This is a note to let you know that I've just added the patch titled
drm/ast: Use msleep instead of mdelay for edid read
to the 6.12-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-ast-use-msleep-instead-of-mdelay-for-edid-read.patch
and it can be found in the queue-6.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <sta...@vger.kernel.org> know about it.
>From c7c31f8dc54aa3c9b2c994b5f1ff7e740a654e97 Mon Sep 17 00:00:00 2001
From: Nirmoy Das <nirm...@nvidia.com>
Date: Wed, 17 Sep 2025 12:43:46 -0700
Subject: drm/ast: Use msleep instead of mdelay for edid read
From: Nirmoy Das <nirm...@nvidia.com>
commit c7c31f8dc54aa3c9b2c994b5f1ff7e740a654e97 upstream.
The busy-waiting in `mdelay()` can cause CPU stalls and kernel timeouts
during boot.
Signed-off-by: Nirmoy Das <nirm...@nvidia.com>
Reviewed-by: Thomas Zimmermann <tzimmerm...@suse.de>
Tested-by: Carol L Soto cs...@nvidia.com<mailto:cs...@nvidia.com>
Fixes: 594e9c04b586 ("drm/ast: Create the driver for ASPEED proprietory
Display-Port")
Cc: KuoHsiang Chou <kuohsiang_c...@aspeedtech.com>
Cc: Thomas Zimmermann <tzimmerm...@suse.de>
Cc: Dave Airlie <airl...@redhat.com>
Cc: Jocelyn Falempe <jfale...@redhat.com>
Cc: dri-devel@lists.freedesktop.org
Cc: <sta...@vger.kernel.org> # v5.19+
Signed-off-by: Thomas Zimmermann <tzimmerm...@suse.de>
Link: https://lore.kernel.org/r/20250917194346.2905522-1-nirm...@nvidia.com
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/gpu/drm/ast/ast_dp.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/gpu/drm/ast/ast_dp.c
+++ b/drivers/gpu/drm/ast/ast_dp.c
@@ -79,7 +79,7 @@ static int ast_astdp_read_edid_block(voi
* 3. The Delays are often longer a lot when system
resume from S3/S4.
*/
if (j)
- mdelay(j + 1);
+ msleep(j + 1);
/* Wait for EDID offset to show up in mirror register */
vgacrd7 = ast_get_index_reg(ast, AST_IO_VGACRI, 0xd7);
Patches currently in stable-queue which might be from nirm...@nvidia.com are
queue-6.12/drm-ast-use-msleep-instead-of-mdelay-for-edid-read.patch
