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 | * Author: Jani Nikula <jani.nikula@intel.com> |
24 | */ |
25 | |
26 | #include <linux/export.h> |
27 | #include <drm/drmP.h> |
28 | #include <drm/drm_crtc.h> |
29 | #include <video/mipi_display.h> |
30 | #include "i915_drv.h" |
31 | #include "intel_drv.h" |
32 | #include "intel_dsi.h" |
33 | #include "intel_dsi_cmd.h" |
34 | |
35 | /* |
36 | * XXX: MIPI_DATA_ADDRESS, MIPI_DATA_LENGTH, MIPI_COMMAND_LENGTH, and |
37 | * MIPI_COMMAND_ADDRESS registers. |
38 | * |
39 | * Apparently these registers provide a MIPI adapter level way to send (lots of) |
40 | * commands and data to the receiver, without having to write the commands and |
41 | * data to MIPI_{HS,LP}_GEN_{CTRL,DATA} registers word by word. |
42 | * |
43 | * Presumably for anything other than MIPI_DCS_WRITE_MEMORY_START and |
44 | * MIPI_DCS_WRITE_MEMORY_CONTINUE (which are used to update the external |
45 | * framebuffer in command mode displays) these are just an optimization that can |
46 | * come later. |
47 | * |
48 | * For memory writes, these should probably be used for performance. |
49 | */ |
50 | |
51 | static void print_stat(struct intel_dsi *intel_dsi) |
52 | { |
53 | struct drm_encoder *encoder = &intel_dsi->base.base; |
54 | struct drm_device *dev = encoder->dev; |
55 | struct drm_i915_private *dev_priv = dev->dev_private; |
56 | struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc); |
57 | enum i915_pipe pipe = intel_crtc->pipe; |
58 | u32 val; |
59 | |
60 | val = I915_READ(MIPI_INTR_STAT(pipe)); |
61 | |
62 | #define STAT_BIT(val, bit) (val) & (bit) ? " " #bit : "" |
63 | DRM_DEBUG_KMS("MIPI_INTR_STAT(%d) = %08x" |
64 | "%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s" |
65 | "\n" , pipe, val, |
66 | STAT_BIT(val, TEARING_EFFECT), |
67 | STAT_BIT(val, SPL_PKT_SENT_INTERRUPT), |
68 | STAT_BIT(val, GEN_READ_DATA_AVAIL), |
69 | STAT_BIT(val, LP_GENERIC_WR_FIFO_FULL), |
70 | STAT_BIT(val, HS_GENERIC_WR_FIFO_FULL), |
71 | STAT_BIT(val, RX_PROT_VIOLATION), |
72 | STAT_BIT(val, RX_INVALID_TX_LENGTH), |
73 | STAT_BIT(val, ACK_WITH_NO_ERROR), |
74 | STAT_BIT(val, TURN_AROUND_ACK_TIMEOUT), |
75 | STAT_BIT(val, LP_RX_TIMEOUT), |
76 | STAT_BIT(val, HS_TX_TIMEOUT), |
77 | STAT_BIT(val, DPI_FIFO_UNDERRUN), |
78 | STAT_BIT(val, LOW_CONTENTION), |
79 | STAT_BIT(val, HIGH_CONTENTION), |
80 | STAT_BIT(val, TXDSI_VC_ID_INVALID), |
81 | STAT_BIT(val, TXDSI_DATA_TYPE_NOT_RECOGNISED), |
82 | STAT_BIT(val, TXCHECKSUM_ERROR), |
83 | STAT_BIT(val, TXECC_MULTIBIT_ERROR), |
84 | STAT_BIT(val, TXECC_SINGLE_BIT_ERROR), |
85 | STAT_BIT(val, TXFALSE_CONTROL_ERROR), |
86 | STAT_BIT(val, RXDSI_VC_ID_INVALID), |
87 | STAT_BIT(val, RXDSI_DATA_TYPE_NOT_REGOGNISED), |
88 | STAT_BIT(val, RXCHECKSUM_ERROR), |
89 | STAT_BIT(val, RXECC_MULTIBIT_ERROR), |
