This is a note to let you know that I've just added the patch titled
drm/amd/display: guard write a 0 post_divider value to HW
to the 6.11-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-amd-display-guard-write-a-0-post_divider-value-t.patch
and it can be found in the queue-6.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit dfdb24a68816fcf4589b20e8b374884f52fecdc6
Author: Ahmed, Muhammad <Ahmed.Ahmed@xxxxxxx>
Date: Tue Aug 13 17:11:55 2024 -0400
drm/amd/display: guard write a 0 post_divider value to HW
[ Upstream commit 5d666496c24129edeb2bcb500498b87cc64e7f07 ]
[why]
post_divider_value should not be 0.
Reviewed-by: Charlene Liu <charlene.liu@xxxxxxx>
Signed-off-by: Ahmed, Muhammad <Ahmed.Ahmed@xxxxxxx>
Signed-off-by: Zaeem Mohamed <zaeem.mohamed@xxxxxxx>
Tested-by: Daniel Wheeler <daniel.wheeler@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/amd/display/dc/dccg/dcn35/dcn35_dccg.c b/drivers/gpu/drm/amd/display/dc/dccg/dcn35/dcn35_dccg.c
index 68cd3258f4a97..a64d8f3ec93a3 100644
--- a/drivers/gpu/drm/amd/display/dc/dccg/dcn35/dcn35_dccg.c
+++ b/drivers/gpu/drm/amd/display/dc/dccg/dcn35/dcn35_dccg.c
@@ -47,7 +47,8 @@ static void dccg35_trigger_dio_fifo_resync(struct dccg *dccg)
uint32_t dispclk_rdivider_value = 0;
REG_GET(DENTIST_DISPCLK_CNTL, DENTIST_DISPCLK_RDIVIDER, &dispclk_rdivider_value);
- REG_UPDATE(DENTIST_DISPCLK_CNTL, DENTIST_DISPCLK_WDIVIDER, dispclk_rdivider_value);
+ if (dispclk_rdivider_value != 0)
+ REG_UPDATE(DENTIST_DISPCLK_CNTL, DENTIST_DISPCLK_WDIVIDER, dispclk_rdivider_value);
}
static void dcn35_set_dppclk_enable(struct dccg *dccg,
