Re: [PATCH 2/6] drm/i915: Fix max cursor size for i915g/gm

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Quoting Ville Syrjala (2019-10-28 11:30:32)
> From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> 
> Apparently the 128x128 and 256x256 ARGB cursor modes were
> only added on LPT/CST.
> 
> While the display section of bspec isn't super clear on the
> subject, it does highlight these two modes in a different
> color, has a few changlog entries indicating the 256x256 mode
> was added for a LPT DCN, and that the 128x128 mode was also
> added later (though no DCN/platform note there).
> 
> The "device dependencies" bspec section does list the 256x256x32
> as a new feature for LPT/CST, and goes on to mention that current
> hw only has the 64x64x32 mode (which reinforces the notion that
> the 128x128 mode was also added at the same time).
> 
> Testing on actual hardware confirms all of this. CI shows all
> the 128x128 and 256x256 tests failing on GDG, and my ALV
> definitely doesn't like them.
> 
> So we shall limit GDG/ALV to 64x64 only. And while at it
> let's adjust the mobile gen2 case to list the two platforms
> explicitly so that the if-ladder looks reasonably uniform.
> 
> Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Acked-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
-Chris
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