From b26039d1642c15ea841a1d7da4e7fdabf67acbf3 Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai@suse.de>
Date: Wed, 21 Apr 2021 13:12:47 +0200
Subject: [PATCH 01/11] drm/ast: Disable VGA decoding while driver is active
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_main.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/gpu/drm/ast/ast_main.c b/drivers/gpu/drm/ast/ast_main.c
index 6a9fba051d13..93df685e5773 100644
--- a/drivers/gpu/drm/ast/ast_main.c
+++ b/drivers/gpu/drm/ast/ast_main.c
@@ -137,6 +137,9 @@ static int ast_detect_chip(struct drm_device *dev, bool *need_post)
ast_open_key(ast);
ast_enable_mmio(dev);
+ /* disable standard VGA decode */
+ ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0xa1, 0x06);
+
/* Find out whether P2A works or whether to use device-tree */
ast_detect_config_mode(dev, &scu_rev);
--
2.26.2