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drm/ast: Fixed reboot test may cause system hanged

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There is another thread still access standard VGA I/O while loading drm driver.
Disable standard VGA I/O decode to avoid this issue.

Signed-off-by: Y.C. Chen <yc_chen@aspeedtech.com>
Reviewed-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1523410059-18415-1-git-send-email-yc_chen@aspeedtech.com
This commit is contained in:
Y.C. Chen
2018-04-11 09:27:39 +08:00
committed by Dave Airlie
parent d45331b00d
commit 05b439711f
3 changed files with 6 additions and 3 deletions
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2
drivers/gpu/drm/ast/ast_post.c
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@@ -46,7 +46,7 @@ void ast_enable_mmio(struct drm_device *dev)
{
struct ast_private *ast = dev->dev_private;
ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xa1, 0xff, 0x04);
ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0xa1, 0x06);
}