Re: [PATCH 3/7] drm/i915: refactoring audio component functions

[Daniel Vetter <daniel@ffwll.ch>]

On Mon, Nov 30, 2015 at 02:37:47PM +0100, Takashi Iwai wrote:
> We have a common loop of encoder to look for the given audio port in
> two audio component functions.  Split out a local helper function to
> do it for the code simplification.
> 
> Signed-off-by: Takashi Iwai <tiwai@suse.de>
> ---
>  drivers/gpu/drm/i915/intel_audio.c | 61 ++++++++++++++++++++------------------
>  1 file changed, 32 insertions(+), 29 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_audio.c b/drivers/gpu/drm/i915/intel_audio.c
> index 6b318a8d5dc9..024e88ae6305 100644
> --- a/drivers/gpu/drm/i915/intel_audio.c
> +++ b/drivers/gpu/drm/i915/intel_audio.c
> @@ -630,17 +630,33 @@ static int i915_audio_component_get_cdclk_freq(struct device *dev)
>  	return ret;
>  }
>  
> +static struct intel_encoder *audio_port_to_encoder(struct drm_device *drm_dev,
> +						   int port)
> +{
> +	struct intel_encoder *intel_encoder;
> +	struct intel_digital_port *intel_dig_port;
> +
> +	for_each_intel_encoder(drm_dev, intel_encoder) {
> +		if (intel_encoder->type != INTEL_OUTPUT_HDMI &&
> +		    intel_encoder->type != INTEL_OUTPUT_DISPLAYPORT)
> +			continue;
> +		intel_dig_port = enc_to_dig_port(&intel_encoder->base);
> +		if (port == intel_dig_port->port)

If this is static, maybe just maintain a snd_pin_to_port mapping in
dev_priv? That's the approach we're usually taking, and it has the benefit
of making it clear(er) that the binding is static ... Or is it not?

Makes sense otherwise.
-Daniel

> +			return intel_encoder;
> +	}
> +	return NULL;
> +}
> +
>  static int i915_audio_component_sync_audio_rate(struct device *dev,
>  						int port, int rate)
>  {
>  	struct drm_i915_private *dev_priv = dev_to_i915(dev);
>  	struct drm_device *drm_dev = dev_priv->dev;
>  	struct intel_encoder *intel_encoder;
> -	struct intel_digital_port *intel_dig_port;
>  	struct intel_crtc *crtc;
>  	struct drm_display_mode *mode;
>  	struct i915_audio_component *acomp = dev_priv->audio_component;
> -	enum pipe pipe = -1;
> +	enum pipe pipe;
>  	u32 tmp;
>  	int n;
>  
> @@ -652,22 +668,14 @@ static int i915_audio_component_sync_audio_rate(struct device *dev,
>  
>  	mutex_lock(&dev_priv->av_mutex);
>  	/* 1. get the pipe */
> -	for_each_intel_encoder(drm_dev, intel_encoder) {
> -		if (intel_encoder->type != INTEL_OUTPUT_HDMI)
> -			continue;
> -		intel_dig_port = enc_to_dig_port(&intel_encoder->base);
> -		if (port == intel_dig_port->port) {
> -			crtc = to_intel_crtc(intel_encoder->base.crtc);
> -			pipe = crtc->pipe;
> -			break;
> -		}
> -	}
> -
> -	if (pipe == INVALID_PIPE) {
> +	intel_encoder = audio_port_to_encoder(drm_dev, port);
> +	if (!intel_encoder || intel_encoder->type != INTEL_OUTPUT_HDMI) {
>  		DRM_DEBUG_KMS("no pipe for the port %c\n", port_name(port));
>  		mutex_unlock(&dev_priv->av_mutex);
>  		return -ENODEV;
>  	}
> +	crtc = to_intel_crtc(intel_encoder->base.crtc);
> +	pipe = crtc->pipe;
>  	DRM_DEBUG_KMS("pipe %c connects port %c\n",
>  				  pipe_name(pipe), port_name(port));
>  	mode = &crtc->config->base.adjusted_mode;
> @@ -717,23 +725,18 @@ static int i915_audio_component_get_eld(struct device *dev, int port,
>  	int ret = -EINVAL;
>  
>  	mutex_lock(&dev_priv->av_mutex);
> -	for_each_intel_encoder(drm_dev, intel_encoder) {
> -		if (intel_encoder->type != INTEL_OUTPUT_DISPLAYPORT &&
> -		    intel_encoder->type != INTEL_OUTPUT_HDMI)
> -			continue;
> +	intel_encoder = audio_port_to_encoder(drm_dev, port);
> +	if (intel_encoder) {
> +		ret = 0;
>  		intel_dig_port = enc_to_dig_port(&intel_encoder->base);
> -		if (port == intel_dig_port->port) {
> -			ret = 0;
> -			*enabled = intel_dig_port->audio_enabled;
> -			if (!*enabled)
> -				break;
> +		*enabled = intel_dig_port->audio_enabled;
> +		if (*enabled) {
>  			connector = drm_select_eld(&intel_encoder->base);
> -			if (!connector)
> -				break;
> -			eld = connector->eld;
> -			ret = min(max_bytes, drm_eld_size(eld));
> -			memcpy(buf, eld, ret);
> -			break;
> +			if (connector) {
> +				eld = connector->eld;
> +				ret = min(max_bytes, drm_eld_size(eld));
> +				memcpy(buf, eld, ret);
> +			}
>  		}
>  	}
>  
> -- 
> 2.6.3
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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