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

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Date:   Thu, 11 Mar 2021 14:29:14 +0000
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        broonie@...nel.org, vkoul@...nel.org
Cc:     robh@...nel.org, devicetree@...r.kernel.org,
        yung-chuan.liao@...ux.intel.com, sanyog.r.kale@...el.com,
        linux-kernel@...r.kernel.org, alsa-devel@...a-project.org
Subject: Re: [PATCH v2 3/5] soundwire: qcom: add static port map support



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;
>>