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[media] omap3isp: Refactor modules stop failure handling

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Modules failing to stop are fatal errors for the preview engine only.
Flag that condition separately from the other stop failures to prepare
support for more fatal errors.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Sakari Ailus <sakari.ailus@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
This commit is contained in:
Laurent Pinchart 2013-12-15 23:49:42 -03:00 committed by Mauro Carvalho Chehab
parent 661112cb7e
commit 112eee0c03
2 changed files with 24 additions and 14 deletions
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36
drivers/media/platform/omap3isp/isp.c
View File

@ -873,15 +873,12 @@ static int isp_pipeline_enable(struct isp_pipeline *pipe,
unsigned long flags;
int ret;
/* If the preview engine crashed it might not respond to read/write
* operations on the L4 bus. This would result in a bus fault and a
* kernel oops. Refuse to start streaming in that case. This check must
* be performed before the loop below to avoid starting entities if the
* pipeline won't start anyway (those entities would then likely fail to
* stop, making the problem worse).
/* Refuse to start streaming if an entity included in the pipeline has
* crashed. This check must be performed before the loop below to avoid
* starting entities if the pipeline won't start anyway (those entities
* would then likely fail to stop, making the problem worse).
*/
if ((pipe->entities & isp->crashed) &
(1U << isp->isp_prev.subdev.entity.id))
if (pipe->entities & isp->crashed)
return -EIO;
spin_lock_irqsave(&pipe->lock, flags);
@ -1014,13 +1011,23 @@ static int isp_pipeline_disable(struct isp_pipeline *pipe)
else
ret = 0;
/* Handle stop failures. An entity that fails to stop can
* usually just be restarted. Flag the stop failure nonetheless
* to trigger an ISP reset the next time the device is released,
* just in case.
*
* The preview engine is a special case. A failure to stop can
* mean a hardware crash. When that happens the preview engine
* won't respond to read/write operations on the L4 bus anymore,
* resulting in a bus fault and a kernel oops next time it gets
* accessed. Mark it as crashed to prevent pipelines including
* it from being started.
*/
if (ret) {
dev_info(isp->dev, "Unable to stop %s\n", subdev->name);
/* If the entity failed to stopped, assume it has
* crashed. Mark it as such, the ISP will be reset when
* applications will release it.
*/
isp->crashed |= 1U << subdev->entity.id;
isp->stop_failure = true;
if (subdev == &isp->isp_prev.subdev)
isp->crashed |= 1U << subdev->entity.id;
failure = -ETIMEDOUT;
}
}
@ -1225,6 +1232,7 @@ static int isp_reset(struct isp_device *isp)
udelay(1);
}
isp->stop_failure = false;
isp->crashed = 0;
return 0;
}
@ -1636,7 +1644,7 @@ void omap3isp_put(struct isp_device *isp)
/* Reset the ISP if an entity has failed to stop. This is the
* only way to recover from such conditions.
*/
if (isp->crashed)
if (isp->crashed || isp->stop_failure)
isp_reset(isp);
isp_disable_clocks(isp);
}

2
drivers/media/platform/omap3isp/isp.h
View File

@ -154,6 +154,7 @@ struct isp_xclk {
* regions.
* @stat_lock: Spinlock for handling statistics
* @isp_mutex: Mutex for serializing requests to ISP.
* @stop_failure: Indicates that an entity failed to stop.
* @crashed: Bitmask of crashed entities (indexed by entity ID)
* @has_context: Context has been saved at least once and can be restored.
* @ref_count: Reference count for handling multiple ISP requests.
@ -191,6 +192,7 @@ struct isp_device {
/* ISP Obj */
spinlock_t stat_lock; /* common lock for statistic drivers */
struct mutex isp_mutex; /* For handling ref_count field */
bool stop_failure;
u32 crashed;
int has_context;
int ref_count;