linux-kernel - Re: [PATCH V2] drm/atomic-helper: Make atomic_enable/disable crtc callbacks optional

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Date:   Tue, 26 Mar 2019 08:50:03 +0100
From:   Daniel Vetter <daniel@...ll.ch>
To:     Rodrigo Siqueira <rodrigosiqueiramelo@...il.com>
Cc:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
        Gerd Hoffmann <kraxel@...hat.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2] drm/atomic-helper: Make atomic_enable/disable crtc
 callbacks optional

On Mon, Mar 25, 2019 at 08:29:06AM -0300, Rodrigo Siqueira wrote:
> On 03/15, Daniel Vetter wrote:
> > On Thu, Mar 14, 2019 at 03:48:45PM -0300, Rodrigo Siqueira wrote:
> > > Allow atomic_enable and atomic_disable operations from
> > > drm_crtc_helper_funcs struct optional. With this, the target display
> > > drivers don't need to define a dummy function if they don't need one.
> > > 
> > > Changes since v2:
> > > * Don't make funcs optional
> > > * Update kerneldoc for atomic_enable/disable
> > > * Replace "if (funcs->atomic_enable)" by "if (funcs->commit)"
> > > * Improve commit message
> > > 
> > > Signed-off-by: Rodrigo Siqueira <rodrigosiqueiramelo@...il.com>
> > 
> > Reviewed-by: Daniel Vetter <daniel.vetter@...ll.ch>
> 
> Hi,
> Is it ok if I apply this patch?

Sure.
-Daniel

>  
> > > ---
> > >  drivers/gpu/drm/drm_atomic_helper.c      | 5 ++---
> > >  include/drm/drm_modeset_helper_vtables.h | 4 ++++
> > >  2 files changed, 6 insertions(+), 3 deletions(-)
> > > 
> > > diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
> > > index 540a77a2ade9..d506e13c2945 100644
> > > --- a/drivers/gpu/drm/drm_atomic_helper.c
> > > +++ b/drivers/gpu/drm/drm_atomic_helper.c
> > > @@ -1034,7 +1034,7 @@ disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state)
> > >  			funcs->atomic_disable(crtc, old_crtc_state);
> > >  		else if (funcs->disable)
> > >  			funcs->disable(crtc);
> > > -		else
> > > +		else if (funcs->dpms)
> > >  			funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
> > >  
> > >  		if (!(dev->irq_enabled && dev->num_crtcs))
> > > @@ -1277,10 +1277,9 @@ void drm_atomic_helper_commit_modeset_enables(struct drm_device *dev,
> > >  		if (new_crtc_state->enable) {
> > >  			DRM_DEBUG_ATOMIC("enabling [CRTC:%d:%s]\n",
> > >  					 crtc->base.id, crtc->name);
> > > -
> > >  			if (funcs->atomic_enable)
> > >  				funcs->atomic_enable(crtc, old_crtc_state);
> > > -			else
> > > +			else if (funcs->commit)
> > >  				funcs->commit(crtc);
> > >  		}
> > >  	}
> > > diff --git a/include/drm/drm_modeset_helper_vtables.h b/include/drm/drm_modeset_helper_vtables.h
> > > index cfb7be40bed7..ce4de6b1e444 100644
> > > --- a/include/drm/drm_modeset_helper_vtables.h
> > > +++ b/include/drm/drm_modeset_helper_vtables.h
> > > @@ -418,6 +418,8 @@ struct drm_crtc_helper_funcs {
> > >  	 * Drivers can use the @old_crtc_state input parameter if the operations
> > >  	 * needed to enable the CRTC don't depend solely on the new state but
> > >  	 * also on the transition between the old state and the new state.
> > > +	 *
> > > +	 * This function is optional.
> > >  	 */
> > >  	void (*atomic_enable)(struct drm_crtc *crtc,
> > >  			      struct drm_crtc_state *old_crtc_state);
> > > @@ -441,6 +443,8 @@ struct drm_crtc_helper_funcs {
> > >  	 * parameter @old_crtc_state which could be used to access the old
> > >  	 * state. Atomic drivers should consider to use this one instead
> > >  	 * of @disable.
> > > +	 *
> > > +	 * This function is optional.
> > >  	 */
> > >  	void (*atomic_disable)(struct drm_crtc *crtc,
> > >  			       struct drm_crtc_state *old_crtc_state);
> > > -- 
> > > 2.21.0
> > 
> > -- 
> > Daniel Vetter
> > Software Engineer, Intel Corporation
> > http://blog.ffwll.ch
> 
> -- 
> Rodrigo Siqueira
> https://siqueira.tech
> Graduate Student
> Department of Computer Science
> University of São Paulo


> _______________________________________________
> dri-devel mailing list
> dri-devel@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel


-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

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