[PATCH v1 7/8] phy: qcom-qmp: Move UFS phy to phy_poweron/off

Evan Green
2019-01-11T23:02:21Z

For UFS, move the actual firing up of the PHY to phy_poweron and
phy_poweroff callbacks, rather than init/exit. UFS calls
phy_poweroff during suspend, so now all clocks and regulators for
the phy can be powered down during suspend.

Signed-off-by: Evan Green <evgreen@chromium.org>

---

drivers/phy/qualcomm/phy-qcom-qmp.c | 82 ++++++++---------------------
1 file changed, 23 insertions(+), 59 deletions(-)

diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.c b/drivers/phy/qualcomm/phy-qcom-qmp.c
index eb1cac8f0fd4e..7766c6384d0a8 100644
--- a/drivers/phy/qualcomm/phy-qcom-qmp.c
+++ b/drivers/phy/qualcomm/phy-qcom-qmp.c
@@ -1209,8 +1209,7 @@ static int qcom_qmp_phy_com_exit(struct qcom_qmp *qmp)
return 0;
}

-/* PHY Initialization */
-static int qcom_qmp_phy_init(struct phy *phy)
+static int qcom_qmp_phy_enable(struct phy *phy)
{
struct qmp_phy *qphy = phy_get_drvdata(phy);
struct qcom_qmp *qmp = qphy->qmp;
@@ -1224,7 +1223,6 @@ static int qcom_qmp_phy_init(struct phy *phy)
int ret;

dev_vdbg(qmp->dev, "Initializing QMP phy\n");
-
if (cfg->has_ufsphy_reset) {
/*
* Get UFS reset, which is delayed until now to avoid a
@@ -1292,14 +1290,6 @@ static int qcom_qmp_phy_init(struct phy *phy)
}
}

- /*
- * UFS PHY requires the deassert of software reset before serdes start.
- * For UFS PHYs that do not have software reset control bits, defer
- * starting serdes until the power on callback.
- */
- if ((cfg->type == PHY_TYPE_UFS) && cfg->no_pcs_sw_reset)
- goto out;
-
/*
* Pull out PHY from POWER DOWN state.
* This is active low enable signal to power-down PHY.
@@ -1311,7 +1301,9 @@ static int qcom_qmp_phy_init(struct phy *phy)
usleep_range(cfg->pwrdn_delay_min, cfg->pwrdn_delay_max);

/* Pull PHY out of reset state */
- qphy_clrbits(pcs, cfg->regs[QPHY_SW_RESET], SW_RESET);
+ if (!cfg->no_pcs_sw_reset)
+ qphy_clrbits(pcs, cfg->regs[QPHY_SW_RESET], SW_RESET);
+
if (cfg->has_phy_dp_com_ctrl)
qphy_clrbits(dp_com, QPHY_V3_DP_COM_SW_RESET, SW_RESET);

@@ -1328,11 +1320,12 @@ static int qcom_qmp_phy_init(struct phy *phy)
goto err_pcs_ready;
}
qmp->phy_initialized = true;
-
-out:
- return ret;
+ return 0;

err_pcs_ready:
+ if (qmp->ufs_reset)
+ reset_control_assert(qmp->ufs_reset);
+
clk_disable_unprepare(qphy->pipe_clk);
err_clk_enable:
if (cfg->has_lane_rst)
@@ -1343,7 +1336,7 @@ static int qcom_qmp_phy_init(struct phy *phy)
return ret;
}

-static int qcom_qmp_phy_exit(struct phy *phy)
+static int qcom_qmp_phy_disable(struct phy *phy)
{
struct qmp_phy *qphy = phy_get_drvdata(phy);
struct qcom_qmp *qmp = qphy->qmp;
@@ -1360,7 +1353,6 @@ static int qcom_qmp_phy_exit(struct phy *phy)

/* Put PHY into POWER DOWN state: active low */
qphy_clrbits(qphy->pcs, QPHY_POWER_DOWN_CONTROL, cfg->pwrdn_ctrl);
-
if (cfg->has_lane_rst)
reset_control_assert(qphy->lane_rst);

@@ -1371,44 +1363,6 @@ static int qcom_qmp_phy_exit(struct phy *phy)
return 0;
}

-static int qcom_qmp_phy_poweron(struct phy *phy)
-{
- struct qmp_phy *qphy = phy_get_drvdata(phy);
- struct qcom_qmp *qmp = qphy->qmp;
- const struct qmp_phy_cfg *cfg = qmp->cfg;
- void __iomem *pcs = qphy->pcs;
- void __iomem *status;
- unsigned int mask, val;
- int ret = 0;
-
- if (cfg->type != PHY_TYPE_UFS)
- return 0;
-
- /*
- * For UFS PHY that has not software reset control, serdes start
- * should only happen when UFS driver explicitly calls phy_power_on
- * after it deasserts software reset.
- */
- if (cfg->no_pcs_sw_reset && !qmp->phy_initialized &&
- (qmp->init_count != 0)) {
- /* start SerDes and Phy-Coding-Sublayer */
- qphy_setbits(pcs, cfg->regs[QPHY_START_CTRL], cfg->start_ctrl);
-
- status = pcs + cfg->regs[QPHY_PCS_READY_STATUS];
- mask = cfg->mask_pcs_ready;
-
- ret = readl_poll_timeout(status, val, !(val & mask), 1,
- PHY_INIT_COMPLETE_TIMEOUT);
- if (ret) {
- dev_err(qmp->dev, "phy initialization timed-out\n");
- return ret;
- }
- qmp->phy_initialized = true;
- }
-
- return ret;
-}
-
static int qcom_qmp_phy_set_mode(struct phy *phy,
enum phy_mode mode, int submode)
{
@@ -1658,9 +1612,15 @@ static int phy_pipe_clk_register(struct qcom_qmp *qmp, struct device_node *np)
}

static const struct phy_ops qcom_qmp_phy_gen_ops = {
- .init = qcom_qmp_phy_init,
- .exit = qcom_qmp_phy_exit,
- .power_on = qcom_qmp_phy_poweron,
+ .init = qcom_qmp_phy_enable,
+ .exit = qcom_qmp_phy_disable,
+ .set_mode = qcom_qmp_phy_set_mode,
+ .owner = THIS_MODULE,
+};
+
+static const struct phy_ops qcom_qmp_ufs_ops = {
+ .power_on = qcom_qmp_phy_enable,
+ .power_off = qcom_qmp_phy_disable,
.set_mode = qcom_qmp_phy_set_mode,
.owner = THIS_MODULE,
};
@@ -1671,6 +1631,7 @@ int qcom_qmp_phy_create(struct device *dev, struct device_node *np, int id)
struct qcom_qmp *qmp = dev_get_drvdata(dev);
struct phy *generic_phy;
struct qmp_phy *qphy;
+ const struct phy_ops *ops = &qcom_qmp_phy_gen_ops;
char prop_name[MAX_PROP_NAME];
int ret;

@@ -1757,7 +1718,10 @@ int qcom_qmp_phy_create(struct device *dev, struct device_node *np, int id)
}
}

- generic_phy = devm_phy_create(dev, np, &qcom_qmp_phy_gen_ops);
+ if (qmp->cfg->type == PHY_TYPE_UFS)
+ ops = &qcom_qmp_ufs_ops;
+
+ generic_phy = devm_phy_create(dev, np, ops);
if (IS_ERR(generic_phy)) {
ret = PTR_ERR(generic_phy);
dev_err(dev, "failed to create qphy %d\n", ret);
--
2.18.1