[PATCH 2/5] drm/omap: hdmi4: switch to the cec bridge ops

[Laurent Pinchart]

Hi Hans,

Thank you for the patch.

On Thu, Feb 11, 2021 at 11:37:00AM +0100, Hans Verkuil wrote:
> Implement the new CEC bridge ops. This makes it possible to associate
> a CEC adapter with a drm connector, which helps userspace determine
> with cec device node belongs to which drm connector.
> 
> Signed-off-by: Hans Verkuil <hverkuil-cisco at xs4all.nl>
> ---
>  drivers/gpu/drm/omapdrm/dss/hdmi4.c     | 28 +++++++++++++++++--------
>  drivers/gpu/drm/omapdrm/dss/hdmi4_cec.c |  8 ++++---
>  drivers/gpu/drm/omapdrm/dss/hdmi4_cec.h |  7 ++++---
>  3 files changed, 28 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/gpu/drm/omapdrm/dss/hdmi4.c b/drivers/gpu/drm/omapdrm/dss/hdmi4.c
> index 8de41e74e8f8..765379380d4b 100644
> --- a/drivers/gpu/drm/omapdrm/dss/hdmi4.c
> +++ b/drivers/gpu/drm/omapdrm/dss/hdmi4.c
> @@ -482,6 +482,21 @@ static struct edid *hdmi4_bridge_get_edid(struct drm_bridge *bridge,
>  	return edid;
>  }
>  
> +static int hdmi4_bridge_cec_init(struct drm_bridge *bridge,
> +				 struct drm_connector *conn)
> +{
> +	struct omap_hdmi *hdmi = drm_bridge_to_hdmi(bridge);
> +
> +	return hdmi4_cec_init(hdmi->pdev, &hdmi->core, &hdmi->wp, conn);
> +}
> +
> +static void hdmi4_bridge_cec_exit(struct drm_bridge *bridge)
> +{
> +	struct omap_hdmi *hdmi = drm_bridge_to_hdmi(bridge);
> +
> +	hdmi4_cec_uninit(&hdmi->core);
> +}
> +
>  static const struct drm_bridge_funcs hdmi4_bridge_funcs = {
>  	.attach = hdmi4_bridge_attach,
>  	.mode_set = hdmi4_bridge_mode_set,
> @@ -492,13 +507,15 @@ static const struct drm_bridge_funcs hdmi4_bridge_funcs = {
>  	.atomic_disable = hdmi4_bridge_disable,
>  	.hpd_notify = hdmi4_bridge_hpd_notify,
>  	.get_edid = hdmi4_bridge_get_edid,
> +	.cec_init = hdmi4_bridge_cec_init,
> +	.cec_exit = hdmi4_bridge_cec_exit,
>  };
>  
>  static void hdmi4_bridge_init(struct omap_hdmi *hdmi)
>  {
>  	hdmi->bridge.funcs = &hdmi4_bridge_funcs;
>  	hdmi->bridge.of_node = hdmi->pdev->dev.of_node;
> -	hdmi->bridge.ops = DRM_BRIDGE_OP_EDID;
> +	hdmi->bridge.ops = DRM_BRIDGE_OP_EDID | DRM_BRIDGE_OP_CEC;
>  	hdmi->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
>  
>  	drm_bridge_add(&hdmi->bridge);
> @@ -647,14 +664,10 @@ static int hdmi4_bind(struct device *dev, struct device *master, void *data)
>  	if (r)
>  		goto err_runtime_put;
>  
> -	r = hdmi4_cec_init(hdmi->pdev, &hdmi->core, &hdmi->wp);
> -	if (r)
> -		goto err_pll_uninit;

I'm wondering ifwe need to delay the creation of the CEC adapter until
the DRM connector is ready, or if we could only delay its registration ?
Catching errors related to adapter creation early could be nice, the
more error we have to handle at DRM bridge connector creation time, the
more complex the error handling will be for bridge support.

