diff options
| -rw-r--r-- | drivers/gpu/drm/rockchip/analogix_dp-rockchip.c | 4 | ||||
| -rw-r--r-- | drivers/gpu/drm/rockchip/rockchip_drm_psr.c | 55 | ||||
| -rw-r--r-- | drivers/gpu/drm/rockchip/rockchip_drm_psr.h | 4 |
3 files changed, 46 insertions, 17 deletions
diff --git a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c index 6d45d62466b3..080f05352195 100644 --- a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c +++ b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c @@ -134,7 +134,7 @@ static int rockchip_dp_poweron_end(struct analogix_dp_plat_data *plat_data) { struct rockchip_dp_device *dp = to_dp(plat_data); - return rockchip_drm_psr_activate(&dp->encoder); + return rockchip_drm_psr_inhibit_put(&dp->encoder); } static int rockchip_dp_powerdown(struct analogix_dp_plat_data *plat_data) @@ -142,7 +142,7 @@ static int rockchip_dp_powerdown(struct analogix_dp_plat_data *plat_data) struct rockchip_dp_device *dp = to_dp(plat_data); int ret; - ret = rockchip_drm_psr_deactivate(&dp->encoder); + ret = rockchip_drm_psr_inhibit_get(&dp->encoder); if (ret != 0) return ret; diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_psr.c b/drivers/gpu/drm/rockchip/rockchip_drm_psr.c index 1a6157ffecec..74f6a6a887dd 100644 --- a/drivers/gpu/drm/rockchip/rockchip_drm_psr.c +++ b/drivers/gpu/drm/rockchip/rockchip_drm_psr.c @@ -25,7 +25,7 @@ struct psr_drv { struct drm_encoder *encoder; struct mutex lock; - bool active; + int inhibit_count; bool enabled; struct delayed_work flush_work; @@ -71,7 +71,7 @@ static int psr_set_state_locked(struct psr_drv *psr, bool enable) { int ret; - if (!psr->active) + if (psr->inhibit_count > 0) return -EINVAL; if (enable == psr->enabled) @@ -96,13 +96,18 @@ static void psr_flush_handler(struct work_struct *work) } /** - * rockchip_drm_psr_activate - activate PSR on the given pipe + * rockchip_drm_psr_inhibit_put - release PSR inhibit on given encoder * @encoder: encoder to obtain the PSR encoder * + * Decrements PSR inhibit count on given encoder. Should be called only + * for a PSR inhibit count increment done before. If PSR inhibit counter + * reaches zero, PSR flush work is scheduled to make the hardware enter + * PSR mode in PSR_FLUSH_TIMEOUT_MS. + * * Returns: * Zero on success, negative errno on failure. */ -int rockchip_drm_psr_activate(struct drm_encoder *encoder) +int rockchip_drm_psr_inhibit_put(struct drm_encoder *encoder) { struct psr_drv *psr = find_psr_by_encoder(encoder); @@ -110,21 +115,30 @@ int rockchip_drm_psr_activate(struct drm_encoder *encoder) return PTR_ERR(psr); mutex_lock(&psr->lock); - psr->active = true; + --psr->inhibit_count; + WARN_ON(psr->inhibit_count < 0); + if (!psr->inhibit_count) + mod_delayed_work(system_wq, &psr->flush_work, + PSR_FLUSH_TIMEOUT_MS); mutex_unlock(&psr->lock); return 0; } -EXPORT_SYMBOL(rockchip_drm_psr_activate); +EXPORT_SYMBOL(rockchip_drm_psr_inhibit_put); /** - * rockchip_drm_psr_deactivate - deactivate PSR on the given pipe + * rockchip_drm_psr_inhibit_get - acquire PSR inhibit on given encoder * @encoder: encoder to obtain the PSR encoder * + * Increments PSR inhibit count on given encoder. This function guarantees + * that after it returns PSR is turned off on given encoder and no PSR-related + * hardware state change occurs at least until a matching call to + * rockchip_drm_psr_inhibit_put() is done. + * * Returns: * Zero on success, negative errno on failure. */ -int rockchip_drm_psr_deactivate(struct drm_encoder *encoder) +int rockchip_drm_psr_inhibit_get(struct drm_encoder *encoder) { struct psr_drv *psr = find_psr_by_encoder(encoder); @@ -132,14 +146,14 @@ int rockchip_drm_psr_deactivate(struct drm_encoder *encoder) return PTR_ERR(psr); mutex_lock(&psr->lock); - psr->active = false; - psr->enabled = false; + psr_set_state_locked(psr, false); + ++psr->inhibit_count; mutex_unlock(&psr->lock); cancel_delayed_work_sync(&psr->flush_work); return 0; } -EXPORT_SYMBOL(rockchip_drm_psr_deactivate); +EXPORT_SYMBOL(rockchip_drm_psr_inhibit_get); static void rockchip_drm_do_flush(struct psr_drv *psr) { @@ -199,6 +213,11 @@ EXPORT_SYMBOL(rockchip_drm_psr_flush_all); * @encoder: encoder that obtain the PSR function * @psr_set: call back to set PSR state * + * The function returns with PSR inhibit counter initialized with one + * and the caller (typically encoder driver) needs to call + * rockchip_drm_psr_inhibit_put() when it becomes ready to accept PSR + * enable request. + * * Returns: * Zero on success, negative errno on failure. */ @@ -218,7 +237,7 @@ int rockchip_drm_psr_register(struct drm_encoder *encoder, INIT_DELAYED_WORK(&psr->flush_work, psr_flush_handler); mutex_init(&psr->lock); - psr->active = false; + psr->inhibit_count = 1; psr->enabled = false; psr->encoder = encoder; psr->set = psr_set; @@ -236,6 +255,11 @@ EXPORT_SYMBOL(rockchip_drm_psr_register); * @encoder: encoder that obtain the PSR function * @psr_set: call back to set PSR state * + * It is expected that the PSR inhibit counter is 1 when this function is + * called, which corresponds to a state when related encoder has been + * disconnected from any CRTCs and its driver called + * rockchip_drm_psr_inhibit_get() to stop the PSR logic. + * * Returns: * Zero on success, negative errno on failure. */ @@ -247,7 +271,12 @@ void rockchip_drm_psr_unregister(struct drm_encoder *encoder) mutex_lock(&drm_drv->psr_list_lock); list_for_each_entry_safe(psr, n, &drm_drv->psr_list, list) { if (psr->encoder == encoder) { - cancel_delayed_work_sync(&psr->flush_work); + /* + * Any other value would mean that the encoder + * is still in use. + */ + WARN_ON(psr->inhibit_count != 1); + list_del(&psr->list); kfree(psr); } diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_psr.h b/drivers/gpu/drm/rockchip/rockchip_drm_psr.h index 06537ee27565..40e026c14168 100644 --- a/drivers/gpu/drm/rockchip/rockchip_drm_psr.h +++ b/drivers/gpu/drm/rockchip/rockchip_drm_psr.h @@ -18,8 +18,8 @@ void rockchip_drm_psr_flush_all(struct drm_device *dev); int rockchip_drm_psr_flush(struct drm_crtc *crtc); -int rockchip_drm_psr_activate(struct drm_encoder *encoder); -int rockchip_drm_psr_deactivate(struct drm_encoder *encoder); +int rockchip_drm_psr_inhibit_put(struct drm_encoder *encoder); +int rockchip_drm_psr_inhibit_get(struct drm_encoder *encoder); int rockchip_drm_psr_register(struct drm_encoder *encoder, int (*psr_set)(struct drm_encoder *, bool enable)); |