Linux-ARM-Kernel Archive on lore.kernel.org

* Re: [PATCH 06/13] drm/meson: encoder_hdmi: Use bridge connector CEC notifier
From: Neil Armstrong @ 2026-05-19  7:30 UTC (permalink / raw)
  To: Jonas Karlman, Kevin Hilman, Heiko Stuebner, Maarten Lankhorst,
	Maxime Ripard, Thomas Zimmermann, David Airlie, Simona Vetter,
	Jerome Brunet, Martin Blumenstingl
  Cc: dri-devel, linux-amlogic, linux-arm-kernel, linux-kernel,
	linux-rockchip
In-Reply-To: <20260518194744.2483580-7-jonas@kwiboo.se>

On 5/18/26 21:47, Jonas Karlman wrote:
> The dw-hdmi bridge detect() func now updates EDID and CEC phys addr for
> the connector and any registered generic CEC notifier.
> 
> Replace the open-coded CEC notifier handling with use of the bridge CEC
> notifier op.
> 
> Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
> ---
>   drivers/gpu/drm/meson/Kconfig              |  1 +
>   drivers/gpu/drm/meson/meson_encoder_hdmi.c | 85 +++++-----------------
>   2 files changed, 19 insertions(+), 67 deletions(-)
> 
> diff --git a/drivers/gpu/drm/meson/Kconfig b/drivers/gpu/drm/meson/Kconfig
> index 417f79829cf8..0dc5ca21e4fc 100644
> --- a/drivers/gpu/drm/meson/Kconfig
> +++ b/drivers/gpu/drm/meson/Kconfig
> @@ -13,6 +13,7 @@ config DRM_MESON
>   	select REGMAP_MMIO
>   	select MESON_CANVAS
>   	select CEC_CORE if CEC_NOTIFIER
> +	select DRM_DISPLAY_HDMI_CEC_NOTIFIER_HELPER if CEC_NOTIFIER
>   
>   config DRM_MESON_DW_HDMI
>   	tristate "HDMI Synopsys Controller support for Amlogic Meson Display"
> diff --git a/drivers/gpu/drm/meson/meson_encoder_hdmi.c b/drivers/gpu/drm/meson/meson_encoder_hdmi.c
> index 1b9a1d9ed3d3..45104ef35344 100644
> --- a/drivers/gpu/drm/meson/meson_encoder_hdmi.c
> +++ b/drivers/gpu/drm/meson/meson_encoder_hdmi.c
> @@ -16,8 +16,6 @@
>   #include <linux/regulator/consumer.h>
>   #include <linux/reset.h>
>   
> -#include <media/cec-notifier.h>
> -
>   #include <drm/drm_atomic_helper.h>
>   #include <drm/drm_bridge.h>
>   #include <drm/drm_bridge_connector.h>
> @@ -41,7 +39,6 @@ struct meson_encoder_hdmi {
>   	struct drm_connector *connector;
>   	struct meson_drm *priv;
>   	unsigned long output_bus_fmt;
> -	struct cec_notifier *cec_notifier;
>   };
>   
>   #define bridge_to_meson_encoder_hdmi(x) \
> @@ -57,14 +54,6 @@ static int meson_encoder_hdmi_attach(struct drm_bridge *bridge,
>   				 &encoder_hdmi->bridge, flags);
>   }
>   
> -static void meson_encoder_hdmi_detach(struct drm_bridge *bridge)
> -{
> -	struct meson_encoder_hdmi *encoder_hdmi = bridge_to_meson_encoder_hdmi(bridge);
> -
> -	cec_notifier_conn_unregister(encoder_hdmi->cec_notifier);
> -	encoder_hdmi->cec_notifier = NULL;
> -}
> -
>   static void meson_encoder_hdmi_set_vclk(struct meson_encoder_hdmi *encoder_hdmi,
>   					const struct drm_display_mode *mode)
>   {
> @@ -321,27 +310,9 @@ static int meson_encoder_hdmi_atomic_check(struct drm_bridge *bridge,
>   	return 0;
>   }
>   
> -static void meson_encoder_hdmi_hpd_notify(struct drm_bridge *bridge,
> -					  struct drm_connector *connector,
> -					  enum drm_connector_status status)
> -{
> -	struct meson_encoder_hdmi *encoder_hdmi = bridge_to_meson_encoder_hdmi(bridge);
> -
> -	if (!encoder_hdmi->cec_notifier)
> -		return;
> -
> -	if (status == connector_status_connected)
> -		cec_notifier_set_phys_addr(encoder_hdmi->cec_notifier,
> -					   connector->display_info.source_physical_address);
> -	else
> -		cec_notifier_phys_addr_invalidate(encoder_hdmi->cec_notifier);
> -}
> -
>   static const struct drm_bridge_funcs meson_encoder_hdmi_bridge_funcs = {
>   	.attach = meson_encoder_hdmi_attach,
> -	.detach = meson_encoder_hdmi_detach,
>   	.mode_valid = meson_encoder_hdmi_mode_valid,
> -	.hpd_notify = meson_encoder_hdmi_hpd_notify,
>   	.atomic_enable = meson_encoder_hdmi_atomic_enable,
