diff options
Diffstat (limited to 'drivers/gpu/drm/drm_vblank.c')
| -rw-r--r-- | drivers/gpu/drm/drm_vblank.c | 81 |
1 files changed, 59 insertions, 22 deletions
diff --git a/drivers/gpu/drm/drm_vblank.c b/drivers/gpu/drm/drm_vblank.c index cc3571e25a9a..c6b4cd77df72 100644 --- a/drivers/gpu/drm/drm_vblank.c +++ b/drivers/gpu/drm/drm_vblank.c @@ -131,7 +131,7 @@ * guaranteed to be enabled. * * On many hardware disabling the vblank interrupt cannot be done in a race-free - * manner, see &drm_driver.vblank_disable_immediate and + * manner, see &drm_vblank_crtc_config.disable_immediate and * &drm_driver.max_vblank_count. In that case the vblank core only disables the * vblanks after a timer has expired, which can be configured through the * ``vblankoffdelay`` module parameter. @@ -1241,6 +1241,7 @@ EXPORT_SYMBOL(drm_crtc_vblank_get); void drm_vblank_put(struct drm_device *dev, unsigned int pipe) { struct drm_vblank_crtc *vblank = drm_vblank_crtc(dev, pipe); + int vblank_offdelay = vblank->config.offdelay_ms; if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)) return; @@ -1250,13 +1251,13 @@ void drm_vblank_put(struct drm_device *dev, unsigned int pipe) /* Last user schedules interrupt disable */ if (atomic_dec_and_test(&vblank->refcount)) { - if (drm_vblank_offdelay == 0) + if (!vblank_offdelay) return; - else if (drm_vblank_offdelay < 0) + else if (vblank_offdelay < 0) vblank_disable_fn(&vblank->disable_timer); - else if (!dev->vblank_disable_immediate) + else if (!vblank->config.disable_immediate) mod_timer(&vblank->disable_timer, - jiffies + ((drm_vblank_offdelay * HZ)/1000)); + jiffies + ((vblank_offdelay * HZ) / 1000)); } } @@ -1265,7 +1266,8 @@ void drm_vblank_put(struct drm_device *dev, unsigned int pipe) * @crtc: which counter to give up * * Release ownership of a given vblank counter, turning off interrupts - * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. + * if possible. Disable interrupts after &drm_vblank_crtc_config.offdelay_ms + * milliseconds. */ void drm_crtc_vblank_put(struct drm_crtc *crtc) { @@ -1466,16 +1468,20 @@ void drm_crtc_set_max_vblank_count(struct drm_crtc *crtc, EXPORT_SYMBOL(drm_crtc_set_max_vblank_count); /** - * drm_crtc_vblank_on - enable vblank events on a CRTC + * drm_crtc_vblank_on_config - enable vblank events on a CRTC with custom + * configuration options * @crtc: CRTC in question + * @config: Vblank configuration value * - * This functions restores the vblank interrupt state captured with - * drm_crtc_vblank_off() again and is generally called when enabling @crtc. Note - * that calls to drm_crtc_vblank_on() and drm_crtc_vblank_off() can be - * unbalanced and so can also be unconditionally called in driver load code to - * reflect the current hardware state of the crtc. + * See drm_crtc_vblank_on(). In addition, this function allows you to provide a + * custom vblank configuration for a given CRTC. + * + * Note that @config is copied, the pointer does not need to stay valid beyond + * this function call. For details of the parameters see + * struct drm_vblank_crtc_config. */ -void drm_crtc_vblank_on(struct drm_crtc *crtc) +void drm_crtc_vblank_on_config(struct drm_crtc *crtc, + const struct drm_vblank_crtc_config *config) { struct drm_device *dev = crtc->dev; unsigned int pipe = drm_crtc_index(crtc); @@ -1488,6 +1494,8 @@ void drm_crtc_vblank_on(struct drm_crtc *crtc) drm_dbg_vbl(dev, "crtc %d, vblank enabled %d, inmodeset %d\n", pipe, vblank->enabled, vblank->inmodeset); + vblank->config = *config; + /* Drop our private "prevent drm_vblank_get" refcount */ if (vblank->inmodeset) { atomic_dec(&vblank->refcount); @@ -1500,10 +1508,33 @@ void