The phy needs some delay to output the stable status from low
power mode. And for OTGSC, the status inputs are debounced
using a 1 ms time constant, so, delay 2ms for controller to get
the stable status(like vbus and id) when the phy leaves low power.
Signed-off-by: Peter Chen <peter.chen@xxxxxxxxxxxxx>
---
drivers/usb/chipidea/core.c | 17 ++++++++++++++++-
1 file changed, 16 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
index 69003d0..6cbfeb5 100644
--- a/drivers/usb/chipidea/core.c
+++ b/drivers/usb/chipidea/core.c
@@ -189,6 +189,17 @@ u8 hw_port_test_get(struct ci_hdrc *ci)
return hw_read(ci, OP_PORTSC, PORTSC_PTC) >> __ffs(PORTSC_PTC);
}
+static void hw_wait_phy_stable(void)
+{
+ /*
+ * The phy needs some delay to output the stable status from low
+ * power mode. And for OTGSC, the status inputs are debounced
+ * using a 1 ms time constant, so, delay 2ms for controller to get
+ * the stable status, like vbus and id when the phy leaves low power.
+ */
+ usleep_range(2000, 2500);
+}
+
/* The PHY enters/leaves low power mode */
static void ci_hdrc_enter_lpm(struct ci_hdrc *ci, bool enable)
{
@@ -307,7 +318,9 @@ static int ci_usb_phy_init(struct ci_hdrc *ci)
case USBPHY_INTERFACE_MODE_UTMIW:
case USBPHY_INTERFACE_MODE_HSIC:
ret = usb_phy_init(ci->transceiver);
- if (ret)
+ if (!ret)
+ hw_wait_phy_stable();
+ else
return ret;
hw_phymode_configure(ci);
break;
@@ -320,6 +333,8 @@ static int ci_usb_phy_init(struct ci_hdrc *ci)
break;
default:
ret = usb_phy_init(ci->transceiver);
+ if (!ret)
+ hw_wait_phy_stable();
}
return ret;
--
1.7.9.5
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