[alsa-devel] [PATCH v5 07/13] soundwire: Add stream configuration APIs

[Sanyog Kale]

On Wed, Apr 25, 2018 at 03:09:17PM +0530, Vinod Koul wrote:
> From: Sanyog Kale <sanyog.r.kale at intel.com>
> 
> Add APIs for prepare, enable, disable and de-prepare stream.
> 
> Signed-off-by: Sanyog Kale <sanyog.r.kale at intel.com>
> Signed-off-by: Shreyas NC <shreyas.nc at intel.com>
> Signed-off-by: Vinod Koul <vkoul at kernel.org>
> ---
>  drivers/soundwire/bus.c       |   9 ++
>  drivers/soundwire/stream.c    | 246 ++++++++++++++++++++++++++++++++++++++++++
>  include/linux/soundwire/sdw.h |   4 +
>  3 files changed, 259 insertions(+)
> 
> +
> +static int _sdw_deprepare_stream(struct sdw_stream_runtime *stream)
> +{
> +	struct sdw_master_runtime *m_rt = stream->m_rt;
> +	struct sdw_bus *bus = m_rt->bus;
> +	int ret = 0;
> +
> +	/* De-prepare port(s) */
> +	ret = sdw_prep_deprep_ports(m_rt, false);
> +	if (ret < 0) {
> +		dev_err(bus->dev, "De-prepare port(s) failed: %d", ret);
> +		return ret;
> +	}
> +
> +	/* TODO: Update this during Device-Device support */
> +	bus->params.bandwidth -= m_rt->stream->params.rate *
> +		m_rt->ch_count * m_rt->stream->params.bps;
> +

We should have kept zero bandwidth check here because there is no need
to perform sdw_program_params when no stream is running on bus.

> +	/* Program params */
> +	ret = sdw_program_params(bus);
> +	if (ret < 0) {
> +		dev_err(bus->dev, "Program params failed: %d", ret);
> +		return ret;
> +	}
> +
> +	return do_bank_switch(stream);

Change the state to DEPREPARE and then return.

> +
> +	stream->state = SDW_STREAM_DEPREPARED;
> +
> +	return ret;
> +}
> +
>  
> -- 
> 2.7.4
> 

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