[Intel-gfx] [PATCH 1/2] drm/i915: Always use cpp==4 for FW_BLC_SELF on 915GM/945GM

[Ville Syrjälä]

On Fri, Jul 29, 2016 at 05:32:32PM +0100, Chris Wilson wrote:
> On Fri, Jul 29, 2016 at 05:57:01PM +0300, ville.syrjala at linux.intel.com wrote:
> > From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> > 
> > Bspec says:
> > "FW_BLC_SELF
> >  ...
> >  Programming Note [DevALV] and [DevCST]: When calculating watermark
> >  values for 15/16bpp, assume 32bpp for purposes of calculation using
> >  the high priority bandwidth analysis spreadsheet."
> 
> It does indeed.
> 
> > Let's do that.
> > 
> > Perhaps this might even help with the problem that resulted in
> > commit 2ab1bc9df01d ("drm/i915: Disable self-refresh for untiled fbs on i915gm")
> > 
> > Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
> > Cc: Chris Wilson <chris at chris-wilson.co.uk>
> > Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> > ---
> >  drivers/gpu/drm/i915/intel_pm.c | 3 +++
> >  1 file changed, 3 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> > index 1ac32428d4db..8cfef7683088 100644
> > --- a/drivers/gpu/drm/i915/intel_pm.c
> > +++ b/drivers/gpu/drm/i915/intel_pm.c
> > @@ -1604,6 +1604,9 @@ static void i9xx_update_wm(struct drm_crtc *unused_crtc)
> >  		unsigned long line_time_us;
> >  		int entries;
> >  
> > +		if (IS_I915GM(dev) || IS_I945GM(dev))
> > +			cpp = 4;
> > +
> 
> Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>

Series pushed to dinq. Thanks for the reviews.

-- 
Ville Syrjälä
Intel OTC