2 * Copyright © 2013 Intel Corporation
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
24 * Shobhit Kumar <shobhit.kumar@intel.com>
25 * Yogesh Mohan Marimuthu <yogesh.mohan.marimuthu@intel.com>
28 #include <linux/kernel.h>
29 #include "intel_drv.h"
31 #include "intel_dsi.h"
33 #define DSI_HSS_PACKET_SIZE 4
34 #define DSI_HSE_PACKET_SIZE 4
35 #define DSI_HSA_PACKET_EXTRA_SIZE 6
36 #define DSI_HBP_PACKET_EXTRA_SIZE 6
37 #define DSI_HACTIVE_PACKET_EXTRA_SIZE 6
38 #define DSI_HFP_PACKET_EXTRA_SIZE 6
39 #define DSI_EOTP_PACKET_SIZE 4
41 static int dsi_pixel_format_bpp(int pixel_format
)
45 switch (pixel_format
) {
47 case VID_MODE_FORMAT_RGB888
:
48 case VID_MODE_FORMAT_RGB666_LOOSE
:
51 case VID_MODE_FORMAT_RGB666
:
54 case VID_MODE_FORMAT_RGB565
:
67 static const u32 lfsr_converts
[] = {
68 426, 469, 234, 373, 442, 221, 110, 311, 411, /* 62 - 70 */
69 461, 486, 243, 377, 188, 350, 175, 343, 427, 213, /* 71 - 80 */
70 106, 53, 282, 397, 454, 227, 113, 56, 284, 142, /* 81 - 90 */
71 71, 35, 273, 136, 324, 418, 465, 488, 500, 506 /* 91 - 100 */
74 #ifdef DSI_CLK_FROM_RR
76 static u32
dsi_rr_formula(const struct drm_display_mode
*mode
,
77 int pixel_format
, int video_mode_format
,
78 int lane_count
, bool eotp
)
81 u32 hactive
, vactive
, hfp
, hsync
, hbp
, vfp
, vsync
, vbp
;
82 u32 hsync_bytes
, hbp_bytes
, hactive_bytes
, hfp_bytes
;
83 u32 bytes_per_line
, bytes_per_frame
;
85 u32 bytes_per_x_frames
, bytes_per_x_frames_x_lanes
;
89 bpp
= dsi_pixel_format_bpp(pixel_format
);
91 hactive
= mode
->hdisplay
;
92 vactive
= mode
->vdisplay
;
93 hfp
= mode
->hsync_start
- mode
->hdisplay
;
94 hsync
= mode
->hsync_end
- mode
->hsync_start
;
95 hbp
= mode
->htotal
- mode
->hsync_end
;
97 vfp
= mode
->vsync_start
- mode
->vdisplay
;
98 vsync
= mode
->vsync_end
- mode
->vsync_start
;
99 vbp
= mode
->vtotal
- mode
->vsync_end
;
101 hsync_bytes
= DIV_ROUND_UP(hsync
* bpp
, 8);
102 hbp_bytes
= DIV_ROUND_UP(hbp
* bpp
, 8);
103 hactive_bytes
= DIV_ROUND_UP(hactive
* bpp
, 8);
104 hfp_bytes
= DIV_ROUND_UP(hfp
* bpp
, 8);
106 bytes_per_line
= DSI_HSS_PACKET_SIZE
+ hsync_bytes
+
107 DSI_HSA_PACKET_EXTRA_SIZE
+ DSI_HSE_PACKET_SIZE
+
108 hbp_bytes
+ DSI_HBP_PACKET_EXTRA_SIZE
+
109 hactive_bytes
+ DSI_HACTIVE_PACKET_EXTRA_SIZE
+
110 hfp_bytes
+ DSI_HFP_PACKET_EXTRA_SIZE
;
113 * XXX: Need to accurately calculate LP to HS transition timeout and add
114 * it to bytes_per_line/bytes_per_frame.
