1 | /* |
2 | * Copyright © 2013 Intel Corporation |
3 | * |
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: |
10 | * |
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 |
13 | * Software. |
14 | * |
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. |
22 | * |
23 | * Authors: |
24 | * Shobhit Kumar <shobhit.kumar@intel.com> |
25 | * Yogesh Mohan Marimuthu <yogesh.mohan.marimuthu@intel.com> |
26 | */ |
27 | |
28 | #include <linux/kernel.h> |
29 | #include "intel_drv.h" |
30 | #include "i915_drv.h" |
31 | #include "intel_dsi.h" |
32 | |
33 | #define DSI_HSS_PACKET_SIZE 4 |
34 | #define DSI_HSE_PACKET_SIZE 4 |
35 | #define 6 |
36 | #define 6 |
37 | #define 6 |
38 | #define 6 |
39 | #define DSI_EOTP_PACKET_SIZE 4 |
40 | |
41 | struct dsi_mnp { |
42 | u32 dsi_pll_ctrl; |
43 | u32 dsi_pll_div; |
44 | }; |
45 | |
46 | static const u32 lfsr_converts[] = { |
47 | 426, 469, 234, 373, 442, 221, 110, 311, 411, /* 62 - 70 */ |
48 | 461, 486, 243, 377, 188, 350, 175, 343, 427, 213, /* 71 - 80 */ |
49 | 106, 53, 282, 397, 354, 227, 113, 56, 284, 142, /* 81 - 90 */ |
50 | 71, 35 /* 91 - 92 */ |
51 | }; |
52 | |
53 | #ifdef DSI_CLK_FROM_RR |
54 | |
55 | static u32 dsi_rr_formula(const struct drm_display_mode *mode, |
56 | int pixel_format, int video_mode_format, |
57 | int lane_count, bool eotp) |
58 | { |
59 | u32 bpp; |
60 | u32 hactive, vactive, hfp, hsync, hbp, vfp, vsync, vbp; |
61 | u32 hsync_bytes, hbp_bytes, hactive_bytes, hfp_bytes; |
62 | u32 bytes_per_line, bytes_per_frame; |
63 | u32 num_frames; |
64 | u32 bytes_per_x_frames, bytes_per_x_frames_x_lanes; |
65 | u32 dsi_bit_clock_hz; |
66 | u32 dsi_clk; |
67 | |
68 | switch (pixel_format) { |
69 | default: |
70 | case VID_MODE_FORMAT_RGB888: |
71 | case VID_MODE_FORMAT_RGB666_LOOSE: |
72 | bpp = 24; |
73 | break; |
74 | case VID_MODE_FORMAT_RGB666: |
75 | bpp = 18; |
76 | break; |
77 | case VID_MODE_FORMAT_RGB565: |
78 | bpp = 16; |
79 | break; |
80 | } |
81 | |
82 | hactive = mode->hdisplay; |
83 | vactive = mode->vdisplay; |
84 | hfp = mode->hsync_start - mode->hdisplay; |
85 | hsync = mode->hsync_end - mode->hsync_start; |
86 | hbp = mode->htotal - mode->hsync_end; |
87 | |
88 | vfp = mode->vsync_start - mode->vdisplay; |
89 | vsync = mode->vsync_end - mode->vsync_start; |
90 | vbp = mode->vtotal - mode->vsync_end; |
91 | |
92 | hsync_bytes = DIV_ROUND_UP(hsync * bpp, 8); |
93 | hbp_bytes = DIV_ROUND_UP(hbp * bpp, 8); |
94 | hactive_bytes = DIV_ROUND_UP(hactive * bpp, 8); |
95 | hfp_bytes = DIV_ROUND_UP(hfp * bpp, 8); |
96 | |
97 | bytes_per_line = DSI_HSS_PACKET_SIZE + hsync_bytes + |
98 | DSI_HSA_PACKET_EXTRA_SIZE + DSI_HSE_PACKET_SIZE + |
99 | hbp_bytes + DSI_HBP_PACKET_EXTRA_SIZE + |
100 | hactive_bytes + DSI_HACTIVE_PACKET_EXTRA_SIZE + |
101 | hfp_bytes + DSI_HFP_PACKET_EXTRA_SIZE; |
102 | |
103 | /* |
104 | * XXX: Need to accurately calculate LP to HS transition timeout and add |
105 | * it to bytes_per_line/bytes_per_frame. |
106 | */ |
107 | |
108 | if (eotp && video_mode_format == VIDEO_MODE_BURST) |
