[PATCH v3 1/5] scsi: ufs: qcom: Fix acquiring the optional reset control line

[Manivannan Sadhasivam]

On Qcom UFS platforms, the reset control line seems to be optional
(for SoCs like MSM8996 and probably for others too). The current logic
tries to mimic the `devm_reset_control_get_optional()` API but it also
continues the probe if there is an error with the declared reset line in
DT/ACPI.

In an ideal case, if the reset line is not declared in DT/ACPI, the probe
should continue. But if there is problem in acquiring the declared reset
line (like EPROBE_DEFER) it should fail and return the appropriate error
code.

Reviewed-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
Reviewed-by: Andrew Halaney <ahalaney@xxxxxxxxxx>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
---
 drivers/scsi/ufs/ufs-qcom.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c
index 0d2e950d0865..9e69b9ac58f9 100644
--- a/drivers/scsi/ufs/ufs-qcom.c
+++ b/drivers/scsi/ufs/ufs-qcom.c
@@ -1002,13 +1002,12 @@ static int ufs_qcom_init(struct ufs_hba *hba)
 	host->hba = hba;
 	ufshcd_set_variant(hba, host);
 
-	/* Setup the reset control of HCI */
-	host->core_reset = devm_reset_control_get(hba->dev, "rst");
+	/* Setup the optional reset control of HCI */
+	host->core_reset = devm_reset_control_get_optional(hba->dev, "rst");
 	if (IS_ERR(host->core_reset)) {
-		err = PTR_ERR(host->core_reset);
-		dev_warn(dev, "Failed to get reset control %d\n", err);
-		host->core_reset = NULL;
-		err = 0;
+		err = dev_err_probe(dev, PTR_ERR(host->core_reset),
+				    "Failed to get reset control\n");
+		goto out_variant_clear;
 	}
 
 	/* Fire up the reset controller. Failure here is non-fatal. */
-- 
2.25.1