drm_crtc_vblank_on(struct drm_crtc *crtc) * re-enable interrupts if there are users left, or the * user wishes vblank interrupts to be enabled all the time. */ - if (atomic_read(&vblank->refcount) != 0 || drm_vblank_offdelay == 0) + if (atomic_read(&vblank->refcount) != 0 || !vblank->config.offdelay_ms) drm_WARN_ON(dev, drm_vblank_enable(dev, pipe)); spin_unlock_irq(&dev->vbl_lock); } +EXPORT_SYMBOL(drm_crtc_vblank_on_config); + +/** + * drm_crtc_vblank_on - enable vblank events on a CRTC + * @crtc: CRTC in question + * + * This functions restores the vblank interrupt state captured with + * drm_crtc_vblank_off() again and is generally called when enabling @crtc. Note + * that calls to drm_crtc_vblank_on() and drm_crtc_vblank_off() can be + * unbalanced and so can also be unconditionally called in driver load code to + * reflect the current hardware state of the crtc. + * + * Note that unlike in drm_crtc_vblank_on_config(), default values are used. + */ +void drm_crtc_vblank_on(struct drm_crtc *crtc) +{ + const struct drm_vblank_crtc_config config = { + .offdelay_ms = drm_vblank_offdelay, + .disable_immediate = crtc->dev->vblank_disable_immediate + }; + + drm_crtc_vblank_on_config(crtc, &config); +} EXPORT_SYMBOL(drm_crtc_vblank_on); static void drm_vblank_restore(struct drm_device *dev, unsigned int pipe) @@ -1556,16 +1587,21 @@ static void drm_vblank_restore(struct drm_device *dev, unsigned int pipe) * * Note that drivers must have race-free high-precision timestamping support, * i.e. &drm_crtc_funcs.get_vblank_timestamp must be hooked up and - * &drm_driver.vblank_disable_immediate must be set to indicate the + * &drm_vblank_crtc_config.disable_immediate must be set to indicate the * time-stamping functions are race-free against vblank hardware counter * increments. */ void drm_crtc_vblank_restore(struct drm_crtc *crtc) { - WARN_ON_ONCE(!crtc->funcs->get_vblank_timestamp); - WARN_ON_ONCE(!crtc->dev->vblank_disable_immediate); + struct drm_device *dev = crtc->dev; + unsigned int pipe = drm_crtc_index(crtc); + struct drm_vblank_crtc *vblank = drm_vblank_crtc(dev, pipe); + + drm_WARN_ON_ONCE(dev, !crtc->funcs->get_vblank_timestamp); + drm_WARN_ON_ONCE(dev, vblank->inmodeset); + drm_WARN_ON_ONCE(dev, !vblank->config.disable_immediate); - drm_vblank_restore(crtc->dev, drm_crtc_index(crtc)); + drm_vblank_restore(dev, pipe); } EXPORT_SYMBOL(drm_crtc_vblank_restore); @@ -1754,7 +1790,7 @@ int drm_wait_vblank_ioctl(struct drm_device *dev, void *data, /* If the counter is currently enabled and accurate, short-circuit * queries to return the cached timestamp of the last vblank. */ - if (dev->vblank_disable_immediate && + if (vblank->config.disable_immediate && drm_wait_vblank_is_query(vblwait) && READ_ONCE(vblank->enabled)) { drm_wait_vblank_reply(dev, pipe, &vblwait->reply); @@ -1918,8 +1954,8 @@ bool drm_handle_vblank(struct drm_device *dev, unsigned int pipe) * been signaled. The disable has to be last (after * drm_handle_vblank_events) so that the timestamp is always accurate. */ - disable_irq = (dev->vblank_disable_immediate && - drm_vblank_offdelay > 0 && + disable_irq = (vblank->config.disable_immediate && + vblank->config.offdelay_ms > 0 && !atomic_read(&vblank->refcount)); drm_handle_vblank_events(dev, pipe); @@ -1992,7 +2028,8 @@ int drm_crtc_get_sequence_ioctl(struct drm_device *dev, void *data, pipe = drm_crtc_index(crtc); vblank = drm_crtc_vblank_crtc(crtc); - vblank_enabled = dev->vblank_disable_immediate && READ_ONCE(vblank->enabled); + vblank_enabled = READ_ONCE(vblank->config.disable_immediate) && + READ_ONCE(vblank->enabled); if (!vblank_enabled) { ret = drm_crtc_vblank_get(crtc); |