linux-kernel - Re: [PATCH] drm/ast: Fix black screen after resume

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Message-ID: <4bcb752a-1ef8-453f-a04e-05017920a9d8@suse.de>
Date: Thu, 18 Jul 2024 08:50:18 +0200
From: Thomas Zimmermann <tzimmermann@...e.de>
To: Jammy Huang <jammy_huang@...eedtech.com>, jfalempe@...hat.com,
 maarten.lankhorst@...ux.intel.com, mripard@...nel.org, airlied@...hat.com,
 airlied@...il.com, daniel@...ll.ch
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
 Cary Garrett <cogarre@...il.com>
Subject: Re: [PATCH] drm/ast: Fix black screen after resume

(Cary, this looks like it fixes the problem you reported.)

Hi Jammy

Am 18.07.24 um 05:03 schrieb Jammy Huang:
> Suspend will disable pcie device. Thus, resume should do full hw
> initialization again.
> Add some APIs to ast_drm_thaw() before ast_post_gpu() to fix the issue.
>
> Fixes: 5b71707dd13 ("drm/ast: Enable and unlock device access early during init")
> Signed-off-by: Jammy Huang <jammy_huang@...eedtech.com>

Reviewed-by: Thomas Zimmermann <tzimmermann@...e.de>

Thanks a lot for this fix.

Best regards
Thomas

> ---
>   drivers/gpu/drm/ast/ast_drv.c | 5 +++++
>   1 file changed, 5 insertions(+)
>
> diff --git a/drivers/gpu/drm/ast/ast_drv.c b/drivers/gpu/drm/ast/ast_drv.c
> index f8c49ba68e78..45a9c7bf49c8 100644
> --- a/drivers/gpu/drm/ast/ast_drv.c
> +++ b/drivers/gpu/drm/ast/ast_drv.c
> @@ -391,6 +391,11 @@ static int ast_drm_freeze(struct drm_device *dev)
>   
>   static int ast_drm_thaw(struct drm_device *dev)
>   {
> +	struct ast_device *ast = to_ast_device(dev);
> +
> +	ast_enable_vga(ioregs);
> +	ast_open_key(ioregs);
> +	ast_enable_mmio(dev, ioregs);
>   	ast_post_gpu(dev);
>   
>   	return drm_mode_config_helper_resume(dev);
>
> base-commit: e9d22f7a6655941fc8b2b942ed354ec780936b3e
> prerequisite-patch-id: a03a33902f33bcc38091e2cdce9d79f630464c30
> prerequisite-patch-id: 505779a1e2094f2ee2f2a55ad44aac5cd1d5342f

-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)