scsi: ufs: Do not reset error history during host reset

Currently UFS error history will be reset and lost during host reset flow
by ufschd_probe_hba().

Avoid resetting it so error history can be kept as complete as possible to
improve debugging.

In addition, fix a minor display error in ufshcd_print_err_hist().

[mkp: commit desc clarification]
Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
Reviewed-by: Avri Altman <avri.altman@wdc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/ufs/ufshcd.c

@@ -402,7 +402,7 @@ static void ufshcd_print_err_hist(struct ufs_hba *hba,
 
 		if (err_hist->reg[p] == 0)
 			continue;
-		dev_err(hba->dev, "%s[%d] = 0x%x at %lld us\n", err_name, i,
+		dev_err(hba->dev, "%s[%d] = 0x%x at %lld us\n", err_name, p,
 			err_hist->reg[p], ktime_to_us(err_hist->tstamp[p]));
 		found = true;
 	}
@@ -6689,19 +6689,8 @@ static void ufshcd_tune_unipro_params(struct ufs_hba *hba)
 
 static void ufshcd_clear_dbg_ufs_stats(struct ufs_hba *hba)
 {
-	int err_reg_hist_size = sizeof(struct ufs_err_reg_hist);
-
 	hba->ufs_stats.hibern8_exit_cnt = 0;
 	hba->ufs_stats.last_hibern8_exit_tstamp = ktime_set(0, 0);
-
-	memset(&hba->ufs_stats.pa_err, 0, err_reg_hist_size);
-	memset(&hba->ufs_stats.dl_err, 0, err_reg_hist_size);
-	memset(&hba->ufs_stats.nl_err, 0, err_reg_hist_size);
-	memset(&hba->ufs_stats.tl_err, 0, err_reg_hist_size);
-	memset(&hba->ufs_stats.dme_err, 0, err_reg_hist_size);
-	memset(&hba->ufs_stats.fatal_err, 0, err_reg_hist_size);
-	memset(&hba->ufs_stats.auto_hibern8_err, 0, err_reg_hist_size);
-
 	hba->req_abort_count = 0;
 }