usb: ehci: Avoid phy lockup due to SOFs during port reset
There could be race condition between h/w initiating sof
(start of frames) and finishing port reset. This can
cause hsic phy lockup, which results in enumeration failure.
Avoid this race condition by:
1. Moving to the old enumeration sequence where set_address is
initiated before get_device descriptor. This results in one
port reset instead of two port resets.
2. Halt usb controller before initiating port reset and start it after
port reset is complete. This is tricky because PORT_RESET bit
automatically clears when h/w completes the reset and failure to
start the controller within 3ms causes the peripheral device to
suspend resulting in enumeration failure. Hence, after setting
port reset bit forcefully drive strobe/data lines to reset using
ulpi interface and once port reset is complete, disable forceful
reset and start the controller in atomic context.
CRs-fixed: 364458, 359930
Change-Id: I49a2eac8043eb3001956c7ee9ead2c3a901524db
Signed-off-by: Vamsi Krishna <vskrishn@codeaurora.org>
diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h
index 6afb70b..5754170 100644
--- a/drivers/usb/host/ehci.h
+++ b/drivers/usb/host/ehci.h
@@ -152,6 +152,7 @@
unsigned has_synopsys_hc_bug:1; /* Synopsys HC */
unsigned frame_index_bug:1; /* MosChip (AKA NetMos) */
unsigned susp_sof_bug:1; /*Chip Idea HC*/
+ unsigned reset_sof_bug:1; /*Chip Idea HC*/
/* required for usb32 quirk */
#define OHCI_CTRL_HCFS (3 << 6)