[alsa-devel] [RFC 4/6] drm: sti: Add ASoC generic hdmi codec support.

[Russell King - ARM Linux]

On Tue, Jan 19, 2016 at 02:40:34PM +0100, Arnaud Pouliquen wrote:
> +	/* update N parameter */
> +	ret = hdmi_audio_compute_n_cts(params->sample_rate,
> +				       hdmi->mode.clock, &n_cts);
> +	if (ret < 0)
> +		return ret;
> +
> +	DRM_DEBUG_DRIVER("sample_frequency= %d, pix clock = %d\n",
> +			 params->sample_rate, hdmi->mode.clock);
> +	DRM_DEBUG_DRIVER("n= %d, cts = %d\n", n_cts.n, n_cts.cts);
> +
> +	hdmi_write(hdmi, n_cts.n, HDMI_AUDN);

This looks like you only make use of the N parameter, which suggests
that your hardware measures the CTS parameter itself - which means
you have the non-coherent clock case.  You'll want to refer to the
HDMI specs and use different N values from the coherent case.

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