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authorMa Ling <ling.ma@intel.com>2009-05-25 23:31:00 -0400
committerEric Anholt <eric@anholt.net>2009-05-26 13:34:47 -0400
commite4a5d54f924ea5ce2913d9d0687d034004816465 (patch)
treed9b993eac81a8667cc1591f16ba884e1fd549a07 /drivers/gpu
parent619ac3b75a1e9b2df66857f6a0fb466f1da5fa9e (diff)
drm/i915: Add support for VGA load detection (pre-945).
Two approaches for VGA detections: hot plug detection for 945G onwards and load pipe detection for Pre-945G. Load pipe detection will get one free pipe, set border color as red and blue, then check CRT status by swf register. This is a sync-up with the 2D driver. Signed-off-by: Ma Ling <ling.ma@intel.com> Signed-off-by: Eric Anholt <eric@anholt.net>
Diffstat (limited to 'drivers/gpu')
-rw-r--r--drivers/gpu/drm/i915/intel_crt.c149
1 files changed, 147 insertions, 2 deletions
diff --git a/drivers/gpu/drm/i915/intel_crt.c b/drivers/gpu/drm/i915/intel_crt.c
index 19148c3df637..640f5158effc 100644
--- a/drivers/gpu/drm/i915/intel_crt.c
+++ b/drivers/gpu/drm/i915/intel_crt.c
@@ -198,9 +198,142 @@ static bool intel_crt_detect_ddc(struct drm_connector *connector)
198 return intel_ddc_probe(intel_output); 198 return intel_ddc_probe(intel_output);
199} 199}
200 200
201static enum drm_connector_status
202intel_crt_load_detect(struct drm_crtc *crtc, struct intel_output *intel_output)
203{
204 struct drm_encoder *encoder = &intel_output->enc;
205 struct drm_device *dev = encoder->dev;
206 struct drm_i915_private *dev_priv = dev->dev_private;
207 struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
208 uint32_t pipe = intel_crtc->pipe;
209 uint32_t save_bclrpat;
210 uint32_t save_vtotal;
211 uint32_t vtotal, vactive;
212 uint32_t vsample;
213 uint32_t vblank, vblank_start, vblank_end;
214 uint32_t dsl;
215 uint32_t bclrpat_reg;
216 uint32_t vtotal_reg;
217 uint32_t vblank_reg;
218 uint32_t vsync_reg;
219 uint32_t pipeconf_reg;
220 uint32_t pipe_dsl_reg;
221 uint8_t st00;
222 enum drm_connector_status status;
223
224 if (pipe == 0) {
225 bclrpat_reg = BCLRPAT_A;
226 vtotal_reg = VTOTAL_A;
227 vblank_reg = VBLANK_A;
228 vsync_reg = VSYNC_A;
229 pipeconf_reg = PIPEACONF;
230 pipe_dsl_reg = PIPEADSL;
231 } else {
232 bclrpat_reg = BCLRPAT_B;
233 vtotal_reg = VTOTAL_B;
234 vblank_reg = VBLANK_B;
235 vsync_reg = VSYNC_B;
236 pipeconf_reg = PIPEBCONF;
237 pipe_dsl_reg = PIPEBDSL;
238 }
239
240 save_bclrpat = I915_READ(bclrpat_reg);
241 save_vtotal = I915_READ(vtotal_reg);
242 vblank = I915_READ(vblank_reg);
243
244 vtotal = ((save_vtotal >> 16) & 0xfff) + 1;
245 vactive = (save_vtotal & 0x7ff) + 1;
246
247 vblank_start = (vblank & 0xfff) + 1;
248 vblank_end = ((vblank >> 16) & 0xfff) + 1;
249
250 /* Set the border color to purple. */
251 I915_WRITE(bclrpat_reg, 0x500050);
252
253 if (IS_I9XX(dev)) {
254 uint32_t pipeconf = I915_READ(pipeconf_reg);
255 I915_WRITE(pipeconf_reg, pipeconf | PIPECONF_FORCE_BORDER);
256 /* Wait for next Vblank to substitue
257 * border color for Color info */
258 intel_wait_for_vblank(dev);
259 st00 = I915_READ8(VGA_MSR_WRITE);
260 status = ((st00 & (1 << 4)) != 0) ?
