, add 4 to that
         * and reuse the old value for crtc 1 */
        regp->CRTC[NV_CIO_CRE_TVOUT_LATENCY] = nv04_display(dev)->saved_reg.crtc_reg[0].CRTC[NV_CIO_CRE_TVOUT_LATENCY];
        if (!nv_crtc->index)
                regp->CRTC[NV_CIO_CRE_TVOUT_LATENCY] += 4;

        /* the blob sometimes sets |= 0x10 (which is the same as setting |=
         * 1 << 30 on 0x60.830), for no apparent reason */
        regp->CRTC[NV_CIO_CRE_59] = off_chip_digital;

        if (drm->client.device.info.family >= NV_DEVICE_INFO_V0_RANKINE)
                regp->CRTC[0x9f] = off_chip_digital ? 0x11 : 0x1;

        regp->crtc_830 = mode->crtc_vdisplay - 3;
        regp->crtc_834 = mode->crtc_vdisplay - 1;

        if (drm->client.device.info.family == NV_DEVICE_INFO_V0_CURIE)
                /* This is what the blob does */
                regp->crtc_850 = NVReadCRTC(dev, 0, NV_PCRTC_850);

        if (drm->client.device.info.family >= NV_DEVICE_INFO_V0_RANKINE)
                regp->gpio_ext = NVReadCRTC(dev, 0, NV_PCRTC_GPIO_EXT);

        if (drm->client.device.info.family >= NV_DEVICE_INFO_V0_CELSIUS)
                regp->crtc_cfg = NV10_PCRTC_CONFIG_START_ADDRESS_HSYNC;
        else
                regp->crtc_cfg = NV04_PCRTC_CONFIG_START_ADDRESS_HSYNC;

        /* Some misc regs */
        if (drm->client.device.info.family == NV_DEVICE_INFO_V0_CURIE) {
                regp->CRTC[NV_CIO_CRE_85] = 0xFF;
                regp->CRTC[NV_CIO_CRE_86] = 0x1;
        }

        regp->CRTC[NV_CIO_CRE_PIXEL_INDEX] = (fb->format->depth + 1) / 8;
        /* Enable slaved mode (called MODE_TV in nv4ref.h) */
        if (lvds_output || tmds_output || tv_output)
                regp->CRTC[NV_CIO_CRE_PIXEL_INDEX] |= (1 << 7);

        /* Generic PRAMDAC regs */

        if (drm->client.device.info.family >= NV_DEVICE_INFO_V0_CELSIUS)
                /* Only bit that bios and blob set. */
                regp->nv10_cursync = (1 << 25);

        regp->ramdac_gen_ctrl = NV_PRAMDAC_GENERAL_CONTROL_BPC_8BITS |
                                NV_PRAMDAC_GENERAL_CONTROL_VGA_STATE_SEL |
                                NV_PRAMDAC_GENERAL_CONTROL_PIXMIX_ON;
        if (fb->format->depth == 16)
                regp->ramdac_gen_ctrl |= NV_PRAMDAC_GENERAL_CONTROL_ALT_MODE_SEL;
        if (drm->client.device.info.chipset >= 0x11)
                regp->ramdac_gen_ctrl |= NV_PRAMDAC_GENERAL_CONTROL_PIPE_LONG;

        regp->ramdac_630 = 0; /* turn off green mode (tv test pattern?) */
        regp->tv_setup = 0;

        nv_crtc_set_image_sharpening(crtc, nv_crtc->sharpness);

        /* Some values the blob sets */
        regp->ramdac_8c0 = 0x100;
        regp->ramdac_a20 = 0x0;
        regp->ramdac_a24 = 0xfffff;
        regp->ramdac_a34 = 0x1;
}

static int
nv_crtc_swap_fbs(struct drm_crtc *crtc, struct drm_framebuffer *old_fb)
{
        struct nv04_display *disp = nv04_display(crtc->dev);
        struct nouveau_framebuffer *nvfb = nouveau_framebuffer(crtc->primary->fb);
        struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc);
        int ret;

        ret = nouveau_bo_pin(nvfb->nvbo, TTM_PL_FLAG_VRAM, false);
        if (ret == 0) {
                if (disp->image[nv_crtc->index])
                        nouveau_bo_unpin(disp->image[nv_crtc->index]);
                nouveau_bo_ref(nvfb->nvbo, &disp->image[nv_crtc->index]);
        }

        return ret;
}

/**
 * Sets up registers for the given mode/adjusted_mode pair.
 *
 * The clocks, CRTCs and outputs attached to this CRTC must be off.
 *
 * This shouldn't enable any clocks, CRTCs, or outputs, but they should
 * be easily turned on/off after this.
 */
static int
nv_crtc_mode_set(struct drm_crtc *crtc, struct drm_display_mode *mode,
                 struct drm_display_mode *adjusted_mode,
                 int x, int y, struct drm_framebuffer *old_fb)
{
        struct drm_device *dev = crtc->dev;
        struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc);
        struct nouveau_drm *drm = nouveau_drm(dev);
        int ret;

