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| author | Tomi Valkeinen <tomi.valkeinen@ti.com> | 2013-10-24 09:50:50 +0300 |
|---|---|---|
| committer | Tomi Valkeinen <tomi.valkeinen@ti.com> | 2014-01-09 15:15:24 +0200 |
| commit | 6da9f89172b94411896130c6e1acf159da3dc760 (patch) | |
| tree | fb656b3cd9cdb5973f6891ccde3be5fb4fcb739a /drivers/gpu/drm/omapdrm/omap_irq.c | |
| parent | 802eee95bde72fd0cd0f3a5b2098375a487d1eda (diff) | |
| download | linux-stable-6da9f89172b94411896130c6e1acf159da3dc760.tar.gz linux-stable-6da9f89172b94411896130c6e1acf159da3dc760.tar.bz2 linux-stable-6da9f89172b94411896130c6e1acf159da3dc760.zip | |
drm/omap: fix (un)registering irqs inside an irq handler
omapdrm (un)registers irqs inside an irq handler. The problem is that
the (un)register function uses dispc_runtime_get/put() to enable the
clocks, and those functions are not irq safe by default.
This was kind of fixed in 48664b21aeeffb40c5fa06843f18052e2c4ec9ef
(OMAPDSS: DISPC: set irq_safe for runtime PM), which makes dispc's
runtime calls irq-safe.
However, using pm_runtime_irq_safe in dispc makes the parent of dispc,
dss, always enabled, effectively preventing PM for the whole DSS module.
This patch makes omapdrm behave better by adding new irq (un)register
functions that do not use dispc_runtime_get/put, and using those
functions in interrupt context. Thus we can make dispc again
non-irq-safe, allowing proper PM.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc: Rob Clark <robdclark@gmail.com>
Diffstat (limited to 'drivers/gpu/drm/omapdrm/omap_irq.c')
| -rw-r--r-- | drivers/gpu/drm/omapdrm/omap_irq.c | 22 |
1 files changed, 18 insertions, 4 deletions
diff --git a/drivers/gpu/drm/omapdrm/omap_irq.c b/drivers/gpu/drm/omapdrm/omap_irq.c index cb858600185f..da690d0e0f03 100644 --- a/drivers/gpu/drm/omapdrm/omap_irq.c +++ b/drivers/gpu/drm/omapdrm/omap_irq.c @@ -45,12 +45,11 @@ static void omap_irq_update(struct drm_device *dev) dispc_read_irqenable(); /* flush posted write */ } -void omap_irq_register(struct drm_device *dev, struct omap_drm_irq *irq) +void __omap_irq_register(struct drm_device *dev, struct omap_drm_irq *irq) { struct omap_drm_private *priv = dev->dev_private; unsigned long flags; - dispc_runtime_get(); spin_lock_irqsave(&list_lock, flags); if (!WARN_ON(irq->registered)) { @@ -60,14 +59,21 @@ void omap_irq_register(struct drm_device *dev, struct omap_drm_irq *irq) } spin_unlock_irqrestore(&list_lock, flags); +} + +void omap_irq_register(struct drm_device *dev, struct omap_drm_irq *irq) +{ + dispc_runtime_get(); + + __omap_irq_register(dev, irq); + dispc_runtime_put(); } -void omap_irq_unregister(struct drm_device *dev, struct omap_drm_irq *irq) +void __omap_irq_unregister(struct drm_device *dev, struct omap_drm_irq *irq) { unsigned long flags; - dispc_runtime_get(); spin_lock_irqsave(&list_lock, flags); if (!WARN_ON(!irq->registered)) { @@ -77,6 +83,14 @@ void omap_irq_unregister(struct drm_device *dev, struct omap_drm_irq *irq) } spin_unlock_irqrestore(&list_lock, flags); +} + +void omap_irq_unregister(struct drm_device *dev, struct omap_drm_irq *irq) +{ + dispc_runtime_get(); + + __omap_irq_unregister(dev, irq); + dispc_runtime_put(); } |