109 | bytes_per_line += DSI_EOTP_PACKET_SIZE; |
110 | |
111 | bytes_per_frame = vsync * bytes_per_line + vbp * bytes_per_line + |
112 | vactive * bytes_per_line + vfp * bytes_per_line; |
113 | |
114 | if (eotp && |
115 | (video_mode_format == VIDEO_MODE_NON_BURST_WITH_SYNC_PULSE || |
116 | video_mode_format == VIDEO_MODE_NON_BURST_WITH_SYNC_EVENTS)) |
117 | bytes_per_frame += DSI_EOTP_PACKET_SIZE; |
118 | |
119 | num_frames = drm_mode_vrefresh(mode); |
120 | bytes_per_x_frames = num_frames * bytes_per_frame; |
121 | |
122 | bytes_per_x_frames_x_lanes = bytes_per_x_frames / lane_count; |
123 | |
124 | /* the dsi clock is divided by 2 in the hardware to get dsi ddr clock */ |
125 | dsi_bit_clock_hz = bytes_per_x_frames_x_lanes * 8; |
126 | dsi_clk = dsi_bit_clock_hz / 1000; |
127 | |
128 | if (eotp && video_mode_format == VIDEO_MODE_BURST) |
129 | dsi_clk *= 2; |
130 | |
131 | return dsi_clk; |
132 | } |
133 | |
134 | #else |
135 | |
136 | /* Get DSI clock from pixel clock */ |
137 | static u32 dsi_clk_from_pclk(const struct drm_display_mode *mode, |
138 | int pixel_format, int lane_count) |
139 | { |
140 | u32 dsi_clk_khz; |
141 | u32 bpp; |
142 | |
143 | switch (pixel_format) { |
144 | default: |
145 | case VID_MODE_FORMAT_RGB888: |
146 | case VID_MODE_FORMAT_RGB666_LOOSE: |
147 | bpp = 24; |
148 | break; |
149 | case VID_MODE_FORMAT_RGB666: |
150 | bpp = 18; |
151 | break; |
152 | case VID_MODE_FORMAT_RGB565: |
153 | bpp = 16; |
154 | break; |
155 | } |
156 | |
157 | /* DSI data rate = pixel clock * bits per pixel / lane count |
158 | pixel clock is converted from KHz to Hz */ |
159 | dsi_clk_khz = DIV_ROUND_CLOSEST(mode->clock * bpp, lane_count); |
160 | |
161 | return dsi_clk_khz; |
162 | } |
163 | |
164 | #endif |
165 | |
166 | static int dsi_calc_mnp(u32 dsi_clk, struct dsi_mnp *dsi_mnp) |
167 | { |
168 | u32 m, n, p; |
169 | u32 ref_clk; |
170 | u32 error; |
171 | u32 tmp_error; |
172 | int target_dsi_clk; |
173 | int calc_dsi_clk; |
174 | u32 calc_m; |
175 | u32 calc_p; |
176 | u32 m_seed; |
177 | |
178 | /* dsi_clk is expected in KHZ */ |
179 | if (dsi_clk < 300000 || dsi_clk > 1150000) { |
180 | DRM_ERROR("DSI CLK Out of Range\n" ); |
181 | return -ECHRNG; |
182 | } |
183 | |
184 | ref_clk = 25000; |
185 | target_dsi_clk = dsi_clk; |
186 | error = 0xFFFFFFFF; |
187 | tmp_error = 0xFFFFFFFF; |
188 | calc_m = 0; |
189 | calc_p = 0; |
190 | |
191 | for (m = 62; m <= 92; m++) { |
192 | for (p = 2; p <= 6; p++) { |
193 | /* Find the optimal m and p divisors |
194 | with minimal error +/- the required clock */ |
195 | calc_dsi_clk = (m * ref_clk) / p; |
196 | if (calc_dsi_clk == target_dsi_clk) { |
197 | calc_m = m; |
198 | calc_p = p; |
199 | error = 0; |
200 | break; |
201 | } else |
202 | tmp_error = abs(target_dsi_clk - calc_dsi_clk); |
203 | |
204 | if (tmp_error < error) { |
205 | error = tmp_error; |
206 | calc_m = m; |
207 | calc_p = p; |
208 | } |
209 | } |
210 | |
211 | if (error == 0) |
212 | break; |
213 | } |
214 | |
215 | m_seed = lfsr_converts[calc_m - 62]; |
