blob: 013b0bba712ffa914d5d25cc4eebcf6075dccea4 [file] [log] [blame]
/*
* drivers/gpu/drm/omapdrm/omap_irq.c
*
* Copyright (C) 2012 Texas Instruments
* Author: Rob Clark <rob.clark@linaro.org>
*
* 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 "omap_drv.h"
struct omap_irq_wait {
struct list_head node;
wait_queue_head_t wq;
uint32_t irqmask;
int count;
};
/* call with wait_lock and dispc runtime held */
static void omap_irq_update(struct drm_device *dev)
{
struct omap_drm_private *priv = dev->dev_private;
struct omap_irq_wait *wait;
uint32_t irqmask = priv->irq_mask;
assert_spin_locked(&priv->wait_lock);
list_for_each_entry(wait, &priv->wait_list, node)
irqmask |= wait->irqmask;
DBG("irqmask=%08x", irqmask);
priv->dispc_ops->write_irqenable(irqmask);
}
static void omap_irq_wait_handler(struct omap_irq_wait *wait)
{
wait->count--;
wake_up(&wait->wq);
}
struct omap_irq_wait * omap_irq_wait_init(struct drm_device *dev,
uint32_t irqmask, int count)
{
struct omap_drm_private *priv = dev->dev_private;
struct omap_irq_wait *wait = kzalloc(sizeof(*wait), GFP_KERNEL);
unsigned long flags;
init_waitqueue_head(&wait->wq);
wait->irqmask = irqmask;
wait->count = count;
spin_lock_irqsave(&priv->wait_lock, flags);
list_add(&wait->node, &priv->wait_list);
omap_irq_update(dev);
spin_unlock_irqrestore(&priv->wait_lock, flags);
return wait;
}
int omap_irq_wait(struct drm_device *dev, struct omap_irq_wait *wait,
unsigned long timeout)
{
struct omap_drm_private *priv = dev->dev_private;
unsigned long flags;
int ret;
ret = wait_event_timeout(wait->wq, (wait->count <= 0), timeout);
spin_lock_irqsave(&priv->wait_lock, flags);
list_del(&wait->node);
omap_irq_update(dev);
spin_unlock_irqrestore(&priv->wait_lock, flags);
kfree(wait);
return ret == 0 ? -1 : 0;
}
/**
* enable_vblank - enable vblank interrupt events
* @dev: DRM device
* @pipe: which irq to enable
*
* Enable vblank interrupts for @crtc. If the device doesn't have
* a hardware vblank counter, this routine should be a no-op, since
* interrupts will have to stay on to keep the count accurate.
*
* RETURNS
* Zero on success, appropriate errno if the given @crtc's vblank
* interrupt cannot be enabled.
*/
int omap_irq_enable_vblank(struct drm_crtc *crtc)
{
struct drm_device *dev = crtc->dev;
struct omap_drm_private *priv = dev->dev_private;
unsigned long flags;
enum omap_channel channel = omap_crtc_channel(crtc);
DBG("dev=%p, crtc=%u", dev, channel);
spin_lock_irqsave(&priv->wait_lock, flags);
priv->irq_mask |= priv->dispc_ops->mgr_get_vsync_irq(channel);
omap_irq_update(dev);
spin_unlock_irqrestore(&priv->wait_lock, flags);
return 0;
}
/**
* disable_vblank - disable vblank interrupt events
* @dev: DRM device
* @pipe: which irq to enable
*
* Disable vblank interrupts for @crtc. If the device doesn't have
* a hardware vblank counter, this routine should be a no-op, since
* interrupts will have to stay on to keep the count accurate.
