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

commit c7c31f8 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: 594e9c0 ("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>

Author: nirmoy

drivers/gpu/drm/ast/ast_dp.c

@@ -79,7 +79,7 @@ static int ast_astdp_read_edid_block(void *data, u8 *buf, unsigned int block, si
 			 * 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);