mmc: dw_mmc: mmc_test related fixes

index 10b6979..fcff3c0 100644
@@ -287,7 +287,7 @@ static void send_stop_cmd(struct dw_mci *host, struct mmc_data *data)
 /* DMA interface functions */
 static void dw_mci_stop_dma(struct dw_mci *host)
 {
-	if (host->use_dma) {
+	if (host->using_dma) {
 		host->dma_ops->stop(host);
 		host->dma_ops->cleanup(host);
 	} else {

@@ -435,6 +435,8 @@ static int dw_mci_submit_data_dma(struct dw_mci *host, struct mmc_data *data)
 	unsigned int i, direction, sg_len;
 	u32 temp;
 
+	host->using_dma = 0;
+
 	/* If we don't have a channel, we can't do DMA */
 	if (!host->use_dma)
 		return -ENODEV;

@@ -454,6 +456,8 @@ static int dw_mci_submit_data_dma(struct dw_mci *host, struct mmc_data *data)
 			return -EINVAL;
 	}
 
+	host->using_dma = 1;
+
 	if (data->flags & MMC_DATA_READ)
 		direction = DMA_FROM_DEVICE;
 	else

index f3f68ee..6b46819 100644
@@ -48,6 +48,7 @@ struct mmc_data;
  * @data: The data currently being transferred, or NULL if no data
  *	transfer is in progress.
  * @use_dma: Whether DMA channel is initialized or not.
+ * @using_dma: Whether DMA is in use for the current transfer.
  * @sg_dma: Bus address of DMA buffer.
  * @sg_cpu: Virtual address of DMA buffer.
  * @dma_ops: Pointer to platform-specific DMA callbacks.

@@ -121,6 +122,7 @@ struct dw_mci {
 
 	/* DMA interface members*/
 	int			use_dma;
+	int			using_dma;
 
 	dma_addr_t		sg_dma;
 	void			*sg_cpu;

index fcff3c0..bf2157a 100644
@@ -908,12 +908,8 @@ static void dw_mci_tasklet_func(unsigned long priv)
 
 			if (status & DW_MCI_DATA_ERROR_FLAGS) {
 				if (status & SDMMC_INT_DTO) {
-					dev_err(&host->pdev->dev,
-						"data timeout error\n");
 					data->error = -ETIMEDOUT;
 				} else if (status & SDMMC_INT_DCRC) {
-					dev_err(&host->pdev->dev,
-						"data CRC error\n");
 					data->error = -EILSEQ;
 				} else {
 					dev_err(&host->pdev->dev,

index bf2157a..0dac397 100644
@@ -496,15 +496,16 @@ static void dw_mci_submit_data(struct dw_mci *host, struct mmc_data *data)
 	host->sg = NULL;
 	host->data = data;
 
+	if (data->flags & MMC_DATA_READ)
+		host->dir_status = DW_MCI_RECV_STATUS;
+	else
+		host->dir_status = DW_MCI_SEND_STATUS;
+
 	if (dw_mci_submit_data_dma(host, data)) {
 		host->sg = data->sg;
 		host->pio_offset = 0;
 		host->part_buf_start = 0;
 		host->part_buf_count = 0;
-		if (data->flags & MMC_DATA_READ)
-			host->dir_status = DW_MCI_RECV_STATUS;
-		else
-			host->dir_status = DW_MCI_SEND_STATUS;
 
 		mci_writel(host, RINTSTS, SDMMC_INT_TXDR | SDMMC_INT_RXDR);
 		temp = mci_readl(host, INTMASK);

@@ -911,6 +912,16 @@ static void dw_mci_tasklet_func(unsigned long priv)
 					data->error = -ETIMEDOUT;
 				} else if (status & SDMMC_INT_DCRC) {
 					data->error = -EILSEQ;
+				} else if (status & SDMMC_INT_EBE &&
+					   host->dir_status ==
+							DW_MCI_SEND_STATUS) {
+					/*
+					 * No data CRC status was returned.
+					 * The number of bytes transferred will
+					 * be exaggerated in PIO mode.
+					 */
+					data->bytes_xfered = 0;
+					data->error = -ETIMEDOUT;
 				} else {
 					dev_err(&host->pdev->dev,
 						"data FIFO error "

index 0dac397..0c839d3 100644
@@ -849,7 +849,7 @@ static void dw_mci_tasklet_func(unsigned long priv)
 	struct mmc_command *cmd;
 	enum dw_mci_state state;
 	enum dw_mci_state prev_state;
-	u32 status;
+	u32 status, ctrl;
 
 	spin_lock(&host->lock);
 

@@ -929,6 +929,16 @@ static void dw_mci_tasklet_func(unsigned long priv)
 						status);
 					data->error = -EIO;
 				}
+				/*
+				 * After an error, there may be data lingering
+				 * in the FIFO, so reset it - doing so
+				 * generates a block interrupt, hence setting
+				 * the scatter-gather pointer to NULL.
+				 */
+				host->sg = NULL;
+				ctrl = mci_readl(host, CTRL);
+				ctrl |= SDMMC_CTRL_FIFO_RESET;
+				mci_writel(host, CTRL, ctrl);
 			} else {
 				data->bytes_xfered = data->blocks * data->blksz;
 				data->error = 0;