usb: chipidea: need to mask INT_STATUS when write otgsc

For otgsc, both enable bits and status bits are in it. So we need
to make sure the status bits are not be cleared when write enable
bits. It can fix one bug that we plug in/out Micro AB cable fast,
and sometimes, the IDIS will be cleared wrongly when handle last
ID interrupt (ID 0->1), so the current interrupt will not occur.

For stable tree: 3.12+

Cc: stable@vger.kernel.org
Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/chipidea/otg.h b/drivers/usb/chipidea/otg.h
index 2d9f090733bc1b96ca8b7a731cc8ff89b576a17d..449bee07f4fe00a9e9f4f0e2f8b297f1d1518090 100644 (file)
--- a/drivers/usb/chipidea/otg.h
+++ b/drivers/usb/chipidea/otg.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013 Freescale Semiconductor, Inc.
+ * Copyright (C) 2013-2014 Freescale Semiconductor, Inc.
  *
  * Author: Peter Chen
  *
@@ -19,12 +19,12 @@ static inline void ci_clear_otg_interrupt(struct ci_hdrc *ci, u32 bits)
 
 static inline void ci_enable_otg_interrupt(struct ci_hdrc *ci, u32 bits)
 {
-       hw_write(ci, OP_OTGSC, bits, bits);
+       hw_write(ci, OP_OTGSC, bits | OTGSC_INT_STATUS_BITS, bits);
 }
 
 static inline void ci_disable_otg_interrupt(struct ci_hdrc *ci, u32 bits)
 {
-       hw_write(ci, OP_OTGSC, bits, 0);
+       hw_write(ci, OP_OTGSC, bits | OTGSC_INT_STATUS_BITS, 0);
 }
 
 int ci_hdrc_otg_init(struct ci_hdrc *ci);