usb: chipidea: add wait vbus lower than OTGSC_BSV before role starts
When the gadget role starts, we need to make sure the vbus is lower
than OTGSC_BSV, or there will be an vbus interrupt since we use
B_SESSION_VALID as vbus interrupt to indicate connect and disconnect.
When the host role starts, it may not be useful to wait vbus to lower
than OTGSC_BSV, but it can indicate some hardware problems like the
vbus is still higher than OTGSC_BSV after we disconnect to host some
time later (5000 milliseconds currently), which is obvious not correct.
Tested-by: Marek Vasut <marex@denx.de>
Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.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 c95e098..9462640 100644
--- a/drivers/usb/chipidea/core.c
+++ b/drivers/usb/chipidea/core.c
@@ -294,6 +294,38 @@
return 0;
}
+/**
+ * hw_wait_reg: wait the register value
+ *
+ * Sometimes, it needs to wait register value before going on.
+ * Eg, when switch to device mode, the vbus value should be lower
+ * than OTGSC_BSV before connects to host.
+ *
+ * @ci: the controller
+ * @reg: register index
+ * @mask: mast bit
+ * @value: the bit value to wait
+ * @timeout_ms: timeout in millisecond
+ *
+ * This function returns an error code if timeout
+ */
+int hw_wait_reg(struct ci_hdrc *ci, enum ci_hw_regs reg, u32 mask,
+ u32 value, unsigned int timeout_ms)
+{
+ unsigned long elapse = jiffies + msecs_to_jiffies(timeout_ms);
+
+ while (hw_read(ci, reg, mask) != value) {
+ if (time_after(jiffies, elapse)) {
+ dev_err(ci->dev, "timeout waiting for %08x in %d\n",
+ mask, reg);
+ return -ETIMEDOUT;
+ }
+ msleep(20);
+ }
+
+ return 0;
+}
+
static irqreturn_t ci_irq(int irq, void *data)
{
struct ci_hdrc *ci = data;