90 | STAT_BIT(val, RXECC_SINGLE_BIT_ERROR), |
91 | STAT_BIT(val, RXFALSE_CONTROL_ERROR), |
92 | STAT_BIT(val, RXHS_RECEIVE_TIMEOUT_ERROR), |
93 | STAT_BIT(val, RX_LP_TX_SYNC_ERROR), |
94 | STAT_BIT(val, RXEXCAPE_MODE_ENTRY_ERROR), |
95 | STAT_BIT(val, RXEOT_SYNC_ERROR), |
96 | STAT_BIT(val, RXSOT_SYNC_ERROR), |
97 | STAT_BIT(val, RXSOT_ERROR)); |
98 | #undef STAT_BIT |
99 | } |
100 | |
101 | enum dsi_type { |
102 | DSI_DCS, |
103 | DSI_GENERIC, |
104 | }; |
105 | |
106 | /* enable or disable command mode hs transmissions */ |
107 | void dsi_hs_mode_enable(struct intel_dsi *intel_dsi, bool enable) |
108 | { |
109 | struct drm_encoder *encoder = &intel_dsi->base.base; |
110 | struct drm_device *dev = encoder->dev; |
111 | struct drm_i915_private *dev_priv = dev->dev_private; |
112 | struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc); |
113 | enum i915_pipe pipe = intel_crtc->pipe; |
114 | u32 temp; |
115 | u32 mask = DBI_FIFO_EMPTY; |
116 | |
117 | if (wait_for((I915_READ(MIPI_GEN_FIFO_STAT(pipe)) & mask) == mask, 50)) |
118 | DRM_ERROR("Timeout waiting for DBI FIFO empty\n" ); |
119 | |
120 | temp = I915_READ(MIPI_HS_LP_DBI_ENABLE(pipe)); |
121 | temp &= DBI_HS_LP_MODE_MASK; |
122 | I915_WRITE(MIPI_HS_LP_DBI_ENABLE(pipe), enable ? DBI_HS_MODE : DBI_LP_MODE); |
123 | |
124 | intel_dsi->hs = enable; |
125 | } |
126 | |
127 | static int dsi_vc_send_short(struct intel_dsi *intel_dsi, int channel, |
128 | u8 data_type, u16 data) |
129 | { |
130 | struct drm_encoder *encoder = &intel_dsi->base.base; |
131 | struct drm_device *dev = encoder->dev; |
132 | struct drm_i915_private *dev_priv = dev->dev_private; |
133 | struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc); |
134 | enum i915_pipe pipe = intel_crtc->pipe; |
135 | u32 ctrl_reg; |
136 | u32 ctrl; |
137 | u32 mask; |
138 | |
139 | DRM_DEBUG_KMS("channel %d, data_type %d, data %04x\n" , |
140 | channel, data_type, data); |
141 | |
142 | if (intel_dsi->hs) { |
143 | ctrl_reg = MIPI_HS_GEN_CTRL(pipe); |
144 | mask = HS_CTRL_FIFO_FULL; |
145 | } else { |
146 | ctrl_reg = MIPI_LP_GEN_CTRL(pipe); |
147 | mask = LP_CTRL_FIFO_FULL; |
148 | } |
149 | |
150 | if (wait_for((I915_READ(MIPI_GEN_FIFO_STAT(pipe)) & mask) == 0, 50)) { |
151 | DRM_ERROR("Timeout waiting for HS/LP CTRL FIFO !full\n" ); |
152 | print_stat(intel_dsi); |
153 | } |
154 | |
155 | /* |
156 | * Note: This function is also used for long packets, with length passed |
157 | * as data, since SHORT_PACKET_PARAM_SHIFT == |
158 | * LONG_PACKET_WORD_COUNT_SHIFT. |
159 | */ |
160 | ctrl = data << SHORT_PACKET_PARAM_SHIFT | |
161 | channel << VIRTUAL_CHANNEL_SHIFT | |
162 | data_type << DATA_TYPE_SHIFT; |
163 | |
164 | I915_WRITE(ctrl_reg, ctrl); |
165 | |
166 | return 0; |
167 | } |
168 | |
169 | static int dsi_vc_send_long(struct intel_dsi *intel_dsi, int channel, |
