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drm: omapdrm: Simplify IRQ registration 

The omapdrm can't use drm_irq_install() and drm_irq_uninstall() as it
delegates IRQ handling to the omapdss driver. However, the code still
declares IRQ-related operations used by the DRM IRQ helpers, and calls
them indirectly.

Simplify the implementation by calling the functions directly or
inlining them. The irq_enabled checks can then also be simplified as
the call stacks guarantees that omap_drm_irq_install() and
omap_drm_irq_uninstall() will never run concurrently.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
hifive-unleashed-5.1
Laurent Pinchart 2015-01-25 22:06:45 +02:00
parent 42fb61cc68
commit f13ab00567
3 changed files with 27 additions and 92 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/gpu/drm/omapdrm/omap_drv.c
View File

@ -656,8 +656,7 @@ static const struct file_operations omapdriver_fops = {
};
static struct drm_driver omap_drm_driver = {
.driver_features = DRIVER_HAVE_IRQ | DRIVER_MODESET | DRIVER_GEM
| DRIVER_PRIME,
.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME,
.load = dev_load,
.unload = dev_unload,
.open = dev_open,
@ -668,10 +667,6 @@ static struct drm_driver omap_drm_driver = {
.get_vblank_counter = drm_vblank_count,
.enable_vblank = omap_irq_enable_vblank,
.disable_vblank = omap_irq_disable_vblank,
.irq_preinstall = omap_irq_preinstall,
.irq_postinstall = omap_irq_postinstall,
.irq_uninstall = omap_irq_uninstall,
.irq_handler = omap_irq_handler,
#ifdef CONFIG_DEBUG_FS
.debugfs_init = omap_debugfs_init,
.debugfs_cleanup = omap_debugfs_cleanup,

6
drivers/gpu/drm/omapdrm/omap_drv.h
View File

@ -122,15 +122,11 @@ int omap_gem_resume(struct device *dev);
int omap_irq_enable_vblank(struct drm_device *dev, int crtc_id);
void omap_irq_disable_vblank(struct drm_device *dev, int crtc_id);
irqreturn_t omap_irq_handler(int irq, void *arg);
void omap_irq_preinstall(struct drm_device *dev);
int omap_irq_postinstall(struct drm_device *dev);
void omap_irq_uninstall(struct drm_device *dev);
void __omap_irq_register(struct drm_device *dev, struct omap_drm_irq *irq);
void __omap_irq_unregister(struct drm_device *dev, struct omap_drm_irq *irq);
void omap_irq_register(struct drm_device *dev, struct omap_drm_irq *irq);
void omap_irq_unregister(struct drm_device *dev, struct omap_drm_irq *irq);
int omap_drm_irq_uninstall(struct drm_device *dev);
void omap_drm_irq_uninstall(struct drm_device *dev);
int omap_drm_irq_install(struct drm_device *dev);
struct drm_fb_helper *omap_fbdev_init(struct drm_device *dev);

106
drivers/gpu/drm/omapdrm/omap_irq.c
View File

@ -187,7 +187,7 @@ void omap_irq_disable_vblank(struct drm_device *dev, int crtc_id)
dispc_runtime_put();
}
irqreturn_t omap_irq_handler(int irq, void *arg)
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;
@ -222,23 +222,29 @@ irqreturn_t omap_irq_handler(int irq, void *arg)
return IRQ_HANDLED;
}
void omap_irq_preinstall(struct drm_device *dev)
{
DBG("dev=%p", dev);
dispc_runtime_get();
dispc_clear_irqstatus(0xffffffff);
dispc_runtime_put();
}
/*
* 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_irq_postinstall(struct drm_device *dev)
int omap_drm_irq_install(struct drm_device *dev)
{
struct omap_drm_private *priv = dev->dev_private;
struct omap_drm_irq *error_handler = &priv->error_handler;
DBG("dev=%p", dev);
int ret;
INIT_LIST_HEAD(&priv->irq_list);
dispc_runtime_get();
dispc_clear_irqstatus(0xffffffff);
dispc_runtime_put();
ret = dispc_request_irq(omap_irq_handler, dev);
if (ret < 0)
return ret;
error_handler->irq = omap_irq_error_handler;
error_handler->irqmask = DISPC_IRQ_OCP_ERR;
@ -249,76 +255,22 @@ int omap_irq_postinstall(struct drm_device *dev)
omap_irq_register(dev, error_handler);
dev->irq_enabled = true;
return 0;
}
void omap_irq_uninstall(struct drm_device *dev)
{
DBG("dev=%p", dev);
// TODO prolly need to call drm_irq_uninstall() somewhere too
}
/*
* 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)
{
int ret;
mutex_lock(&dev->struct_mutex);
if (dev->irq_enabled) {
mutex_unlock(&dev->struct_mutex);
return -EBUSY;
}
dev->irq_enabled = true;
mutex_unlock(&dev->struct_mutex);
/* Before installing handler */
if (dev->driver->irq_preinstall)
dev->driver->irq_preinstall(dev);
ret = dispc_request_irq(dev->driver->irq_handler, dev);
if (ret < 0) {
mutex_lock(&dev->struct_mutex);
dev->irq_enabled = false;
mutex_unlock(&dev->struct_mutex);
return ret;
}
/* After installing handler */
if (dev->driver->irq_postinstall)
ret = dev->driver->irq_postinstall(dev);
if (ret < 0) {
mutex_lock(&dev->struct_mutex);
dev->irq_enabled = false;
mutex_unlock(&dev->struct_mutex);
dispc_free_irq(dev);
}
return ret;
}
int omap_drm_irq_uninstall(struct drm_device *dev)
void omap_drm_irq_uninstall(struct drm_device *dev)
{
unsigned long irqflags;
bool irq_enabled;
int i;
mutex_lock(&dev->struct_mutex);
irq_enabled = dev->irq_enabled;
dev->irq_enabled = false;
mutex_unlock(&dev->struct_mutex);
if (!dev->irq_enabled)
return;
/*
* Wake up any waiters so they don't hang.
*/
dev->irq_enabled = false;
/* Wake up any waiters so they don't hang. */
if (dev->num_crtcs) {
spin_lock_irqsave(&dev->vbl_lock, irqflags);
for (i = 0; i < dev->num_crtcs; i++) {
@ -330,13 +282,5 @@ int omap_drm_irq_uninstall(struct drm_device *dev)
spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
}
if (!irq_enabled)
return -EINVAL;
if (dev->driver->irq_uninstall)
dev->driver->irq_uninstall(dev);
dispc_free_irq(dev);
return 0;
}