linux-kernel - Re: [PATCH v6 3/5] fbdev: Disable sysfb device registration when removing conflicting FBs

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Date:   Mon, 4 Jul 2022 13:04:21 +0200
From:   Javier Martinez Canillas <javierm@...hat.com>
To:     Xi Ruoyao <xry111@...uxfromscratch.org>,
        Zack Rusin <zackr@...are.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc:     "linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "deller@....de" <deller@....de>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        Linux-graphics-maintainer <Linux-graphics-maintainer@...are.com>,
        "kraxel@...hat.com" <kraxel@...hat.com>,
        "tzimmermann@...e.de" <tzimmermann@...e.de>,
        "daniel.vetter@...ll.ch" <daniel.vetter@...ll.ch>,
        "lersek@...hat.com" <lersek@...hat.com>
Subject: Re: [PATCH v6 3/5] fbdev: Disable sysfb device registration when
 removing conflicting FBs

Hello Xi,

On 7/4/22 12:29, Xi Ruoyao wrote:
> On Mon, 2022-07-04 at 17:36 +0800, Xi Ruoyao wrote:
> 
>>> Yes, please do. Either with CONFIG_SYSFB_SIMPLEFB disabled and CONFIG_FB_EFI
>>> enabled (so that "efi-framebuffer" is registered and efifb probed) or with
>>> CONFIG_SYSFB_SIMPLEFB but CONFIG_FB_SIMPLE enabled (so "simple-framebuffer
>>> is used too but with simplefb instead of simpledrm).
>>>  
>>> I'm not able to reproduce, it would be useful to have another data point.
>>
>> Also happening for me with CONFIG_SYSFB_SIMPLEFB, on a Intel Core i7-
>> 1065G7 (with iGPU).
>>
>> Reverting this commit on top of 5.19-rc5 "fixes" the issue.
> 
> With CONFIG_SYSFB_SIMPLEFB and CONFIG_FB_SIMPLE enabled, there is no
> issue.
> 
> I guess it's something going wrong on a "drm -> drm" pass over.  For now
> I'll continue to use simpledrm with this commit reverted.
> 

Yes, we need to also cherry-pick b84efa28a48 ("drm/aperture: Run fbdev
removal before internal helpers") now that the sysfb_disable() patches
are in v5.19-rc5.

-- 
Best regards,

Javier Martinez Canillas
Linux Engineering
Red Hat