117 if (eotp
&& video_mode_format
== VIDEO_MODE_BURST
)
118 bytes_per_line
+= DSI_EOTP_PACKET_SIZE
;
120 bytes_per_frame
= vsync
* bytes_per_line
+ vbp
* bytes_per_line
+
121 vactive
* bytes_per_line
+ vfp
* bytes_per_line
;
124 (video_mode_format
== VIDEO_MODE_NON_BURST_WITH_SYNC_PULSE
||
125 video_mode_format
== VIDEO_MODE_NON_BURST_WITH_SYNC_EVENTS
))
126 bytes_per_frame
+= DSI_EOTP_PACKET_SIZE
;
128 num_frames
= drm_mode_vrefresh(mode
);
129 bytes_per_x_frames
= num_frames
* bytes_per_frame
;
131 bytes_per_x_frames_x_lanes
= bytes_per_x_frames
/ lane_count
;
133 /* the dsi clock is divided by 2 in the hardware to get dsi ddr clock */
134 dsi_bit_clock_hz
= bytes_per_x_frames_x_lanes
* 8;
135 dsi_clk
= dsi_bit_clock_hz
/ 1000;
137 if (eotp
&& video_mode_format
== VIDEO_MODE_BURST
)
145 /* Get DSI clock from pixel clock */
146 static u32
dsi_clk_from_pclk(u32 pclk
, int pixel_format
, int lane_count
)
149 u32 bpp
= dsi_pixel_format_bpp(pixel_format
);
151 /* DSI data rate = pixel clock * bits per pixel / lane count
152 pixel clock is converted from KHz to Hz */
153 dsi_clk_khz
= DIV_ROUND_CLOSEST(pclk
* bpp
, lane_count
);
160 static int dsi_calc_mnp(struct drm_i915_private
*dev_priv
,
161 struct dsi_mnp
*dsi_mnp
, int target_dsi_clk
)
163 unsigned int calc_m
= 0, calc_p
= 0;
164 unsigned int m_min
, m_max
, p_min
= 2, p_max
= 6;
165 unsigned int m
, n
, p
;
167 int delta
= target_dsi_clk
;
170 /* target_dsi_clk is expected in kHz */
171 if (target_dsi_clk
< 300000 || target_dsi_clk
> 1150000) {
172 DRM_ERROR("DSI CLK Out of Range\n");
176 if (IS_CHERRYVIEW(dev_priv
)) {
188 for (m
= m_min
; m
<= m_max
&& delta
; m
++) {
189 for (p
= p_min
; p
<= p_max
&& delta
; p
++) {
191 * Find the optimal m and p divisors with minimal delta
192 * +/- the required clock
194 int calc_dsi_clk
= (m
* ref_clk
) / (p
* n
);
195 int d
= abs(target_dsi_clk
- calc_dsi_clk
);
204 /* register has log2(N1), this works fine for powers of two */
206 m_seed
= lfsr_converts
[calc_m
- 62];
207 dsi_mnp
->dsi_pll_ctrl
= 1 << (DSI_PLL_P1_POST_DIV_SHIFT
+ calc_p
- 2);
208 dsi_mnp
->dsi_pll_div
= n
<< DSI_PLL_N1_DIV_SHIFT
|
209 m_seed
<< DSI_PLL_M1_DIV_SHIFT
;
215 * XXX: The muxing and gating is hard coded for now. Need to add support for
216 * sharing PLLs with two DSI outputs.
