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SubjectRe: [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@jmondi.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

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