[Intel-gfx] [PATCH 27/27] drm/i915/gen9: Add WaFbcHighMemBwCorruptionAvoidance

[Ville Syrjälä]

On Tue, Jun 07, 2016 at 05:19:19PM +0300, Mika Kuoppala wrote:
> Add this fbc related workaround for all gen9
> 
> Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Signed-off-by: Mika Kuoppala <mika.kuoppala at intel.com>

Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

> ---
>  drivers/gpu/drm/i915/i915_reg.h | 1 +
>  drivers/gpu/drm/i915/intel_pm.c | 4 ++++
>  2 files changed, 5 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index f6a140b2c77c..81d1896f158c 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -2209,6 +2209,7 @@ enum skl_disp_power_wells {
>  #define ILK_DPFC_STATUS		_MMIO(0x43210)
>  #define ILK_DPFC_FENCE_YOFF	_MMIO(0x43218)
>  #define ILK_DPFC_CHICKEN	_MMIO(0x43224)
> +#define   ILK_DPFC_DISABLE_DUMMY0 (1<<8)
>  #define   ILK_DPFC_NUKE_ON_ANY_MODIFICATION	(1<<23)
>  #define ILK_FBC_RT_BASE		_MMIO(0x2128)
>  #define   ILK_FBC_RT_VALID	(1<<0)
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index 1464d7ba69d4..658a75659657 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -75,6 +75,10 @@ static void gen9_init_clock_gating(struct drm_device *dev)
>  	I915_WRITE(DISP_ARB_CTL, I915_READ(DISP_ARB_CTL) |
>  		   DISP_FBC_WM_DIS |
>  		   DISP_FBC_MEMORY_WAKE);
> +
> +	/* WaFbcHighMemBwCorruptionAvoidance:skl,bxt,kbl */
> +	I915_WRITE(ILK_DPFC_CHICKEN, I915_READ(ILK_DPFC_CHICKEN) |
> +		   ILK_DPFC_DISABLE_DUMMY0);
>  }
>  
>  static void bxt_init_clock_gating(struct drm_device *dev)
> -- 
> 2.7.4

-- 
Ville Syrjälä
Intel OTC