218 static void vlv_configure_dsi_pll(struct intel_encoder
*encoder
)
220 struct drm_i915_private
*dev_priv
= encoder
->base
.dev
->dev_private
;
221 struct intel_dsi
*intel_dsi
= enc_to_intel_dsi(&encoder
->base
);
223 struct dsi_mnp dsi_mnp
;
226 dsi_clk
= dsi_clk_from_pclk(intel_dsi
->pclk
, intel_dsi
->pixel_format
,
227 intel_dsi
->lane_count
);
229 ret
= dsi_calc_mnp(dev_priv
, &dsi_mnp
, dsi_clk
);
231 DRM_DEBUG_KMS("dsi_calc_mnp failed\n");
235 if (intel_dsi
->ports
& (1 << PORT_A
))
236 dsi_mnp
.dsi_pll_ctrl
|= DSI_PLL_CLK_GATE_DSI0_DSIPLL
;
238 if (intel_dsi
->ports
& (1 << PORT_C
))
239 dsi_mnp
.dsi_pll_ctrl
|= DSI_PLL_CLK_GATE_DSI1_DSIPLL
;
241 DRM_DEBUG_KMS("dsi pll div %08x, ctrl %08x\n",
242 dsi_mnp
.dsi_pll_div
, dsi_mnp
.dsi_pll_ctrl
);
244 vlv_cck_write(dev_priv
, CCK_REG_DSI_PLL_CONTROL
, 0);
245 vlv_cck_write(dev_priv
, CCK_REG_DSI_PLL_DIVIDER
, dsi_mnp
.dsi_pll_div
);
246 vlv_cck_write(dev_priv
, CCK_REG_DSI_PLL_CONTROL
, dsi_mnp
.dsi_pll_ctrl
);
249 static void vlv_enable_dsi_pll(struct intel_encoder
*encoder
)
251 struct drm_i915_private
*dev_priv
= encoder
->base
.dev
->dev_private
;
256 mutex_lock(&dev_priv
->sb_lock
);
258 vlv_configure_dsi_pll(encoder
);
260 /* wait at least 0.5 us after ungating before enabling VCO */
263 tmp
= vlv_cck_read(dev_priv
, CCK_REG_DSI_PLL_CONTROL
);
264 tmp
|= DSI_PLL_VCO_EN
;
265 vlv_cck_write(dev_priv
, CCK_REG_DSI_PLL_CONTROL
, tmp
);
267 if (wait_for(vlv_cck_read(dev_priv
, CCK_REG_DSI_PLL_CONTROL
) &
270 mutex_unlock(&dev_priv
->sb_lock
);
271 DRM_ERROR("DSI PLL lock failed\n");
274 mutex_unlock(&dev_priv
->sb_lock
);
276 DRM_DEBUG_KMS("DSI PLL locked\n");
279 void vlv_disable_dsi_pll(struct intel_encoder
*encoder
)
281 struct drm_i915_private
*dev_priv
= encoder
->base
.dev
->dev_private
;
286 mutex_lock(&dev_priv
->sb_lock
);
288 tmp
= vlv_cck_read(dev_priv
, CCK_REG_DSI_PLL_CONTROL
);
289 tmp
&= ~DSI_PLL_VCO_EN
;
290 tmp
|= DSI_PLL_LDO_GATE
;
291 vlv_cck_write(dev_priv
, CCK_REG_DSI_PLL_CONTROL
, tmp
);
293 mutex_unlock(&dev_priv
->sb_lock
);
296 static void assert_bpp_mismatch(int pixel_format
, int pipe_bpp
)
298 int bpp
= dsi_pixel_format_bpp(pixel_format
);
300 WARN(bpp
!= pipe_bpp
,
301 "bpp match assertion failure (expected %d, current %d)\n",
305 u32
vlv_get_dsi_pclk(struct intel_encoder
*encoder
, int pipe_bpp
)
307 struct drm_i915_private
*dev_priv
= encoder
->base
.dev
->dev_private
;
308 struct intel_dsi
*intel_dsi
= enc_to_intel_dsi(&encoder
->base
);
310 u32 pll_ctl
, pll_div
;
317 mutex_lock(&dev_priv
->sb_lock
);
318 pll_ctl
= vlv_cck_read(dev_priv
, CCK_REG_DSI_PLL_CONTROL
);
319 pll_div
= vlv_cck_read(dev_priv
, CCK_REG_DSI_PLL_DIVIDER
);
320 mutex_unlock(&dev_priv
->sb_lock
);
322 /* mask out other bits and extract the P1 divisor */
323 pll_ctl
&= DSI_PLL_P1_POST_DIV_MASK
;
324 pll_ctl
= pll_ctl
>> (DSI_PLL_P1_POST_DIV_SHIFT
- 2);
327 n
= (pll_div
& DSI_PLL_N1_DIV_MASK
) >> DSI_PLL_N1_DIV_SHIFT
;
328 n
= 1 << n
; /* register has log2(N1) */
330 /* mask out the other bits and extract the M1 divisor */
