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Subject[v4 01/14] scsi: ufs-qcom: add number of lanes per direction
Date
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 <gbroner@codeaurora.org>
Signed-off-by: Yaniv Gardi <ygardi@codeaurora.org>

---
.../devicetree/bindings/ufs/ufshcd-pltfrm.txt | 3 ++
drivers/scsi/ufs/ufs-qcom.c | 39 ++++++++++++----------
drivers/scsi/ufs/ufshcd-pltfrm.c | 19 +++++++++++
drivers/scsi/ufs/ufshcd.c | 1 +
drivers/scsi/ufs/ufshcd.h | 2 ++
5 files changed, 47 insertions(+), 17 deletions(-)

diff --git a/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt b/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt
index 03c0e98..66f6adf 100644
--- a/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt
+++ b/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt
@@ -38,6 +38,9 @@ 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 4f38d00..ed57729 100644
--- a/drivers/scsi/ufs/ufs-qcom.c
+++ b/drivers/scsi/ufs/ufs-qcom.c
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2013-2015, Linux Foundation. All rights reserved.
+ * Copyright (c) 2013-2016, Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
@@ -132,21 +132,24 @@ 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;
+ 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 +173,16 @@ 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-pltfrm.c b/drivers/scsi/ufs/ufshcd-pltfrm.c
index d2a7b12..718f12e 100644
--- a/drivers/scsi/ufs/ufshcd-pltfrm.c
+++ b/drivers/scsi/ufs/ufshcd-pltfrm.c
@@ -40,6 +40,8 @@
#include "ufshcd.h"
#include "ufshcd-pltfrm.h"

+#define UFSHCD_DEFAULT_LANES_PER_DIRECTION 2
+
static int ufshcd_parse_clock_info(struct ufs_hba *hba)
{
int ret = 0;
@@ -277,6 +279,21 @@ void ufshcd_pltfrm_shutdown(struct platform_device *pdev)
}
EXPORT_SYMBOL_GPL(ufshcd_pltfrm_shutdown);

+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_pltfrm_init - probe routine of the driver
* @pdev: pointer to Platform device handle
@@ -331,6 +348,8 @@ int ufshcd_pltfrm_init(struct platform_device *pdev,
pm_runtime_set_active(&pdev->dev);
pm_runtime_enable(&pdev->dev);

+ ufshcd_init_lanes_per_dir(hba);
+
err = ufshcd_init(hba, mmio_base, irq);
if (err) {
dev_err(dev, "Initialization failed\n");
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 7ab6a45..65593b3 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"

diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index 8e22e6c..2e5bbce 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
--
QUALCOMM ISRAEL, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation

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