        NV_DEBUG(drm, "CTRC mode on CRTC %d:\n", nv_crtc->index);
        drm_mode_debug_printmodeline(adjusted_mode);

        ret = nv_crtc_swap_fbs(crtc, old_fb);
        if (ret)
                return ret;

        /* unlock must come after turning off FP_TG_CONTROL in output_prepare */
        nv_lock_vga_crtc_shadow(dev, nv_crtc->index, -1);

        nv_crtc_mode_set_vga(crtc, adjusted_mode);
        /* calculated in nv04_dfp_prepare, nv40 needs it written before calculating PLLs */
        if (drm->client.device.info.family == NV_DEVICE_INFO_V0_CURIE)
                NVWriteRAMDAC(dev, 0, NV_PRAMDAC_SEL_CLK, nv04_display(dev)->mode_reg.sel_clk);
        nv_crtc_mode_set_regs(crtc, adjusted_mode);
        nv_crtc_calc_state_ext(crtc, mode, adjusted_mode->clock);
        return 0;
}

static void nv_crtc_save(struct drm_crtc *crtc)
{
        struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc);
        struct drm_device *dev = crtc->dev;
        struct nv04_mode_state *state = &nv04_display(dev)->mode_reg;
        struct nv04_crtc_reg *crtc_state = &state->crtc_reg[nv_crtc->index];
        struct nv04_mode_state *saved = &nv04_display(dev)->saved_reg;
        struct nv04_crtc_reg *crtc_saved = &saved->crtc_reg[nv_crtc->index];

        if (nv_two_heads(crtc->dev))
                NVSetOwner(crtc->dev, nv_crtc->index);

        nouveau_hw_save_state(crtc->dev, nv_crtc->index, saved);

        /* init some state to saved value */
        state->sel_clk = saved->sel_clk & ~(0x5 << 16);
        crtc_state->CRTC[NV_CIO_CRE_LCD__INDEX] = crtc_saved->CRTC[NV_CIO_CRE_LCD__INDEX];
        state->pllsel = saved->pllsel & ~(PLLSEL_VPLL1_MASK | PLLSEL_VPLL2_MASK | PLLSEL_TV_MASK);
        crtc_state->gpio_ext = crtc_saved->gpio_ext;
}

static void nv_crtc_restore(struct drm_crtc *crtc)
{
        struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc);
        struct drm_device *dev = crtc->dev;
        int head = nv_crtc->index;
        uint8_t saved_cr21 = nv04_display(dev)->saved_reg.crtc_reg[head].CRTC[NV_CIO_CRE_21];

        if (nv_two_heads(crtc->dev))
                NVSetOwner(crtc->dev, head);

        nouveau_hw_load_state(crtc->dev, head, &nv04_display(dev)->saved_reg);
        nv_lock_vga_crtc_shadow(crtc->dev, head, saved_cr21);

        nv_crtc->last_dpms = NV_DPMS_CLEARED;
}

static void nv_crtc_prepare(struct drm_crtc *crtc)
{
        struct drm_device *dev = crtc->dev;
        struct nouveau_drm *drm = nouveau_drm(dev);
        struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc);
        const struct drm_crtc_helper_funcs *funcs = crtc->helper_private;

        if (nv_two_heads(dev))
                NVSetOwner(dev, nv_crtc->index);

        drm_crtc_vblank_off(crtc);
        funcs->dpms(crtc, DRM_MODE_DPMS_OFF);

        NVBlankScreen(dev, nv_crtc->index, true);

