[PATCH v3 1/3] usb: chipidea: udc: handle USB Error Interrupt if IOC not set

Xu Yang
2024-09-26T02:28:10Z

As per USBSTS register description about UEI:

When completion of a USB transaction results in an error condition, this
bit is set by the Host/Device Controller. This bit is set along with the
USBINT bit, if the TD on which the error interrupt occurred also had its
interrupt on complete (IOC) bit set.

UI is set only when IOC set. Add checking UEI to fix miss call
isr_tr_complete_handler() when IOC have not set and transfer error happen.

Acked-by: Peter Chen <peter.chen@kernel.com>
Signed-off-by: Xu Yang <xu.yang_2@nxp.com>

---
Changes in v2:
- modify part commit message
- add Ack-by tag
- add fix tag and cc stable
Changes in v3:
- remove fixes tag and stable maillist
---
drivers/usb/chipidea/udc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
index 69ef3cd8d4f8..b9ccf62e0a50 100644
--- a/drivers/usb/chipidea/udc.c
+++ b/drivers/usb/chipidea/udc.c
@@ -2063,7 +2063,7 @@ static irqreturn_t udc_irq(struct ci_hdrc *ci)
}
}

- if (USBi_UI & intr)
+ if ((USBi_UI | USBi_UEI) & intr)
isr_tr_complete_handler(ci);

if ((USBi_SLI & intr) && !(ci->suspended)) {
--
2.34.1