linux-kernel - Re: [RESEND PATCH 3/5] drm: Rename vgacon_text_force() function to drm_modeset

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Date:   Wed, 3 Nov 2021 15:28:35 +0100
From:   Javier Martinez Canillas <javierm@...hat.com>
To:     Thomas Zimmermann <tzimmermann@...e.de>,
        linux-kernel@...r.kernel.org
Cc:     David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        dri-devel@...ts.freedesktop.org,
        Gurchetan Singh <gurchetansingh@...omium.org>,
        Gerd Hoffmann <kraxel@...hat.com>,
        amd-gfx@...ts.freedesktop.org,
        VMware Graphics <linux-graphics-maintainer@...are.com>,
        Peter Robinson <pbrobinson@...il.com>,
        Neal Gompa <ngompa13@...il.com>,
        Dave Airlie <airlied@...hat.com>,
        Ben Skeggs <bskeggs@...hat.com>,
        Michel Dänzer <michel@...nzer.net>,
        Hans de Goede <hdegoede@...hat.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        nouveau@...ts.freedesktop.org,
        virtualization@...ts.linux-foundation.org,
        Pekka Paalanen <pekka.paalanen@...labora.com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        spice-devel@...ts.freedesktop.org,
        Alex Deucher <alexander.deucher@....com>,
        intel-gfx@...ts.freedesktop.org,
        Christian König <christian.koenig@....com>
Subject: Re: [RESEND PATCH 3/5] drm: Rename vgacon_text_force() function to
 drm_modeset_disabled()

On 11/3/21 13:57, Thomas Zimmermann wrote:

[snip]

>>   
>> -	if (vgacon_text_force()) {
>> +	if (drm_modeset_disabled()) {
>>   		DRM_ERROR("amdgpu kernel modesetting disabled.\n");
> 
> Please remove all such error messages from drivers. 
> drm_modeset_disabled() should print a unified message instead.
>

Agreed.

>> -static bool vgacon_text_mode_force;
>> +static bool drm_nomodeset;
>>   
>> -bool vgacon_text_force(void)
>> +bool drm_modeset_disabled(void)
> 
> I suggest to rename this function to drm_check_modeset() and have it 
> return a negative errno code on failure. This gives maximum flexibility 
> and reduces errors in drivers. Right now the drivers return something 
> like -EINVAL, which seems wrong. Returning -ENODEV seems more appropriate.
>

Good idea. I'll do it in v2 as well.
 
Best regards,
-- 
Javier Martinez Canillas
Linux Engineering
Red Hat