Re: [PATCH v2 3/5] soundwire: qcom: add static port map support

[Srinivas Kandagatla]

On 09/03/2021 16:10, Pierre-Louis Bossart wrote:
> >       list_for_each_entry(m_rt, &bus->m_rt_list, bus_node) {
> > @@ -473,8 +475,13 @@ static int qcom_swrm_compute_params(struct 
> > sdw_bus *bus)
> >           }
> >           list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
> > +            slave = s_rt->slave;
> >               list_for_each_entry(p_rt, &s_rt->port_list, port_node) {
> > -                pcfg = &ctrl->pconfig[i];
> > +                m_port = slave->m_port_map[_rtp->num - 1];
> > +                if (m_port)
> > +                    pcfg = &ctrl->pconfig[m_port - 1];
> > +                else
> > +                    pcfg = &ctrl->pconfig[i];
>
> Maybe add a short comment on port allocation, I had to think a bit to 
> figure out why the -1 was required on both peripheral and manager but it 
> is not below [1]

I agree, will add some comment here to explain the offsets correctly!

--srini

> >                   p_rt->transport_params.port_num = p_rt->num;
> >                   p_rt->transport_params.sample_interval =
> >                       pcfg->si + 1;
> > @@ -535,8 +542,10 @@ static int qcom_swrm_stream_alloc_ports(struct 
> > qcom_swrm_ctrl *ctrl,
> >       struct sdw_master_runtime *m_rt;
> >       struct sdw_slave_runtime *s_rt;
> >       struct sdw_port_runtime *p_rt;
> > +    struct sdw_slave *slave;
> >       unsigned long *port_mask;
> >       int i, maxport, pn, nports = 0, ret = 0;
> > +    unsigned int m_port;
> >       mutex_lock(&ctrl->port_lock);
> >       list_for_each_entry(m_rt, &stream->master_list, stream_node) {
> > @@ -549,9 +558,15 @@ static int qcom_swrm_stream_alloc_ports(struct 
> > qcom_swrm_ctrl *ctrl,
> >           }
> >           list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
> > +            slave = s_rt->slave;
> >               list_for_each_entry(p_rt, &s_rt->port_list, port_node) {
> > +                m_port = slave->m_port_map[p_rt->num - 1];
> >                   /* Port numbers start from 1 - 14*/
> > -                pn = find_first_zero_bit(port_mask, maxport);
> > +                if (m_port)
> > +                    pn = m_port;
> > +                else
> > +                    pn = find_first_zero_bit(port_mask, maxport);
>
> [1]
>
> > +
> >                   if (pn > (maxport)) {
> >                       dev_err(ctrl->dev, "All ports busy\n");
> >                       ret = -EBUSY;