        /* Some more preparation. */
        NVWriteCRTC(dev, nv_crtc->index, NV_PCRTC_CONFIG, NV_PCRTC_CONFIG_START_ADDRESS_NON_VGA);
        if (drm->client.device.info.family == NV_DEVICE_INFO_V0_CURIE) {
                uint32_t reg900 = NVReadRAMDAC(dev, nv_crtc->index, NV_PRAMDAC_900);
                NVWriteRAMDAC(dev, nv_crtc->index, NV_PRAMDAC_900, reg900 & ~0x10000);
        }
}

static void nv_crtc_commit(struct drm_crtc *crtc)
{
        struct drm_device *dev = crtc->dev;
        const struct drm_crtc_helper_funcs *funcs = crtc->helper_private;
        struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc);

        nouveau_hw_load_state(dev, nv_crtc->index, &nv04_display(dev)->mode_reg);
        nv04_crtc_mode_set_base(crtc, crtc->x, crtc->y, NULL);

#ifdef __BIG_ENDIAN
        /* turn on LFB swapping */
        {
                uint8_t tmp = NVReadVgaCrtc(dev, nv_crtc->index, NV_CIO_CRE_RCR);
                tmp |= MASK(NV_CIO_CRE_RCR_ENDIAN_BIG);
                NVWriteVgaCrtc(dev, nv_crtc->index, NV_CIO_CRE_RCR, tmp);
        }
#endif

        funcs->dpms(crtc, DRM_MODE_DPMS_ON);
        drm_crtc_vblank_on(crtc);
}

static void nv_crtc_destroy(struct drm_crtc *crtc)
{
        struct nv04_display *disp = nv04_display(crtc->dev);
        struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc);

        if (!nv_crtc)
                return;

        drm_crtc_cleanup(crtc);

        if (disp->image[nv_crtc->index])
                nouveau_bo_unpin(disp->image[nv_crtc->index]);
        nouveau_bo_ref(NULL, &disp->image[nv_crtc->index]);

        nouveau_bo_unmap(nv_crtc->cursor.nvbo);
        nouveau_bo_unpin(nv_crtc->cursor.nvbo);
        nouveau_bo_ref(NULL, &nv_crtc->cursor.nvbo);
        kfree(nv_crtc);
}

static void
nv_crtc_gamma_load(struct drm_crtc *crtc)
{
        struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc);
        struct drm_device *dev = nv_crtc->base.dev;
        struct rgb { uint8_t r, g, b; } __attribute__((packed)) *rgbs;
        u16 *r, *g, *b;
        int i;

        rgbs = (struct rgb *)nv04_display(dev)->mode_reg.crtc_reg[nv_crtc->index].DAC;
        r = crtc->gamma_store;
        g = r + crtc->gamma_size;
        b = g + crtc->gamma_size;

        for (i = 0; i < 256; i++) {
                rgbs[i].r = *r++ >> 8;
                rgbs[i].g = *g++ >> 8;
                rgbs[i].b = *b++ >> 8;
        }

        nouveau_hw_load_state_palette(dev, nv_crtc->index, &nv04_display(dev)->mode_reg);
}

static void
nv_crtc_disable(struct drm_crtc *crtc)
{
        struct nv04_display *disp = nv04_display(crtc->dev);
        struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc);
        if (disp->image[nv_crtc->index])
                nouveau_bo_unpin(disp->image[nv_crtc->index]);
        nouveau_bo_ref(NULL, &disp->image[nv_crtc->index]);
}

static int
nv_crtc_gamma_set(struct drm_crtc *crtc, u16 *r, u16 *g, u16 *b,
                  uint32_t size,
                  struct drm_modeset_acquire_ctx *ctx)
{
        struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc);

        /* We need to know the depth before we upload, but it's possible to
         * get called before a framebuffer is bound.  If this is the case,
         * mark the lut values as dirty by setting depth==0, and it'll be
         * uploaded on the first mode_set_base()
         */
        if (!nv_crtc->base.primary->fb) {
                nv_crtc->lut.depth = 0;
                return 0;
        }

        nv_crtc_gamma_load(crtc);

        return 0;
}

static int
nv04_crtc_do_mode_set_base(struct drm_crtc *crtc,
                           struct drm_framebuffer *passed_fb,
                           int x, int y, bool atomic)
{
        struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc);
        struct drm_device *dev = crtc->dev;
        struct nouveau_drm *drm = nouveau_drm(dev);
        struct nv04_crtc_reg *regp = &nv04_display(dev)->mode_reg.crtc_reg[nv_crtc->index];
        struct drm_framebuffer *drm_fb;
        struct nouveau_framebuffer *fb;
        int arb_burst, arb_lwm;

        NV_DEBUG(drm, "index %d\n", nv_crtc->index);

