diff options
Diffstat (limited to 'drivers/gpu/drm/msm/mdp4/mdp4_irq.c')
| -rw-r--r-- | drivers/gpu/drm/msm/mdp4/mdp4_irq.c | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/drivers/gpu/drm/msm/mdp4/mdp4_irq.c b/drivers/gpu/drm/msm/mdp4/mdp4_irq.c new file mode 100644 index 000000000000..5c6b7fca4edd --- /dev/null +++ b/drivers/gpu/drm/msm/mdp4/mdp4_irq.c @@ -0,0 +1,203 @@ +/* + * Copyright (C) 2013 Red Hat + * Author: Rob Clark <robdclark@gmail.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program. If not, see <http://www.gnu.org/licenses/>. + */ + + +#include "msm_drv.h" +#include "mdp4_kms.h" + + +struct mdp4_irq_wait { + struct mdp4_irq irq; + int count; +}; + +static DECLARE_WAIT_QUEUE_HEAD(wait_event); + +static DEFINE_SPINLOCK(list_lock); + +static void update_irq(struct mdp4_kms *mdp4_kms) +{ + struct mdp4_irq *irq; + uint32_t irqmask = mdp4_kms->vblank_mask; + + BUG_ON(!spin_is_locked(&list_lock)); + + list_for_each_entry(irq, &mdp4_kms->irq_list, node) + irqmask |= irq->irqmask; + + mdp4_write(mdp4_kms, REG_MDP4_INTR_ENABLE, irqmask); +} + +static void update_irq_unlocked(struct mdp4_kms *mdp4_kms) +{ + unsigned long flags; + spin_lock_irqsave(&list_lock, flags); + update_irq(mdp4_kms); + spin_unlock_irqrestore(&list_lock, flags); +} + +static void mdp4_irq_error_handler(struct mdp4_irq *irq, uint32_t irqstatus) +{ + DRM_ERROR("errors: %08x\n", irqstatus); +} + +void mdp4_irq_preinstall(struct msm_kms *kms) +{ + struct mdp4_kms *mdp4_kms = to_mdp4_kms(kms); + mdp4_write(mdp4_kms, REG_MDP4_INTR_CLEAR, 0xffffffff); +} + +int mdp4_irq_postinstall(struct msm_kms *kms) +{ + struct mdp4_kms *mdp4_kms = to_mdp4_kms(kms); + struct mdp4_irq *error_handler = &mdp4_kms->error_handler; + + INIT_LIST_HEAD(&mdp4_kms->irq_list); + + error_handler->irq = mdp4_irq_error_handler; + error_handler->irqmask = MDP4_IRQ_PRIMARY_INTF_UDERRUN | + MDP4_IRQ_EXTERNAL_INTF_UDERRUN; + + mdp4_irq_register(mdp4_kms, error_handler); + + return 0; +} + +void mdp4_irq_uninstall(struct msm_kms *kms) +{ + struct mdp4_kms *mdp4_kms = to_mdp4_kms(kms); + mdp4_write(mdp4_kms, REG_MDP4_INTR_ENABLE, 0x00000000); +} + +irqreturn_t mdp4_irq(struct msm_kms *kms) +{ + struct mdp4_kms *mdp4_kms = to_mdp4_kms(kms); + struct drm_device *dev = mdp4_kms->dev; + struct msm_drm_private *priv = dev->dev_private; + struct mdp4_irq *handler, *n; + unsigned long flags; + unsigned int id; + uint32_t status; + + status = mdp4_read(mdp4_kms, REG_MDP4_INTR_STATUS); + mdp4_write(mdp4_kms, REG_MDP4_INTR_CLEAR, status); + + VERB("status=%08x", status); + + for (id = 0; id < priv->num_crtcs; id++) + if (status & mdp4_crtc_vblank(priv->crtcs[id])) + drm_handle_vblank(dev, id); + + spin_lock_irqsave(&list_lock, flags); + mdp4_kms->in_irq = true; + list_for_each_entry_safe(handler, n, &mdp4_kms->irq_list, node) { + if (handler->irqmask & status) { + spin_unlock_irqrestore(&list_lock, flags); + handler->irq(handler, handler->irqmask & status); + spin_lock_irqsave(&list_lock, flags); + } + } + mdp4_kms->in_irq = false; + update_irq(mdp4_kms); + spin_unlock_irqrestore(&list_lock, flags); + + return IRQ_HANDLED; +} + +int mdp4_enable_vblank(struct msm_kms *kms, struct drm_crtc *crtc) +{ + struct mdp4_kms *mdp4_kms = to_mdp4_kms(kms); + unsigned long flags; + + spin_lock_irqsave(&list_lock, flags); + mdp4_kms->vblank_mask |= mdp4_crtc_vblank(crtc); + update_irq(mdp4_kms); + spin_unlock_irqrestore(&list_lock, flags); + + return 0; +} + +void mdp4_disable_vblank(struct msm_kms *kms, struct drm_crtc *crtc) +{ + struct mdp4_kms *mdp4_kms = to_mdp4_kms(kms); + unsigned long flags; + + spin_lock_irqsave(&list_lock, flags); + mdp4_kms->vblank_mask &= ~mdp4_crtc_vblank(crtc); + update_irq(mdp4_kms); + spin_unlock_irqrestore(&list_lock, flags); +} + +static void wait_irq(struct mdp4_irq *irq, uint32_t irqstatus) +{ + struct mdp4_irq_wait *wait = + container_of(irq, struct mdp4_irq_wait, irq); + wait->count--; + wake_up_all(&wait_event); +} + +void mdp4_irq_wait(struct mdp4_kms *mdp4_kms, uint32_t irqmask) +{ + struct mdp4_irq_wait wait = { + .irq = { + .irq = wait_irq, + .irqmask = irqmask, + }, + .count = 1, + }; + mdp4_irq_register(mdp4_kms, &wait.irq); + wait_event(wait_event, (wait.count <= 0)); + mdp4_irq_unregister(mdp4_kms, &wait.irq); +} + +void mdp4_irq_register(struct mdp4_kms *mdp4_kms, struct mdp4_irq *irq) +{ + unsigned long flags; + bool needs_update = false; + + spin_lock_irqsave(&list_lock, flags); + + if (!irq->registered) { + irq->registered = true; + list_add(&irq->node, &mdp4_kms->irq_list); + needs_update = !mdp4_kms->in_irq; + } + + spin_unlock_irqrestore(&list_lock, flags); + + if (needs_update) + update_irq_unlocked(mdp4_kms); +} + +void mdp4_irq_unregister(struct mdp4_kms *mdp4_kms, struct mdp4_irq *irq) +{ + unsigned long flags; + bool needs_update = false; + + spin_lock_irqsave(&list_lock, flags); + + if (irq->registered) { + irq->registered = false; + list_del(&irq->node); + needs_update = !mdp4_kms->in_irq; + } + + spin_unlock_irqrestore(&list_lock, flags); + + if (needs_update) + update_irq_unlocked(mdp4_kms); +} |