> -
>  	r = hdmi_audio_register(hdmi);
>  	if (r) {
>  		DSSERR("Registering HDMI audio failed\n");
> -		goto err_cec_uninit;
> +		goto err_pll_uninit;
>  	}
>  
>  	hdmi->debugfs = dss_debugfs_create_file(dss, "hdmi", hdmi_dump_regs,
> @@ -664,8 +677,6 @@ static int hdmi4_bind(struct device *dev, struct device *master, void *data)
>  
>  	return 0;
>  
> -err_cec_uninit:
> -	hdmi4_cec_uninit(&hdmi->core);
>  err_pll_uninit:
>  	hdmi_pll_uninit(&hdmi->pll);
>  err_runtime_put:
> @@ -682,7 +693,6 @@ static void hdmi4_unbind(struct device *dev, struct device *master, void *data)
>  	if (hdmi->audio_pdev)
>  		platform_device_unregister(hdmi->audio_pdev);
>  
> -	hdmi4_cec_uninit(&hdmi->core);
>  	hdmi_pll_uninit(&hdmi->pll);
>  }
>  
> diff --git a/drivers/gpu/drm/omapdrm/dss/hdmi4_cec.c b/drivers/gpu/drm/omapdrm/dss/hdmi4_cec.c
> index 43592c1cf081..64f5ccd0f11b 100644
> --- a/drivers/gpu/drm/omapdrm/dss/hdmi4_cec.c
> +++ b/drivers/gpu/drm/omapdrm/dss/hdmi4_cec.c
> @@ -335,10 +335,10 @@ void hdmi4_cec_set_phys_addr(struct hdmi_core_data *core, u16 pa)
>  }
>  
>  int hdmi4_cec_init(struct platform_device *pdev, struct hdmi_core_data *core,
> -		  struct hdmi_wp_data *wp)
> +		   struct hdmi_wp_data *wp, struct drm_connector *conn)
>  {
> -	const u32 caps = CEC_CAP_TRANSMIT | CEC_CAP_LOG_ADDRS |
> -			 CEC_CAP_PASSTHROUGH | CEC_CAP_RC;
> +	const u32 caps = CEC_CAP_DEFAULTS | CEC_CAP_CONNECTOR_INFO;
> +	struct cec_connector_info conn_info;
>  	int ret;
>  
>  	core->adap = cec_allocate_adapter(&hdmi_cec_adap_ops, core,
> @@ -346,6 +346,8 @@ int hdmi4_cec_init(struct platform_device *pdev, struct hdmi_core_data *core,
>  	ret = PTR_ERR_OR_ZERO(core->adap);
>  	if (ret < 0)
>  		return ret;
> +	cec_fill_conn_info_from_drm(&conn_info, conn);
> +	cec_s_conn_info(core->adap, &conn_info);
>  	core->wp = wp;
>  
>  	/* Disable clock initially, hdmi_cec_adap_enable() manages it */
> diff --git a/drivers/gpu/drm/omapdrm/dss/hdmi4_cec.h b/drivers/gpu/drm/omapdrm/dss/hdmi4_cec.h
> index 0292337c97cc..b59a54c3040e 100644
> --- a/drivers/gpu/drm/omapdrm/dss/hdmi4_cec.h
> +++ b/drivers/gpu/drm/omapdrm/dss/hdmi4_cec.h
> @@ -29,7 +29,7 @@ struct platform_device;
>  void hdmi4_cec_set_phys_addr(struct hdmi_core_data *core, u16 pa);
>  void hdmi4_cec_irq(struct hdmi_core_data *core);
>  int hdmi4_cec_init(struct platform_device *pdev, struct hdmi_core_data *core,
> -		  struct hdmi_wp_data *wp);
> +		   struct hdmi_wp_data *wp, struct drm_connector *conn);
>  void hdmi4_cec_uninit(struct hdmi_core_data *core);
>  #else
>  static inline void hdmi4_cec_set_phys_addr(struct hdmi_core_data *core, u16 pa)
> @@ -41,8 +41,9 @@ static inline void hdmi4_cec_irq(struct hdmi_core_data *core)
>  }
>  
>  static inline int hdmi4_cec_init(struct platform_device *pdev,
> -				struct hdmi_core_data *core,
> -				struct hdmi_wp_data *wp)
> +				 struct hdmi_core_data *core,
> +				 struct hdmi_wp_data *wp,
> +				 struct drm_connector *conn)
>  {
>  	return 0;
>  }

-- 
Regards,

Laurent Pinchart