linux-kernel - [PATCH 1/2] mmc: uniphier-sd: fix DMA disabling

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Message-Id: <1539356258-12374-2-git-send-email-yamada.masahiro@socionext.com>
Date:   Fri, 12 Oct 2018 23:57:37 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     linux-mmc@...r.kernel.org, Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] 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@...ionext.com>
---

 drivers/mmc/host/uniphier-sd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mmc/host/uniphier-sd.c b/drivers/mmc/host/uniphier-sd.c
index 10e7b30..10d49aa 100644
--- a/drivers/mmc/host/uniphier-sd.c
+++ b/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 */
-- 
2.7.4