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SubjectRe: [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@intel.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@intel.com>
> Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.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

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