[Intel-gfx] [PATCH 5/5] drm/i915/display/cnl+: Handle fused off DSC

[Ramalingam C]

On 2019-10-18 at 17:41:24 -0700, José Roberto de Souza wrote:
> DSC could be fused off, so not all GEN10+ platforms will support it.
> 
> Cc: Manasi Navare <manasi.d.navare at intel.com>
> Cc: Martin Peres <martin.peres at linux.intel.com>
> Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
Looks good to me.

Reviewed-by: Ramalingam C <ramalingam.c at intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_dp.c  | 3 +++
>  drivers/gpu/drm/i915/i915_pci.c          | 1 +
>  drivers/gpu/drm/i915/i915_reg.h          | 1 +
>  drivers/gpu/drm/i915/intel_device_info.c | 4 ++++
>  drivers/gpu/drm/i915/intel_device_info.h | 1 +
>  5 files changed, 10 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
> index 3792d143bea9..e01690701fdd 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -1888,6 +1888,9 @@ static bool intel_dp_source_supports_dsc(struct intel_dp *intel_dp,
>  {
>  	struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
>  
> +	if (!INTEL_INFO(dev_priv)->display.has_dsc)
> +		return false;
> +
>  	/* On TGL, DSC is supported on all Pipes */
>  	if (INTEL_GEN(dev_priv) >= 12)
>  		return true;
> diff --git a/drivers/gpu/drm/i915/i915_pci.c b/drivers/gpu/drm/i915/i915_pci.c
> index f2280709c8c9..09dbfea7c81f 100644
> --- a/drivers/gpu/drm/i915/i915_pci.c
> +++ b/drivers/gpu/drm/i915/i915_pci.c
> @@ -737,6 +737,7 @@ static const struct intel_device_info intel_coffeelake_gt3_info = {
>  	GEN9_FEATURES, \
>  	GEN(10), \
>  	.ddb_size = 1024, \
> +	.display.has_dsc = 1, \
>  	.has_coherent_ggtt = false, \
>  	GLK_COLORS
>  
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 84fca4f3af5a..bfa301759b6c 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -7665,6 +7665,7 @@ enum {
>  #define SKL_DFSM_PIPE_B_DISABLE			(1 << 21)
>  #define SKL_DFSM_PIPE_C_DISABLE			(1 << 28)
>  #define TGL_DFSM_PIPE_D_DISABLE			(1 << 22)
> +#define CNL_DFSM_DISPLAY_DSC_DISABLE		(1 << 7)
>  
>  #define SKL_DSSM				_MMIO(0x51004)
>  #define CNL_DSSM_CDCLK_PLL_REFCLK_24MHz		(1 << 31)
> diff --git a/drivers/gpu/drm/i915/intel_device_info.c b/drivers/gpu/drm/i915/intel_device_info.c
> index 97d962944e48..6a24e85c6d10 100644
> --- a/drivers/gpu/drm/i915/intel_device_info.c
> +++ b/drivers/gpu/drm/i915/intel_device_info.c
> @@ -996,6 +996,10 @@ void intel_device_info_runtime_init(struct drm_i915_private *dev_priv)
>  
>  		if (INTEL_GEN(dev_priv) >= 11 && (dfsm & ICL_DFSM_DMC_DISABLE))
>  			info->display.has_csr = 0;
> +
> +		if (INTEL_GEN(dev_priv) >= 10 &&
> +		    (dfsm & CNL_DFSM_DISPLAY_DSC_DISABLE))
> +			info->display.has_dsc = 0;
>  	}
>  
>  	/* Initialize slice/subslice/EU info */
> diff --git a/drivers/gpu/drm/i915/intel_device_info.h b/drivers/gpu/drm/i915/intel_device_info.h
> index 118d922261e2..ba31d68bb7ba 100644
> --- a/drivers/gpu/drm/i915/intel_device_info.h
> +++ b/drivers/gpu/drm/i915/intel_device_info.h
> @@ -136,6 +136,7 @@ enum intel_ppgtt_type {
>  	func(has_ddi); \
>  	func(has_dp_mst); \
>  	func(has_dsb); \
> +	func(has_dsc); \
>  	func(has_fbc); \
>  	func(has_gmch); \
>  	func(has_hdcp); \
> -- 
> 2.23.0
> 
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