drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_crtc.c

   1 /*
   2  * Copyright 2015 Freescale Semiconductor, Inc.
   3  *
   4  * Freescale DCU drm device driver
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  */
  11
  12 #include <linux/clk.h>
  13 #include <linux/regmap.h>
  14
  15 #include <drm/drmP.h>
  16 #include <drm/drm_atomic.h>
  17 #include <drm/drm_atomic_helper.h>
  18 #include <drm/drm_crtc.h>
  19 #include <drm/drm_crtc_helper.h>
  20
  21 #include "fsl_dcu_drm_crtc.h"
  22 #include "fsl_dcu_drm_drv.h"
  23 #include "fsl_dcu_drm_plane.h"
  24
  25 static void fsl_dcu_drm_crtc_atomic_flush(struct drm_crtc *crtc,
  26                                           struct drm_crtc_state *old_crtc_state)
  27 {
  28         struct drm_device *dev = crtc->dev;
  29         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
  30         struct drm_pending_vblank_event *event = crtc->state->event;
  31
  32         regmap_write(fsl_dev->regmap,
  33                      DCU_UPDATE_MODE, DCU_UPDATE_MODE_READREG);
  34
  35         if (event) {
  36                 crtc->state->event = NULL;
  37
  38                 spin_lock_irq(&crtc->dev->event_lock);
  39                 if (drm_crtc_vblank_get(crtc) == 0)
  40                         drm_crtc_arm_vblank_event(crtc, event);
  41                 else
  42                         drm_crtc_send_vblank_event(crtc, event);
  43                 spin_unlock_irq(&crtc->dev->event_lock);
  44         }
  45 }
  46
  47 static void fsl_dcu_drm_crtc_atomic_disable(struct drm_crtc *crtc,
  48                                         struct drm_crtc_state *old_crtc_state)
  49 {
  50         struct drm_device *dev = crtc->dev;
  51         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
  52
  53         /* always disable planes on the CRTC */
  54         drm_atomic_helper_disable_planes_on_crtc(old_crtc_state, true);
  55
  56         drm_crtc_vblank_off(crtc);
  57
  58         regmap_update_bits(fsl_dev->regmap, DCU_DCU_MODE,
  59                            DCU_MODE_DCU_MODE_MASK,
  60                            DCU_MODE_DCU_MODE(DCU_MODE_OFF));
  61         regmap_write(fsl_dev->regmap, DCU_UPDATE_MODE,
  62                      DCU_UPDATE_MODE_READREG);
  63         clk_disable_unprepare(fsl_dev->pix_clk);
  64 }
  65
  66 static void fsl_dcu_drm_crtc_enable(struct drm_crtc *crtc)
  67 {
  68         struct drm_device *dev = crtc->dev;
  69         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
  70
  71         clk_prepare_enable(fsl_dev->pix_clk);
  72         regmap_update_bits(fsl_dev->regmap, DCU_DCU_MODE,
  73                            DCU_MODE_DCU_MODE_MASK,
  74                            DCU_MODE_DCU_MODE(DCU_MODE_NORMAL));
  75         regmap_write(fsl_dev->regmap, DCU_UPDATE_MODE,
  76                      DCU_UPDATE_MODE_READREG);
  77
  78         drm_crtc_vblank_on(crtc);
  79 }
  80
  81 static void fsl_dcu_drm_crtc_mode_set_nofb(struct drm_crtc *crtc)
  82 {
  83         struct drm_device *dev = crtc->dev;
  84         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
  85         struct drm_connector *con = &fsl_dev->connector.base;
  86         struct drm_display_mode *mode = &crtc->state->mode;
  87         unsigned int hbp, hfp, hsw, vbp, vfp, vsw, index, pol = 0;
  88
  89         index = drm_crtc_index(crtc);
  90         clk_set_rate(fsl_dev->pix_clk, mode->clock * 1000);
  91
  92         /* Configure timings: */
  93         hbp = mode->htotal - mode->hsync_end;
  94         hfp = mode->hsync_start - mode->hdisplay;
  95         hsw = mode->hsync_end - mode->hsync_start;
  96         vbp = mode->vtotal - mode->vsync_end;
  97         vfp = mode->vsync_start - mode->vdisplay;
  98         vsw = mode->vsync_end - mode->vsync_start;
  99
 100         /* INV_PXCK as default (most display sample data on rising edge) */
 101         if (!(con->display_info.bus_flags & DRM_BUS_FLAG_PIXDATA_POSEDGE))
