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drm: Add get_scanout_position() to struct drm_crtc_helper_funcs
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
parent
9e0e8f01c8
commit
f1e2b6371c
@ -30,6 +30,7 @@
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#include <drm/drm_crtc.h>
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#include <drm/drm_drv.h>
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#include <drm/drm_framebuffer.h>
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#include <drm/drm_modeset_helper_vtables.h>
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#include <drm/drm_print.h>
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#include <drm/drm_vblank.h>
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@ -605,7 +606,7 @@ EXPORT_SYMBOL(drm_calc_timestamping_constants);
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* Implements calculation of exact vblank timestamps from given drm_display_mode
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* timings and current video scanout position of a CRTC. This can be directly
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* used as the &drm_driver.get_vblank_timestamp implementation of a kms driver
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* if &drm_driver.get_scanout_position is implemented.
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* if &drm_crtc_helper_funcs.get_scanout_position is implemented.
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*
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* The current implementation only handles standard video modes. For double scan
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* and interlaced modes the driver is supposed to adjust the hardware mode
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@ -627,28 +628,85 @@ bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
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ktime_t *vblank_time,
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bool in_vblank_irq)
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{
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struct timespec64 ts_etime, ts_vblank_time;
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ktime_t stime, etime;
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bool vbl_status;
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struct drm_crtc *crtc;
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const struct drm_display_mode *mode;
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struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
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int vpos, hpos, i;
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int delta_ns, duration_ns;
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if (!drm_core_check_feature(dev, DRIVER_MODESET))
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return false;
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crtc = drm_crtc_from_index(dev, pipe);
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if (!crtc)
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return false;
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if (pipe >= dev->num_crtcs || !crtc) {
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return drm_crtc_vblank_helper_get_vblank_timestamp_internal(crtc,
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max_error,
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vblank_time,
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in_vblank_irq,
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crtc->helper_private->get_scanout_position,
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dev->driver->get_scanout_position);
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}
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EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos);
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/**
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* drm_crtc_vblank_helper_get_vblank_timestamp_internal - precise vblank
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* timestamp helper
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* @dev: DRM device
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* @pipe: index of CRTC whose vblank timestamp to retrieve
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* @max_error: Desired maximum allowable error in timestamps (nanosecs)
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* On return contains true maximum error of timestamp
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* @vblank_time: Pointer to time which should receive the timestamp
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* @in_vblank_irq:
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* True when called from drm_crtc_handle_vblank(). Some drivers
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* need to apply some workarounds for gpu-specific vblank irq quirks
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* if flag is set.
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* @get_scanout_position:
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* Callback function to retrieve the scanout position. See
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* @struct drm_crtc_helper_funcs.get_scanout_position.
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* @get_scanout_position_legacy:
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* Callback function to retrieve the scanout position. See
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* @struct drm_driver.get_scanout_position.
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*
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* Implements calculation of exact vblank timestamps from given drm_display_mode
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* timings and current video scanout position of a CRTC.
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*
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* The current implementation only handles standard video modes. For double scan
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* and interlaced modes the driver is supposed to adjust the hardware mode
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* (taken from &drm_crtc_state.adjusted mode for atomic modeset drivers) to
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* match the scanout position reported.
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*
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* Note that atomic drivers must call drm_calc_timestamping_constants() before
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* enabling a CRTC. The atomic helpers already take care of that in
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* drm_atomic_helper_update_legacy_modeset_state().
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*
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* Returns:
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*
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* Returns true on success, and false on failure, i.e. when no accurate
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* timestamp could be acquired.
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*/
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bool
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drm_crtc_vblank_helper_get_vblank_timestamp_internal(
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struct drm_crtc *crtc, int *max_error, ktime_t *vblank_time,
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bool in_vblank_irq,
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drm_vblank_get_scanout_position_func get_scanout_position,
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drm_vblank_get_scanout_position_legacy_func get_scanout_position_legacy)
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{
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struct drm_device *dev = crtc->dev;
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unsigned int pipe = crtc->index;
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struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
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struct timespec64 ts_etime, ts_vblank_time;
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ktime_t stime, etime;
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bool vbl_status;
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const struct drm_display_mode *mode;
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int vpos, hpos, i;
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int delta_ns, duration_ns;
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if (pipe >= dev->num_crtcs) {
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DRM_ERROR("Invalid crtc %u\n", pipe);
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return false;
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}
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/* Scanout position query not supported? Should not happen. */
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if (!dev->driver->get_scanout_position) {
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DRM_ERROR("Called from driver w/o get_scanout_position()!?\n");
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if (!get_scanout_position && !get_scanout_position_legacy) {
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DRM_ERROR("Called from CRTC w/o get_scanout_position()!?\n");
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return false;
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}
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@ -663,7 +721,6 @@ bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
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if (mode->crtc_clock == 0) {
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DRM_DEBUG("crtc %u: Noop due to uninitialized mode.\n", pipe);
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WARN_ON_ONCE(drm_drv_uses_atomic_modeset(dev));
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return false;
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}
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@ -679,11 +736,19 @@ bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
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* Get vertical and horizontal scanout position vpos, hpos,
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* and bounding timestamps stime, etime, pre/post query.
