[Intel-gfx] [PATCH v2 11/15] drm/i915: Protect DSPARB registers with a spinlock

[Ville Syrjälä]

On Tue, Dec 06, 2016 at 09:26:22AM +0100, Maarten Lankhorst wrote:
> Op 05-12-16 om 15:13 schreef ville.syrjala at linux.intel.com:
> > From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> >
> > Each DSPARB register can house bits for two separate pipes, hence
> > we must protect the registers during reprogramming so that parallel
> > FIFO reconfigurations happening simultaneosly on multiple pipes won't
> > corrupt each others values.
> >
> > We'll use a new spinlock for this instead of the wm_mutex since we'll
> > have to move the DSPARB programming to happen from the vblank evade
> > critical section, and we can't use mutexes in there.
> >
> > v2: Document why we use a spinlock instead of a mutex (Maarten)
> >
> > Cc: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
> > Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Reviewed-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>

Thanks. Pushed to dinq.

-- 
Ville Syrjälä
Intel OTC