        /* no fb bound */
        if (!atomic && !crtc->primary->fb) {
                NV_DEBUG(drm, "No FB bound\n");
                return 0;
        }

        /* If atomic, we want to switch to the fb we were passed, so
         * now we update pointers to do that.
         */
        if (atomic) {
                drm_fb = passed_fb;
                fb = nouveau_framebuffer(passed_fb);
        } else {
                drm_fb = crtc->primary->fb;
                fb = nouveau_framebuffer(crtc->primary->fb);
        }

        nv_crtc->fb.offset = fb->nvbo->bo.offset;

        if (nv_crtc->lut.depth != drm_fb->format->depth) {
                nv_crtc->lut.depth = drm_fb->format->depth;
                nv_crtc_gamma_load(crtc);
        }

        /* Update the framebuffer format. */
        regp->CRTC[NV_CIO_CRE_PIXEL_INDEX] &= ~3;
        regp->CRTC[NV_CIO_CRE_PIXEL_INDEX] |= (drm_fb->format->depth + 1) / 8;
        regp->ramdac_gen_ctrl &= ~NV_PRAMDAC_GENERAL_CONTROL_ALT_MODE_SEL;
        if (drm_fb->format->depth == 16)
                regp->ramdac_gen_ctrl |= NV_PRAMDAC_GENERAL_CONTROL_ALT_MODE_SEL;
        crtc_wr_cio_state(crtc, regp, NV_CIO_CRE_PIXEL_INDEX);
        NVWriteRAMDAC(dev, nv_crtc->index, NV_PRAMDAC_GENERAL_CONTROL,
                      regp->ramdac_gen_ctrl);

        regp->CRTC[NV_CIO_CR_OFFSET_INDEX] = drm_fb->pitches[0] >> 3;
        regp->CRTC[NV_CIO_CRE_RPC0_INDEX] =
                XLATE(drm_fb->pitches[0] >> 3, 8, NV_CIO_CRE_RPC0_OFFSET_10_8);
        regp->CRTC[NV_CIO_CRE_42] =
                XLATE(drm_fb->pitches[0] / 8, 11, NV_CIO_CRE_42_OFFSET_11);
        crtc_wr_cio_state(crtc, regp, NV_CIO_CRE_RPC0_INDEX);
        crtc_wr_cio_state(crtc, regp, NV_CIO_CR_OFFSET_INDEX);
        crtc_wr_cio_state(crtc, regp, NV_CIO_CRE_42);

        /* Update the framebuffer location. */
        regp->fb_start = nv_crtc->fb.offset & ~3;
        regp->fb_start += (y * drm_fb->pitches[0]) + (x * drm_fb->format->cpp[0]);
        nv_set_crtc_base(dev, nv_crtc->index, regp->fb_start);

        /* Update the arbitration parameters. */
        nouveau_calc_arb(dev, crtc->mode.clock, drm_fb->format->cpp[0] * 8,
                         &arb_burst, &arb_lwm);

        regp->CRTC[NV_CIO_CRE_FF_INDEX] = arb_burst;
        regp->CRTC[NV_CIO_CRE_FFLWM__INDEX] = arb_lwm & 0xff;
        crtc_wr_cio_state(crtc, regp, NV_CIO_CRE_FF_INDEX);
        crtc_wr_cio_state(crtc, regp, NV_CIO_CRE_FFLWM__INDEX);

        if (drm->client.device.info.family >= NV_DEVICE_INFO_V0_KELVIN) {
                regp->CRTC[NV_CIO_CRE_47] = arb_lwm >> 8;
                crtc_wr_cio_state(crtc, regp, NV_CIO_CRE_47);
        }

        return 0;
}

static int
nv04_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
                        struct drm_framebuffer *old_fb)
{
        int ret = nv_crtc_swap_fbs(crtc, old_fb);
        if (ret)
                return ret;
        return nv04_crtc_do_mode_set_base(crtc, old_fb, x, y, false);
}

static int
nv04_crtc_mode_set_base_atomic(struct drm_crtc *crtc,
                               struct drm_framebuffer *fb,
                               int x, int y, enum mode_set_atomic state)
{
        struct nouveau_drm *drm = nouveau_drm(crtc->dev);
        struct drm_device *dev = drm->dev;

        if (state == ENTER_ATOMIC_MODE_SET)
                nouveau_fbcon_accel_save_disable(dev);
        else
                nouveau_fbcon_accel_restore(dev);

        return nv04_crtc_do_mode_set_base(crtc, fb, x, y, true);
}

static void nv04_cursor_upload(struct drm_device *dev, struct nouveau_bo *src,
                               struct nouveau_bo *dst)
{
        int width = nv_cursor_width(dev);
        uint32_t pixel;
        int i, j;

        for (i = 0; i < width; i++) {
                for (j = 0; j < width; j++) {
                        pixel = nouveau_bo_rd32(src, i*64 + j);

