linux-kernel - Re: [PATCH v2 2/5] soundwire: qcom: update port map allocation bit mask

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Message-ID: <7f13d7c1-b61a-fd19-92b7-99ccc957750c@linaro.org>
Date:   Thu, 11 Mar 2021 14:29:19 +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 2/5] soundwire: qcom: update port map allocation bit
 mask



On 09/03/2021 15:55, Pierre-Louis Bossart wrote:
> 
> 
> On 3/9/21 8:15 AM, Srinivas Kandagatla wrote:
>> currently the internal bitmask used for allocating ports starts with 
>> offset 0.
>> This is bit confusing as data port numbers on Qualcomm controller are 
>> valid
>> from 1 to 14. So adjust this bit mask accordingly, this will also help 
>> while
>> adding static port map support.
>>
>> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
>> ---
>>   drivers/soundwire/qcom.c | 11 +++++++----
>>   1 file changed, 7 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/soundwire/qcom.c b/drivers/soundwire/qcom.c
>> index 6d22df01f354..f4f1c5f2af0b 100644
>> --- a/drivers/soundwire/qcom.c
>> +++ b/drivers/soundwire/qcom.c
>> @@ -519,7 +519,7 @@ static void qcom_swrm_stream_free_ports(struct 
>> qcom_swrm_ctrl *ctrl,
>>               port_mask = &ctrl->din_port_mask;
>>           list_for_each_entry(p_rt, &m_rt->port_list, port_node)
>> -            clear_bit(p_rt->num - 1, port_mask);
>> +            clear_bit(p_rt->num, port_mask);
>>       }
>>       mutex_unlock(&ctrl->port_lock);
>> @@ -552,13 +552,13 @@ static int qcom_swrm_stream_alloc_ports(struct 
>> qcom_swrm_ctrl *ctrl,
>>               list_for_each_entry(p_rt, &s_rt->port_list, port_node) {
>>                   /* Port numbers start from 1 - 14*/
>>                   pn = find_first_zero_bit(port_mask, maxport);
>> -                if (pn > (maxport - 1)) {
>> +                if (pn > (maxport)) {
> 
> nit-pick: useless parentheses

I agree, will remove this and address the other comment too in next spin!

--srini
> 
>>                       dev_err(ctrl->dev, "All ports busy\n");
>>                       ret = -EBUSY;
>>                       goto err;
>>                   }
>>                   set_bit(pn, port_mask);
>> -                pconfig[nports].num = pn + 1;
>> +                pconfig[nports].num = pn;
>>                   pconfig[nports].ch_mask = p_rt->ch_mask;
>>                   nports++;
>>               }
>> @@ -580,7 +580,7 @@ static int qcom_swrm_stream_alloc_ports(struct 
>> qcom_swrm_ctrl *ctrl,
>>   err:
>>       if (ret) {
>>           for (i = 0; i < nports; i++)
>> -            clear_bit(pconfig[i].num - 1, port_mask);
>> +            clear_bit(pconfig[i].num, port_mask);
>>       }
>>       mutex_unlock(&ctrl->port_lock);
>> @@ -754,6 +754,9 @@ static int qcom_swrm_get_port_config(struct 
>> qcom_swrm_ctrl *ctrl)
>>       ctrl->num_dout_ports = val;
>>       nports = ctrl->num_dout_ports + ctrl->num_din_ports;
>> +    /* port numbers are non zero, so mark port 0 */
> 
> mask?
> 
>> +    set_bit(0, &ctrl->dout_port_mask);
>> +    set_bit(0, &ctrl->din_port_mask);
>>       ret = of_property_read_u8_array(np, "qcom,ports-offset1",
>>                       off1, nports);
>>