linux-kernel - Re: [PATCH 6/6] soundwire: stream: don't program ports for a stream that has not been prepared

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Date:   Fri, 10 Jan 2020 12:33:21 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        tiwai@...e.de, broonie@...nel.org, gregkh@...uxfoundation.org,
        jank@...ence.com, srinivas.kandagatla@...aro.org,
        slawomir.blauciak@...el.com,
        Bard liao <yung-chuan.liao@...ux.intel.com>,
        Rander Wang <rander.wang@...ux.intel.com>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        Rander Wang <rander.wang@...el.com>,
        Sanyog Kale <sanyog.r.kale@...el.com>
Subject: Re: [PATCH 6/6] soundwire: stream: don't program ports for a stream
 that has not been prepared

On 08-01-20, 11:54, Pierre-Louis Bossart wrote:
> From: Rander Wang <rander.wang@...el.com>
> 
> In the Intel QA multi-pipelines test case, there are two pipelines for
> playback and capture on the same bus. The test fails with an error
> when setting port params:
> 
> [  599.224812] rt711 sdw:0:25d:711:0: invalid dpn_prop direction 1 port_num 0
> [  599.224815] sdw_program_slave_port_params failed -22
> [  599.224819] intel-sdw sdw-master-0: Program transport params failed: -22
> [  599.224822] intel-sdw sdw-master-0: Program params failed: -22

side note, one of these above err logs should be removed :)

> [  599.224828] sdw_enable_stream: SDW0 Pin2-Playback: done
> 
> This problem is root-caused to the programming of the capture stream
> ports while it is not yet prepared, the calling sequence is:
> 
> (1) hw_params for playback. The playback stream provide the port
>     information to Bus.
> (2) stream_prepare for playback, Transport and port parameters
>     are computed for playback.
> (3) hw_params for capture. The capture stream provide the port
>     information to Bus, but it has not been prepared so is not
>     accounted for in the bandwidth allocation.
> (4) stream_enable for playback. Program transport and port parameters
>     for all masters and slaves. Since the transport and port parameters
>     are not computed for capture stream, sdw_program_slave_port_params
>     will generate a error when setting port params for capture.
> 
> in step (4), we should only program the ports for the stream that have
> been prepared. A stream that is only in CONFIGURED state should be
> ignored, its ports will be programmed when it becomes PREPARED.
> 
> Tested on Comet Lake.
> 
> GitHub issue: https://github.com/thesofproject/linux/issues/1637

This is not relevant for kernel, pls remove

> Signed-off-by: Rander Wang <rander.wang@...el.com>
> Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
> ---
>  drivers/soundwire/stream.c | 21 ++++++++++++++++-----
>  1 file changed, 16 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/soundwire/stream.c b/drivers/soundwire/stream.c
> index da10f38298c0..198372977187 100644
> --- a/drivers/soundwire/stream.c
> +++ b/drivers/soundwire/stream.c
> @@ -604,12 +604,23 @@ static int sdw_notify_config(struct sdw_master_runtime *m_rt)
>   *
>   * @bus: SDW bus instance
>   */
> -static int sdw_program_params(struct sdw_bus *bus)
> +static int sdw_program_params(struct sdw_bus *bus, bool prepare)
>  {
>  	struct sdw_master_runtime *m_rt;
>  	int ret = 0;
>  
>  	list_for_each_entry(m_rt, &bus->m_rt_list, bus_node) {
> +
> +		/*
> +		 * this loop walks through all master runtimes for a
> +		 * bus, but the ports can only be configured while
> +		 * explicitly preparing a stream or handling an
> +		 * already-prepared stream otherwise.

we can go upto 80 chars, make sure you align the above comment block as
such

> +		 */
> +		if (!prepare &&
> +		    m_rt->stream->state == SDW_STREAM_CONFIGURED)
> +			continue;
> +
>  		ret = sdw_program_port_params(m_rt);
>  		if (ret < 0) {
>  			dev_err(bus->dev,
> @@ -1502,7 +1513,7 @@ static int _sdw_prepare_stream(struct sdw_stream_runtime *stream,
>  
>  program_params:
>  		/* Program params */
> -		ret = sdw_program_params(bus);
> +		ret = sdw_program_params(bus, true);
>  		if (ret < 0) {
>  			dev_err(bus->dev, "Program params failed: %d\n", ret);
>  			goto restore_params;
> @@ -1602,7 +1613,7 @@ static int _sdw_enable_stream(struct sdw_stream_runtime *stream)
>  		bus = m_rt->bus;
>  
>  		/* Program params */
> -		ret = sdw_program_params(bus);
> +		ret = sdw_program_params(bus, false);
>  		if (ret < 0) {
>  			dev_err(bus->dev, "Program params failed: %d\n", ret);
>  			return ret;
> @@ -1687,7 +1698,7 @@ static int _sdw_disable_stream(struct sdw_stream_runtime *stream)
>  		struct sdw_bus *bus = m_rt->bus;
>  
>  		/* Program params */
> -		ret = sdw_program_params(bus);
> +		ret = sdw_program_params(bus, false);

Can you do a converse test as well, when the streams are running and
concurrently two stream are stopped, it would be good to get it confirmed...

>  		if (ret < 0) {
>  			dev_err(bus->dev, "Program params failed: %d\n", ret);
>  			return ret;
> @@ -1769,7 +1780,7 @@ static int _sdw_deprepare_stream(struct sdw_stream_runtime *stream)
>  			m_rt->ch_count * m_rt->stream->params.bps;
>  
>  		/* Program params */
> -		ret = sdw_program_params(bus);
> +		ret = sdw_program_params(bus, false);
>  		if (ret < 0) {
>  			dev_err(bus->dev, "Program params failed: %d\n", ret);
>  			return ret;
> -- 
> 2.20.1

-- 
~Vinod