linux-kernel - Re: [PATCH v3 8/9] soundwire: qcom: add auto enumeration support

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Message-ID: <6050461e-5594-6272-e0ef-2ebdc271d809@linaro.org>
Date:   Mon, 8 Mar 2021 16:16:11 +0000
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        vkoul@...nel.org
Cc:     yung-chuan.liao@...ux.intel.com, sanyog.r.kale@...el.com,
        linux-kernel@...r.kernel.org, alsa-devel@...a-project.org
Subject: Re: [PATCH v3 8/9] soundwire: qcom: add auto enumeration support



On 08/03/2021 15:56, Pierre-Louis Bossart wrote:
> 
>> +static int qcom_swrm_enumerate(struct sdw_bus *bus)
>> +{
>> +    struct qcom_swrm_ctrl *ctrl = to_qcom_sdw(bus);
>> +    struct sdw_slave *slave, *_s;
>> +    struct sdw_slave_id id;
>> +    u32 val1, val2;
>> +    bool found;
>> +    u64 addr;
>> +    int i;
>> +    char *buf1 = (char *)&val1, *buf2 = (char *)&val2;
>> +
>> +    for (i = 1; i <= SDW_MAX_DEVICES; i++) {
>> +        /*SCP_Devid5 - Devid 4*/
>> +        ctrl->reg_read(ctrl, SWRM_ENUMERATOR_SLAVE_DEV_ID_1(i), &val1);
>> +
>> +        /*SCP_Devid3 - DevId 2 Devid 1 Devid 0*/
>> +        ctrl->reg_read(ctrl, SWRM_ENUMERATOR_SLAVE_DEV_ID_2(i), &val2);
>> +
>> +        if (!val1 && !val2)
>> +            break;
>> +
>> +        addr = buf2[1] | (buf2[0] << 8) | (buf1[3] << 16) |
>> +            ((u64)buf1[2] << 24) | ((u64)buf1[1] << 32) |
>> +            ((u64)buf1[0] << 40);
>> +
>> +        sdw_extract_slave_id(bus, addr, &id);
>> +        found = false;
>> +        /* Now compare with entries */
>> +        list_for_each_entry_safe(slave, _s, &bus->slaves, node) {
>> +            if (sdw_compare_devid(slave, id) == 0) {
>> +                u32 status = qcom_swrm_get_n_device_status(ctrl, i);
>> +
>> +                found = true;
>> +                if (status == SDW_SLAVE_ATTACHED) {
>> +                    slave->dev_num = i;
>> +                    mutex_lock(&bus->bus_lock);
>> +                    set_bit(i, bus->assigned);
>> +                    mutex_unlock(&bus->bus_lock);
>> +
>> +                }
> 
> you haven't changed that part, if the device is not in DT we should 
> still set bus->assigned::i

My bad! I missed it again!

Will fix it in next spin!


--srini