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

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Date:   Thu, 10 Jan 2019 11:16:13 +0100
From:   Gerd Hoffmann <kraxel@...hat.com>
To:     Noralf Trønnes <noralf@...nnes.org>
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

  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?
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