usb: musb: tusb6010: Handle DMA TX completion in DMA callback as well

Handle the DMA TX in a similar way as we do for the RX: in the DMA
completion callback.

Since we are no longer using DMA completion interrupt for the TX we can as
wall keep these interrupts disabled, but keep the handler for debug
purposes.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Tested-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Bin Liu <b-liu@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/musb/tusb6010.c

@@ -881,26 +881,14 @@ static irqreturn_t tusb_musb_interrupt(int irq, void *__hci)
 				| TUSB_INT_SRC_ID_STATUS_CHNG))
 		idle_timeout = tusb_otg_ints(musb, int_src, tbase);
 
-	/* TX dma callback must be handled here, RX dma callback is
-	 * handled in tusb_omap_dma_cb.
+	/*
+	 * Just clear the DMA interrupt if it comes as the completion for both
+	 * TX and RX is handled by the DMA callback in tusb6010_omap
 	 */
 	if ((int_src & TUSB_INT_SRC_TXRX_DMA_DONE)) {
 		u32	dma_src = musb_readl(tbase, TUSB_DMA_INT_SRC);
-		u32	real_dma_src = musb_readl(tbase, TUSB_DMA_INT_MASK);
 
 		dev_dbg(musb->controller, "DMA IRQ %08x\n", dma_src);
-		real_dma_src = ~real_dma_src & dma_src;
-		if (tusb_dma_omap(musb) && real_dma_src) {
-			int	tx_source = (real_dma_src & 0xffff);
-			int	i;
-
-			for (i = 1; i <= 15; i++) {
-				if (tx_source & (1 << i)) {
-					dev_dbg(musb->controller, "completing ep%i %s\n", i, "tx");
-					musb_dma_completion(musb, i, 1);
-				}
-			}
-		}
 		musb_writel(tbase, TUSB_DMA_INT_CLEAR, dma_src);
 	}