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media: vimc: Add support for contiguous DMA buffers

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The vimc driver is used for testing purpose, and some test use cases
involve sharing buffers with a consumer device. Consumers often require
DMA contiguous memory, which vimc doesn't currently support. This leads
in the best case to usage of bounce buffers, which is very slow, and in
the worst case in a complete failure.

Add support for the dma-contig allocator in vimc to support those use
cases properly. The allocator is selected through a new "allocator"
module parameter, which defaults to vmalloc.

[hverkuil: add missing 'select VIDEOBUF2_DMA_CONFIG' to Kconfig]

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Laurent Pinchart
2021-07-30 15:18:29 +02:00
committed by Mauro Carvalho Chehab
parent 79e8c421a0
commit 4a2e0a806c
5 changed files with 38 additions and 2 deletions
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7
drivers/media/test-drivers/vimc/vimc-common.h
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@@ -35,6 +35,13 @@
#define VIMC_PIX_FMT_MAX_CODES 8
extern unsigned int vimc_allocator;
enum vimc_allocator_type {
VIMC_ALLOCATOR_VMALLOC = 0,
VIMC_ALLOCATOR_DMA_CONTIG = 1,
};
/**
* vimc_colorimetry_clamp - Adjust colorimetry parameters
*