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drm/v3d: Skip MMU flush if the device is currently off.

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If it's off, we know it will be reset on poweron, so the MMU won't
have any TLB cached from before this point.  Avoids failed waits for
MMU flush to reply.

Signed-off-by: Eric Anholt <eric@anholt.net>
(cherry picked from commit 3ee4e2e0a9e9587eacbb69b067bbc72ab2cdc47b)
This commit is contained in:
Eric Anholt
2019-01-14 12:35:43 -08:00
committed by popcornmix
parent a847d3144c
commit 045d23dbc5
1 changed files with 13 additions and 0 deletions
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13
drivers/gpu/drm/v3d/v3d_mmu.c
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@@ -18,6 +18,8 @@
* each client. This is not yet implemented.
*/
#include <linux/pm_runtime.h>
#include "v3d_drv.h"
#include "v3d_regs.h"
@@ -34,6 +36,14 @@ static int v3d_mmu_flush_all(struct v3d_dev *v3d)
{
int ret;
/* Keep power on the device on until we're done with this
* call, but skip the flush if the device is off and will be
* reset when powered back on.
*/
ret = pm_runtime_get_if_in_use(v3d->dev);
if (ret == 0)
return 0;
/* Make sure that another flush isn't already running when we
* start this one.
*/
@@ -61,6 +71,9 @@ static int v3d_mmu_flush_all(struct v3d_dev *v3d)
if (ret)
dev_err(v3d->dev, "MMUC flush wait idle failed\n");
pm_runtime_mark_last_busy(v3d->dev);
pm_runtime_put_autosuspend(v3d->dev);
return ret;
}