170 | u8 data_type, const u8 *data, int len) |
171 | { |
172 | struct drm_encoder *encoder = &intel_dsi->base.base; |
173 | struct drm_device *dev = encoder->dev; |
174 | struct drm_i915_private *dev_priv = dev->dev_private; |
175 | struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc); |
176 | enum i915_pipe pipe = intel_crtc->pipe; |
177 | u32 data_reg; |
178 | int i, j, n; |
179 | u32 mask; |
180 | |
181 | DRM_DEBUG_KMS("channel %d, data_type %d, len %04x\n" , |
182 | channel, data_type, len); |
183 | |
184 | if (intel_dsi->hs) { |
185 | data_reg = MIPI_HS_GEN_DATA(pipe); |
186 | mask = HS_DATA_FIFO_FULL; |
187 | } else { |
188 | data_reg = MIPI_LP_GEN_DATA(pipe); |
189 | mask = LP_DATA_FIFO_FULL; |
190 | } |
191 | |
192 | if (wait_for((I915_READ(MIPI_GEN_FIFO_STAT(pipe)) & mask) == 0, 50)) |
193 | DRM_ERROR("Timeout waiting for HS/LP DATA FIFO !full\n" ); |
194 | |
195 | for (i = 0; i < len; i += n) { |
196 | u32 val = 0; |
197 | n = min_t(int, len - i, 4); |
198 | |
199 | for (j = 0; j < n; j++) |
200 | val |= *data++ << 8 * j; |
201 | |
202 | I915_WRITE(data_reg, val); |
203 | /* XXX: check for data fifo full, once that is set, write 4 |
204 | * dwords, then wait for not set, then continue. */ |
205 | } |
206 | |
207 | return dsi_vc_send_short(intel_dsi, channel, data_type, len); |
208 | } |
209 | |
210 | static int dsi_vc_write_common(struct intel_dsi *intel_dsi, |
211 | int channel, const u8 *data, int len, |
212 | enum dsi_type type) |
213 | { |
214 | int ret; |
215 | |
216 | if (len == 0) { |
217 | BUG_ON(type == DSI_GENERIC); |
218 | ret = dsi_vc_send_short(intel_dsi, channel, |
219 | MIPI_DSI_GENERIC_SHORT_WRITE_0_PARAM, |
220 | 0); |
221 | } else if (len == 1) { |
222 | ret = dsi_vc_send_short(intel_dsi, channel, |
223 | type == DSI_GENERIC ? |
224 | MIPI_DSI_GENERIC_SHORT_WRITE_1_PARAM : |
225 | MIPI_DSI_DCS_SHORT_WRITE, data[0]); |
226 | } else if (len == 2) { |
227 | ret = dsi_vc_send_short(intel_dsi, channel, |
228 | type == DSI_GENERIC ? |
229 | MIPI_DSI_GENERIC_SHORT_WRITE_2_PARAM : |
230 | MIPI_DSI_DCS_SHORT_WRITE_PARAM, |
231 | (data[1] << 8) | data[0]); |
232 | } else { |
233 | ret = dsi_vc_send_long(intel_dsi, channel, |
234 | type == DSI_GENERIC ? |
235 | MIPI_DSI_GENERIC_LONG_WRITE : |
236 | MIPI_DSI_DCS_LONG_WRITE, data, len); |
237 | } |
238 | |
239 | return ret; |
240 | } |
241 | |
242 | int dsi_vc_dcs_write(struct intel_dsi *intel_dsi, int channel, |
243 | const u8 *data, int len) |
244 | { |
245 | return dsi_vc_write_common(intel_dsi, channel, data, len, DSI_DCS); |
246 | } |
247 | |
248 | int dsi_vc_generic_write(struct intel_dsi *intel_dsi, int channel, |
249 | const u8 *data, int len) |
250 | { |
251 | return dsi_vc_write_common(intel_dsi, channel, data, len, DSI_GENERIC); |
252 | } |
253 | |
