[PATCH v5 07/11] drm/rockchip: Check for fast link training before enabling psr

[Sean Paul]

On Tue, Jun 11, 2019 at 12:08:21PM -0400, Sean Paul wrote:
> From: Sean Paul <seanpaul at chromium.org>
> 
> Once we start shutting off the link during PSR, we're going to want fast
> training to work. If the display doesn't support fast training, don't
> enable psr.
> 
> Changes in v2:
> - None
> Changes in v3:
> - None
> Changes in v4:
> - None
> Changes in v5:
> - None
> 
> Link to v1: https://patchwork.freedesktop.org/patch/msgid/20190228210939.83386-3-sean@poorly.run
> Link to v2: https://patchwork.freedesktop.org/patch/msgid/20190326204509.96515-2-sean@poorly.run
> Link to v3: https://patchwork.freedesktop.org/patch/msgid/20190502194956.218441-9-sean@poorly.run
> Link to v4: https://patchwork.freedesktop.org/patch/msgid/20190508160920.144739-8-sean@poorly.run
> 
> Cc: Zain Wang <wzz at rock-chips.com>
> Cc: Tomasz Figa <tfiga at chromium.org>
> Tested-by: Heiko Stuebner <heiko at sntech.de>

@Heiko, could you please review patches 7-11? I'm worried they're going to start
to rot and the helpers have already landed in Linus' tree.

Thanks,

Sean

> Signed-off-by: Sean Paul <seanpaul at chromium.org>
> ---
>  drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> index d2de98d441845..a07d19e08b803 100644
> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> @@ -1040,16 +1040,17 @@ static int analogix_dp_commit(struct analogix_dp_device *dp)
>  	if (ret)
>  		return ret;
>  
> +	/* Check whether panel supports fast training */
> +	ret = analogix_dp_fast_link_train_detection(dp);
> +	if (ret)
> +		dp->psr_enable = false;
> +
>  	if (dp->psr_enable) {
>  		ret = analogix_dp_enable_sink_psr(dp);
>  		if (ret)
>  			return ret;
>  	}
>  
> -	/* Check whether panel supports fast training */
> -	ret =  analogix_dp_fast_link_train_detection(dp);
> -	if (ret)
> -		dp->psr_enable = false;
>  
>  	return ret;
>  }
> -- 
> Sean Paul, Software Engineer, Google / Chromium OS
> 

-- 
Sean Paul, Software Engineer, Google / Chromium OS