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

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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>
This commit is contained in:
Zhao Yakui 2009-11-06 15:39:56 +08:00 committed by Eric Anholt
parent 04b2d21800
commit d09c23de9f
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/i915/intel_sdvo.c
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@ -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);