From bfe3a42b61679a39d308268c40e5c18fbfb53fdf Mon Sep 17 00:00:00 2001 From: Nirmoy Das Date: Mon, 29 Sep 2025 11:54:09 -0400 Subject: [PATCH] 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 Reviewed-by: Thomas Zimmermann Tested-by: Carol L Soto csoto@nvidia.com Fixes: 594e9c04b586 ("drm/ast: Create the driver for ASPEED proprietory Display-Port") Cc: KuoHsiang Chou Cc: Thomas Zimmermann Cc: Dave Airlie Cc: Jocelyn Falempe Cc: dri-devel@lists.freedesktop.org Cc: # v5.19+ Signed-off-by: Thomas Zimmermann 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 Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/ast/ast_dp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/ast/ast_dp.c b/drivers/gpu/drm/ast/ast_dp.c index a4a23b9623ad3..7d2fb34c72b75 100644 --- 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) && -- 2.47.3