diff options
| author | Rob Clark <robdclark@chromium.org> | 2022-03-04 12:21:45 -0800 |
|---|---|---|
| committer | Rob Clark <robdclark@chromium.org> | 2022-03-06 19:28:47 -0800 |
| commit | 9225b337072a10bf9b09df8bf281437488dd8a26 (patch) | |
| tree | 831488dfa5cafa9e8c5976e9e49d489591d4819d /drivers/gpu/drm/msm/msm_fb.c | |
| parent | cca96584b35765bf9eb5f38ca55a144ea2ba0de4 (diff) | |
| download | linux-9225b337072a10bf9b09df8bf281437488dd8a26.tar.bz2 | |
drm/msm: Fix dirtyfb refcounting
refcount_t complains about 0->1 transitions, which isn't *quite* what we
wanted. So use dirtyfb==1 to mean that the fb is not connected to any
output that requires dirtyfb flushing, so that we can keep the underflow
and overflow checking.
Fixes: 9e4dde28e9cd ("drm/msm: Avoid dirtyfb stalls on video mode displays (v2)")
Signed-off-by: Rob Clark <robdclark@chromium.org>
Link: https://lore.kernel.org/r/20220304202146.845566-1-robdclark@gmail.com
Diffstat (limited to 'drivers/gpu/drm/msm/msm_fb.c')
| -rw-r--r-- | drivers/gpu/drm/msm/msm_fb.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/gpu/drm/msm/msm_fb.c b/drivers/gpu/drm/msm/msm_fb.c index 96b379a08327..7137492fe78e 100644 --- a/drivers/gpu/drm/msm/msm_fb.c +++ b/drivers/gpu/drm/msm/msm_fb.c @@ -37,7 +37,7 @@ static int msm_framebuffer_dirtyfb(struct drm_framebuffer *fb, /* If this fb is not used on any display requiring pixel data to be * flushed, then skip dirtyfb */ - if (refcount_read(&msm_fb->dirtyfb) == 0) + if (refcount_read(&msm_fb->dirtyfb) == 1) return 0; return drm_atomic_helper_dirtyfb(fb, file_priv, flags, color, @@ -221,6 +221,8 @@ static struct drm_framebuffer *msm_framebuffer_init(struct drm_device *dev, goto fail; } + refcount_set(&msm_fb->dirtyfb, 1); + drm_dbg_state(dev, "create: FB ID: %d (%p)", fb->base.id, fb); return fb; |