[Intel-gfx] [PATCH v7 4/4] drm/i915: Add transcoder restriction to PSR2

[Gupta, Anshuman]

On 7/31/2019 4:17 AM, José Roberto de Souza wrote:
> According to PSR2_CTL definition on BSpec there is only one instance
> of PSR2_CTL also ICL display overview state that PSR2 is only
> supported in EDP transcoder, so now that is possible to have PSR in
> any transcoder lets add this hardware restriction.
> 
> BSpec: 7713
> BSpec: 20584
> Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com>
> Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
> Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
> ---
>   drivers/gpu/drm/i915/display/intel_psr.c | 5 +++++
>   1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
> index f06b4a0b9e26..526990767c52 100644
> --- a/drivers/gpu/drm/i915/display/intel_psr.c
> +++ b/drivers/gpu/drm/i915/display/intel_psr.c
> @@ -545,6 +545,11 @@ static bool intel_psr2_config_valid(struct intel_dp *intel_dp,
>   	if (!dev_priv->psr.sink_psr2_support)
>   		return false;
>   
> +	if (crtc_state->cpu_transcoder != TRANSCODER_EDP) {
> +		DRM_DEBUG_KMS("PSR2 is only supported in EDP transcoder\n");
> +		return false;
> +	}
> +
TGL supports PSR2 on TRANSCODER_A, am i missing anything here?
>   	/*
>   	 * DSC and PSR2 cannot be enabled simultaneously. If a requested
>   	 * resolution requires DSC to be enabled, priority is given to DSC
>