[PATCH v2] drm/amd/display: Improvise error handling for DP sink power states

[Aurabindo Pillai]

Reviewed-by: Aurabindo Pillai <aurabindo.pillai at amd.com>

On 4/13/23 14:02, Srinivasan Shanmugam wrote:
> Log if we fail to setup sink power states.
> 
> Cc: Fangzhi Zuo <Jerry.Zuo at amd.com>
> Cc: Aurabindo Pillai <aurabindo.pillai at amd.com>
> Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam at amd.com>
> ---
> 
> v2:
> 
> - Change DC_LOG_HW_LINK_TRAINING to DC_LOG_DC, as link training related
>    code moved to drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training.c (Aurabindo)
> 
> 
>   .../gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c | 3 +++
>   1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c
> index c840ef17802e..ba98013fecd0 100644
> --- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c
> +++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c
> @@ -1043,6 +1043,9 @@ static enum dc_status wake_up_aux_channel(struct dc_link *link)
>   				DP_SET_POWER,
>   				&dpcd_power_state,
>   				sizeof(dpcd_power_state));
> +		if (status < 0)
> +			DC_LOG_DC("%s: Failed to power up sink: %s\n", __func__,
> +				  dpcd_power_state == DP_SET_POWER_D0 ? "D0" : "D3");
>   		return DC_ERROR_UNEXPECTED;
>   	}
>