linux-kernel - Re: [PATCH V2] drm/atomic-helper: Make atomic

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Date:   Mon, 25 Mar 2019 08:29:06 -0300
From:   Rodrigo Siqueira <rodrigosiqueiramelo@...il.com>
To:     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 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?
 
> > ---
> >  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

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