mmc: uniphier-sd: fix DMA disabling

Once DMA is enabled, it is not possible to disable it because
uniphier_sd_dma_endisable() always sets the DMA_ENABLE_DMASDRW bit
regardless of the argument 'enable'. It should disable DMA when
'enable' is false.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/uniphier-sd.c

@@ -78,7 +78,7 @@ static void *uniphier_sd_priv(struct tmio_mmc_host *host)
 
 static void uniphier_sd_dma_endisable(struct tmio_mmc_host *host, int enable)
 {
-	sd_ctrl_write16(host, CTL_DMA_ENABLE, DMA_ENABLE_DMASDRW);
+	sd_ctrl_write16(host, CTL_DMA_ENABLE, enable ? DMA_ENABLE_DMASDRW : 0);
 }
 
 /* external DMA engine */