From: Ville Syrjälä <ville.syrj...@linux.intel.com>
If there's no VBT mode not EDID, just read out the current SDVO output
timings, and use the result as the preferred mode for the display.
Signed-off-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
---
This patch is a total shot in the dark since you didn't provide logs. But
in theory it might do something useful if there's no VBT or EDID available
on the system.
drivers/gpu/drm/i915/intel_sdvo.c | 38 ++++++++++++++++++++++++++++++++++++++
1 file changed, 38 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_sdvo.c
b/drivers/gpu/drm/i915/intel_sdvo.c
index 95bdfb3..e9f326c 100644
--- a/drivers/gpu/drm/i915/intel_sdvo.c
+++ b/drivers/gpu/drm/i915/intel_sdvo.c
@@ -759,6 +759,13 @@ static bool intel_sdvo_get_input_timing(struct intel_sdvo
*intel_sdvo,
SDVO_CMD_GET_INPUT_TIMINGS_PART1, dtd);
}
+static bool intel_sdvo_get_output_timing(struct intel_sdvo *intel_sdvo,
+ struct intel_sdvo_dtd *dtd)
+{
+ return intel_sdvo_get_timing(intel_sdvo,
+ SDVO_CMD_GET_OUTPUT_TIMINGS_PART1, dtd);
+}
+
static bool
intel_sdvo_create_preferred_input_timing(struct intel_sdvo *intel_sdvo,
uint16_t clock,
@@ -1922,6 +1929,26 @@ static void intel_sdvo_get_tv_modes(struct drm_connector
*connector)
}
}
+static struct drm_display_mode *intel_sdvo_get_output_mode(struct
drm_connector *connector)
+{
+ struct intel_sdvo *intel_sdvo = intel_attached_sdvo(connector);
+ struct drm_display_mode *mode;
+ struct intel_sdvo_dtd dtd;
+
+ if (!intel_sdvo_get_output_timing(intel_sdvo, &dtd)) {
+ DRM_DEBUG_DRIVER("failed to retrieve SDVO DTD\n");
+ return NULL;
+ }
+
+ mode = drm_mode_create(connector->dev);
+ if (!mode)
+ return NULL;
+
+ intel_sdvo_get_mode_from_dtd(mode, &dtd);
+
+ return mode;
+}
+
static void intel_sdvo_get_lvds_modes(struct drm_connector *connector)
{
struct intel_sdvo *intel_sdvo = intel_attached_sdvo(connector);
@@ -1953,6 +1980,17 @@ static void intel_sdvo_get_lvds_modes(struct
drm_connector *connector)
*/
intel_ddc_get_modes(connector, &intel_sdvo->ddc);
+ /* If there's nothing else try the current output timings */
+ if (list_empty(&connector->probed_modes)) {
+ newmode = intel_sdvo_get_output_mode(connector);
+ if (newmode != NULL) {
+ /* Guarantee the mode is preferred */
+ newmode->type = (DRM_MODE_TYPE_PREFERRED |
+ DRM_MODE_TYPE_DRIVER);
+ drm_mode_probed_add(connector, newmode);
+ }
+ }
+
list_for_each_entry(newmode, &connector->probed_modes, head) {
if (newmode->type & DRM_MODE_TYPE_PREFERRED) {
intel_sdvo->sdvo_lvds_fixed_mode =
--
1.8.3.2
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