linux-kernel - Re: [PATCH v4 02/11] drm/bridge: cdns-dsi: Move to devm_drm_of_get

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Date: Wed, 26 Jun 2024 13:10:39 +0300
From: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
To: Aradhya Bhatia <a-bhatia1@...com>,
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
 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>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Jyri Sarha <jyri.sarha@....fi>,
 Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>,
 Daniel Vetter <daniel@...ll.ch>
Cc: DRI Development List <dri-devel@...ts.freedesktop.org>,
 Linux Kernel List <linux-kernel@...r.kernel.org>,
 Dominik Haller <d.haller@...tec.de>, Sam Ravnborg <sam@...nborg.org>,
 Thierry Reding <treding@...dia.com>,
 Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
 Nishanth Menon <nm@...com>, Vignesh Raghavendra <vigneshr@...com>,
 Praneeth Bajjuri <praneeth@...com>, Udit Kumar <u-kumar1@...com>,
 Devarsh Thakkar <devarsht@...com>, Jayesh Choudhary <j-choudhary@...com>,
 Jai Luthra <j-luthra@...com>
Subject: Re: [PATCH v4 02/11] drm/bridge: cdns-dsi: Move to
 devm_drm_of_get_bridge()

On 22/06/2024 14:09, Aradhya Bhatia wrote:
> Instead of manually finding the next bridge/panel, and maintaining the
> panel-bridge (in-case the next entity is a panel), switch to using the
> automatically managing devm_drm_of_get_bridge() API.
> 
> Drop the drm_panel support completely from the driver while at it.
> 
> Signed-off-by: Aradhya Bhatia <a-bhatia1@...com>

Reviewed-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>

  Tomi

> ---
>   .../gpu/drm/bridge/cadence/cdns-dsi-core.c    | 28 ++-----------------
>   .../gpu/drm/bridge/cadence/cdns-dsi-core.h    |  2 --
>   2 files changed, 3 insertions(+), 27 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c b/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c
> index b016f2ba06bb..5159c3f0853e 100644
> --- a/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c
> +++ b/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c
> @@ -920,8 +920,6 @@ static int cdns_dsi_attach(struct mipi_dsi_host *host,
>   	struct cdns_dsi_output *output = &dsi->output;
>   	struct cdns_dsi_input *input = &dsi->input;
>   	struct drm_bridge *bridge;
> -	struct drm_panel *panel;
> -	struct device_node *np;
>   	int ret;
>   
>   	/*
> @@ -939,26 +937,10 @@ static int cdns_dsi_attach(struct mipi_dsi_host *host,
>   	/*
>   	 * The host <-> device link might be described using an OF-graph
>   	 * representation, in this case we extract the device of_node from
> -	 * this representation, otherwise we use dsidev->dev.of_node which
> -	 * should have been filled by the core.
> +	 * this representation.
>   	 */
> -	np = of_graph_get_remote_node(dsi->base.dev->of_node, DSI_OUTPUT_PORT,
> -				      dev->channel);
> -	if (!np)
> -		np = of_node_get(dev->dev.of_node);
> -
> -	panel = of_drm_find_panel(np);
> -	if (!IS_ERR(panel)) {
> -		bridge = drm_panel_bridge_add_typed(panel,
> -						    DRM_MODE_CONNECTOR_DSI);
> -	} else {
> -		bridge = of_drm_find_bridge(np);
> -		if (!bridge)
> -			bridge = ERR_PTR(-EINVAL);
> -	}
> -
> -	of_node_put(np);
> -
> +	bridge = devm_drm_of_get_bridge(dsi->base.dev, dsi->base.dev->of_node,
> +					DSI_OUTPUT_PORT, dev->channel);
>   	if (IS_ERR(bridge)) {
>   		ret = PTR_ERR(bridge);
>   		dev_err(host->dev, "failed to add DSI device %s (err = %d)",
> @@ -968,7 +950,6 @@ static int cdns_dsi_attach(struct mipi_dsi_host *host,
>   
>   	output->dev = dev;
>   	output->bridge = bridge;
> -	output->panel = panel;
>   
>   	/*
>   	 * The DSI output has been properly configured, we can now safely
> @@ -984,12 +965,9 @@ static int cdns_dsi_detach(struct mipi_dsi_host *host,
>   			   struct mipi_dsi_device *dev)
>   {
>   	struct cdns_dsi *dsi = to_cdns_dsi(host);
> -	struct cdns_dsi_output *output = &dsi->output;
>   	struct cdns_dsi_input *input = &dsi->input;
>   
>   	drm_bridge_remove(&input->bridge);
> -	if (output->panel)
> -		drm_panel_bridge_remove(output->bridge);
>   
>   	return 0;
>   }
> diff --git a/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.h b/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.h
> index ca7ea2da635c..5db5dbbbcaad 100644
> --- a/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.h
> +++ b/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.h
> @@ -10,7 +10,6 @@
>   
>   #include <drm/drm_bridge.h>
>   #include <drm/drm_mipi_dsi.h>
> -#include <drm/drm_panel.h>
>   
>   #include <linux/bits.h>
>   #include <linux/completion.h>
> @@ -21,7 +20,6 @@ struct reset_control;
>   
>   struct cdns_dsi_output {
>   	struct mipi_dsi_device *dev;
> -	struct drm_panel *panel;
>   	struct drm_bridge *bridge;
>   	union phy_configure_opts phy_opts;
>   };