linux-kernel - [PATCH] media: cedrus: h265: Fix configuring bitstream size

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Message-ID: <20231216130925.2533395-1-jernej.skrabec@gmail.com>
Date: Sat, 16 Dec 2023 14:09:25 +0100
From: Jernej Skrabec <jernej.skrabec@...il.com>
To: mripard@...nel.org,
	paul.kocialkowski@...tlin.com
Cc: mchehab@...nel.org,
	gregkh@...uxfoundation.org,
	wens@...e.org,
	samuel@...lland.org,
	hverkuil-cisco@...all.nl,
	linux-media@...r.kernel.org,
	linux-staging@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	linux-sunxi@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	Jernej Skrabec <jernej.skrabec@...il.com>
Subject: [PATCH] media: cedrus: h265: Fix configuring bitstream size

bit_size field holds size of slice, not slice + header. Because of HW
quirks, driver can't program in just slice, but also preceding header.
But that means that currently used bit_size is wrong (too small).
Instead, just use size of whole buffer. There is no harm in doing this.

Fixes: 86caab29da78 ("media: cedrus: Add HEVC/H.265 decoding support")
Suggested-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Signed-off-by: Jernej Skrabec <jernej.skrabec@...il.com>
---
 drivers/staging/media/sunxi/cedrus/cedrus_h265.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_h265.c b/drivers/staging/media/sunxi/cedrus/cedrus_h265.c
index fc9297232456..16c822637dc6 100644
--- a/drivers/staging/media/sunxi/cedrus/cedrus_h265.c
+++ b/drivers/staging/media/sunxi/cedrus/cedrus_h265.c
@@ -427,11 +427,11 @@ static int cedrus_h265_setup(struct cedrus_ctx *ctx, struct cedrus_run *run)
 	unsigned int ctb_addr_x, ctb_addr_y;
 	struct cedrus_buffer *cedrus_buf;
 	dma_addr_t src_buf_addr;
-	dma_addr_t src_buf_end_addr;
 	u32 chroma_log2_weight_denom;
 	u32 num_entry_point_offsets;
 	u32 output_pic_list_index;
 	u32 pic_order_cnt[2];
+	size_t slice_bytes;
 	u8 padding;
 	int count;
 	u32 reg;
@@ -443,6 +443,7 @@ static int cedrus_h265_setup(struct cedrus_ctx *ctx, struct cedrus_run *run)
 	pred_weight_table = &slice_params->pred_weight_table;
 	num_entry_point_offsets = slice_params->num_entry_point_offsets;
 	cedrus_buf = vb2_to_cedrus_buffer(&run->dst->vb2_buf);
+	slice_bytes = vb2_get_plane_payload(&run->src->vb2_buf, 0);
 
 	/*
 	 * If entry points offsets are present, we should get them
@@ -490,7 +491,7 @@ static int cedrus_h265_setup(struct cedrus_ctx *ctx, struct cedrus_run *run)
 
 	cedrus_write(dev, VE_DEC_H265_BITS_OFFSET, 0);
 
-	reg = slice_params->bit_size;
+	reg = slice_bytes * 8;
 	cedrus_write(dev, VE_DEC_H265_BITS_LEN, reg);
 
 	/* Source beginning and end addresses. */
@@ -504,10 +505,7 @@ static int cedrus_h265_setup(struct cedrus_ctx *ctx, struct cedrus_run *run)
 
 	cedrus_write(dev, VE_DEC_H265_BITS_ADDR, reg);
 
-	src_buf_end_addr = src_buf_addr +
-			   DIV_ROUND_UP(slice_params->bit_size, 8);
-
-	reg = VE_DEC_H265_BITS_END_ADDR_BASE(src_buf_end_addr);
+	reg = VE_DEC_H265_BITS_END_ADDR_BASE(src_buf_addr + slice_bytes);
 	cedrus_write(dev, VE_DEC_H265_BITS_END_ADDR, reg);
 
 	/* Coding tree block address */
-- 
2.43.0