phy: qcom-qmp-usb: drop power-down delay config

The power-down delay was included in the first version of the QMP driver
as an optional delay after powering on the PHY (using
POWER_DOWN_CONTROL) and just before starting it. Later changes modified
this sequence by powering on before initialising the PHY, but the
optional delay stayed where it was (i.e. before starting the PHY).

The vendor driver does not use a delay before starting the PHY and this
is likely not needed on any platform unless there is a corresponding
delay in the vendor kernel init sequence tables (i.e. in devicetree).

Let's keep the delay for now, but drop the redundant delay period
configuration while increasing the unnecessarily low timer slack
somewhat.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Link: https://lore.kernel.org/r/20221012081241.18273-15-johan+linaro@kernel.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>

diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-usb.c b/drivers/phy/qualcomm/phy-qcom-qmp-usb.c
index 57dda1ecefe69afaa229e03b2fc1bf982c69971b..751f628710eb58f1a2a143fd9755f3297ecc76a8 100644 (file)
--- a/drivers/phy/qualcomm/phy-qcom-qmp-usb.c
+++ b/drivers/phy/qualcomm/phy-qcom-qmp-usb.c
@@ -63,8 +63,6 @@
 #define CLAMP_EN                               BIT(0) /* enables i/o clamp_n */
 
 #define PHY_INIT_COMPLETE_TIMEOUT              10000
-#define POWER_DOWN_DELAY_US_MIN                        10
-#define POWER_DOWN_DELAY_US_MAX                        11
 
 struct qmp_phy_init_tbl {
        unsigned int offset;
@@ -1452,9 +1450,6 @@ struct qmp_phy_cfg {
 
        /* true, if PHY needs delay after POWER_DOWN */
        bool has_pwrdn_delay;
-       /* power_down delay in usec */
-       int pwrdn_delay_min;
-       int pwrdn_delay_max;
 
        /* true, if PHY has a separate DP_COM control block */
        bool has_phy_dp_com_ctrl;
@@ -1660,9 +1655,6 @@ static const struct qmp_phy_cfg qmp_v3_usb3phy_cfg = {
        .phy_status             = PHYSTATUS,
 
        .has_pwrdn_delay        = true,
-       .pwrdn_delay_min        = POWER_DOWN_DELAY_US_MIN,
-       .pwrdn_delay_max        = POWER_DOWN_DELAY_US_MAX,
-
        .has_phy_dp_com_ctrl    = true,
 };
 
@@ -1690,9 +1682,6 @@ static const struct qmp_phy_cfg sc7180_usb3phy_cfg = {
        .phy_status             = PHYSTATUS,
 
        .has_pwrdn_delay        = true,
-       .pwrdn_delay_min        = POWER_DOWN_DELAY_US_MIN,
-       .pwrdn_delay_max        = POWER_DOWN_DELAY_US_MAX,
-
        .has_phy_dp_com_ctrl    = true,
 };
 
@@ -1744,8 +1733,6 @@ static const struct qmp_phy_cfg qmp_v3_usb3_uniphy_cfg = {
        .phy_status             = PHYSTATUS,
 
        .has_pwrdn_delay        = true,
-       .pwrdn_delay_min        = POWER_DOWN_DELAY_US_MIN,
-       .pwrdn_delay_max        = POWER_DOWN_DELAY_US_MAX,
 };
 
 static const struct qmp_phy_cfg msm8998_usb3phy_cfg = {
@@ -1798,11 +1785,7 @@ static const struct qmp_phy_cfg sm8150_usb3phy_cfg = {
        .pwrdn_ctrl             = SW_PWRDN,
        .phy_status             = PHYSTATUS,
 
-
        .has_pwrdn_delay        = true,
-       .pwrdn_delay_min        = POWER_DOWN_DELAY_US_MIN,
-       .pwrdn_delay_max        = POWER_DOWN_DELAY_US_MAX,
-
        .has_phy_dp_com_ctrl    = true,
 };
 