261 connector_status_connected :
262 connector_status_disconnected;
263
264 I915_WRITE(pipeconf_reg, pipeconf);
265 } else {
266 bool restore_vblank = false;
267 int count, detect;
268
269 /*
270 * If there isn't any border, add some.
271 * Yes, this will flicker
272 */
273 if (vblank_start <= vactive && vblank_end >= vtotal) {
274 uint32_t vsync = I915_READ(vsync_reg);
275 uint32_t vsync_start = (vsync & 0xffff) + 1;
276
277 vblank_start = vsync_start;
278 I915_WRITE(vblank_reg,
279 (vblank_start - 1) |
280 ((vblank_end - 1) << 16));
281 restore_vblank = true;
282 }
283 /* sample in the vertical border, selecting the larger one */
284 if (vblank_start - vactive >= vtotal - vblank_end)
285 vsample = (vblank_start + vactive) >> 1;
286 else
287 vsample = (vtotal + vblank_end) >> 1;
288
289 /*
290 * Wait for the border to be displayed
291 */
292 while (I915_READ(pipe_dsl_reg) >= vactive)
293 ;
294 while ((dsl = I915_READ(pipe_dsl_reg)) <= vsample)
295 ;
296 /*
297 * Watch ST00 for an entire scanline
298 */
299 detect = 0;
300 count = 0;
301 do {
302 count++;
303 /* Read the ST00 VGA status register */
304 st00 = I915_READ8(VGA_MSR_WRITE);
305 if (st00 & (1 << 4))
306 detect++;
307 } while ((I915_READ(pipe_dsl_reg) == dsl));
308
309 /* restore vblank if necessary */
310 if (restore_vblank)
311 I915_WRITE(vblank_reg, vblank);
312 /*
313 * If more than 3/4 of the scanline detected a monitor,
314 * then it is assumed to be present. This works even on i830,
315 * where there isn't any way to force the border color across
316 * the screen
317 */
318 status = detect * 4 > count * 3 ?
319 connector_status_connected :
320 connector_status_disconnected;
321 }
322
323 /* Restore previous settings */
324 I915_WRITE(bclrpat_reg, save_bclrpat);
325
326 return status;
327}
328
201static enum drm_connector_status intel_crt_detect(struct drm_connector *connector) 329static enum drm_connector_status intel_crt_detect(struct drm_connector *connector)
202{ 330{
203 struct drm_device *dev = connector->dev; 331 struct drm_device *dev = connector->dev;
332 struct intel_output *intel_output = to_intel_output(connector);
333 struct drm_encoder *encoder = &intel_output->enc;
334 struct drm_crtc *crtc;
335 int dpms_mode;
336 enum drm_connector_status status;
204 337
205 if (IS_I9XX(dev) && !IS_I915G(dev) && !IS_I915GM(dev)) { 338 if (IS_I9XX(dev) && !IS_I915G(dev) && !IS_I915GM(dev)) {
206 if (intel_crt_detect_hotplug(connector)) 339 if (intel_crt_detect_hotplug(connector))
@@ -212,8 +345,20 @@ static enum drm_connector_status intel_crt_detect(struct drm_connector *connecto
212 if (intel_crt_detect_ddc(connector)) 345 if (intel_crt_detect_ddc(connector))
213 return connector_status_connected; 346 return connector_status_connected;
214 347
215 /* TODO use load detect */ 348 /* for pre-945g platforms use load detect */
216 return connector_status_unknown; 349 if (encoder->crtc && encoder->crtc->enabled) {
350 status = intel_crt_load_detect(encoder->crtc, intel_output);
351 } else {
352 crtc = intel_get_load_detect_pipe(intel_output,
353 NULL, &dpms_mode);
354 if (crtc) {
355 status = intel_crt_load_detect(crtc, intel_output);
356 intel_release_load_detect_pipe(intel_output, dpms_mode);
357 } else
358 status = connector_status_unknown;
359 }
360
361 return status;
217} 362}
218 363
219static void intel_crt_destroy(struct drm_connector *connector) 364static void intel_crt_destroy(struct drm_connector *connector)