[Intel-gfx] [PATCH v2 06/40] drm/i915: Add transcoder restriction to PSR2

[Lucas De Marchi]

On Sat, Aug 17, 2019 at 02:38:28AM -0700, Lucas De Marchi wrote:
>From: José Roberto de Souza <jose.souza at intel.com>
>
>According to PSR2_CTL definition in BSpec there is only one instance of
>PSR2_CTL. Platforms gen < 12 with EDP transcoder only support PSR2 on
>TRANSCODER_EDP while on TGL PSR2 is only supported by TRANSCODER_A.
>
>Since BDW PSR is allowed on any port, but we need to restrict by transcoder.
>
>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>
>Signed-off-by: Lucas De Marchi <lucas.demarchi at intel.com>
>---
> drivers/gpu/drm/i915/display/intel_psr.c | 16 ++++++++++++++++
> 1 file changed, 16 insertions(+)
>
>diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
>index 77232f6bca17..4353270bd65c 100644
>--- a/drivers/gpu/drm/i915/display/intel_psr.c
>+++ b/drivers/gpu/drm/i915/display/intel_psr.c
>@@ -534,6 +534,16 @@ static void hsw_activate_psr2(struct intel_dp *intel_dp)
> 	I915_WRITE(EDP_PSR2_CTL(dev_priv->psr.transcoder), val);
> }
>
>+static bool
>+_psr2_supported_in_trans(struct drm_i915_private *dev_priv,

why the first underscore? I'd name this psr2_supported() - the fact that
it is "in transcoder" is already explicit by the arguments.

With that
Reviewed-by: Lucas De Marchi <lucas.demarchi at intel.com>

Lucas De Marchi

>+			 enum transcoder trans)
>+{
>+	if (INTEL_GEN(dev_priv) >= 12)
>+		return trans == TRANSCODER_A;
>+	else
>+		return trans == TRANSCODER_EDP;
>+}
>+
> static bool intel_psr2_config_valid(struct intel_dp *intel_dp,
> 				    struct intel_crtc_state *crtc_state)
> {
>@@ -545,6 +555,12 @@ static bool intel_psr2_config_valid(struct intel_dp *intel_dp,
> 	if (!dev_priv->psr.sink_psr2_support)
> 		return false;
>
>+	if (!_psr2_supported_in_trans(dev_priv, crtc_state->cpu_transcoder)) {
>+		DRM_DEBUG_KMS("PSR2 not supported in transcoder %s\n",
>+			      transcoder_name(crtc_state->cpu_transcoder));
>+		return false;
>+	}
>+
> 	/*
> 	 * DSC and PSR2 cannot be enabled simultaneously. If a requested
> 	 * resolution requires DSC to be enabled, priority is given to DSC
>-- 
>2.21.0
>