usb: musb: cppi41: Workaround fix for Tx fifo flush during disconnect

Unable to flush musb Tx endpoint fifo during disconnect while i/o
in progress. The workaround is to set only fifoflush bit and clear
other bits in tx-csr register.

Signed-off-by: Ravi B <ravibabu@ti.com>
Signed-off-by: Vaibhav Hiremath <hvaibhav@ti.com>

diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c
index 5b1f74214623ac3f467090418c54f1235eb21338..509f7385c919a89e6d0c02f08b7f84cd8fa0fe0a 100644 (file)
--- a/drivers/usb/musb/musb_host.c
+++ b/drivers/usb/musb/musb_host.c
@@ -141,9 +141,11 @@ static void musb_h_tx_flush_fifo(struct musb_hw_ep *ep)
                if (csr != lastcsr)
                        dev_dbg(musb->controller, "Host TX FIFONOTEMPTY csr: %02x\n", csr);
                lastcsr = csr;
-               csr |= MUSB_TXCSR_FLUSHFIFO;
+               csr = MUSB_TXCSR_FLUSHFIFO;
                musb_writew(epio, MUSB_TXCSR, csr);
                csr = musb_readw(epio, MUSB_TXCSR);
+               if (!(csr & MUSB_TXCSR_FIFONOTEMPTY))
+                       break;
                if (retries-- < 1) {
                        dev_dbg(musb->controller, "Could not flush host TX%d fifo: csr: %04x\n",
                                ep->epnum, csr);