                        nouveau_bo_wr16(dst, i*width + j, (pixel & 0x80000000) >> 16
                                     | (pixel & 0xf80000) >> 9
                                     | (pixel & 0xf800) >> 6
                                     | (pixel & 0xf8) >> 3);
                }
        }
}

static void nv11_cursor_upload(struct drm_device *dev, struct nouveau_bo *src,
                               struct nouveau_bo *dst)
{
        uint32_t pixel;
        int alpha, i;

        /* nv11+ supports premultiplied (PM), or non-premultiplied (NPM) alpha
         * cursors (though NPM in combination with fp dithering may not work on
         * nv11, from "nv" driver history)
         * NPM mode needs NV_PCRTC_CURSOR_CONFIG_ALPHA_BLEND set and is what the
         * blob uses, however we get given PM cursors so we use PM mode
         */
        for (i = 0; i < 64 * 64; i++) {
                pixel = nouveau_bo_rd32(src, i);

                /* hw gets unhappy if alpha <= rgb values.  for a PM image "less
                 * than" shouldn't happen; fix "equal to" case by adding one to
                 * alpha channel (slightly inaccurate, but so is attempting to
                 * get back to NPM images, due to limits of integer precision)
                 */
                alpha = pixel >> 24;
                if (alpha > 0 && alpha < 255)
                        pixel = (pixel & 0x00ffffff) | ((alpha + 1) << 24);

#ifdef __BIG_ENDIAN
                {
                        struct nouveau_drm *drm = nouveau_drm(dev);

                        if (drm->client.device.info.chipset == 0x11) {
                                pixel = ((pixel & 0x000000ff) << 24) |
                                        ((pixel & 0x0000ff00) << 8) |
                                        ((pixel & 0x00ff0000) >> 8) |
                                        ((pixel & 0xff000000) >> 24);
                        }
                }
#endif

                nouveau_bo_wr32(dst, i, pixel);
        }
}

static int
nv04_crtc_cursor_set(struct drm_crtc *crtc, struct drm_file *file_priv,
                     uint32_t buffer_handle, uint32_t width, uint32_t height)
{
        struct nouveau_drm *drm = nouveau_drm(crtc->dev);
        struct drm_device *dev = drm->dev;
        struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc);
        struct nouveau_bo *cursor = NULL;
        struct drm_gem_object *gem;
        int ret = 0;

        if (!buffer_handle) {
                nv_crtc->cursor.hide(nv_crtc, true);
                return 0;
        }

        if (width != 64 || height != 64)
                return -EINVAL;

        gem = drm_gem_object_lookup(file_priv, buffer_handle);
        if (!gem)
                return -ENOENT;
        cursor = nouveau_gem_object(gem);

        ret = nouveau_bo_map(cursor);
        if (ret)
                goto out;

        if (drm->client.device.info.chipset >= 0x11)
                nv11_cursor_upload(dev, cursor, nv_crtc->cursor.nvbo);
        else
                nv04_cursor_upload(dev, cursor, nv_crtc->cursor.nvbo);

        nouveau_bo_unmap(cursor);
        nv_crtc->cursor.offset = nv_crtc->cursor.nvbo->bo.offset;
        nv_crtc->cursor.set_offset(nv_crtc, nv_crtc->cursor.offset);
        nv_crtc->cursor.show(nv_crtc, true);
out:
        drm_gem_object_unreference_unlocked(gem);
        return ret;
}

static int
nv04_crtc_cursor_move(struct drm_crtc *crtc, int x, int y)
{
        struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc);

        nv_crtc->cursor.set_pos(nv_crtc, x, y);
        return 0;
}

static int
nouveau_crtc_set_config(struct drm_mode_set *set,
                        struct drm_modeset_acquire_ctx *ctx)
{
        struct drm_device *dev;
        struct nouveau_drm *drm;
        int ret;
        struct drm_crtc *crtc;
        bool active = false;
        if (!set || !set->crtc)
                return -EINVAL;

        dev = set->crtc->dev;

