[PATCH] drm/i915/dp: Fix DP MST error after unplugging TypeC cable

[Manasi Navare]

On Wed, Sep 18, 2019 at 07:09:43AM +0530, srinivasan.s at intel.com wrote:
> From: Srinivasan S <srinivasan.s at intel.com>
> 
> This patch avoids DP MST payload error message in dmesg, as it is trying
> to read the payload from the disconnected DP MST device. After the unplug
> the connector status is disconnected and we should not be looking for the
> payload and hence remove the error and throw the warning.
> 
> This details can be found in:
> https://bugs.freedesktop.org/show_bug.cgi?id=111632

Please add this link as Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=111632 after the Sign off
statement

> 
> Signed-off-by: Srinivasan S <srinivasan.s at intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_dp_mst.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
> index eeeb3f933aa4..5b2278fdf675 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
> @@ -215,7 +215,12 @@ static void intel_mst_disable_dp(struct intel_encoder *encoder,
>  
>  	ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr);
>  	if (ret) {
> -		DRM_ERROR("failed to update payload %d\n", ret);
> +		if (!connector ||
> +		    connector->base.status != connector_status_connected) {
> +			DRM_WARN("DP MST disconnect\n");

May be adding this check before calling drm_dp_update_payload_part1() is a better idea?
If the connector is disconnected, why update payload?

Jani, Ville, thoughts?

Regards
Manasi

> +		} else {
> +			DRM_ERROR("failed to update payload %d\n", ret);
> +		}
>  	}
>  	if (old_crtc_state->has_audio)
>  		intel_audio_codec_disable(encoder,
> -- 
> 2.7.4
>