[Intel-gfx] [PATCH] drm/i915: Fix DISP_POS_Y and DISP_HEIGHT defines

[Ville Syrjälä]

On Wed, Apr 20, 2022 at 05:32:43PM +0200, Hans de Goede wrote:
> Hi Ville,
> 
> On 4/20/22 16:03, Ville Syrjälä wrote:
> > On Mon, Apr 18, 2022 at 05:09:36PM +0200, Hans de Goede wrote:
> >> Commit 428cb15d5b00 ("drm/i915: Clean up pre-skl primary plane registers")
> >> introduced DISP_POS_Y and DISP_HEIGHT defines but accidentally set these
> >> their masks to REG_GENMASK(31, 0) instead of REG_GENMASK(31, 16).
> >>
> >> This breaks the primary display pane on at least pineview machines, fix
> >> the mask to fix the primary display pane only showing black.
> >>
> >> Tested on an Acer One AO532h with an Intel N450 SoC.
> >>
> >> Fixes: 428cb15d5b00 ("drm/i915: Clean up pre-skl primary plane registers")
> >> Cc: José Roberto de Souza <jose.souza at intel.com>
> >> Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
> >> Signed-off-by: Hans de Goede <hdegoede at redhat.com>
> >> ---
> >> Note this fixes a regression in 5.18-rc# and I'm not entirely sure what
> >> the procedure is here. Once I get a Reviewed-by or Acked-by and I push
> >> this to drm-intel-next (where it also is necessary), should I then also
> >> push it to drm-intel-fixes or will the current drm-intel-fixes
> >> maintainer pick it up?
> >> ---
> >>  drivers/gpu/drm/i915/i915_reg.h | 4 ++--
> >>  1 file changed, 2 insertions(+), 2 deletions(-)
> >>
> >> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> >> index 51f46fe45c72..5f1f38684d65 100644
> >> --- a/drivers/gpu/drm/i915/i915_reg.h
> >> +++ b/drivers/gpu/drm/i915/i915_reg.h
> >> @@ -4352,12 +4352,12 @@
> >>  #define _DSPAADDR				0x70184
> >>  #define _DSPASTRIDE				0x70188
> >>  #define _DSPAPOS				0x7018C /* reserved */
> >> -#define   DISP_POS_Y_MASK		REG_GENMASK(31, 0)
> >> +#define   DISP_POS_Y_MASK		REG_GENMASK(31, 16)
> > 
> > Doh. I guess I only tested it on plane A where the plane gets its size
> > from PIPESRC instead. And looks like the failure mode is such that
> > the likes of kms_plane/pixel-formats still gets consistent looking CRCs
> > even with the misconfigured plane size :/
> > 
> > Thanks for the fix. Pushed to drm-intel-next.
> 
> Thank you pushing this out, will you (or someone else from Intel)
> also take care of getting this on its way to 5.18-rc# ?

It has a fixes tag so it should get cherry-picked for fixes.

-- 
Ville Syrjälä
Intel