[Intel-gfx] [PATCH 56/62] drm/i915/bdw: Implement edp PSR workarounds

[Jesse Barnes]

On Sat,  2 Nov 2013 21:07:54 -0700
Ben Widawsky <benjamin.widawsky at intel.com> wrote:

> This implements a workaround for PSR dealing with some vblank issue.
> 
> WaPsrDPAMaskVBlankInSRD && WaPsrDPRSUnmaskVBlankInSRD
> 
> v2: forgot to git add bogus whitespace fix
> 
> v3: Update with workaround names.
> Use for_each_pipe() and CHICKEN_PIPESL_1(pipe) macro (Ville)
> 
> Cc: Art Runyan <arthur.j.runyan at intel.com>
> Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
> ---
>  drivers/gpu/drm/i915/i915_reg.h |  6 ++++++
>  drivers/gpu/drm/i915/intel_pm.c | 17 +++++++++++++++++
>  2 files changed, 23 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index f97836e..9608f96 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -4092,8 +4092,14 @@
>  # define CHICKEN3_DGMG_DONE_FIX_DISABLE		(1 << 2)
>  
>  #define CHICKEN_PAR1_1		0x42080
> +#define  DPA_MASK_VBLANK_SRD	(1 << 15)
>  #define  FORCE_ARB_IDLE_PLANES	(1 << 14)
>  
> +#define _CHICKEN_PIPESL_1_A	0x420b0
> +#define _CHICKEN_PIPESL_1_B	0x420b4
> +#define  DPRS_MASK_VBLANK_SRD	(1 << 0)
> +#define CHICKEN_PIPESL_1(pipe) _PIPE(pipe, _CHICKEN_PIPESL_1_A, _CHICKEN_PIPESL_1_B)
> +
>  #define DISP_ARB_CTL	0x45000
>  #define  DISP_TILE_SURFACE_SWIZZLING	(1<<13)
>  #define  DISP_FBC_WM_DIS		(1<<15)
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index 0245985..63f6e59 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -5288,6 +5288,23 @@ static void gen8_init_clock_gating(struct drm_device *dev)
>  
>  	/* WaSwitchSolVfFArbitrationPriority */
>  	I915_WRITE(GAM_ECOCHK, I915_READ(GAM_ECOCHK) | HSW_ECOCHK_ARB_PRIO_SOL);
> +
> +	if (IS_BROADWELL(dev)) {
> +		enum pipe i;
> +
> +		/* WaPsrDPAMaskVBlankInSRD */
> +		I915_WRITE(CHICKEN_PAR1_1,
> +			   I915_READ(CHICKEN_PAR1_1) | DPA_MASK_VBLANK_SRD);
> +
> +		/* WaPsrDPRSUnmaskVBlankInSRD */
> +		for_each_pipe(i) {
> +			I915_WRITE(CHICKEN_PIPESL_1(i),
> +				   I915_READ(CHICKEN_PIPESL_1(i) |
> +					     DPRS_MASK_VBLANK_SRD));
> +		}
> +	}
> +
> +
>  }
>  
>  static void haswell_init_clock_gating(struct drm_device *dev)

Reviewed-by: Jesse Barnes <jbarnes at virtuousgeek.org>

-- 
Jesse Barnes, Intel Open Source Technology Center