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Date: Thu, 19 Feb 2015 22:31:48 +0200
From: Ville Syrjälä <ville.syrjala@...ux.intel.com>
To: Kamal Mostafa <kamal@...onical.com>
Cc: linux-kernel@...r.kernel.org, stable@...r.kernel.org,
kernel-team@...ts.ubuntu.com,
Daniel Vetter <daniel.vetter@...ll.ch>
Subject: Re: [PATCH 3.13.y-ckt 019/103] drm/i915: Swap primary planes on gen2
for FBC
On Thu, Feb 19, 2015 at 10:55:42AM -0800, Kamal Mostafa wrote:
> On Thu, 2015-02-19 at 11:31 +0200, Ville Syrjälä wrote:
> > On Wed, Feb 18, 2015 at 04:31:46PM -0800, Kamal Mostafa wrote:
> > > 3.13.11-ckt16 -stable review patch. If anyone has any objections, please let me know.
> > >
> > > ------------------
> > >
> > > From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <ville.syrjala@...ux.intel.com>
> > >
> > > commit 1f1c2e2468f937cefd6bcb645c959c7b5d9821df upstream.
> > >
> > > Only plane A is FBC capable on gen2 (like gen3), but the panel fitter
> > > is hooked up to pipe B, so we want to prefer pipe B + plane A.
> >
> > FBC doesn't even work on gen2 (still missing my stolen mem patches) so
> > this patch doesn't really seem like stable material to me. But I take
> > it you backported it to get the prepare_page_flip() patch to apply cleanly?
>
> Yes, exactly (and I forgot to note that in my commit message).
>
> > If you really want to do that, then you should also backport
> >
> > commit 38af6096781e2ed3d83b970218dedfe98e2f8f9c
> > Author: Ville Syrjälä <ville.syrjala@...ux.intel.com>
> > Date: Tue Jan 7 16:15:37 2014 +0200
> >
> > drm/i915: Don't swap planes on 830M
>
> I will pick up that one too. So this 3.13-stable release will include
> all three of these, barring any further objections:
>
> 7d47559 drm/i915: Don't call intel_prepare_page_flip() multiple times on gen2-4
> 38af609 drm/i915: Don't swap planes on 830M
> 1f1c2e2 drm/i915: Swap primary planes on gen2 for FBC
>
> > othwerwise you may have some angry 830 users knocking at the door,
> > assuming there are more than two of us :) Although 830 support has
> > been more or less broken since forever until 3.18 so maybe no one
> > would notice anyway.
>
> Thanks very much for the guidance, Ville.
No problem.
When fixing a regression we do try to identify the bad commit in the
commit message of the fix. So when considering backporting a commit, I
think it would be a good idea to grep more recent commit messages for
its hash, just in case it has caused some regression.
>
> -Kamal
>
>
> >
> > >
> > > Signed-off-by: Ville Syrjälä <ville.syrjala@...ux.intel.com>
> > > Reviewed-by: Chris Wilson <chris@...is-wilson.co.uk>
> > > [danvet: Add the code comment Chris requested in his review.]
> > > Signed-off-by: Daniel Vetter <daniel.vetter@...ll.ch>
> > >
> > > Signed-off-by: Kamal Mostafa <kamal@...onical.com>
> > > ---
> > > drivers/gpu/drm/i915/i915_irq.c | 14 +++++++++-----
> > > drivers/gpu/drm/i915/intel_display.c | 7 +++++--
> > > 2 files changed, 14 insertions(+), 7 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> > > index 3a10da2..5e0b5e4 100644
> > > --- a/drivers/gpu/drm/i915/i915_irq.c
> > > +++ b/drivers/gpu/drm/i915/i915_irq.c
> > > @@ -3155,10 +3155,10 @@ static int i8xx_irq_postinstall(struct drm_device *dev)
> > > * Returns true when a page flip has completed.
> > > */
> > > static bool i8xx_handle_vblank(struct drm_device *dev,
> > > - int pipe, u16 iir)
> > > + int plane, int pipe, u32 iir)
> > > {
> > > drm_i915_private_t *dev_priv = dev->dev_private;
> > > - u16 flip_pending = DISPLAY_PLANE_FLIP_PENDING(pipe);
> > > + u16 flip_pending = DISPLAY_PLANE_FLIP_PENDING(plane);
> > >
> > > if (!drm_handle_vblank(dev, pipe))
> > > return false;
> > > @@ -3166,7 +3166,7 @@ static bool i8xx_handle_vblank(struct drm_device *dev,
> > > if ((iir & flip_pending) == 0)
> > > return false;
> > >
> > > - intel_prepare_page_flip(dev, pipe);
> > > + intel_prepare_page_flip(dev, plane);
> > >
> > > /* We detect FlipDone by looking for the change in PendingFlip from '1'
> > > * to '0' on the following vblank, i.e. IIR has the Pendingflip
> > > @@ -3235,9 +3235,13 @@ static irqreturn_t i8xx_irq_handler(int irq, void *arg)
> > > notify_ring(dev, &dev_priv->ring[RCS]);
> > >
> > > for_each_pipe(pipe) {
> > > + int plane = pipe;
> > > + if (IS_MOBILE(dev))
> > > + plane = !plane;
> > > +
> > > if (pipe_stats[pipe] & PIPE_VBLANK_INTERRUPT_STATUS &&
> > > - i8xx_handle_vblank(dev, pipe, iir))
> > > - flip_mask &= ~DISPLAY_PLANE_FLIP_PENDING(pipe);
> > > + i8xx_handle_vblank(dev, plane, pipe, iir))
> > > + flip_mask &= ~DISPLAY_PLANE_FLIP_PENDING(plane);
> > >
> > > if (pipe_stats[pipe] & PIPE_CRC_DONE_INTERRUPT_STATUS)
> > > i9xx_pipe_crc_irq_handler(dev, pipe);
> > > diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> > > index 2d2c1e1..ae3bc77 100644
> > > --- a/drivers/gpu/drm/i915/intel_display.c
> > > +++ b/drivers/gpu/drm/i915/intel_display.c
> > > @@ -9949,10 +9949,13 @@ static void intel_crtc_init(struct drm_device *dev, int pipe)
> > > intel_crtc->lut_b[i] = i;
> > > }
> > >
> > > - /* Swap pipes & planes for FBC on pre-965 */
> > > + /*
> > > + * On gen2/3 only plane A can do fbc, but the panel fitter and lvds port
> > > + * is hooked to plane B. Hence we want plane A feeding pipe B.
> > > + */
> > > intel_crtc->pipe = pipe;
> > > intel_crtc->plane = pipe;
> > > - if (IS_MOBILE(dev) && IS_GEN3(dev)) {
> > > + if (IS_MOBILE(dev) && INTEL_INFO(dev)->gen < 4) {
> > > DRM_DEBUG_KMS("swapping pipes & planes for FBC\n");
> > > intel_crtc->plane = !pipe;
> > > }
> > > --
> > > 1.9.1
> >
>
--
Ville Syrjälä
Intel OTC
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