diff options
| author | Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> | 2021-07-30 15:18:29 +0200 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@kernel.org> | 2022-02-16 12:47:02 +0100 |
| commit | 4a2e0a806cb58a4d3106add079488e0b56a221b6 (patch) | |
| tree | ed222cfea93b957a9e606b548c25a881a13d0240 /drivers/media/test-drivers/vimc/vimc-core.c | |
| parent | 79e8c421a099bfbcebe59740153e55aa0442ced6 (diff) | |
media: vimc: Add support for contiguous DMA buffers
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>
Diffstat (limited to 'drivers/media/test-drivers/vimc/vimc-core.c')
| -rw-r--r-- | drivers/media/test-drivers/vimc/vimc-core.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/media/test-drivers/vimc/vimc-core.c b/drivers/media/test-drivers/vimc/vimc-core.c index 4b0ae6f51d76..06edf9d4d92c 100644 --- a/drivers/media/test-drivers/vimc/vimc-core.c +++ b/drivers/media/test-drivers/vimc/vimc-core.c @@ -5,6 +5,7 @@ * Copyright (C) 2015-2017 Helen Koike <helen.fornazier@gmail.com> */ +#include <linux/dma-mapping.h> #include <linux/font.h> #include <linux/init.h> #include <linux/module.h> @@ -15,6 +16,12 @@ #include "vimc-common.h" +unsigned int vimc_allocator; +module_param_named(allocator, vimc_allocator, uint, 0444); +MODULE_PARM_DESC(allocator, " memory allocator selection, default is 0.\n" + "\t\t 0 == vmalloc\n" + "\t\t 1 == dma-contig"); + #define VIMC_MDEV_MODEL_NAME "VIMC MDEV" #define VIMC_ENT_LINK(src, srcpad, sink, sinkpad, link_flags) { \ @@ -278,6 +285,9 @@ static int vimc_probe(struct platform_device *pdev) tpg_set_font(font->data); + if (vimc_allocator == VIMC_ALLOCATOR_DMA_CONTIG) + dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); + vimc = kzalloc(sizeof(*vimc), GFP_KERNEL); if (!vimc) return -ENOMEM; |