>   	.atomic_disable = meson_encoder_hdmi_atomic_disable,
>   	.atomic_get_input_bus_fmts = meson_encoder_hdmi_get_inp_bus_fmts,
> @@ -374,9 +345,9 @@ int meson_encoder_hdmi_probe(struct meson_drm *priv)
>   
>   	meson_encoder_hdmi->bridge.next_bridge = of_drm_find_and_get_bridge(remote);
>   	if (!meson_encoder_hdmi->bridge.next_bridge) {
> -		ret = dev_err_probe(priv->dev, -EPROBE_DEFER,
> -				    "Failed to find HDMI transceiver bridge\n");
> -		goto err_put_node;
> +		of_node_put(remote);
> +		return dev_err_probe(priv->dev, -EPROBE_DEFER,
> +				     "Failed to find HDMI transceiver bridge\n");
>   	}
>   
>   	/* HDMI Encoder Bridge */
> @@ -384,6 +355,13 @@ int meson_encoder_hdmi_probe(struct meson_drm *priv)
>   	meson_encoder_hdmi->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
>   	meson_encoder_hdmi->bridge.interlace_allowed = true;
>   
> +	pdev = of_find_device_by_node(remote);
> +	of_node_put(remote);
> +	if (pdev) {
> +		meson_encoder_hdmi->bridge.ops |= DRM_BRIDGE_OP_HDMI_CEC_NOTIFIER;
> +		meson_encoder_hdmi->bridge.hdmi_cec_dev = &pdev->dev;
> +	}
> +
>   	drm_bridge_add(&meson_encoder_hdmi->bridge);
>   
>   	meson_encoder_hdmi->priv = priv;
> @@ -391,30 +369,24 @@ int meson_encoder_hdmi_probe(struct meson_drm *priv)
>   	/* Encoder */
>   	ret = drm_simple_encoder_init(priv->drm, &meson_encoder_hdmi->encoder,
>   				      DRM_MODE_ENCODER_TMDS);
> -	if (ret) {
> -		dev_err_probe(priv->dev, ret, "Failed to init HDMI encoder\n");
> -		goto err_put_node;
> -	}
> +	if (ret)
> +		return dev_err_probe(priv->dev, ret, "Failed to init HDMI encoder\n");
>   
>   	meson_encoder_hdmi->encoder.possible_crtcs = BIT(0);
>   
>   	/* Attach HDMI Encoder Bridge to Encoder */
>   	ret = drm_bridge_attach(&meson_encoder_hdmi->encoder, &meson_encoder_hdmi->bridge, NULL,
>   				DRM_BRIDGE_ATTACH_NO_CONNECTOR);
> -	if (ret) {
> -		dev_err_probe(priv->dev, ret, "Failed to attach bridge\n");
> -		goto err_put_node;
> -	}
> +	if (ret)
> +		return dev_err_probe(priv->dev, ret, "Failed to attach bridge\n");
>   
>   	/* Initialize & attach Bridge Connector */
>   	meson_encoder_hdmi->connector = drm_bridge_connector_init(priv->drm,
>   							&meson_encoder_hdmi->encoder);
> -	if (IS_ERR(meson_encoder_hdmi->connector)) {
> -		ret = dev_err_probe(priv->dev,
> -				    PTR_ERR(meson_encoder_hdmi->connector),
> -				    "Unable to create HDMI bridge connector\n");
> -		goto err_put_node;
> -	}
> +	if (IS_ERR(meson_encoder_hdmi->connector))
> +		return dev_err_probe(priv->dev,
> +				     PTR_ERR(meson_encoder_hdmi->connector),
> +				     "Unable to create HDMI bridge connector\n");
>   
>   	/*
>   	 * We should have now in place:
> @@ -437,32 +409,11 @@ int meson_encoder_hdmi_probe(struct meson_drm *priv)
>   	/* Handle this here until handled by drm_bridge_connector_init() */
>   	meson_encoder_hdmi->connector->ycbcr_420_allowed = true;
>   
> -	pdev = of_find_device_by_node(remote);
> -	of_node_put(remote);
> -	if (pdev) {
> -		struct cec_connector_info conn_info;
> -		struct cec_notifier *notifier;
> -
> -		cec_fill_conn_info_from_drm(&conn_info, meson_encoder_hdmi->connector);
> -
> -		notifier = cec_notifier_conn_register(&pdev->dev, NULL, &conn_info);
> -		if (!notifier) {
> -			put_device(&pdev->dev);
> -			return -ENOMEM;
> -		}
> -
> -		meson_encoder_hdmi->cec_notifier = notifier;
> -	}
> -
>   	priv->encoders[MESON_ENC_HDMI] = meson_encoder_hdmi;
>   
>   	dev_dbg(priv->dev, "HDMI encoder initialized\n");
>   
>   	return 0;
> -
> -err_put_node:
> -	of_node_put(remote);
> -	return ret;
>   }
>   
>   void meson_encoder_hdmi_remove(struct meson_drm *priv)

Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>

Thanks,
Neil


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