usb: chipidea: add freescale imx28 special write register method
According to Freescale imx28 Errata, "ENGR119653 USB: ARM to USB
register error issue", All USB register write operations must
use the ARM SWP instruction. So, we implement special hw_write
and hw_test_and_clear for imx28.
Discussion for it at below:
http://marc.info/?l=linux-usb&m=137996395529294&w=2
This patch is needed for stable tree 3.11+.
Cc: stable@vger.kernel.org
Cc: robert.hodaszi@digi.com
Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Tested-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
index 458d8e4..0ead0b4 100644
--- a/drivers/usb/chipidea/core.c
+++ b/drivers/usb/chipidea/core.c
@@ -548,6 +548,8 @@
ci->dev = dev;
ci->platdata = dev->platform_data;
+ ci->imx28_write_fix = !!(ci->platdata->flags &
+ CI_HDRC_IMX28_WRITE_FIX);
ret = hw_device_init(ci, base);
if (ret < 0) {