254 | static int dsi_vc_dcs_send_read_request(struct intel_dsi *intel_dsi, |
255 | int channel, u8 dcs_cmd) |
256 | { |
257 | return dsi_vc_send_short(intel_dsi, channel, MIPI_DSI_DCS_READ, |
258 | dcs_cmd); |
259 | } |
260 | |
261 | static int dsi_vc_generic_send_read_request(struct intel_dsi *intel_dsi, |
262 | int channel, u8 *reqdata, |
263 | int reqlen) |
264 | { |
265 | u16 data; |
266 | u8 data_type; |
267 | |
268 | switch (reqlen) { |
269 | case 0: |
270 | data_type = MIPI_DSI_GENERIC_READ_REQUEST_0_PARAM; |
271 | data = 0; |
272 | break; |
273 | case 1: |
274 | data_type = MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM; |
275 | data = reqdata[0]; |
276 | break; |
277 | case 2: |
278 | data_type = MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM; |
279 | data = (reqdata[1] << 8) | reqdata[0]; |
280 | break; |
281 | default: |
282 | BUG(); |
283 | } |
284 | |
285 | return dsi_vc_send_short(intel_dsi, channel, data_type, data); |
286 | } |
287 | |
288 | static int dsi_read_data_return(struct intel_dsi *intel_dsi, |
289 | u8 *buf, int buflen) |
290 | { |
291 | struct drm_encoder *encoder = &intel_dsi->base.base; |
292 | struct drm_device *dev = encoder->dev; |
293 | struct drm_i915_private *dev_priv = dev->dev_private; |
294 | struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc); |
295 | enum i915_pipe pipe = intel_crtc->pipe; |
296 | int i, len = 0; |
297 | u32 data_reg, val; |
298 | |
299 | if (intel_dsi->hs) { |
300 | data_reg = MIPI_HS_GEN_DATA(pipe); |
301 | } else { |
302 | data_reg = MIPI_LP_GEN_DATA(pipe); |
303 | } |
304 | |
305 | while (len < buflen) { |
306 | val = I915_READ(data_reg); |
307 | for (i = 0; i < 4 && len < buflen; i++, len++) |
308 | buf[len] = val >> 8 * i; |
309 | } |
310 | |
311 | return len; |
312 | } |
313 | |
314 | int dsi_vc_dcs_read(struct intel_dsi *intel_dsi, int channel, u8 dcs_cmd, |
315 | u8 *buf, int buflen) |
316 | { |
317 | struct drm_encoder *encoder = &intel_dsi->base.base; |
318 | struct drm_device *dev = encoder->dev; |
319 | struct drm_i915_private *dev_priv = dev->dev_private; |
320 | struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc); |
321 | enum i915_pipe pipe = intel_crtc->pipe; |
322 | u32 mask; |
323 | int ret; |
324 | |
325 | /* |
326 | * XXX: should issue multiple read requests and reads if request is |
327 | * longer than MIPI_MAX_RETURN_PKT_SIZE |
328 | */ |
329 | |
330 | I915_WRITE(MIPI_INTR_STAT(pipe), GEN_READ_DATA_AVAIL); |
331 | |
332 | ret = dsi_vc_dcs_send_read_request(intel_dsi, channel, dcs_cmd); |
333 | if (ret) |
334 | return ret; |
335 | |
336 | mask = GEN_READ_DATA_AVAIL; |
337 | if (wait_for((I915_READ(MIPI_INTR_STAT(pipe)) & mask) == mask, 50)) |
338 | DRM_ERROR("Timeout waiting for read data.\n" ); |
339 | |
340 | ret = dsi_read_data_return(intel_dsi, buf, buflen); |
