mmc: tmio: no magic values when enabling DMA

Use a proper define.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/renesas_sdhi_core.c

@@ -452,7 +452,7 @@ static int renesas_sdhi_multi_io_quirk(struct mmc_card *card,
 
 static void renesas_sdhi_enable_dma(struct tmio_mmc_host *host, bool enable)
 {
-	sd_ctrl_write16(host, CTL_DMA_ENABLE, enable ? 2 : 0);
+	sd_ctrl_write16(host, CTL_DMA_ENABLE, enable ? DMA_ENABLE_DMASDRW : 0);
 
 	/* enable 32bit access if DMA mode if possibile */
 	renesas_sdhi_sdbuf_width(host, enable ? 32 : 16);

drivers/mmc/host/tmio_mmc.h

@@ -97,6 +97,9 @@
 
 #define TMIO_SDIO_SETBITS_MASK	0x0006
 
+/* Definitions for values the CTL_DMA_ENABLE register can take */
+#define DMA_ENABLE_DMASDRW	BIT(1)
+
 /* Define some IRQ masks */
 /* This is the mask used at reset by the chip */
 #define TMIO_MASK_ALL           0x837f031d