Different platform 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.
Signed-off-by: Gilad Broner <gbro...@codeaurora.org>
Signed-off-by: Yaniv Gardi <yga...@codeaurora.org>
---
.../devicetree/bindings/ufs/ufshcd-pltfrm.txt | 3 ++
drivers/scsi/ufs/ufs-qcom.c | 38 ++++++++++++----------
drivers/scsi/ufs/ufshcd.c | 20 ++++++++++++
drivers/scsi/ufs/ufshcd.h | 2 ++
4 files changed, 46 insertions(+), 17 deletions(-)
diff --git a/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt
b/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt
index b39e765..56b105f 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 c99eac9..3196197 100644
--- a/drivers/scsi/ufs/ufs-qcom.c
+++ b/drivers/scsi/ufs/ufs-qcom.c
@@ -132,21 +132,23 @@ 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;
-
- err = ufs_qcom_host_clk_enable(dev, "tx_lane1_sync_clk",
- host->tx_l1_sync_clk);
- if (err)
- goto disable_rx_l1;
+ 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;
+ }
host->is_lane_clks_enabled = true;
goto out;
disable_rx_l1:
- clk_disable_unprepare(host->rx_l1_sync_clk);
+ if (host->hba->lanes_per_direction > 1)
+ clk_disable_unprepare(host->rx_l1_sync_clk);
disable_tx_l0:
clk_disable_unprepare(host->tx_l0_sync_clk);
disable_rx_l0:
@@ -170,14 +172,16 @@ static int ufs_qcom_init_lane_clks(struct ufs_qcom_host
*host)
if (err)
goto out;
- err = ufs_qcom_host_clk_get(dev, "rx_lane1_sync_clk",
- &host->rx_l1_sync_clk);
- if (err)
- goto out;
-
- err = ufs_qcom_host_clk_get(dev, "tx_lane1_sync_clk",
- &host->tx_l1_sync_clk);
+ /* 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)
+ goto out;
+ err = ufs_qcom_host_clk_get(dev, "tx_lane1_sync_clk",
+ &host->tx_l1_sync_clk);
+ }
out:
return err;
}
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 1c37a7d..9638553 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -40,6 +40,7 @@
#include <linux/async.h>
#include <linux/devfreq.h>
+#include <linux/of.h>
#include "ufshcd.h"
#include "unipro.h"
#define UFSHCD_REQ_SENSE_SIZE 18
@@ -87,6 +88,8 @@
/* Interrupt aggregation default timeout, unit: 40us */
#define INT_AGGR_DEF_TO 0x02
+#define UFSHCD_DEFAULT_LANES_PER_DIRECTION 2
+
#define ufshcd_toggle_vreg(_dev, _vreg, _on) \
({ \
int _ret; \
@@ -5765,6 +5768,21 @@ static struct devfreq_dev_profile ufs_devfreq_profile = {
.get_dev_status = ufshcd_devfreq_get_dev_status,
};
+static void ufshcd_init_lanes_per_dir(struct ufs_hba *hba)
+{
+ struct device *dev = hba->dev;
+ int ret;
+
+ ret = of_property_read_u32(dev->of_node, "lanes-per-direction",
+ &hba->lanes_per_direction);
+ if (ret) {
+ dev_dbg(hba->dev,
+ "%s: failed to read lanes-per-direction, ret=%d\n",
+ __func__, ret);
+ hba->lanes_per_direction = UFSHCD_DEFAULT_LANES_PER_DIRECTION;
+ }
+}
+
/**
* ufshcd_init - Driver initialization routine
* @hba: per-adapter instance
@@ -5788,6 +5806,8 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem
*mmio_base, unsigned int irq)
hba->mmio_base = mmio_base;
hba->irq = irq;
+ ufshcd_init_lanes_per_dir(hba);
+
err = ufshcd_hba_init(hba);
if (err)
goto out_error;
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index f8ce680..e7bcf65 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -509,6 +509,8 @@ struct ufs_hba {
bool wlun_dev_clr_ua;
+ /* Number of lanes available (1 or 2) for Rx/Tx */
+ u32 lanes_per_direction;
struct ufs_pa_layer_attr pwr_info;
struct ufs_pwr_mode_info max_pwr_info;
--
1.8.5.2
--
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