Re: [PATCH 2/3] drm/i915: Move WaProgramL3SqcReg1Default:bdw to init_clock_gating()

[Jesse Barnes <jbarnes@virtuousgeek.org>]

On 05/19/2015 10:32 AM, ville.syrjala@linux.intel.com wrote:
> From: Ville Syrjälä <ville.syrjala@linux.intel.com>
> 
> GEN8_L3SQCREG1 isn't saved in the context (verified by going through
> a context dump), and so we shouldn't be using the ring w/a code to
> initialize it. Also Bspec explicitly talks about MMIO and writing it
> with the CPU.
> 
> Additionally there's another w/a WaTempDisableDOPClkGating:bdw which
> tells us to disable DOP clock gating around the GEN8_L3SQCREG1 write
> to make sure everyone notices the change. So let's do that as well.
> 
> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> ---
>  drivers/gpu/drm/i915/intel_pm.c         | 10 ++++++++++
>  drivers/gpu/drm/i915/intel_ringbuffer.c |  3 ---
>  2 files changed, 10 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index 206bd41..5ec56b6 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -6165,6 +6165,7 @@ static void broadwell_init_clock_gating(struct drm_device *dev)
>  {
>  	struct drm_i915_private *dev_priv = dev->dev_private;
>  	enum pipe pipe;
> +	uint32_t misccpctl;
>  
>  	ilk_init_lp_watermarks(dev);
>  
> @@ -6195,6 +6196,15 @@ static void broadwell_init_clock_gating(struct drm_device *dev)
>  	I915_WRITE(GEN8_UCGCTL6, I915_READ(GEN8_UCGCTL6) |
>  		   GEN8_SDEUNIT_CLOCK_GATE_DISABLE);
>  
> +	/*
> +	 * WaProgramL3SqcReg1Default:bdw
> +	 * WaTempDisableDOPClkGating:bdw
> +	 */
> +	misccpctl = I915_READ(GEN7_MISCCPCTL);
> +	I915_WRITE(GEN7_MISCCPCTL, misccpctl & ~GEN7_DOP_CLOCK_GATE_ENABLE);
> +	I915_WRITE(GEN8_L3SQCREG1, BDW_WA_L3SQCREG1_DEFAULT);
> +	I915_WRITE(GEN7_MISCCPCTL, misccpctl);
> +
>  	lpt_init_clock_gating(dev);
>  }
>  
> diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
> index 9b96ed7..50cdd67 100644
> --- a/drivers/gpu/drm/i915/intel_ringbuffer.c
> +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
> @@ -853,9 +853,6 @@ static int bdw_init_workarounds(struct intel_engine_cs *ring)
>  			    GEN6_WIZ_HASHING_MASK,
>  			    GEN6_WIZ_HASHING_16x4);
>  
> -	/* WaProgramL3SqcReg1Default:bdw */
> -	WA_WRITE(GEN8_L3SQCREG1, BDW_WA_L3SQCREG1_DEFAULT);
> -
>  	return 0;
>  }
>  
> 

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