Re: [PATCH v3] drm/i915: Add Wa_1409120013:icl,ehl

[Matt Roper <matthew.d.roper@intel.com>]

On Wed, Jun 12, 2019 at 11:40:53AM -0700, Clinton Taylor wrote:
> Looks good now.
> 
> Reviewed-by: Clint Taylor <Clinton.A.Taylor@intel.com>
> 

CI came back clean, so pushed to dinq.  Thanks for the review.


Matt

> 
> -Clint
> 
> 
> On 6/12/19 11:36 AM, Matt Roper wrote:
> > This chicken bit should be set before enabling FBC to avoid screen
> > corruption when the plane size has odd vertical and horizontal
> > dimensions.  It is safe to leave the bit set even when FBC is disabled.
> > 
> > v2:
> >   - The bspec's name for this bit on these platforms ("Spare 14") is
> >     pretty meaningless.  Let's rename the bit definition to something
> >     that more accurately reflects what the bit really does.  (Clint)
> > 
> > v3:
> >   - The chicken register was already defined (along with a few other
> >     gen9-specific bits) farther down.  Just add the new bit definition
> >     there.  (Clint)
> > 
> > Cc: Clinton Taylor <Clinton.A.Taylor@intel.com>
> > Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
> > ---
> >   drivers/gpu/drm/i915/i915_reg.h  | 1 +
> >   drivers/gpu/drm/i915/intel_fbc.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 edf9f93934a1..368ee717580c 100644
> > --- a/drivers/gpu/drm/i915/i915_reg.h
> > +++ b/drivers/gpu/drm/i915/i915_reg.h
> > @@ -3163,6 +3163,7 @@ enum i915_power_well_id {
> >   #define ILK_DPFC_FENCE_YOFF	_MMIO(0x43218)
> >   #define ILK_DPFC_CHICKEN	_MMIO(0x43224)
> >   #define   ILK_DPFC_DISABLE_DUMMY0 (1 << 8)
> > +#define   ILK_DPFC_CHICKEN_COMP_DUMMY_PIXEL	(1 << 14)
> >   #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_fbc.c b/drivers/gpu/drm/i915/intel_fbc.c
> > index 5679f2fffb7c..d36cada2cc7d 100644
> > --- a/drivers/gpu/drm/i915/intel_fbc.c
> > +++ b/drivers/gpu/drm/i915/intel_fbc.c
> > @@ -344,6 +344,10 @@ static void gen7_fbc_activate(struct drm_i915_private *dev_priv)
> >   			   HSW_FBCQ_DIS);
> >   	}
> > +	if (IS_GEN(dev_priv, 11))
> > +		/* Wa_1409120013:icl,ehl */
> > +		I915_WRITE(ILK_DPFC_CHICKEN, ILK_DPFC_CHICKEN_COMP_DUMMY_PIXEL);
> > +
> >   	I915_WRITE(ILK_DPFC_CONTROL, dpfc_ctl | DPFC_CTL_EN);
> >   	intel_fbc_recompress(dev_priv);

-- 
Matt Roper
Graphics Software Engineer
IoTG Platform Enabling & Development
Intel Corporation
(916) 356-2795
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