From: Gilad Broner
Different platforms may have different number of lanes for the UFS link.
Add parameter to device tree specifying how many lanes should be
configured for the UFS link. And don't print err message for clocks
that are optional, this leads to unnecessary confusion about failure.
Signed-off-by: Gilad Broner
Signed-off-by: Subhash Jadavani
Signed-off-by: Can Guo
diff --git a/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt
b/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt
index 5357919..4cee3f9 100644
--- a/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt
+++ b/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt
@@ -31,6 +31,9 @@ Optional properties:
defined or a value in the array is "0" then it is
assumed
that the frequency is set by the parent clock or a
fixed rate clock source.
+- lanes-per-direction: number of lanes available per direction - either 1 or 2.
+ Note that it is assume same number of lanes is used
both directions at once.
+ If not specified, default is 2 lanes per direction.
Note: If above properties are not defined it can be assumed that the supply
regulators or clocks are always on.
diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c
index 4cdffa4..84d37e9 100644
--- a/drivers/scsi/ufs/ufs-qcom.c
+++ b/drivers/scsi/ufs/ufs-qcom.c
@@ -50,13 +50,10 @@ static int ufs_qcom_host_clk_get(struct device *dev,
int err = 0;
clk = devm_clk_get(dev, name);
- if (IS_ERR(clk)) {
+ if (IS_ERR(clk))
err = PTR_ERR(clk);
- dev_err(dev, "%s: failed to get %s err %d",
- __func__, name, err);
- } else {
+ else
*clk_out = clk;
- }
return err;
}
@@ -78,9 +75,11 @@ static void ufs_qcom_disable_lane_clks(struct ufs_qcom_host
*host)
if (!host->is_lane_clks_enabled)
return;
- clk_disable_unprepare(host->tx_l1_sync_clk);
+ if (host->tx_l1_sync_clk)
+ clk_disable_unprepare(host->tx_l1_sync_clk);
clk_disable_unprepare(host->tx_l0_sync_clk);
- clk_disable_unprepare(host->rx_l1_sync_clk);
+ if (host->rx_l1_sync_clk)
+ clk_disable_unprepare(host->rx_l1_sync_clk);
clk_disable_unprepare(host->rx_l0_sync_clk);
host->is_lane_clks_enabled = false;
@@ -104,21 +103,21 @@ static int ufs_qcom_enable_lane_clks(struct ufs_qcom_host
*host)
if (err)
goto disable_rx_l0;
- err = ufs_qcom_host_clk_enable(dev, "rx_lane1_sync_clk",
- host->rx_l1_sync_clk);
- if (err)
- goto disable_tx_l0;
+ if (host->hba->lanes_per_direction > 1) {
+ err = ufs_qcom_host_clk_enable(dev, "rx_lane1_sync_clk",
+ host->rx_l1_sync_clk);
+ if (err)
+ goto disable_tx_l0;
- err = ufs_qcom_host_clk_enable(dev, "tx_lane1_sync_clk",
- host->tx_l1_sync_clk);
- if (err)
- goto disable_rx_l1;
+ /* The tx lane1 clk could be muxed, hence keep this optional */
+ if (host->tx_l1_sync_clk)
+ ufs_qcom_host_clk_enable(dev, "tx_lane1_sync_clk",
+host->tx_l1_sync_clk);
+ }
host->is_lane_clks_enabled = true;
goto out;
-disable_rx_l1:
- clk_disable_unprepare(host->rx_l1_sync_clk);
disable_tx_l0:
clk_disable_unprepare(host->tx_l0_sync_clk);
disable_rx_l0:
@@ -134,21 +133,34 @@ static int ufs_qcom_init_lane_clks(struct ufs_qcom_host
*host)
err = ufs_qcom_host_clk_get(dev,
"rx_lane0_sync_clk", &host->rx_l0_sync_clk);
- if (err)
+ if (err) {
+ dev_err(dev, "%s: failed to get rx_lane0_sync_clk, err %d",
+ __func__, err);
goto out;
+ }
err = ufs_qcom_host_clk_get(dev,
"tx_lane0_sync_clk", &host->tx_l0_sync_clk);
- if (err)
+ if (err) {
+ dev_err(dev, "%s: failed to get tx_lane0_sync_clk, err %d",
+ __func__, err);
goto out;
+ }
- err = ufs_qcom_host_clk_get(dev, "rx_lane1_sync_clk",
- &host->rx_l1_sync_clk);
- if (err)
- goto out;
+ /* In case of single lane per direction, don't read lane1 clocks */
+ if (host->hba->lanes_per_direction > 1) {
+ err = ufs_qcom_host_clk_get(dev, "rx_lane1_sync_clk",
+ &host->rx_l1_sync_clk);
+ if (err) {
+ dev_err(dev, "%s: failed to get rx_lane1_sync_clk, err
%d",
+ __func__, err);
+ goto out;
+