331 pll_div
&= DSI_PLL_M1_DIV_MASK
;
332 pll_div
= pll_div
>> DSI_PLL_M1_DIV_SHIFT
;
335 pll_ctl
= pll_ctl
>> 1;
341 DRM_ERROR("wrong P1 divisor\n");
345 for (i
= 0; i
< ARRAY_SIZE(lfsr_converts
); i
++) {
346 if (lfsr_converts
[i
] == pll_div
)
350 if (i
== ARRAY_SIZE(lfsr_converts
)) {
351 DRM_ERROR("wrong m_seed programmed\n");
357 dsi_clock
= (m
* refclk
) / (p
* n
);
359 /* pixel_format and pipe_bpp should agree */
360 assert_bpp_mismatch(intel_dsi
->pixel_format
, pipe_bpp
);
362 pclk
= DIV_ROUND_CLOSEST(dsi_clock
* intel_dsi
->lane_count
, pipe_bpp
);
367 static bool bxt_configure_dsi_pll(struct intel_encoder
*encoder
)
369 struct drm_i915_private
*dev_priv
= encoder
->base
.dev
->dev_private
;
370 struct intel_dsi
*intel_dsi
= enc_to_intel_dsi(&encoder
->base
);
375 dsi_clk
= dsi_clk_from_pclk(intel_dsi
->pclk
, intel_dsi
->pixel_format
,
376 intel_dsi
->lane_count
);
379 * From clock diagram, to get PLL ratio divider, divide double of DSI
380 * link rate (i.e., 2*8x=16x frequency value) by ref clock. Make sure to
381 * round 'up' the result
383 dsi_ratio
= DIV_ROUND_UP(dsi_clk
* 2, BXT_REF_CLOCK_KHZ
);
384 if (dsi_ratio
< BXT_DSI_PLL_RATIO_MIN
||
385 dsi_ratio
> BXT_DSI_PLL_RATIO_MAX
) {
386 DRM_ERROR("Cant get a suitable ratio from DSI PLL ratios\n");
391 * Program DSI ratio and Select MIPIC and MIPIA PLL output as 8x
392 * Spec says both have to be programmed, even if one is not getting
393 * used. Configure MIPI_CLOCK_CTL dividers in modeset
395 val
= I915_READ(BXT_DSI_PLL_CTL
);
396 val
&= ~BXT_DSI_PLL_PVD_RATIO_MASK
;
397 val
&= ~BXT_DSI_FREQ_SEL_MASK
;
398 val
&= ~BXT_DSI_PLL_RATIO_MASK
;
399 val
|= (dsi_ratio
| BXT_DSIA_16X_BY2
| BXT_DSIC_16X_BY2
);
401 /* As per recommendation from hardware team,
402 * Prog PVD ratio =1 if dsi ratio <= 50
404 if (dsi_ratio
<= 50) {
405 val
&= ~BXT_DSI_PLL_PVD_RATIO_MASK
;
406 val
|= BXT_DSI_PLL_PVD_RATIO_1
;
409 I915_WRITE(BXT_DSI_PLL_CTL
, val
);
410 POSTING_READ(BXT_DSI_PLL_CTL
);
415 static void bxt_enable_dsi_pll(struct intel_encoder
*encoder
)
417 struct drm_i915_private
*dev_priv
= encoder
->base
.dev
->dev_private
;
422 val
= I915_READ(BXT_DSI_PLL_ENABLE
);
424 if (val
& BXT_DSI_PLL_DO_ENABLE
) {
425 WARN(1, "DSI PLL already enabled. Disabling it.\n");
426 val
&= ~BXT_DSI_PLL_DO_ENABLE
;
427 I915_WRITE(BXT_DSI_PLL_ENABLE
, val
);
430 /* Configure PLL vales */
431 if (!bxt_configure_dsi_pll(encoder
)) {
432 DRM_ERROR("Configure DSI PLL failed, abort PLL enable\n");
437 val
= I915_READ(BXT_DSI_PLL_ENABLE
);
438 val
|= BXT_DSI_PLL_DO_ENABLE
;
439 I915_WRITE(BXT_DSI_PLL_ENABLE
, val
);
441 /* Timeout and fail if PLL not locked */
442 if (wait_for(I915_READ(BXT_DSI_PLL_ENABLE
) & BXT_DSI_PLL_LOCKED
, 1)) {
443 DRM_ERROR("Timed out waiting for DSI PLL to lock\n");
447 DRM_DEBUG_KMS("DSI PLL locked\n");
450 void intel_enable_dsi_pll(struct intel_encoder
*encoder
)
452 struct drm_device
*dev
= encoder
->base
.dev
;
454 if (IS_VALLEYVIEW(dev
))
455 vlv_enable_dsi_pll(encoder
);
456 else if (IS_BROXTON(dev
))
457 bxt_enable_dsi_pll(encoder
);