Re: [PATCH v2 2/5] drm/i915: hdmi: add CEC notifier to intel_hdmi

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Fri, May 18, 2018 at 03:05:01PM +0200, Neil Armstrong wrote:
> This patchs adds the cec_notifier feature to the intel_hdmi part
> of the i915 DRM driver. It uses the HDMI DRM connector name to differentiate
> between each HDMI ports.
> The changes will allow the i915 HDMI code to notify EDID and HPD changes
> to an eventual CEC adapter.
> 
> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
> ---
>  drivers/gpu/drm/i915/Kconfig         |  1 +
>  drivers/gpu/drm/i915/intel_display.h | 20 ++++++++++++++++++++
>  drivers/gpu/drm/i915/intel_drv.h     |  2 ++
>  drivers/gpu/drm/i915/intel_hdmi.c    | 13 +++++++++++++
>  4 files changed, 36 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/Kconfig b/drivers/gpu/drm/i915/Kconfig
> index dfd9588..2d65d56 100644
> --- a/drivers/gpu/drm/i915/Kconfig
> +++ b/drivers/gpu/drm/i915/Kconfig
> @@ -23,6 +23,7 @@ config DRM_I915
>  	select SYNC_FILE
>  	select IOSF_MBI
>  	select CRC32
> +	select CEC_CORE if CEC_NOTIFIER
>  	help
>  	  Choose this option if you have a system that has "Intel Graphics
>  	  Media Accelerator" or "HD Graphics" integrated graphics,
> diff --git a/drivers/gpu/drm/i915/intel_display.h b/drivers/gpu/drm/i915/intel_display.h
> index 4e7418b..c68d1c8 100644
> --- a/drivers/gpu/drm/i915/intel_display.h
> +++ b/drivers/gpu/drm/i915/intel_display.h
> @@ -126,6 +126,26 @@ enum port {
>  
>  #define port_name(p) ((p) + 'A')
>  
> +static inline const char *port_identifier(enum port port)
> +{
> +	switch (port) {
> +	case PORT_A:
> +		return "Port A";
> +	case PORT_B:
> +		return "Port B";
> +	case PORT_C:
> +		return "Port C";
> +	case PORT_D:
> +		return "Port D";
> +	case PORT_E:
> +		return "Port E";
> +	case PORT_F:
> +		return "Port F";
> +	default:
> +		return "<invalid>";
> +	}
> +}

I don't think we need this in the header. A static function will do.

And I was actually thinking something a bit fancier like:
snprintf("%s/port-%s", dev_name(dev), port_id(port));

Oh, I see you already pass the device in so I guess we don't need
that in the port id?

> +
>  enum dpio_channel {
>  	DPIO_CH0,
>  	DPIO_CH1
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index d436858..b50e51b 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -39,6 +39,7 @@
>  #include <drm/drm_dp_mst_helper.h>
>  #include <drm/drm_rect.h>
>  #include <drm/drm_atomic.h>
> +#include <media/cec-notifier.h>
>  
>  /**
>   * __wait_for - magic wait macro
> @@ -1001,6 +1002,7 @@ struct intel_hdmi {
>  	bool has_audio;
>  	bool rgb_quant_range_selectable;
>  	struct intel_connector *attached_connector;
> +	struct cec_notifier *notifier;

I was wondering if we need any ifdefs around this stuff, but I guess not
since it's just a pointer and all the functions seem to have empty
static inlines for the CEC=n case.

>  };
>  
>  struct intel_dp_mst_encoder;
> diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
> index 1baef4a..d522b5b 100644
> --- a/drivers/gpu/drm/i915/intel_hdmi.c
> +++ b/drivers/gpu/drm/i915/intel_hdmi.c
> @@ -1868,6 +1868,8 @@ intel_hdmi_set_edid(struct drm_connector *connector)
>  		connected = true;
>  	}
>  
> +	cec_notifier_set_phys_addr_from_edid(intel_hdmi->notifier, edid);
> +
>  	return connected;
>  }
>  
> @@ -1876,6 +1878,7 @@ intel_hdmi_detect(struct drm_connector *connector, bool force)
>  {
>  	enum drm_connector_status status;
>  	struct drm_i915_private *dev_priv = to_i915(connector->dev);
> +	struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);
>  
>  	DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
>  		      connector->base.id, connector->name);
> @@ -1891,6 +1894,9 @@ intel_hdmi_detect(struct drm_connector *connector, bool force)
>  
>  	intel_display_power_put(dev_priv, POWER_DOMAIN_GMBUS);
>  
> +	if (status != connector_status_connected)
> +		cec_notifier_phys_addr_invalidate(intel_hdmi->notifier);
> +
>  	return status;
>  }
>  
> @@ -2031,6 +2037,8 @@ static void chv_hdmi_pre_enable(struct intel_encoder *encoder,
>  
>  static void intel_hdmi_destroy(struct drm_connector *connector)
>  {
> +	if (intel_attached_hdmi(connector)->notifier)
> +		cec_notifier_put(intel_attached_hdmi(connector)->notifier);
>  	kfree(to_intel_connector(connector)->detect_edid);
>  	drm_connector_cleanup(connector);
>  	kfree(connector);
> @@ -2358,6 +2366,11 @@ void intel_hdmi_init_connector(struct intel_digital_port *intel_dig_port,
>  		u32 temp = I915_READ(PEG_BAND_GAP_DATA);
>  		I915_WRITE(PEG_BAND_GAP_DATA, (temp & ~0xf) | 0xd);
>  	}
> +
> +	intel_hdmi->notifier = cec_notifier_get_conn(dev->dev,
> +						     port_identifier(port));
> +	if (!intel_hdmi->notifier)
> +		DRM_DEBUG_KMS("CEC notifier get failed\n");
>  }
>  
>  void intel_hdmi_init(struct drm_i915_private *dev_priv,
> -- 
> 2.7.4
> 
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-- 
Ville Syrjälä
Intel