This is a note to let you know that I've just added the patch titled
drm/etnaviv: fix DMA direction handling for cached RW buffers
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-etnaviv-fix-dma-direction-handling-for-cached-rw.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 5786c5c07acbf3666a3908ad7c9f2c9701bbb5c9
Author: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
Date: Fri Jun 21 19:11:06 2024 +0200
drm/etnaviv: fix DMA direction handling for cached RW buffers
[ Upstream commit 58979ad6330a70450ed78837be3095107d022ea9 ]
The dma sync operation needs to be done with DMA_BIDIRECTIONAL when
the BO is prepared for both read and write operations.
Fixes: a8c21a5451d8 ("drm/etnaviv: add initial etnaviv DRM driver")
Signed-off-by: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
Reviewed-by: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
Reviewed-by: Christian Gmeiner <cgmeiner@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem.c b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
index 1fa74226db91f..69f91662ba236 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gem.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
@@ -370,9 +370,11 @@ static void *etnaviv_gem_vmap_impl(struct etnaviv_gem_object *obj)
static inline enum dma_data_direction etnaviv_op_to_dma_dir(u32 op)
{
- if (op & ETNA_PREP_READ)
+ op &= ETNA_PREP_READ | ETNA_PREP_WRITE;
+
+ if (op == ETNA_PREP_READ)
return DMA_FROM_DEVICE;
- else if (op & ETNA_PREP_WRITE)
+ else if (op == ETNA_PREP_WRITE)
return DMA_TO_DEVICE;
else
return DMA_BIDIRECTIONAL;
