[PATCH v2 08/40] mmc: dw_mmc: Extract DMA transfer handling code into a separate routine

[Sam Protsenko]

Make dwmci_send_cmd() easier to read by moving the DMA transfer handling
code into a dedicated function.

No functional change.

Signed-off-by: Sam Protsenko <semen.protsenko at linaro.org>
Reviewed-by: Quentin Schulz <quentin.schulz at cherry.de>
---
Changes in v2:
  - Added R-b tag from Quentin

 drivers/mmc/dw_mmc.c | 51 ++++++++++++++++++++++++++------------------
 1 file changed, 30 insertions(+), 21 deletions(-)

diff --git a/drivers/mmc/dw_mmc.c b/drivers/mmc/dw_mmc.c
index 37a1125fba4f..7b20f4936b62 100644
--- a/drivers/mmc/dw_mmc.c
+++ b/drivers/mmc/dw_mmc.c
@@ -233,6 +233,33 @@ static int dwmci_data_transfer(struct dwmci_host *host, struct mmc_data *data)
 	return ret;
 }
 
+static int dwmci_dma_transfer(struct dwmci_host *host, uint flags,
+			      struct bounce_buffer *bbstate)
+{
+	int ret;
+	u32 mask, ctrl;
+
+	if (flags == MMC_DATA_READ)
+		mask = DWMCI_IDINTEN_RI;
+	else
+		mask = DWMCI_IDINTEN_TI;
+
+	ret = wait_for_bit_le32(host->ioaddr + DWMCI_IDSTS,
+				mask, true, 1000, false);
+	if (ret)
+		debug("%s: DWMCI_IDINTEN mask 0x%x timeout\n", __func__, mask);
+
+	/* Clear interrupts */
+	dwmci_writel(host, DWMCI_IDSTS, DWMCI_IDINTEN_MASK);
+
+	ctrl = dwmci_readl(host, DWMCI_CTRL);
+	ctrl &= ~DWMCI_DMA_EN;
+	dwmci_writel(host, DWMCI_CTRL, ctrl);
+
+	bounce_buffer_stop(bbstate);
+	return ret;
+}
+
 static int dwmci_set_transfer_mode(struct dwmci_host *host,
 		struct mmc_data *data)
 {
@@ -275,7 +302,7 @@ static int dwmci_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd,
 				 data ? DIV_ROUND_UP(data->blocks, 8) : 0);
 	int ret = 0, flags = 0, i;
 	u32 retry = 100000;
-	u32 mask, ctrl;
+	u32 mask;
 	struct bounce_buffer bbstate;
 
 	dwmci_wait_while_busy(host, cmd);
@@ -384,26 +411,8 @@ static int dwmci_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd,
 
 	if (data) {
 		ret = dwmci_data_transfer(host, data);
-
-		/* only dma mode need it */
-		if (!host->fifo_mode) {
-			if (data->flags == MMC_DATA_READ)
-				mask = DWMCI_IDINTEN_RI;
-			else
-				mask = DWMCI_IDINTEN_TI;
-			ret = wait_for_bit_le32(host->ioaddr + DWMCI_IDSTS,
-						mask, true, 1000, false);
-			if (ret)
-				debug("%s: DWMCI_IDINTEN mask 0x%x timeout.\n",
-				      __func__, mask);
-			/* clear interrupts */
-			dwmci_writel(host, DWMCI_IDSTS, DWMCI_IDINTEN_MASK);
-
-			ctrl = dwmci_readl(host, DWMCI_CTRL);
-			ctrl &= ~(DWMCI_DMA_EN);
-			dwmci_writel(host, DWMCI_CTRL, ctrl);
-			bounce_buffer_stop(&bbstate);
-		}
+		if (!host->fifo_mode)
+			ret = dwmci_dma_transfer(host, data->flags, &bbstate);
 	}
 
 	udelay(100);
-- 
2.39.2