drm/i915: Add 30ms delay to make SDVO TV detection reliable.

Without this, on some boots the TV wouldn't be detected. Testing showed 15ms to be insufficient. https://bugs.freedesktop.org/show_bug.cgi?id=24290 https://bugs.freedesktop.org/show_bug.cgi?id=20785 Signed-off-by: Zhao Yakui <yakui.zhao@intel.com> Tested-by: Yan Seiner <yan@seiner.com> Signed-off-by: Eric Anholt <eric@anholt.net>
mariux64 · Dec 1, 2009 · d09c23d · d09c23d
1 parent 04b2d21
commit d09c23d
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/drivers/gpu/drm/i915/intel_sdvo.c b/drivers/gpu/drm/i915/intel_sdvo.c
@@ -1617,6 +1617,10 @@ static enum drm_connector_status intel_sdvo_detect(struct drm_connector *connect
 
 	intel_sdvo_write_cmd(intel_output,
 			     SDVO_CMD_GET_ATTACHED_DISPLAYS, NULL, 0);
+	if (sdvo_priv->is_tv) {
+		/* add 30ms delay when the output type is SDVO-TV */
+		mdelay(30);
+	}
 	status = intel_sdvo_read_response(intel_output, &response, 2);
 
 	DRM_DEBUG_KMS("SDVO response %d %d\n", response & 0xff, response >> 8);