From c4e94174983a86c935be1537a73e496b778b0287 Mon Sep 17 00:00:00 2001 From: Li Jun Date: Tue, 16 Aug 2016 19:19:11 +0800 Subject: usb: chipidea: udc: don't touch DP when controller is in host mode When the controller is configured to be dual role and it's in host mode, if bind udc and gadgt driver, those gadget operations will do gadget disconnect and finally pull down DP line, which will break host function. Cc: # 4.1+ Signed-off-by: Li Jun Signed-off-by: Peter Chen --- drivers/usb/chipidea/udc.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) (limited to 'drivers/usb/chipidea/udc.c') diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c index 065f5d97aa67..dfec5a176315 100644 --- a/drivers/usb/chipidea/udc.c +++ b/drivers/usb/chipidea/udc.c @@ -1596,8 +1596,11 @@ static int ci_udc_pullup(struct usb_gadget *_gadget, int is_on) { struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget); - /* Data+ pullup controlled by OTG state machine in OTG fsm mode */ - if (ci_otg_is_fsm_mode(ci)) + /* + * Data+ pullup controlled by OTG state machine in OTG fsm mode; + * and don't touch Data+ in host mode for dual role config. + */ + if (ci_otg_is_fsm_mode(ci) || ci->role == CI_ROLE_HOST) return 0; pm_runtime_get_sync(&ci->gadget.dev); -- cgit v1.2.3-70-g09d2 From 6f3c4fb6d05e63c9c6d8968302491c3a5457be61 Mon Sep 17 00:00:00 2001 From: Clemens Gruber Date: Mon, 5 Sep 2016 19:29:58 +0200 Subject: usb: chipidea: udc: fix NULL ptr dereference in isr_setup_status_phase Problems with the signal integrity of the high speed USB data lines or noise on reference ground lines can cause the i.MX6 USB controller to violate USB specs and exhibit unexpected behavior. It was observed that USBi_UI interrupts were triggered first and when isr_setup_status_phase was called, ci->status was NULL, which lead to a NULL pointer dereference kernel panic. This patch fixes the kernel panic, emits a warning once and returns -EPIPE to halt the device and let the host get stalled. It also adds a comment to point people, who are experiencing this issue, to their USB hardware design. Cc: #4.1+ Signed-off-by: Clemens Gruber Signed-off-by: Peter Chen --- drivers/usb/chipidea/udc.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'drivers/usb/chipidea/udc.c') diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c index dfec5a176315..b93356834bb5 100644 --- a/drivers/usb/chipidea/udc.c +++ b/drivers/usb/chipidea/udc.c @@ -949,6 +949,15 @@ static int isr_setup_status_phase(struct ci_hdrc *ci) int retval; struct ci_hw_ep *hwep; + /* + * Unexpected USB controller behavior, caused by bad signal integrity + * or ground reference problems, can lead to isr_setup_status_phase + * being called with ci->status equal to NULL. + * If this situation occurs, you should review your USB hardware design. + */ + if (WARN_ON_ONCE(!ci->status)) + return -EPIPE; + hwep = (ci->ep0_dir == TX) ? ci->ep0out : ci->ep0in; ci->status->context = ci; ci->status->complete = isr_setup_status_complete; -- cgit v1.2.3-70-g09d2