drm/ast: Use msleep instead of mdelay for edid read

[ Upstream commit c7c31f8dc54aa3c9b2c994b5f1ff7e740a654e97 ]

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
[ Applied change to ast_astdp_read_edid() instead of ast_astdp_read_edid_block() ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/ast/ast_dp.c b/drivers/gpu/drm/ast/ast_dp.c
index a4a23b9623ad3747b2660c2ca701c6529297a65a..7d2fb34c72b7566030771f73951253e2e24f304c 100644 (file)
--- a/drivers/gpu/drm/ast/ast_dp.c
+++ b/drivers/gpu/drm/ast/ast_dp.c
@@ -51,7 +51,7 @@ int ast_astdp_read_edid(struct drm_device *dev, u8 *ediddata)
                         *        of right-click of mouse.
                         * 2. The Delays are often longer a lot when system resume from S3/S4.
                         */
-                       mdelay(j+1);
+                       msleep(j + 1);
 
                        if (!(ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xD1,
                                                        ASTDP_MCU_FW_EXECUTING) &&