summaryrefslogtreecommitdiffstats
path: root/drivers/phy
diff options
context:
space:
mode:
authorEvan Green <evgreen@chromium.org>2019-03-21 10:17:59 -0700
committerKishon Vijay Abraham I <kishon@ti.com>2019-04-17 14:12:56 +0530
commitc9b589791fc1b37fdca35b621dae62e98e4c95fc (patch)
tree6049f17f5e3586f311376670fd2ff5287e9a0828 /drivers/phy
parent12fd5f250db2ad6b292d3a28bc3c0011fe30511f (diff)
downloadlinux-c9b589791fc1b37fdca35b621dae62e98e4c95fc.tar.bz2
phy: qcom: Utilize UFS reset controller
Move the PHY reset from ufs-qcom into the respective PHYs. This will allow us to merge the two phases of UFS PHY initialization. Signed-off-by: Evan Green <evgreen@chromium.org> Reviewed-by: Stephen Boyd <swboyd@chromium.org> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Diffstat (limited to 'drivers/phy')
-rw-r--r--drivers/phy/qualcomm/phy-qcom-qmp.c34
-rw-r--r--drivers/phy/qualcomm/phy-qcom-ufs-i.h3
-rw-r--r--drivers/phy/qualcomm/phy-qcom-ufs-qmp-14nm.c8
-rw-r--r--drivers/phy/qualcomm/phy-qcom-ufs-qmp-20nm.c8
-rw-r--r--drivers/phy/qualcomm/phy-qcom-ufs.c23
5 files changed, 76 insertions, 0 deletions
diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.c b/drivers/phy/qualcomm/phy-qcom-qmp.c
index 08d6f6f7f039..a808887ab4e2 100644
--- a/drivers/phy/qualcomm/phy-qcom-qmp.c
+++ b/drivers/phy/qualcomm/phy-qcom-qmp.c
@@ -897,6 +897,7 @@ struct qmp_phy {
* @init_count: phy common block initialization count
* @phy_initialized: indicate if PHY has been initialized
* @mode: current PHY mode
+ * @ufs_reset: optional UFS PHY reset handle
*/
struct qcom_qmp {
struct device *dev;
@@ -914,6 +915,8 @@ struct qcom_qmp {
int init_count;
bool phy_initialized;
enum phy_mode mode;
+
+ struct reset_control *ufs_reset;
};
static inline void qphy_setbits(void __iomem *base, u32 offset, u32 val)
@@ -1314,6 +1317,7 @@ static int qcom_qmp_phy_com_exit(struct qcom_qmp *qmp)
return 0;
}
+ reset_control_assert(qmp->ufs_reset);
if (cfg->has_phy_com_ctrl) {
qphy_setbits(serdes, cfg->regs[QPHY_COM_START_CONTROL],
SERDES_START | PCS_START);
@@ -1351,6 +1355,33 @@ static int qcom_qmp_phy_init(struct phy *phy)
dev_vdbg(qmp->dev, "Initializing QMP phy\n");
+ if (cfg->no_pcs_sw_reset) {
+ /*
+ * Get UFS reset, which is delayed until now to avoid a
+ * circular dependency where UFS needs its PHY, but the PHY
+ * needs this UFS reset.
+ */
+ if (!qmp->ufs_reset) {
+ qmp->ufs_reset =
+ devm_reset_control_get_exclusive(qmp->dev,
+ "ufsphy");
+
+ if (IS_ERR(qmp->ufs_reset)) {
+ ret = PTR_ERR(qmp->ufs_reset);
+ dev_err(qmp->dev,
+ "failed to get UFS reset: %d\n",
+ ret);
+
+ qmp->ufs_reset = NULL;
+ return ret;
+ }
+ }
+
+ ret = reset_control_assert(qmp->ufs_reset);
+ if (ret)
+ goto err_lane_rst;
+ }
+
ret = qcom_qmp_phy_com_init(qphy);
if (ret)
return ret;
@@ -1383,6 +1414,9 @@ static int qcom_qmp_phy_init(struct phy *phy)
cfg->rx_tbl, cfg->rx_tbl_num);
qcom_qmp_phy_configure(pcs, cfg->regs, cfg->pcs_tbl, cfg->pcs_tbl_num);
+ ret = reset_control_deassert(qmp->ufs_reset);
+ if (ret)
+ goto err_lane_rst;
/*
* UFS PHY requires the deassert of software reset before serdes start.
