Date:	Thu, 02 Jun 2016 23:57:14 +0300
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	Boris Brezillon <boris.brezillon@...e-electrons.com>
Cc:	David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
	dri-devel@...ts.freedesktop.org,
	Daniel Vetter <daniel.vetter@...el.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Kukjin Kim <kgene@...nel.org>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	linux-samsung-soc@...r.kernel.org, intel-gfx@...ts.freedesktop.org,
	Jani Nikula <jani.nikula@...ux.intel.com>,
	Alexey Brodkin <abrodkin@...opsys.com>,
	Inki Dae <inki.dae@...sung.com>,
	Joonyoung Shim <jy0922.shim@...sung.com>,
	Seung-Woo Kim <sw0312.kim@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Stefan Agner <stefan@...er.ch>,
	Alison Wang <alison.wang@...escale.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
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	Mark Yao <mark.yao@...k-chips.com>,
	Heiko Stuebner <heiko@...ech.de>,
	Benjamin Gaignard <benjamin.gaignard@...aro.org>,
	Vincent Abriou <vincent.abriou@...com>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Chen-Yu Tsai <wens@...e.org>,
	Thierry Re ding <thierry.reding@...il.com>,
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	Eric Anholt <eric@...olt.net>,
	Gerd Hoffmann <kraxel@...hat.com>,
	linux-mediatek@...ts.infradead.org, linux-arm-msm@...r.kernel.org,
	freedreno@...ts.freedesktop.org, linux-renesas-soc@...r.kernel.org,
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Subject: Re: [PATCH 09/20] drm: rcar-du: Rely on the default ->best_encoder() behavior

Hi Boris,

Thank you for the patch.

On Thursday 02 Jun 2016 16:31:36 Boris Brezillon wrote:
> All outputs have a 1:1 relationship between connectors and encoders,
> and the driver is relying on the atomic helpers: we can drop the custom
> ->best_encoder() implementations and let the core call
> drm_atomic_helper_best_encoder() for us.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
> ---
>  drivers/gpu/drm/rcar-du/rcar_du_encoder.c | 12 ------------
>  drivers/gpu/drm/rcar-du/rcar_du_encoder.h |  3 ---
>  drivers/gpu/drm/rcar-du/rcar_du_hdmicon.c |  1 -
>  drivers/gpu/drm/rcar-du/rcar_du_lvdscon.c |  1 -
>  drivers/gpu/drm/rcar-du/rcar_du_vgacon.c  |  1 -
>  5 files changed, 18 deletions(-)
> 
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_encoder.c
> b/drivers/gpu/drm/rcar-du/rcar_du_encoder.c index 4e939e4..55149e9 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_du_encoder.c
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_encoder.c
> @@ -27,18 +27,6 @@
>  #include "rcar_du_vgacon.h"
> 
>  /*
> ---------------------------------------------------------------------------
> -- - * Common connector functions
> - */
> -
> -struct drm_encoder *
> -rcar_du_connector_best_encoder(struct drm_connector *connector)
> -{
> -	struct rcar_du_connector *rcon = to_rcar_connector(connector);
> -
> -	return rcar_encoder_to_drm_encoder(rcon->encoder);
> -}
> -
> -/*
> ---------------------------------------------------------------------------
> -- * Encoder
>   */
> 
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_encoder.h
> b/drivers/gpu/drm/rcar-du/rcar_du_encoder.h index 719b6f2a..a8669c3 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_du_encoder.h
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_encoder.h
> @@ -49,9 +49,6 @@ struct rcar_du_connector {
>  #define to_rcar_connector(c) \
>  	container_of(c, struct rcar_du_connector, connector)
> 
> -struct drm_encoder *
> -rcar_du_connector_best_encoder(struct drm_connector *connector);
> -
>  int rcar_du_encoder_init(struct rcar_du_device *rcdu,
>  			 enum rcar_du_encoder_type type,
>  			 enum rcar_du_output output,
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_hdmicon.c
> b/drivers/gpu/drm/rcar-du/rcar_du_hdmicon.c index 6c92714..612b4d5 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_du_hdmicon.c
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_hdmicon.c
> @@ -52,7 +52,6 @@ static int rcar_du_hdmi_connector_mode_valid(struct
> drm_connector *connector, static const struct drm_connector_helper_funcs
> connector_helper_funcs = { .get_modes = rcar_du_hdmi_connector_get_modes,
>  	.mode_valid = rcar_du_hdmi_connector_mode_valid,
> -	.best_encoder = rcar_du_connector_best_encoder,
>  };
> 
>  static enum drm_connector_status
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_lvdscon.c
> b/drivers/gpu/drm/rcar-du/rcar_du_lvdscon.c index e905f5d..6afd0af 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_du_lvdscon.c
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_lvdscon.c
> @@ -59,7 +59,6 @@ static int rcar_du_lvds_connector_get_modes(struct
> drm_connector *connector)
> 
>  static const struct drm_connector_helper_funcs connector_helper_funcs = {
>  	.get_modes = rcar_du_lvds_connector_get_modes,
> -	.best_encoder = rcar_du_connector_best_encoder,
>  };
> 
>  static enum drm_connector_status
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_vgacon.c
> b/drivers/gpu/drm/rcar-du/rcar_du_vgacon.c index 9d7e5c9..68f7ffa 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_du_vgacon.c
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_vgacon.c
> @@ -28,7 +28,6 @@ static int rcar_du_vga_connector_get_modes(struct
> drm_connector *connector)
> 
>  static const struct drm_connector_helper_funcs connector_helper_funcs = {
>  	.get_modes = rcar_du_vga_connector_get_modes,
> -	.best_encoder = rcar_du_connector_best_encoder,
>  };
> 
>  static enum drm_connector_status

You can also remove

        rcon->encoder = renc;

from rcar_du_vga_connector_init(), it's not needed anymore. The same code in 
rcar_du_hdmi_connector_init() has to stay for now though, as it's used to 
locate the slave encoder in the HDMI support code. That should change when the 
driver will be converted to use drm_bridge.

I can also fix this during the conversion to drm_bridge if you don't want to 
resubmit. In any case,

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

-- 
Regards,

Laurent Pinchart

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