[MMC] MMCI: Ensure that we read all data from FIFO.

When we are nearing the end of a transfer from the card, we may not
have sufficient data in the FIFO to trigger a "half FIFO full" IRQ.
Therefore, when we have less than MCI_FIFOSIZE bytes left, switch to
"FIFO contains data" IRQ mode instead.

drivers/mmc/mmci.c

@@ -249,6 +249,13 @@ static int mmci_pio_read(struct mmci_host *host, struct request *req, u32 status
 		status = readl(base + MMCISTATUS);
 	} while (1);
 
+	/*
+	 * If we're nearing the end of the read, switch to
+	 * "any data available" mode.
+	 */
+	if (host->size < MCI_FIFOSIZE)
+		writel(MCI_RXDATAAVLBLMASK, base + MMCIMASK1);
+
 	return ret;
 }