Re: [PATCH 06/11] scsi: ufs: core: Add support to retrain TX Equalization via debugfs

[Bart Van Assche <bvanassche@acm.org>]

On 2/27/26 8:08 AM, Can Guo wrote:
", 0200, hba->debugfs_root, hba,
> +			    &retrain_tx_eq_fops);
>   	for (attr = ufs_tx_eq_attrs; attr->name; attr++)
>   		debugfs_create_file(attr->name, attr->mode, root, (void *)attr,
>   				    attr->fops);

Instead of creating one retrain_tx_eq attribute, please create one such 
attribute in each gear directory.

> +static int ufshcd_retrain_tx_eq_prepare(struct ufs_hba *hba)
> +{
> +	int ret = 0;
> +
> +	mutex_lock(&hba->host->scan_mutex);
> +	blk_mq_quiesce_tagset(&hba->host->tag_set);
> +	down_write(&hba->clk_scaling_lock);
> +
> +	if (ufshcd_wait_for_pending_cmds(hba, 1 * USEC_PER_SEC)) {
> +		ret = -EBUSY;
> +		up_write(&hba->clk_scaling_lock);
> +		blk_mq_unquiesce_tagset(&hba->host->tag_set);
> +		mutex_unlock(&hba->host->scan_mutex);
> +		goto out;
> +	}
> +
> +	ufshcd_hold(hba);
> +
> +out:
> +	return ret;
> +}
> +
> +static void ufshcd_retrain_tx_eq_unprepare(struct ufs_hba *hba)
> +{
> +	up_write(&hba->clk_scaling_lock);
> +	blk_mq_unquiesce_tagset(&hba->host->tag_set);
> +	mutex_unlock(&hba->host->scan_mutex);
> +	ufshcd_release(hba);
> +}

Instead of duplicating some of the ufshcd_clock_scaling_prepare() /
ufshcd_clock_scaling_unprepare() code, please extract helper functions
from these functions for pausing and resuming command processing.
Additionally, please keep all code related to command processing in
ufshcd.c.

Thanks,

Bart.