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

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Message-ID: <ab00438b-dbb9-e6c6-019a-d50494e5dee1@linux.intel.com>
Date:   Mon, 8 Mar 2021 09:56:35 -0600
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        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


> +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