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drm/exynos: add wait_for_vblank callback interface.

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Changelog v2:
fixed comments.

Changelog v1:
this interface can be used to make sure that hardware overlay is disabled
to avoid that memory region is accessed by dma after gem buffer was released.

Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
This commit is contained in:
Inki Dae 2012-08-20 19:55:14 +09:00
parent 50caf25c58
commit b011941f0f
2 changed files with 27 additions and 0 deletions
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17
drivers/gpu/drm/exynos/exynos_drm_drv.h
View File

@ -37,6 +37,20 @@
#define MAX_FB_BUFFER 4
#define DEFAULT_ZPOS -1
#define _wait_for(COND, MS) ({ \
unsigned long timeout__ = jiffies + msecs_to_jiffies(MS); \
int ret__ = 0; \
while (!(COND)) { \
if (time_after(jiffies, timeout__)) { \
ret__ = -ETIMEDOUT; \
break; \
} \
} \
ret__; \
})
#define wait_for(COND, MS) _wait_for(COND, MS)
struct drm_device;
struct exynos_drm_overlay;
struct drm_connector;
@ -61,6 +75,8 @@ enum exynos_drm_output_type {
* @commit: apply hardware specific overlay data to registers.
* @enable: enable hardware specific overlay.
* @disable: disable hardware specific overlay.
* @wait_for_vblank: wait for vblank interrupt to make sure that
* hardware overlay is disabled.
*/
struct exynos_drm_overlay_ops {
void (*mode_set)(struct device *subdrv_dev,
@ -68,6 +84,7 @@ struct exynos_drm_overlay_ops {
void (*commit)(struct device *subdrv_dev, int zpos);
void (*enable)(struct device *subdrv_dev, int zpos);
void (*disable)(struct device *subdrv_dev, int zpos);
void (*wait_for_vblank)(struct device *subdrv_dev);
};
/*

10
drivers/gpu/drm/exynos/exynos_drm_encoder.c
View File

@ -430,4 +430,14 @@ void exynos_drm_encoder_plane_disable(struct drm_encoder *encoder, void *data)
if (overlay_ops && overlay_ops->disable)
overlay_ops->disable(manager->dev, zpos);
/*
* wait for vblank interrupt
* - this makes sure that hardware overlay is disabled to avoid
* for the dma accesses to memory after gem buffer was released
* because the setting for disabling the overlay will be updated
* at vsync.
*/
if (overlay_ops->wait_for_vblank)
overlay_ops->wait_for_vblank(manager->dev);
}