*/
void omap_irq_disable_vblank(struct drm_crtc *crtc)
{
struct drm_device *dev = crtc->dev;
struct omap_drm_private *priv = dev->dev_private;
unsigned long flags;
enum omap_channel channel = omap_crtc_channel(crtc);
DBG("dev=%p, crtc=%u", dev, channel);
spin_lock_irqsave(&priv->wait_lock, flags);
priv->irq_mask &= ~priv->dispc_ops->mgr_get_vsync_irq(channel);
omap_irq_update(dev);
spin_unlock_irqrestore(&priv->wait_lock, flags);
}
static void omap_irq_fifo_underflow(struct omap_drm_private *priv,
u32 irqstatus)
{
static DEFINE_RATELIMIT_STATE(_rs, DEFAULT_RATELIMIT_INTERVAL,
DEFAULT_RATELIMIT_BURST);
static const struct {
const char *name;
u32 mask;
} sources[] = {
{ "gfx", DISPC_IRQ_GFX_FIFO_UNDERFLOW },
{ "vid1", DISPC_IRQ_VID1_FIFO_UNDERFLOW },
{ "vid2", DISPC_IRQ_VID2_FIFO_UNDERFLOW },
{ "vid3", DISPC_IRQ_VID3_FIFO_UNDERFLOW },
};
const u32 mask = DISPC_IRQ_GFX_FIFO_UNDERFLOW
| DISPC_IRQ_VID1_FIFO_UNDERFLOW
| DISPC_IRQ_VID2_FIFO_UNDERFLOW
| DISPC_IRQ_VID3_FIFO_UNDERFLOW;
unsigned int i;
spin_lock(&priv->wait_lock);
irqstatus &= priv->irq_mask & mask;
spin_unlock(&priv->wait_lock);
if (!irqstatus)
return;
if (!__ratelimit(&_rs))
return;
DRM_ERROR("FIFO underflow on ");
for (i = 0; i < ARRAY_SIZE(sources); ++i) {
if (sources[i].mask & irqstatus)
pr_cont("%s ", sources[i].name);
}
pr_cont("(0x%08x)\n", irqstatus);
}
static void omap_irq_ocp_error_handler(struct drm_device *dev,
u32 irqstatus)
{
if (!(irqstatus & DISPC_IRQ_OCP_ERR))
return;
dev_err_ratelimited(dev->dev, "OCP error\n");
}
static irqreturn_t omap_irq_handler(int irq, void *arg)
{
struct drm_device *dev = (struct drm_device *) arg;
struct omap_drm_private *priv = dev->dev_private;
struct omap_irq_wait *wait, *n;
unsigned long flags;
unsigned int id;
u32 irqstatus;
irqstatus = priv->dispc_ops->read_irqstatus();
priv->dispc_ops->clear_irqstatus(irqstatus);
priv->dispc_ops->read_irqstatus(); /* flush posted write */
VERB("irqs: %08x", irqstatus);
for (id = 0; id < priv->num_crtcs; id++) {
struct drm_crtc *crtc = priv->crtcs[id];
enum omap_channel channel = omap_crtc_channel(crtc);
if (irqstatus & priv->dispc_ops->mgr_get_vsync_irq(channel)) {
drm_handle_vblank(dev, id);
omap_crtc_vblank_irq(crtc);
}
if (irqstatus & priv->dispc_ops->mgr_get_sync_lost_irq(channel))
omap_crtc_error_irq(crtc, irqstatus);
}
omap_irq_ocp_error_handler(dev, irqstatus);
omap_irq_fifo_underflow(priv, irqstatus);
spin_lock_irqsave(&priv->wait_lock, flags);
list_for_each_entry_safe(wait, n, &priv->wait_list, node) {
if (wait->irqmask & irqstatus)
omap_irq_wait_handler(wait);
}
spin_unlock_irqrestore(&priv->wait_lock, flags);
return IRQ_HANDLED;
}
static const u32 omap_underflow_irqs[] = {
[OMAP_DSS_GFX] = DISPC_IRQ_GFX_FIFO_UNDERFLOW,
[OMAP_DSS_VIDEO1] = DISPC_IRQ_VID1_FIFO_UNDERFLOW,
[OMAP_DSS_VIDEO2] = DISPC_IRQ_VID2_FIFO_UNDERFLOW,
[OMAP_DSS_VIDEO3] = DISPC_IRQ_VID3_FIFO_UNDERFLOW,
};
/*
* We need a special version, instead of just using drm_irq_install(),
* because we need to register the irq via omapdss. Once omapdss and
* omapdrm are merged together we can assign the dispc hwmod data to
* ourselves and drop these and just use drm_irq_{install,uninstall}()
*/
int omap_drm_irq_install(struct drm_device *dev)
{
struct omap_drm_private *priv = dev->dev_private;
unsigned int num_mgrs = priv->dispc_ops->get_num_mgrs();
unsigned int max_planes;
unsigned int i;
int ret;
spin_lock_init(&priv->wait_lock);
INIT_LIST_HEAD(&priv->wait_list);
priv->irq_mask = DISPC_IRQ_OCP_ERR;
max_planes = min(ARRAY_SIZE(priv->planes),
ARRAY_SIZE(omap_underflow_irqs));
for (i = 0; i < max_planes; ++i) {
if (priv->planes[i])
priv->irq_mask |= omap_underflow_irqs[i];
}
for (i = 0; i < num_mgrs; ++i)
priv->irq_mask |= priv->dispc_ops->mgr_get_sync_lost_irq(i);
priv->dispc_ops->runtime_get();
priv->dispc_ops->clear_irqstatus(0xffffffff);
priv->dispc_ops->runtime_put();
ret = priv->dispc_ops->request_irq(omap_irq_handler, dev);
if (ret < 0)
return ret;
dev->irq_enabled = true;
return 0;
}
void omap_drm_irq_uninstall(struct drm_device *dev)
{
struct omap_drm_private *priv = dev->dev_private;
if (!dev->irq_enabled)
return;
dev->irq_enabled = false;
priv->dispc_ops->free_irq(dev);
}