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drm: Add get_scanout_position() to struct drm_crtc_helper_funcs

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The new callback get_scanout_position() reads the current location
of the scanout process. The operation is currently located in struct
drm_driver, but really belongs to the CRTC. Drivers will be converted
in separate patches.

To help with the conversion, the timestamp calculation has been
moved from drm_calc_vbltimestamp_from_scanoutpos() to
drm_crtc_vblank_helper_get_vblank_timestamp_internal(). The helper
function supports the new and old interface of get_scanout_position().
drm_calc_vbltimestamp_from_scanoutpos() remains as a wrapper around
the new function.

Callback functions return the scanout position from the CRTC. The
legacy version of the interface receives the device and pipe index,
the modern version receives a pointer to the CRTC. We keep the
legacy version until all drivers have been converted.

v4:
	* 80-character line fixes
v3:
	* refactor drm_calc_vbltimestamp_from_scanoutpos() to minimize
	  code duplication
	* define types for get_scanout_position() callbacks
v2:
	* fix logical op in drm_calc_vbltimestamp_from_scanoutpos()

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Tested-by: Yannick Fertré <yannick.fertre@st.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200123135943.24140-3-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann
2020-01-23 14:59:23 +01:00
parent 9e0e8f01c8
commit f1e2b6371c
4 changed files with 157 additions and 23 deletions
Download Patch File Download Diff File Expand all files Collapse all files

25
include/drm/drm_vblank.h
View File

@@ -239,4 +239,29 @@ void drm_calc_timestamping_constants(struct drm_crtc *crtc,
wait_queue_head_t *drm_crtc_vblank_waitqueue(struct drm_crtc *crtc);
void drm_crtc_set_max_vblank_count(struct drm_crtc *crtc,
u32 max_vblank_count);
typedef bool (*drm_vblank_get_scanout_position_func)(struct drm_crtc *crtc,
bool in_vblank_irq,
int *vpos, int *hpos,
ktime_t *stime,
ktime_t *etime,
const struct drm_display_mode *mode);
typedef bool (*drm_vblank_get_scanout_position_legacy_func)(struct drm_device *dev,
unsigned int pipe,
bool in_vblank_irq,
int *vpos,
int *hpos,
ktime_t *stime,
ktime_t *etime,
const struct drm_display_mode *mode);
bool
drm_crtc_vblank_helper_get_vblank_timestamp_internal(struct drm_crtc *crtc,
int *max_error,
ktime_t *vblank_time,
bool in_vblank_irq,
drm_vblank_get_scanout_position_func get_scanout_position,
drm_vblank_get_scanout_position_legacy_func get_scanout_position_legacy);
#endif