linux-kernel - Re: [PATCH] Revert "drivers/firmware: Move sysfb_init() from device_initcall to subsys_initcall

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Date: Tue, 23 Jan 2024 16:39:02 +0200
From: Jani Nikula <jani.nikula@...ux.intel.com>
To: Thomas Zimmermann <tzimmermann@...e.de>, javierm@...hat.com,
 chenhuacai@...nel.org
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, Thomas
 Zimmermann <tzimmermann@...e.de>, Jaak Ristioja <jaak@...tioja.ee>, Huacai
 Chen <chenhuacai@...ngson.cn>, Thorsten Leemhuis
 <regressions@...mhuis.info>
Subject: Re: [PATCH] Revert "drivers/firmware: Move sysfb_init() from
 device_initcall to subsys_initcall_sync"

On Tue, 23 Jan 2024, Thomas Zimmermann <tzimmermann@...e.de> wrote:
> This reverts commit 60aebc9559492cea6a9625f514a8041717e3a2e4.
>
> Commit 60aebc9559492cea ("drivers/firmware: Move sysfb_init() from
> device_initcall to subsys_initcall_sync") messes up initialization order
> of the graphics drivers and leads to blank displays on some systems. So
> revert the commit.
>
> To make the display drivers fully independent from initialization
> order requires to track framebuffer memory by device and independently
> from the loaded drivers. The kernel currently lacks the infrastructure
> to do so.
>
> Reported-by: Jaak Ristioja <jaak@...tioja.ee>
> Closes: https://lore.kernel.org/dri-devel/ZUnNi3q3yB3zZfTl@P70.localdomain/T/#t
> Reported-by: Huacai Chen <chenhuacai@...ngson.cn>
> Closes: https://lore.kernel.org/dri-devel/20231108024613.2898921-1-chenhuacai@loongson.cn/
> Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/10133

FWIW,

Acked-by: Jani Nikula <jani.nikula@...el.com>

but would be great to get a Tested-by from Jaak or from the gitlab issue
reporter.

Thanks.


> Signed-off-by: Thomas Zimmermann <tzimmermann@...e.de>
> Cc: Javier Martinez Canillas <javierm@...hat.com>
> Cc: Thorsten Leemhuis <regressions@...mhuis.info>
> Cc: Jani Nikula <jani.nikula@...ux.intel.com>
> ---
>  drivers/firmware/sysfb.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/firmware/sysfb.c b/drivers/firmware/sysfb.c
> index 82fcfd29bc4d2..3c197db42c9d9 100644
> --- a/drivers/firmware/sysfb.c
> +++ b/drivers/firmware/sysfb.c
> @@ -128,4 +128,4 @@ static __init int sysfb_init(void)
>  }
>  
>  /* must execute after PCI subsystem for EFI quirks */
> -subsys_initcall_sync(sysfb_init);
> +device_initcall(sysfb_init);

-- 
Jani Nikula, Intel