        /* get a pm reference here */
        ret = pm_runtime_get_sync(dev->dev);
        if (ret < 0 && ret != -EACCES)
                return ret;

        ret = drm_crtc_helper_set_config(set, ctx);

        drm = nouveau_drm(dev);

        /* if we get here with no crtcs active then we can drop a reference */
        list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
                if (crtc->enabled)
                        active = true;
        }

        pm_runtime_mark_last_busy(dev->dev);
        /* if we have active crtcs and we don't have a power ref,
           take the current one */
        if (active && !drm->have_disp_power_ref) {
                drm->have_disp_power_ref = true;
                return ret;
        }
        /* if we have no active crtcs, then drop the power ref
           we got before */
        if (!active && drm->have_disp_power_ref) {
                pm_runtime_put_autosuspend(dev->dev);
                drm->have_disp_power_ref = false;
        }
        /* drop the power reference we got coming in here */
        pm_runtime_put_autosuspend(dev->dev);
        return ret;
}

static const struct drm_crtc_funcs nv04_crtc_funcs = {
        .cursor_set = nv04_crtc_cursor_set,
        .cursor_move = nv04_crtc_cursor_move,
        .gamma_set = nv_crtc_gamma_set,
        .set_config = nouveau_crtc_set_config,
        .page_flip = nouveau_crtc_page_flip,
        .destroy = nv_crtc_destroy,
};

static const struct drm_crtc_helper_funcs nv04_crtc_helper_funcs = {
        .dpms = nv_crtc_dpms,
        .prepare = nv_crtc_prepare,
        .commit = nv_crtc_commit,
        .mode_set = nv_crtc_mode_set,
        .mode_set_base = nv04_crtc_mode_set_base,
        .mode_set_base_atomic = nv04_crtc_mode_set_base_atomic,
        .disable = nv_crtc_disable,
};

static const uint32_t modeset_formats[] = {
        DRM_FORMAT_XRGB8888,
        DRM_FORMAT_RGB565,
        DRM_FORMAT_XRGB1555,
};

static struct drm_plane *
create_primary_plane(struct drm_device *dev)
{
        struct drm_plane *primary;
        int ret;

        primary = kzalloc(sizeof(*primary), GFP_KERNEL);
        if (primary == NULL) {
                DRM_DEBUG_KMS("Failed to allocate primary plane\n");
                return NULL;
        }

        /* possible_crtc's will be filled in later by crtc_init */
        ret = drm_universal_plane_init(dev, primary, 0,
                                       &drm_primary_helper_funcs,
                                       modeset_formats,
                                       ARRAY_SIZE(modeset_formats), NULL,
                                       DRM_PLANE_TYPE_PRIMARY, NULL);
        if (ret) {
                kfree(primary);
                primary = NULL;
        }

        return primary;
}

int
nv04_crtc_create(struct drm_device *dev, int crtc_num)
{
        struct nouveau_crtc *nv_crtc;
        int ret;

        nv_crtc = kzalloc(sizeof(*nv_crtc), GFP_KERNEL);
        if (!nv_crtc)
                return -ENOMEM;

        nv_crtc->lut.depth = 0;

        nv_crtc->index = crtc_num;
        nv_crtc->last_dpms = NV_DPMS_CLEARED;

        nv_crtc->save = nv_crtc_save;
        nv_crtc->restore = nv_crtc_restore;

        drm_crtc_init_with_planes(dev, &nv_crtc->base,
                                  create_primary_plane(dev), NULL,
                                  &nv04_crtc_funcs, NULL);
        drm_crtc_helper_add(&nv_crtc->base, &nv04_crtc_helper_funcs);
        drm_mode_crtc_set_gamma_size(&nv_crtc->base, 256);

        ret = nouveau_bo_new(&nouveau_drm(dev)->client, 64*64*4, 0x100,
                             TTM_PL_FLAG_VRAM, 0, 0x0000, NULL, NULL,
                             &nv_crtc->cursor.nvbo);
        if (!ret) {
                ret = nouveau_bo_pin(nv_crtc->cursor.nvbo, TTM_PL_FLAG_VRAM, false);
                if (!ret) {
                        ret = nouveau_bo_map(nv_crtc->cursor.nvbo);
                        if (ret)
                                nouveau_bo_unpin(nv_crtc->cursor.nvbo);
                }
                if (ret)
                        nouveau_bo_ref(NULL, &nv_crtc->cursor.nvbo);
        }

        nv04_cursor_init(nv_crtc);

        return 0;
}