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

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Date:   Fri, 7 Jun 2019 15:03:04 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Jacopo Mondi <jacopo+renesas@...ndi.org>
Cc:     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 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.

>  	}
>  
>  	drm_crtc_helper_add(crtc, &crtc_helper_funcs);
> 

-- 
Regards,

Laurent Pinchart