media: am437x-vpfe: Wait for end of frame before tear-down

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We were originally attempting to stop all processing as soon
as possible, but the in-progress DMA operation cannot be canceled.
This led to the module being in a busy state and prevented proper
power management functionality.

The existing implementation would attempt to clean things up by waiting
up to 50ms. However when receiving video frame at 15fps or lower,
it meant an inter frame arrival rate of 66.6 ms or higher.
In such cases upon tear down the following message could be seen:
omap_hwmod: vpfe0: _wait_target_disable failed

This patch fixes this issue by adding a stopping state where
we would wait for the next Vsync before disabling the hardware.

Signed-off-by: Benoit Parrot <bparrot@ti.com>
Acked-by: Lad Prabhakar <prabhakar.csengg@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

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This commit is contained in:

Benoit Parrot 2019-09-20 14:05:45 -03:00 • committed by Mauro Carvalho Chehab

parent e6784f9e4e

commit b58e69e9a5

2 changed files with 29 additions and 26 deletions

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52

drivers/media/platform/am437x/am437x-vpfe.c

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3

drivers/media/platform/am437x/am437x-vpfe.h

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