[PATCH 1/2] drm: Don't allow page flip to change pixel format

[Jesse Barnes]

That's probably safest, however on Intel we can change the stride and
tiling format for sync flips at least.  But I'm ok with this patch; we
generally need to recalculate bw requirements and watermarks when
adjusting depth and such.

On Thu, 31 May 2012 15:54:03 -0400
Alex Deucher <alexdeucher at gmail.com> wrote:

> On Thu, May 31, 2012 at 3:44 PM, Singh, Satyeshwar
> <satyeshwar.singh at intel.com> wrote:
> > Does this by extension mean that stride changes should also not be allowed while page flipping?
> 
> Everything beyond a crtc base address change should require a full modeset.
> 
> Alex
> 
> > Thanks,
> > Satyeshwar
> >
> > -----Original Message-----
> > From: dri-devel-bounces+satyeshwar.singh=intel.com at lists.freedesktop.org [mailto:dri-devel-bounces+satyeshwar.singh=intel.com at lists.freedesktop.org] On Behalf Of Laurent Pinchart
> > Sent: Thursday, May 31, 2012 9:26 AM
> > To: dri-devel at lists.freedesktop.org
> > Subject: [PATCH 1/2] drm: Don't allow page flip to change pixel format
> >
> > A page flip is not a mode set, changing the frame buffer pixel format doesn't make sense and isn't handled by most drivers anyway. Disallow it.
> >
> > Signed-off-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
> > ---
> >  drivers/gpu/drm/drm_crtc.c |    8 ++++++++
> >  1 files changed, 8 insertions(+), 0 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c index 92cea9d..0d15b56 100644
> > --- a/drivers/gpu/drm/drm_crtc.c
> > +++ b/drivers/gpu/drm/drm_crtc.c
> > @@ -3530,6 +3530,14 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev,
> >                goto out;
> >        }
> >
> > +       if (crtc->fb->pixel_format != fb->pixel_format ||
> > +           crtc->fb->bits_per_pixel != crtc->fb->bits_per_pixel ||
> > +           crtc->fb->depth != fb->depth) {
> > +               DRM_DEBUG_KMS("Page flip is not allowed to change frame buffer format.\n");
> > +               ret = -EINVAL;
> > +               goto out;
> > +       }
> > +
> >        if (page_flip->flags & DRM_MODE_PAGE_FLIP_EVENT) {
> >                ret = -ENOMEM;
> >                spin_lock_irqsave(&dev->event_lock, flags);
> > --
> > 1.7.3.4
> >
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-- 
Jesse Barnes, Intel Open Source Technology Center