media: stm32: dcmi: create a dma scatterlist based on DMA max_sg_burst value

Browse source

Prior to submitting a transfer to the DMA, the client should first check
the capabilities of the DMA channel in term of maximum of each segment.
This is given by the max_sg_burst value reported by dma_get_slave_caps API.
Based on that, if the transfer is larger than what can be handled by the
DMA channel, we split the transfer into several scatterlist elements.

[hverkuil: fix checkpatch parenthesis alignment warning]

Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

...

This commit is contained in:

Alain Volmat 2022-01-10 11:37:39 +01:00 • committed by Mauro Carvalho Chehab

parent fc5004e5d4

commit c1b403352c

1 changed files with 39 additions and 12 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

51

drivers/media/platform/stm32/stm32-dcmi.c

View file