linux-kernel - Re: [PATCH 19/20] drm: rcar-du: crtc: Register GAMMA

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Date:   Fri, 14 Jun 2019 10:15:52 +0200
From:   Jacopo Mondi <jacopo@...ndi.org>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     Jacopo Mondi <jacopo+renesas@...ndi.org>,
        kieran.bingham+renesas@...asonboard.com, airlied@...ux.ie,
        daniel@...ll.ch, koji.matsuoka.xm@...esas.com, muroya@....co.jp,
        VenkataRajesh.Kalakodima@...bosch.com,
        Harsha.ManjulaMallikarjun@...bosch.com,
        linux-renesas-soc@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 19/20] drm: rcar-du: crtc: Register GAMMA_LUT properties

Hi Laurent,
   thanks for review

On Fri, Jun 07, 2019 at 03:03:04PM +0300, Laurent Pinchart wrote:
> Hi Jacopo,
>
> Thank you for the patch.
>
> On Thu, Jun 06, 2019 at 04:22:19PM +0200, Jacopo Mondi wrote:
> > Enable the GAMMA_LUT KMS property using the framework helpers to
> > register the proeprty and the associated gamma table size maximum size.
> >
> > Signed-off-by: Jacopo Mondi <jacopo+renesas@...ndi.org>
> > ---
> >  drivers/gpu/drm/rcar-du/rcar_du_crtc.c | 3 +++
> >  1 file changed, 3 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
> > index e6d3df37c827..c920fb5dba65 100644
> > --- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
> > +++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
> > @@ -1207,6 +1207,9 @@ int rcar_du_crtc_create(struct rcar_du_group *rgrp, unsigned int swindex,
> >  	    rcdu->cmms[swindex]) {
> >  		rcrtc->cmm = rcdu->cmms[swindex];
> >  		rgrp->cmms_mask |= BIT(hwindex % 2);
> > +
> > +		drm_mode_crtc_set_gamma_size(crtc, CMM_GAMMA_LUT_SIZE);
> > +		drm_crtc_enable_color_mgmt(crtc, 0, false, CMM_GAMMA_LUT_SIZE);
>
> This change looks good, but you also need to add support for legacy API.
> According to the function's documentation,
>
>  * Drivers should use drm_atomic_helper_legacy_gamma_set() to implement the
>  * legacy &drm_crtc_funcs.gamma_set callback.
>

Drivers 'shuld' or drivers 'shall' ?
Isn't this required only to support the 'legacy APIs' ? Do we want that?

Thanks
   j

> >  	}
> >
> >  	drm_crtc_helper_add(crtc, &crtc_helper_funcs);
> >
>
> --
> Regards,
>
> Laurent Pinchart

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