Re: [PATCH] drm/bridge: analogix: Don't return -EINVAL when panel not support PSR in PSR functions

[Archit Taneja]

Hi,

On 12/02/2016 08:02 AM, zain wang wrote:
> We will ignored PSR setting if panel not support it. So, in this case, we should
> return from analogix_dp_enable/disable_psr() without any error code.
> Let's retrun 0 instead of -EINVAL when panel not support PSR in
> analogix_dp_enable/disable_psr().
>
> Signed-off-by: zain wang <wzz@xxxxxxxxxxxxxx>
> ---
>  drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> index 6e0447f..0cb3695 100644
> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> @@ -112,7 +112,7 @@ int analogix_dp_enable_psr(struct device *dev)
>  	struct edp_vsc_psr psr_vsc;
>
>  	if (!dp->psr_support)
> -		return -EINVAL;
> +		return 0;

Looking at the rockchip analogix dp code, in analogix_dp_psr_set, the worker that calls
analogix_dp_enable/disable_psr isn't even if psr isn't enabled. So, the bridge funcs
shouldn't be called in the first place. I think the error handling is fine to have
here.

>  	/* Prepare VSC packet as per EDP 1.4 spec, Table 6.9 */
>  	memset(&psr_vsc, 0, sizeof(psr_vsc));
> @@ -135,7 +135,7 @@ int analogix_dp_disable_psr(struct device *dev)
>  	struct edp_vsc_psr psr_vsc;
>
>  	if (!dp->psr_support)
> -		return -EINVAL;
> +		return 0;
>
>  	/* Prepare VSC packet as per EDP 1.4 spec, Table 6.9 */
>  	memset(&psr_vsc, 0, sizeof(psr_vsc));
> @@ -878,6 +878,8 @@ static void analogix_dp_commit(struct analogix_dp_device *dp)
>  	dp->psr_support = analogix_dp_detect_sink_psr(dp);
>  	if (dp->psr_support)
>  		analogix_dp_enable_sink_psr(dp);
> +	else
> +		dev_warn(dp->dev, "Sink not support PSR\n");

This doesn't seem beneficial either. There seems to be a debug
print already in analogix_dp_detect_sink_psr which reports PSR
related info.

Archit

>  }
>
>  /*

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