mmc: dw_mmc: push/pop all FIFO data if any data request

When DTO interrupt occurred, there are any remaining data still in FIFO
due to RX FIFO threshold is larger than remaining data. It also
causes that dwmmc didn't trigger RXDR interrupt, so is TX.

It's responsibility of driver to read remaining bytes on seeing DTO
interrupt.

Signed-off-by: Jacob Chen <jacob2.chen@rock-chips.com>
Signed-off-by: Ziyuan Xu <xzy.xu@rock-chips.com>

drivers/mmc/dw_mmc.c

@@ -120,9 +120,9 @@ static int dwmci_data_transfer(struct dwmci_host *host, struct mmc_data *data)
 
 		if (host->fifo_mode && size) {
 			len = 0;
-			if (data->flags == MMC_DATA_READ) {
-				if ((dwmci_readl(host, DWMCI_RINTSTS) &
-				     DWMCI_INTMSK_RXDR)) {
+			if (data->flags == MMC_DATA_READ &&
+			    (mask & DWMCI_INTMSK_RXDR)) {
+				while (size) {
 					len = dwmci_readl(host, DWMCI_STATUS);
 					len = (len >> DWMCI_FIFO_SHIFT) &
 						    DWMCI_FIFO_MASK;
@@ -130,12 +130,13 @@ static int dwmci_data_transfer(struct dwmci_host *host, struct mmc_data *data)
 					for (i = 0; i < len; i++)
 						*buf++ =
 						dwmci_readl(host, DWMCI_DATA);
-					dwmci_writel(host, DWMCI_RINTSTS,
-						     DWMCI_INTMSK_RXDR);
+					size = size > len ? (size - len) : 0;
 				}
-			} else {
-				if ((dwmci_readl(host, DWMCI_RINTSTS) &
-				     DWMCI_INTMSK_TXDR)) {
+				dwmci_writel(host, DWMCI_RINTSTS,
+					     DWMCI_INTMSK_RXDR);
+			} else if (data->flags == MMC_DATA_WRITE &&
+				   (mask & DWMCI_INTMSK_TXDR)) {
+				while (size) {
 					len = dwmci_readl(host, DWMCI_STATUS);
 					len = fifo_depth - ((len >>
 						   DWMCI_FIFO_SHIFT) &
@@ -144,11 +145,11 @@ static int dwmci_data_transfer(struct dwmci_host *host, struct mmc_data *data)
 					for (i = 0; i < len; i++)
 						dwmci_writel(host, DWMCI_DATA,
 							     *buf++);
-					dwmci_writel(host, DWMCI_RINTSTS,
-						     DWMCI_INTMSK_TXDR);
+					size = size > len ? (size - len) : 0;
 				}
+				dwmci_writel(host, DWMCI_RINTSTS,
+					     DWMCI_INTMSK_TXDR);
 			}
-			size = size > len ? (size - len) : 0;
 		}
 
 		/* Data arrived correctly. */