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authorDaniel Vetter <daniel.vetter@ffwll.ch>2017-05-09 17:03:25 +0300
committerDaniel Vetter <daniel.vetter@ffwll.ch>2017-05-10 11:21:08 +0300
commitd673c02c4bdbcbe3076a2680f9c954be26b525c8 (patch)
tree6a3535fa5b309037993de557aaf8360caee0281e /include/drm
parent315f0242aa2b1e999bc1211123f7b6664068dba4 (diff)
downloadlinux-d673c02c4bdbcbe3076a2680f9c954be26b525c8.tar.xz
drm/vblank: Switch drm_driver->get_vblank_timestamp to return a bool
There's really no reason for anything more: - Calling this while the crtc vblank stuff isn't set up is a driver bug. Those places alrready DRM_ERROR. - Calling this when the crtc is off is either a driver bug (calling drm_crtc_handle_vblank at the wrong time) or a core bug (for anything else). Again, we DRM_ERROR. - EINVAL is checked at higher levels already, and if we'd use struct drm_crtc * instead of (dev, pipe) it would be real obvious that those are again core bugs. The only valid failure mode is crap hardware that couldn't sample a useful timestamp, to ask the core to just grab a not-so-accurate timestamp. Bool is perfectly fine for that. v2: Also fix up the one caller, I lost that in the shuffling (Jani). v3: Fixup commit message (Neil). Cc: Jani Nikula <jani.nikula@linux.intel.com> Cc: Mario Kleiner <mario.kleiner@tuebingen.mpg.de> Cc: Eric Anholt <eric@anholt.net> Cc: Rob Clark <robdclark@gmail.com> Cc: linux-arm-msm@vger.kernel.org Cc: freedreno@lists.freedesktop.org Cc: Alex Deucher <alexander.deucher@amd.com> Cc: Christian König <christian.koenig@amd.com> Cc: Ben Skeggs <bskeggs@redhat.com> Reviewed-by: Neil Armstrong <narmstrong@baylibre.com> Acked-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170509140329.24114-1-daniel.vetter@ffwll.ch
Diffstat (limited to 'include/drm')
-rw-r--r--include/drm/drmP.h1
-rw-r--r--include/drm/drm_drv.h7
-rw-r--r--include/drm/drm_irq.h10
3 files changed, 8 insertions, 10 deletions
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index e1daa4f343cd..a1b19bf45fb3 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -322,7 +322,6 @@ struct pci_controller;
/* Flags and return codes for get_vblank_timestamp() driver function. */
#define DRM_CALLED_FROM_VBLIRQ 1
-#define DRM_VBLANKTIME_SCANOUTPOS_METHOD (1 << 0)
/* get_scanout_position() return flags */
#define DRM_SCANOUTPOS_VALID (1 << 0)
diff --git a/include/drm/drm_drv.h b/include/drm/drm_drv.h
index d0b5f363bfa1..da78e248d9d8 100644
--- a/include/drm/drm_drv.h
+++ b/include/drm/drm_drv.h
@@ -316,11 +316,10 @@ struct drm_driver {
*
* Returns:
*
- * Zero if timestamping isn't supported in current display mode or a
- * negative number on failure. A positive status code on success,
- * which describes how the vblank_time timestamp was computed.
+ * True on success, false on failure, which means the core should
+ * fallback to a simple timestamp taken in drm_crtc_handle_vblank().
*/
- int (*get_vblank_timestamp) (struct drm_device *dev, unsigned int pipe,
+ bool (*get_vblank_timestamp) (struct drm_device *dev, unsigned int pipe,
int *max_error,
struct timeval *vblank_time,
unsigned flags);
diff --git a/include/drm/drm_irq.h b/include/drm/drm_irq.h
index cf0be6594c8c..f0d5ccf9b282 100644
--- a/include/drm/drm_irq.h
+++ b/include/drm/drm_irq.h
@@ -153,11 +153,11 @@ void drm_crtc_vblank_on(struct drm_crtc *crtc);
void drm_vblank_cleanup(struct drm_device *dev);
u32 drm_accurate_vblank_count(struct drm_crtc *crtc);
-int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
- unsigned int pipe, int *max_error,
- struct timeval *vblank_time,
- unsigned flags,
- const struct drm_display_mode *mode);
+bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
+ unsigned int pipe, int *max_error,
+ struct timeval *vblank_time,
+ unsigned flags,
+ const struct drm_display_mode *mode);
void drm_calc_timestamping_constants(struct drm_crtc *crtc,
const struct drm_display_mode *mode);