This is a note to let you know that I've just added the patch titled
drm/msm/dsi: Use DIV_ROUND_UP instead of conditional increment on modulo
to the 6.1-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-msm-dsi-use-div_round_up-instead-of-conditional-.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 9fe662851917018074d242c5e8fb9341540d3896
Author: Marijn Suijten <marijn.suijten@xxxxxxxxxxxxxx>
Date: Wed Oct 26 20:28:17 2022 +0200
drm/msm/dsi: Use DIV_ROUND_UP instead of conditional increment on modulo
[ Upstream commit 1e8196103bd02a396b45c8f6188541634a47fce2 ]
This exact same math is used to compute bytes_in_slice above in
dsi_update_dsc_timing(), also used to fill slice_chunk_size.
Fixes: b9080324d6ca ("drm/msm/dsi: add support for dsc data")
Reviewed-by: Abhinav Kumar <quic_abhinavk@xxxxxxxxxxx>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Signed-off-by: Marijn Suijten <marijn.suijten@xxxxxxxxxxxxxx>
Patchwork: https://patchwork.freedesktop.org/patch/508935/
Link: https://lore.kernel.org/r/20221026182824.876933-4-marijn.suijten@xxxxxxxxxxxxxx
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
index d94832504d0f..88c8aa5c6b80 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_host.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
@@ -1807,9 +1807,7 @@ static int dsi_populate_dsc_params(struct drm_dsc_config *dsc)
* params are calculated
*/
groups_per_line = DIV_ROUND_UP(dsc->slice_width, 3);
- dsc->slice_chunk_size = dsc->slice_width * dsc->bits_per_pixel / 8;
- if ((dsc->slice_width * dsc->bits_per_pixel) % 8)
- dsc->slice_chunk_size++;
+ dsc->slice_chunk_size = DIV_ROUND_UP(dsc->slice_width * dsc->bits_per_pixel, 8);
/* rbs-min */
min_rate_buffer_size = dsc->rc_model_size - dsc->initial_offset +
