[PATCH] media: stm32-dcmi: Enable incoherent buffer allocation

[Marek Vasut]

Set allow_cache_hints to 1 for the vb2_queue capture queue in the
STM32MP15xx DCMI V4L2 driver. This allows us to allocate buffers
with the V4L2_MEMORY_FLAG_NON_COHERENT set. On STM32MP15xx SoCs,
this enables caching for this memory, which improves performance
when being read from CPU.

This change should be safe from race conditions since videobuf2
already invalidates or flushes the appropriate cache lines in
its prepare() and finish() methods.

Tested on a STM32MP157F SoC. Resulted in 4x buffer access speedup.

Signed-off-by: Marek Vasut <marex at denx.de>
---
Cc: "Christian König" <christian.koenig at amd.com>
Cc: Alexandre Torgue <alexandre.torgue at foss.st.com>
Cc: Hugues Fruchet <hugues.fruchet at foss.st.com>
Cc: Mauro Carvalho Chehab <mchehab at kernel.org>
Cc: Maxime Coquelin <mcoquelin.stm32 at gmail.com>
Cc: Philipp Zabel <p.zabel at pengutronix.de>
Cc: Sumit Semwal <sumit.semwal at linaro.org>
Cc: dri-devel at lists.freedesktop.org
Cc: linaro-mm-sig at lists.linaro.org
Cc: linux-arm-kernel at lists.infradead.org
Cc: linux-media at vger.kernel.org
Cc: linux-stm32 at st-md-mailman.stormreply.com
---
 drivers/media/platform/st/stm32/stm32-dcmi.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/media/platform/st/stm32/stm32-dcmi.c b/drivers/media/platform/st/stm32/stm32-dcmi.c
index ad8e9742e1ae7..2ac508da5ba36 100644
--- a/drivers/media/platform/st/stm32/stm32-dcmi.c
+++ b/drivers/media/platform/st/stm32/stm32-dcmi.c
@@ -2084,6 +2084,7 @@ static int dcmi_probe(struct platform_device *pdev)
 	q->mem_ops = &vb2_dma_contig_memops;
 	q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
 	q->min_buffers_needed = 2;
+	q->allow_cache_hints = 1;
 	q->dev = &pdev->dev;
 
 	ret = vb2_queue_init(q);
-- 
2.39.2