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>
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@ -1617,6 +1617,10 @@ static enum drm_connector_status intel_sdvo_detect(struct drm_connector *connect
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intel_sdvo_write_cmd(intel_output,
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SDVO_CMD_GET_ATTACHED_DISPLAYS, NULL, 0);
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if (sdvo_priv->is_tv) {
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/* add 30ms delay when the output type is SDVO-TV */
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mdelay(30);
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}
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status = intel_sdvo_read_response(intel_output, &response, 2);
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DRM_DEBUG_KMS("SDVO response %d %d\n", response & 0xff, response >> 8);
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