usb: chipidea: add proper delay for waiting correct PHY status
After the PHY has powered and initialized, it needs some delay
for controller to reflect PHY's status. Some status and values
for id, vbus, dp/dm are only stable after this delay. The current
code tries to clear id/vbus status without enough delay, it
causes the status are not cleared properly.
This patch add 2ms delay after phy has initialized, and clear the
unexpected status after that.
Signed-off-by: Peter Chen <peter.chen@freescale.com>
Tested-by: Li Jun <b47624@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
index ff38cf3..d506f34 100644
--- a/drivers/usb/chipidea/core.c
+++ b/drivers/usb/chipidea/core.c
@@ -199,11 +199,10 @@
hw_write(ci, reg, PORTSC_PHCD(ci->hw_bank.lpm),
0);
/*
- * The controller needs at least 1ms to reflect
- * PHY's status, the PHY also needs some time (less
+ * the PHY needs some time (less
* than 1ms) to leave low power mode.
*/
- usleep_range(1500, 2000);
+ usleep_range(1000, 1100);
}
}
@@ -555,12 +554,8 @@
ci->is_otg = (hw_read(ci, CAP_DCCPARAMS,
DCCPARAMS_DC | DCCPARAMS_HC)
== (DCCPARAMS_DC | DCCPARAMS_HC));
- if (ci->is_otg) {
+ if (ci->is_otg)
dev_dbg(ci->dev, "It is OTG capable controller\n");
- /* Disable and clear all OTG irq */
- hw_write_otgsc(ci, OTGSC_INT_EN_BITS | OTGSC_INT_STATUS_BITS,
- OTGSC_INT_STATUS_BITS);
- }
}
static int ci_hdrc_probe(struct platform_device *pdev)
@@ -622,6 +617,13 @@
if (ret) {
dev_err(dev, "unable to init phy: %d\n", ret);
return ret;
+ } else {
+ /*
+ * The delay to sync PHY's status, the maximum delay is
+ * 2ms since the otgsc uses 1ms timer to debounce the
+ * PHY's input
+ */
+ usleep_range(2000, 2500);
}
ci->hw_bank.phys = res->start;
@@ -656,6 +658,9 @@
}
if (ci->is_otg) {
+ /* Disable and clear all OTG irq */
+ hw_write_otgsc(ci, OTGSC_INT_EN_BITS | OTGSC_INT_STATUS_BITS,
+ OTGSC_INT_STATUS_BITS);
ret = ci_hdrc_otg_init(ci);
if (ret) {
dev_err(dev, "init otg fails, ret = %d\n", ret);
@@ -665,11 +670,6 @@
if (ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET]) {
if (ci->is_otg) {
- /*
- * ID pin needs 1ms debouce time,
- * we delay 2ms for safe.
- */
- mdelay(2);
ci->role = ci_otg_role(ci);
/* Enable ID change irq */
hw_write_otgsc(ci, OTGSC_IDIE, OTGSC_IDIE);