@@ -1833,8 +1816,6 @@ static const struct qmp_phy_cfg sm8150_usb3_uniphy_cfg = {
        .phy_status             = PHYSTATUS,
 
        .has_pwrdn_delay        = true,
-       .pwrdn_delay_min        = POWER_DOWN_DELAY_US_MIN,
-       .pwrdn_delay_max        = POWER_DOWN_DELAY_US_MAX,
 };
 
 static const struct qmp_phy_cfg sm8250_usb3phy_cfg = {
@@ -1864,9 +1845,6 @@ static const struct qmp_phy_cfg sm8250_usb3phy_cfg = {
        .phy_status             = PHYSTATUS,
 
        .has_pwrdn_delay        = true,
-       .pwrdn_delay_min        = POWER_DOWN_DELAY_US_MIN,
-       .pwrdn_delay_max        = POWER_DOWN_DELAY_US_MAX,
-
        .has_phy_dp_com_ctrl    = true,
 };
 
@@ -1897,8 +1875,6 @@ static const struct qmp_phy_cfg sm8250_usb3_uniphy_cfg = {
        .phy_status             = PHYSTATUS,
 
        .has_pwrdn_delay        = true,
-       .pwrdn_delay_min        = POWER_DOWN_DELAY_US_MIN,
-       .pwrdn_delay_max        = POWER_DOWN_DELAY_US_MAX,
 };
 
 static const struct qmp_phy_cfg sdx55_usb3_uniphy_cfg = {
@@ -1928,8 +1904,6 @@ static const struct qmp_phy_cfg sdx55_usb3_uniphy_cfg = {
        .phy_status             = PHYSTATUS,
 
        .has_pwrdn_delay        = true,
-       .pwrdn_delay_min        = POWER_DOWN_DELAY_US_MIN,
-       .pwrdn_delay_max        = POWER_DOWN_DELAY_US_MAX,
 };
 
 static const struct qmp_phy_cfg sdx65_usb3_uniphy_cfg = {
@@ -1959,8 +1933,6 @@ static const struct qmp_phy_cfg sdx65_usb3_uniphy_cfg = {
        .phy_status             = PHYSTATUS,
 
        .has_pwrdn_delay        = true,
-       .pwrdn_delay_min        = POWER_DOWN_DELAY_US_MIN,
-       .pwrdn_delay_max        = POWER_DOWN_DELAY_US_MAX,
 };
 
 static const struct qmp_phy_cfg sm8350_usb3phy_cfg = {
@@ -1990,9 +1962,6 @@ static const struct qmp_phy_cfg sm8350_usb3phy_cfg = {
        .phy_status             = PHYSTATUS,
 
        .has_pwrdn_delay        = true,
-       .pwrdn_delay_min        = POWER_DOWN_DELAY_US_MIN,
-       .pwrdn_delay_max        = POWER_DOWN_DELAY_US_MAX,
-
        .has_phy_dp_com_ctrl    = true,
 };
 
@@ -2023,8 +1992,6 @@ static const struct qmp_phy_cfg sm8350_usb3_uniphy_cfg = {
        .phy_status             = PHYSTATUS,
 
        .has_pwrdn_delay        = true,
-       .pwrdn_delay_min        = POWER_DOWN_DELAY_US_MIN,
-       .pwrdn_delay_max        = POWER_DOWN_DELAY_US_MAX,
 };
 
 static const struct qmp_phy_cfg qcm2290_usb3phy_cfg = {
@@ -2205,7 +2172,7 @@ static int qmp_usb_power_on(struct phy *phy)
        qmp_usb_configure(pcs, cfg->pcs_tbl, cfg->pcs_tbl_num);
 
        if (cfg->has_pwrdn_delay)
-               usleep_range(cfg->pwrdn_delay_min, cfg->pwrdn_delay_max);
+               usleep_range(10, 20);
 
        /* Pull PHY out of reset state */
        qphy_clrbits(pcs, cfg->regs[QPHY_SW_RESET], SW_RESET);