216 | n = 1; |
217 | dsi_mnp->dsi_pll_ctrl = 1 << (DSI_PLL_P1_POST_DIV_SHIFT + calc_p - 2); |
218 | dsi_mnp->dsi_pll_div = (n - 1) << DSI_PLL_N1_DIV_SHIFT | |
219 | m_seed << DSI_PLL_M1_DIV_SHIFT; |
220 | |
221 | return 0; |
222 | } |
223 | |
224 | /* |
225 | * XXX: The muxing and gating is hard coded for now. Need to add support for |
226 | * sharing PLLs with two DSI outputs. |
227 | */ |
228 | static void vlv_configure_dsi_pll(struct intel_encoder *encoder) |
229 | { |
230 | struct drm_i915_private *dev_priv = encoder->base.dev->dev_private; |
231 | struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc); |
232 | const struct drm_display_mode *mode = &intel_crtc->config.adjusted_mode; |
233 | struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base); |
234 | int ret; |
235 | struct dsi_mnp dsi_mnp; |
236 | u32 dsi_clk; |
237 | |
238 | dsi_clk = dsi_clk_from_pclk(mode, intel_dsi->pixel_format, |
239 | intel_dsi->lane_count); |
240 | |
241 | ret = dsi_calc_mnp(dsi_clk, &dsi_mnp); |
242 | if (ret) { |
243 | DRM_DEBUG_KMS("dsi_calc_mnp failed\n" ); |
244 | return; |
245 | } |
246 | |
247 | dsi_mnp.dsi_pll_ctrl |= DSI_PLL_CLK_GATE_DSI0_DSIPLL; |
248 | |
249 | DRM_DEBUG_KMS("dsi pll div %08x, ctrl %08x\n" , |
250 | dsi_mnp.dsi_pll_div, dsi_mnp.dsi_pll_ctrl); |
251 | |
252 | vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_CONTROL, 0); |
253 | vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_DIVIDER, dsi_mnp.dsi_pll_div); |
254 | vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_CONTROL, dsi_mnp.dsi_pll_ctrl); |
255 | } |
256 | |
257 | void vlv_enable_dsi_pll(struct intel_encoder *encoder) |
258 | { |
259 | struct drm_i915_private *dev_priv = encoder->base.dev->dev_private; |
260 | u32 tmp; |
261 | |
262 | DRM_DEBUG_KMS("\n" ); |
263 | |
264 | mutex_lock(&dev_priv->dpio_lock); |
265 | |
266 | vlv_configure_dsi_pll(encoder); |
267 | |
268 | /* wait at least 0.5 us after ungating before enabling VCO */ |
269 | usleep_range(1, 10); |
270 | |
271 | tmp = vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_CONTROL); |
272 | tmp |= DSI_PLL_VCO_EN; |
273 | vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_CONTROL, tmp); |
274 | |
275 | mutex_unlock(&dev_priv->dpio_lock); |
276 | |
277 | if (wait_for(I915_READ(PIPECONF(PIPE_A)) & PIPECONF_DSI_PLL_LOCKED, 20)) { |
278 | DRM_ERROR("DSI PLL lock failed\n" ); |
279 | return; |
280 | } |
281 | |
282 | DRM_DEBUG_KMS("DSI PLL locked\n" ); |
283 | } |
284 | |
285 | void vlv_disable_dsi_pll(struct intel_encoder *encoder) |
286 | { |
287 | struct drm_i915_private *dev_priv = encoder->base.dev->dev_private; |
288 | u32 tmp; |
289 | |
290 | DRM_DEBUG_KMS("\n" ); |
291 | |
292 | mutex_lock(&dev_priv->dpio_lock); |
293 | |
294 | tmp = vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_CONTROL); |
295 | tmp &= ~DSI_PLL_VCO_EN; |
296 | tmp |= DSI_PLL_LDO_GATE; |
297 | vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_CONTROL, tmp); |
298 | |
299 | mutex_unlock(&dev_priv->dpio_lock); |
300 | } |
301 | |