linux-kernel - [PATCH 5.15 315/913] media: cedrus: H265: Fix neighbour info buffer size

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Message-Id: <20220405070349.295036113@linuxfoundation.org>
Date:   Tue,  5 Apr 2022 09:22:57 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jernej Skrabec <jernej.skrabec@...il.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 315/913] media: cedrus: H265: Fix neighbour info buffer size

From: Jernej Skrabec <jernej.skrabec@...il.com>

[ Upstream commit ee8b887329c78971967506f3ac79b9302c9f83c1 ]

Neighbour info buffer size needs to be 794 kiB in H6. This is actually
already indirectly mentioned in the comment, but smaller size is used
nevertheless.

Increase buffer size to cover H6 needs. Since increase is not that big
in absolute numbers, it doesn't make sense to complicate logic for older
generations.

Bug was discovered using iommu, which reported access error when trying
to play H265 video.

Fixes: 86caab29da78 ("media: cedrus: Add HEVC/H.265 decoding support")
Signed-off-by: Jernej Skrabec <jernej.skrabec@...il.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@...all.nl>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/staging/media/sunxi/cedrus/cedrus_h265.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_h265.c b/drivers/staging/media/sunxi/cedrus/cedrus_h265.c
index ef0311a16d01..754942ecf064 100644
--- a/drivers/staging/media/sunxi/cedrus/cedrus_h265.c
+++ b/drivers/staging/media/sunxi/cedrus/cedrus_h265.c
@@ -23,7 +23,7 @@
  * Subsequent BSP implementations seem to double the neighbor info buffer size
  * for the H6 SoC, which may be related to 10 bit H265 support.
  */
-#define CEDRUS_H265_NEIGHBOR_INFO_BUF_SIZE	(397 * SZ_1K)
+#define CEDRUS_H265_NEIGHBOR_INFO_BUF_SIZE	(794 * SZ_1K)
 #define CEDRUS_H265_ENTRY_POINTS_BUF_SIZE	(4 * SZ_1K)
 #define CEDRUS_H265_MV_COL_BUF_UNIT_CTB_SIZE	160
 
-- 
2.34.1