 102                 pol |= DCU_SYN_POL_INV_PXCK;
 103
 104         if (mode->flags & DRM_MODE_FLAG_NHSYNC)
 105                 pol |= DCU_SYN_POL_INV_HS_LOW;
 106
 107         if (mode->flags & DRM_MODE_FLAG_NVSYNC)
 108                 pol |= DCU_SYN_POL_INV_VS_LOW;
 109
 110         regmap_write(fsl_dev->regmap, DCU_HSYN_PARA,
 111                      DCU_HSYN_PARA_BP(hbp) |
 112                      DCU_HSYN_PARA_PW(hsw) |
 113                      DCU_HSYN_PARA_FP(hfp));
 114         regmap_write(fsl_dev->regmap, DCU_VSYN_PARA,
 115                      DCU_VSYN_PARA_BP(vbp) |
 116                      DCU_VSYN_PARA_PW(vsw) |
 117                      DCU_VSYN_PARA_FP(vfp));
 118         regmap_write(fsl_dev->regmap, DCU_DISP_SIZE,
 119                      DCU_DISP_SIZE_DELTA_Y(mode->vdisplay) |
 120                      DCU_DISP_SIZE_DELTA_X(mode->hdisplay));
 121         regmap_write(fsl_dev->regmap, DCU_SYN_POL, pol);
 122         regmap_write(fsl_dev->regmap, DCU_BGND, DCU_BGND_R(0) |
 123                      DCU_BGND_G(0) | DCU_BGND_B(0));
 124         regmap_write(fsl_dev->regmap, DCU_DCU_MODE,
 125                      DCU_MODE_BLEND_ITER(1) | DCU_MODE_RASTER_EN);
 126         regmap_write(fsl_dev->regmap, DCU_THRESHOLD,
 127                      DCU_THRESHOLD_LS_BF_VS(BF_VS_VAL) |
 128                      DCU_THRESHOLD_OUT_BUF_HIGH(BUF_MAX_VAL) |
 129                      DCU_THRESHOLD_OUT_BUF_LOW(BUF_MIN_VAL));
 130         return;
 131 }
 132
 133 static const struct drm_crtc_helper_funcs fsl_dcu_drm_crtc_helper_funcs = {
 134         .atomic_disable = fsl_dcu_drm_crtc_atomic_disable,
 135         .atomic_flush = fsl_dcu_drm_crtc_atomic_flush,
 136         .enable = fsl_dcu_drm_crtc_enable,
 137         .mode_set_nofb = fsl_dcu_drm_crtc_mode_set_nofb,
 138 };
 139
 140 static int fsl_dcu_drm_crtc_enable_vblank(struct drm_crtc *crtc)
 141 {
 142         struct drm_device *dev = crtc->dev;
 143         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 144         unsigned int value;
 145
 146         regmap_read(fsl_dev->regmap, DCU_INT_MASK, &value);
 147         value &= ~DCU_INT_MASK_VBLANK;
 148         regmap_write(fsl_dev->regmap, DCU_INT_MASK, value);
 149
 150         return 0;
 151 }
 152
 153 static void fsl_dcu_drm_crtc_disable_vblank(struct drm_crtc *crtc)
 154 {
 155         struct drm_device *dev = crtc->dev;
 156         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 157         unsigned int value;
 158
 159         regmap_read(fsl_dev->regmap, DCU_INT_MASK, &value);
 160         value |= DCU_INT_MASK_VBLANK;
 161         regmap_write(fsl_dev->regmap, DCU_INT_MASK, value);
 162 }
 163
 164 static const struct drm_crtc_funcs fsl_dcu_drm_crtc_funcs = {
 165         .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
 166         .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
 167         .destroy = drm_crtc_cleanup,
 168         .page_flip = drm_atomic_helper_page_flip,
 169         .reset = drm_atomic_helper_crtc_reset,
 170         .set_config = drm_atomic_helper_set_config,
 171         .enable_vblank = fsl_dcu_drm_crtc_enable_vblank,
 172         .disable_vblank = fsl_dcu_drm_crtc_disable_vblank,
 173 };
 174
 175 int fsl_dcu_drm_crtc_create(struct fsl_dcu_drm_device *fsl_dev)
 176 {
 177         struct drm_plane *primary;
 178         struct drm_crtc *crtc = &fsl_dev->crtc;
 179         int ret;
 180
 181         fsl_dcu_drm_init_planes(fsl_dev->drm);
 182
 183         primary = fsl_dcu_drm_primary_create_plane(fsl_dev->drm);
 184         if (!primary)
 185                 return -ENOMEM;
 186
 187         ret = drm_crtc_init_with_planes(fsl_dev->drm, crtc, primary, NULL,
 188                                         &fsl_dcu_drm_crtc_funcs, NULL);
 189         if (ret) {
 190                 primary->funcs->destroy(primary);
 191                 return ret;
 192         }
 193
 194         drm_crtc_helper_add(crtc, &fsl_dcu_drm_crtc_helper_funcs);
 195
 196         return 0;
 197 }