The MUSB test mode register can only be set once, otherwise the result
is undefined.
This prevents the debugfs testmode entry to set the register more than
once which causes test failure.
Signed-off-by: Bin Liu <b-liu@xxxxxx>
---
drivers/usb/musb/musb_debugfs.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/usb/musb/musb_debugfs.c b/drivers/usb/musb/musb_debugfs.c
index 179d885..7119639 100644
--- a/drivers/usb/musb/musb_debugfs.c
+++ b/drivers/usb/musb/musb_debugfs.c
@@ -189,6 +189,12 @@ static ssize_t musb_test_mode_write(struct file *file,
u8 test = 0;
char buf[18];
+ test = musb_readb(musb->mregs, MUSB_TESTMODE);
+ if (test) {
+ dev_err(musb->controller, "Error: test mode is running\n");
+ return -EINVAL;
+ }
+
memset(buf, 0x00, sizeof(buf));
if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
--
1.8.4
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