From af3f4f56cabfd8a2dd7003a4ac15cf0573ee51a9 Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai@suse.de>
Date: Wed, 21 Apr 2021 13:12:48 +0200
Subject: [PATCH 03/11] drm/ast: Disable screen on register init
Patch-mainline: Never, temporary fixes until upstream resolution
References: bsc#1174416
A code snippet forward-ported from A-Speed downstream driver.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
drivers/gpu/drm/ast/ast_post.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/ast/ast_post.c b/drivers/gpu/drm/ast/ast_post.c
index 6423d08afd8a..1b132c17fe5d 100644
--- a/drivers/gpu/drm/ast/ast_post.c
+++ b/drivers/gpu/drm/ast/ast_post.c
@@ -109,6 +109,10 @@ ast_set_def_ext_reg(struct drm_device *dev)
ast->chip == AST2500)
reg |= 0x20;
ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb6, 0xff, reg);
+
+ /* Screen off */
+ ast_set_index_reg_mask(ast, AST_IO_SEQ_PORT, 0x01, 0xff, 0x20);
+ udelay(10);
}
u32 ast_mindwm(struct ast_private *ast, u32 r)
--
2.26.2