[Intel-gfx] [PATCH] drm/i915: Fix legacy cursor vs. watermarks for ILK-BDW

[Uwe Kleine-König]

Hello Ville,

On Fri, Feb 17, 2017 at 05:01:59PM +0200, ville.syrjala at linux.intel.com wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> In order to make cursor updates actually safe wrt. watermark programming
> we have to clear the legacy_cursor_update flag in the atomic state. That
> will cause the regular atomic update path to do the necessary vblank
> wait after the plane update if needed, otherwise the vblank wait would
> be skipped and we'd feed the optimal watermarks to the hardware before
> the plane update has actually happened.
> 
> [...]
> 
> Cc: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
> Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
> Cc: Uwe Kleine-König <uwe at kleine-koenig.org>
> Reported-by: Uwe Kleine-König <uwe at kleine-koenig.org>
> Fixes: f79f26921ee1 ("drm/i915: Add a cursor hack to allow converting legacy page flip to atomic, v3.")
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

Is this supposed to fix
https://bugs.freedesktop.org/show_bug.cgi?id=98742 ? If so, the Fixes:
line seems wrong because f79f26921ee1 isn't in 4.9 where I see the
issue.

If I want to fix 4.9---my ultimate goal is to fix the kernel that will
go into the next stable release---I have to cherry-pick f79f26921ee1
first, I assume?

Best regards
Uwe
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