diff --git a/drivers/phy/qualcomm/phy-qcom-ufs-i.h b/drivers/phy/qualcomm/phy-qcom-ufs-i.h
index f798fb64de94..ba77348d807c 100644
--- a/drivers/phy/qualcomm/phy-qcom-ufs-i.h
+++ b/drivers/phy/qualcomm/phy-qcom-ufs-i.h
@@ -19,6 +19,7 @@
#include <linux/clk.h>
#include <linux/phy/phy.h>
#include <linux/regulator/consumer.h>
+#include <linux/reset.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/io.h>
@@ -101,6 +102,7 @@ struct ufs_qcom_phy {
struct ufs_qcom_phy_specific_ops *phy_spec_ops;
enum phy_mode mode;
+ struct reset_control *ufs_reset;
};
/**
@@ -132,6 +134,7 @@ struct phy *ufs_qcom_phy_generic_probe(struct platform_device *pdev,
struct ufs_qcom_phy *common_cfg,
const struct phy_ops *ufs_qcom_phy_gen_ops,
struct ufs_qcom_phy_specific_ops *phy_spec_ops);
+int ufs_qcom_phy_get_reset(struct ufs_qcom_phy *phy_common);
int ufs_qcom_phy_calibrate(struct ufs_qcom_phy *ufs_qcom_phy,
struct ufs_qcom_phy_calibration *tbl_A, int tbl_size_A,
struct ufs_qcom_phy_calibration *tbl_B, int tbl_size_B,
diff --git a/drivers/phy/qualcomm/phy-qcom-ufs-qmp-14nm.c b/drivers/phy/qualcomm/phy-qcom-ufs-qmp-14nm.c
index 1e0d4f2046a4..cc343517a2ca 100644
--- a/drivers/phy/qualcomm/phy-qcom-ufs-qmp-14nm.c
+++ b/drivers/phy/qualcomm/phy-qcom-ufs-qmp-14nm.c
@@ -48,6 +48,14 @@ static int ufs_qcom_phy_qmp_14nm_init(struct phy *generic_phy)
bool is_rate_B = false;
int ret;
+ ret = ufs_qcom_phy_get_reset(phy_common);
+ if (ret)
+ return ret;
+
+ ret = reset_control_assert(phy_common->ufs_reset);
+ if (ret)
+ return ret;
+
if (phy_common->mode == PHY_MODE_UFS_HS_B)
is_rate_B = true;
diff --git a/drivers/phy/qualcomm/phy-qcom-ufs-qmp-20nm.c b/drivers/phy/qualcomm/phy-qcom-ufs-qmp-20nm.c
index aef40f7a41d4..54b2af9d8702 100644
--- a/drivers/phy/qualcomm/phy-qcom-ufs-qmp-20nm.c
+++ b/drivers/phy/qualcomm/phy-qcom-ufs-qmp-20nm.c
@@ -67,6 +67,14 @@ static int ufs_qcom_phy_qmp_20nm_init(struct phy *generic_phy)
bool is_rate_B = false;
int ret;
+ ret = ufs_qcom_phy_get_reset(phy_common);
+ if (ret)
+ return ret;
+
+ ret = reset_control_assert(phy_common->ufs_reset);
+ if (ret)
+ return ret;
+
if (phy_common->mode == PHY_MODE_UFS_HS_B)
is_rate_B = true;
diff --git a/drivers/phy/qualcomm/phy-qcom-ufs.c b/drivers/phy/qualcomm/phy-qcom-ufs.c
index f2979ccad00a..fe59785a55f2 100644
--- a/drivers/phy/qualcomm/phy-qcom-ufs.c
+++ b/drivers/phy/qualcomm/phy-qcom-ufs.c
@@ -147,6 +147,22 @@ out:
}
EXPORT_SYMBOL_GPL(ufs_qcom_phy_generic_probe);
+int ufs_qcom_phy_get_reset(struct ufs_qcom_phy *phy_common)
+{
+ struct reset_control *reset;
+
+ if (phy_common->ufs_reset)
+ return 0;
+
+ reset = devm_reset_control_get_exclusive_by_index(phy_common->dev, 0);
+ if (IS_ERR(reset))
+ return PTR_ERR(reset);
+
+ phy_common->ufs_reset = reset;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ufs_qcom_phy_get_reset);
+
static int __ufs_qcom_phy_clk_get(struct device *dev,
const char *name, struct clk **clk_out, bool err_print)
{
@@ -533,6 +549,12 @@ int ufs_qcom_phy_power_on(struct phy *generic_phy)
if (phy_common->is_powered_on)
return 0;
+ err = reset_control_deassert(phy_common->ufs_reset);
+ if (err) {
+ dev_err(dev, "Failed to assert UFS PHY reset");
+ return err;
+ }
+
if (!phy_common->is_started) {
err = ufs_qcom_phy_start_serdes(phy_common);
if (err)
@@ -620,6 +642,7 @@ int ufs_qcom_phy_power_off(struct phy *generic_phy)
ufs_qcom_phy_disable_vreg(phy_common->dev, &phy_common->vdda_pll);
ufs_qcom_phy_disable_vreg(phy_common->dev, &phy_common->vdda_phy);
+ reset_control_assert(phy_common->ufs_reset);
phy_common->is_powered_on = false;
return 0;