linux-kernel - Re: [PATCH v2 34/35] drm/bridge: tc358768: Convert to atomic helpers

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Message-ID: <nbghrrl74xsuzomp7d6qjfosxfiooezipppjhxkx2ibnlpi6rj@b6ovgosmpuhl>
Date: Sun, 9 Feb 2025 09:13:36 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Maxime Ripard <mripard@...nel.org>
Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
	Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, 
	Simona Vetter <simona@...ll.ch>, Andrzej Hajda <andrzej.hajda@...el.com>, 
	Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>, 
	Laurent Pinchart <Laurent.pinchart@...asonboard.com>, Jonas Karlman <jonas@...boo.se>, 
	Jernej Skrabec <jernej.skrabec@...il.com>, Douglas Anderson <dianders@...omium.org>, 
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 34/35] drm/bridge: tc358768: Convert to atomic helpers

On Tue, Feb 04, 2025 at 03:58:02PM +0100, Maxime Ripard wrote:
> The tc358768 driver follows the drm_encoder->crtc pointer that is
> deprecated and shouldn't be used by atomic drivers.
> 
> This was due to the fact that we did't have any other alternative to
> retrieve the CRTC pointer. Fortunately, the crtc pointer is now provided
> in the bridge state, so we can move to atomic callbacks and drop that
> deprecated pointer usage.
> 
> Signed-off-by: Maxime Ripard <mripard@...nel.org>
> ---
>  drivers/gpu/drm/bridge/tc358768.c | 30 +++++++++++++++++++++++-------
>  1 file changed, 23 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/tc358768.c b/drivers/gpu/drm/bridge/tc358768.c
> index 6db18d1e8824dd7d387211d6d1e668645cf88bbe..6ff6b29e8075d7c6fa0b74b4fec83c5230512d96 100644
> --- a/drivers/gpu/drm/bridge/tc358768.c
> +++ b/drivers/gpu/drm/bridge/tc358768.c
> @@ -601,17 +601,29 @@ static void tc358768_bridge_disable(struct drm_bridge *bridge)
>  	ret = tc358768_clear_error(priv);
>  	if (ret)
>  		dev_warn(priv->dev, "Software disable failed: %d\n", ret);
>  }
>  
> +static void tc358768_bridge_atomic_disable(struct drm_bridge *bridge,
> +					   struct drm_atomic_state *state)
> +{
> +	tc358768_bridge_disable(bridge);
> +}
> +

Please change corresponding functions into atomic_disable() and
atomic_post_disable(). Calling sites have access to the atomic state, so
there is no need to have yet another wrapper.

>  static void tc358768_bridge_post_disable(struct drm_bridge *bridge)
>  {
>  	struct tc358768_priv *priv = bridge_to_tc358768(bridge);
>  
>  	tc358768_hw_disable(priv);
>  }
>  
> +static void tc358768_bridge_atomic_post_disable(struct drm_bridge *bridge,
> +						struct drm_atomic_state *state)
> +{
> +	tc358768_bridge_post_disable(bridge);
> +}
> +

-- 
With best wishes
Dmitry