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*/
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vbl_status = dev->driver->get_scanout_position(dev, pipe,
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if (get_scanout_position) {
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vbl_status = get_scanout_position(crtc,
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in_vblank_irq,
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&vpos, &hpos,
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&stime, &etime,
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mode);
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} else {
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vbl_status = get_scanout_position_legacy(dev, pipe,
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in_vblank_irq,
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&vpos, &hpos,
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&stime, &etime,
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mode);
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}
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/* Return as no-op if scanout query unsupported or failed. */
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if (!vbl_status) {
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@ -735,7 +800,7 @@ bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
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return true;
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}
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EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos);
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EXPORT_SYMBOL(drm_crtc_vblank_helper_get_vblank_timestamp_internal);
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/**
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* drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent
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@ -362,11 +362,8 @@ struct drm_driver {
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* True on success, false if a reliable scanout position counter could
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* not be read out.
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*
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* FIXME:
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*
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* Since this is a helper to implement @get_vblank_timestamp, we should
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* move it to &struct drm_crtc_helper_funcs, like all the other
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* helper-internal hooks.
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* This is deprecated and should not be used by new drivers.
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* Use &drm_crtc_helper_funcs.get_scanout_position instead.
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*/
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bool (*get_scanout_position) (struct drm_device *dev, unsigned int pipe,
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bool in_vblank_irq, int *vpos, int *hpos,
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@ -450,6 +450,53 @@ struct drm_crtc_helper_funcs {
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*/
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void (*atomic_disable)(struct drm_crtc *crtc,
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struct drm_crtc_state *old_crtc_state);
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/**
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* @get_scanout_position:
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*
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* Called by vblank timestamping code.
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*
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* Returns the current display scanout position from a CRTC and an
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* optional accurate ktime_get() timestamp of when the position was
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* measured. Note that this is a helper callback which is only used
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* if a driver uses drm_calc_vbltimestamp_from_scanoutpos() for the
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* @drm_driver.get_vblank_timestamp callback.
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*
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* Parameters:
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*
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* crtc:
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* The CRTC.
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* in_vblank_irq:
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* True when called from drm_crtc_handle_vblank(). Some drivers
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* need to apply some workarounds for gpu-specific vblank irq
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* quirks if the flag is set.
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* vpos:
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* Target location for current vertical scanout position.
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* hpos:
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* Target location for current horizontal scanout position.
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* stime:
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* Target location for timestamp taken immediately before
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* scanout position query. Can be NULL to skip timestamp.
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* etime:
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* Target location for timestamp taken immediately after
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* scanout position query. Can be NULL to skip timestamp.
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* mode:
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* Current display timings.
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*
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* Returns vpos as a positive number while in active scanout area.
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* Returns vpos as a negative number inside vblank, counting the number
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* of scanlines to go until end of vblank, e.g., -1 means "one scanline
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* until start of active scanout / end of vblank."
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*
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* Returns:
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*
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* True on success, false if a reliable scanout position counter could
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* not be read out.
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*/
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bool (*get_scanout_position)(struct drm_crtc *crtc,
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bool in_vblank_irq, int *vpos, int *hpos,
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ktime_t *stime, ktime_t *etime,
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const struct drm_display_mode *mode);
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};
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/**
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@ -239,4 +239,29 @@ void drm_calc_timestamping_constants(struct drm_crtc *crtc,
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wait_queue_head_t *drm_crtc_vblank_waitqueue(struct drm_crtc *crtc);
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void drm_crtc_set_max_vblank_count(struct drm_crtc *crtc,
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u32 max_vblank_count);
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typedef bool (*drm_vblank_get_scanout_position_func)(struct drm_crtc *crtc,
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bool in_vblank_irq,
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int *vpos, int *hpos,
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ktime_t *stime,
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ktime_t *etime,
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const struct drm_display_mode *mode);
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typedef bool (*drm_vblank_get_scanout_position_legacy_func)(struct drm_device *dev,
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unsigned int pipe,
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bool in_vblank_irq,
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int *vpos,
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int *hpos,
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ktime_t *stime,
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ktime_t *etime,
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const struct drm_display_mode *mode);
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bool
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drm_crtc_vblank_helper_get_vblank_timestamp_internal(struct drm_crtc *crtc,
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int *max_error,
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ktime_t *vblank_time,
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bool in_vblank_irq,
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drm_vblank_get_scanout_position_func get_scanout_position,
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drm_vblank_get_scanout_position_legacy_func get_scanout_position_legacy);
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#endif
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