* [PATCH 6.16 119/143] drm/ast: Use msleep instead of mdelay for edid read
[not found] <20250930143831.236060637@linuxfoundation.org>
@ 2025-09-30 14:47 ` Greg Kroah-Hartman
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From: Greg Kroah-Hartman @ 2025-09-30 14:47 UTC (permalink / raw)
To: stable
Cc: Greg Kroah-Hartman, patches, Nirmoy Das, Thomas Zimmermann,
KuoHsiang Chou, Dave Airlie, Jocelyn Falempe, dri-devel,
Carol L Soto csoto@nvidia.com
6.16-stable review patch. If anyone has any objections, please let me know.
------------------
From: Nirmoy Das <nirmoyd@nvidia.com>
commit c7c31f8dc54aa3c9b2c994b5f1ff7e740a654e97 upstream.
The busy-waiting in `mdelay()` can cause CPU stalls and kernel timeouts
during boot.
Signed-off-by: Nirmoy Das <nirmoyd@nvidia.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Tested-by: Carol L Soto csoto@nvidia.com<mailto:csoto@nvidia.com>
Fixes: 594e9c04b586 ("drm/ast: Create the driver for ASPEED proprietory Display-Port")
Cc: KuoHsiang Chou <kuohsiang_chou@aspeedtech.com>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Jocelyn Falempe <jfalempe@redhat.com>
Cc: dri-devel@lists.freedesktop.org
Cc: <stable@vger.kernel.org> # v5.19+
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://lore.kernel.org/r/20250917194346.2905522-1-nirmoyd@nvidia.com
Signed-off-by: Greg Kroah-Hartman <gregkh@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
@@ -134,7 +134,7 @@ 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);
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