linux-kernel - Re: [PATCH v3 14/15] drm/bochs: drop old fbdev emulation code

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Date:   Thu, 10 Jan 2019 12:09:59 +0100
From:   Noralf Trønnes <noralf@...nnes.org>
To:     Gerd Hoffmann <kraxel@...hat.com>
Cc:     dri-devel@...ts.freedesktop.org, David Airlie <airlied@...hat.com>,
        andr2000@...il.com, David Airlie <airlied@...ux.ie>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:DRM DRIVER FOR BOCHS VIRTUAL GPU" 
        <virtualization@...ts.linux-foundation.org>
Subject: Re: [PATCH v3 14/15] drm/bochs: drop old fbdev emulation code



Den 10.01.2019 11.16, skrev Gerd Hoffmann:
>   Hi,
> 
>>> -	drm_fb_helper_set_suspend_unlocked(&bochs->fb.helper, 1);
>>
>> The generic fbdev emulation doesn't take care of suspend/resume. You
>> could do this:
>> drm_fb_helper_set_suspend_unlocked(drm_dev->fb_helper, 1);
> 
> Additional to drm_mode_config_helper_suspend() I assume?

No, sorry for the confusion. I didn't know if you could use
drm_mode_config_helper_suspend() or not. That function takes care of
fbdev suspend as well:

int drm_mode_config_helper_suspend(struct drm_device *dev)
{
<...>
	drm_kms_helper_poll_disable(dev);
	drm_fb_helper_set_suspend_unlocked(dev->fb_helper, 1);
	state = drm_atomic_helper_suspend(dev);
<...>
}


> Does the call order matter?
> 
>>>  	drm_helper_resume_force_mode(drm_dev);
>>
>> The docs for this function has this to say:
>> * This function is deprecated. New drivers should implement atomic mode-
>> * setting and use the atomic suspend/resume helpers.
>>
>> Maybe you can use drm_mode_config_helper_suspend/resume() instead like
>> suggested in the drm_fbdev_generic_setup() docs.
> 
> That should work, yes.  The driver is simple enough ;)
> 
> cheers,
>   Gerd
>