341 | if (ret < 0) |
342 | return ret; |
343 | |
344 | if (ret != buflen) |
345 | return -EIO; |
346 | |
347 | return 0; |
348 | } |
349 | |
350 | int dsi_vc_generic_read(struct intel_dsi *intel_dsi, int channel, |
351 | u8 *reqdata, int reqlen, u8 *buf, int buflen) |
352 | { |
353 | struct drm_encoder *encoder = &intel_dsi->base.base; |
354 | struct drm_device *dev = encoder->dev; |
355 | struct drm_i915_private *dev_priv = dev->dev_private; |
356 | struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc); |
357 | enum i915_pipe pipe = intel_crtc->pipe; |
358 | u32 mask; |
359 | int ret; |
360 | |
361 | /* |
362 | * XXX: should issue multiple read requests and reads if request is |
363 | * longer than MIPI_MAX_RETURN_PKT_SIZE |
364 | */ |
365 | |
366 | I915_WRITE(MIPI_INTR_STAT(pipe), GEN_READ_DATA_AVAIL); |
367 | |
368 | ret = dsi_vc_generic_send_read_request(intel_dsi, channel, reqdata, |
369 | reqlen); |
370 | if (ret) |
371 | return ret; |
372 | |
373 | mask = GEN_READ_DATA_AVAIL; |
374 | if (wait_for((I915_READ(MIPI_INTR_STAT(pipe)) & mask) == mask, 50)) |
375 | DRM_ERROR("Timeout waiting for read data.\n" ); |
376 | |
377 | ret = dsi_read_data_return(intel_dsi, buf, buflen); |
378 | if (ret < 0) |
379 | return ret; |
380 | |
381 | if (ret != buflen) |
382 | return -EIO; |
383 | |
384 | return 0; |
385 | } |
386 | |
387 | /* |
388 | * send a video mode command |
389 | * |
390 | * XXX: commands with data in MIPI_DPI_DATA? |
391 | */ |
392 | int dpi_send_cmd(struct intel_dsi *intel_dsi, u32 cmd) |
393 | { |
394 | struct drm_encoder *encoder = &intel_dsi->base.base; |
395 | struct drm_device *dev = encoder->dev; |
396 | struct drm_i915_private *dev_priv = dev->dev_private; |
397 | struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc); |
398 | enum i915_pipe pipe = intel_crtc->pipe; |
399 | u32 mask; |
400 | |
401 | /* XXX: pipe, hs */ |
402 | if (intel_dsi->hs) |
403 | cmd &= ~DPI_LP_MODE; |
404 | else |
405 | cmd |= DPI_LP_MODE; |
406 | |
407 | /* DPI virtual channel?! */ |
408 | |
409 | mask = DPI_FIFO_EMPTY; |
410 | if (wait_for((I915_READ(MIPI_GEN_FIFO_STAT(pipe)) & mask) == mask, 50)) |
411 | DRM_ERROR("Timeout waiting for DPI FIFO empty.\n" ); |
412 | |
413 | /* clear bit */ |
414 | I915_WRITE(MIPI_INTR_STAT(pipe), SPL_PKT_SENT_INTERRUPT); |
415 | |
416 | /* XXX: old code skips write if control unchanged */ |
417 | if (cmd == I915_READ(MIPI_DPI_CONTROL(pipe))) |
418 | DRM_ERROR("Same special packet %02x twice in a row.\n" , cmd); |
419 | |
420 | I915_WRITE(MIPI_DPI_CONTROL(pipe), cmd); |
421 | |
422 | mask = SPL_PKT_SENT_INTERRUPT; |
423 | if (wait_for((I915_READ(MIPI_INTR_STAT(pipe)) & mask) == mask, 100)) |
424 | DRM_ERROR("Video mode command 0x%08x send failed.\n" , cmd); |
425 | |
426 | return 0; |
427 | } |
428 | |