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drm/ast: Fix black screen when getting out of suspend 

With an AST2600, the screen is garbage when going out of suspend.
This is because color settings are lost, and not restored on resume.
Force the color settings on DPMS_ON, to make sure the settings are correct.

I didn't write this code, it comes from the out-of-tree aspeed driver v1.13
https://www.aspeedtech.com/support_driver/

Signed-off-by: Jocelyn Falempe <jfalempe@redhat.com>
Tested-by: Venkat Tadikonda <venkateswara.rao@intel.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Tested-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20220622124815.356035-1-jfalempe@redhat.com
This commit is contained in:
Jocelyn Falempe 2022-06-22 14:48:15 +02:00
parent 3a149169e4
commit 5171660cbb
1 changed files with 13 additions and 0 deletions
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13
drivers/gpu/drm/ast/ast_mode.c
View File

@ -990,6 +990,9 @@ static void ast_crtc_dpms(struct drm_crtc *crtc, int mode)
{
struct ast_private *ast = to_ast_private(crtc->dev);
u8 ch = AST_DPMS_VSYNC_OFF | AST_DPMS_HSYNC_OFF;
struct ast_crtc_state *ast_state;
const struct drm_format_info *format;
struct ast_vbios_mode_info *vbios_mode_info;
/* TODO: Maybe control display signal generation with
* Sync Enable (bit CR17.7).
@ -1007,6 +1010,16 @@ static void ast_crtc_dpms(struct drm_crtc *crtc, int mode)
ast_dp_set_on_off(crtc->dev, 1);
}
ast_state = to_ast_crtc_state(crtc->state);
format = ast_state->format;
if (format) {
vbios_mode_info = &ast_state->vbios_mode_info;
ast_set_color_reg(ast, format);
ast_set_vbios_color_reg(ast, format, vbios_mode_info);
}
ast_crtc_load_lut(ast, crtc);
break;
case DRM_MODE_DPMS_STANDBY: