From: Masahiro Yamada <yamada.masahiro@socionext.com>
To: linux-mmc@vger.kernel.org, Ulf Hansson <ulf.hansson@linaro.org>
Cc: Wolfram Sang <wsa+renesas@sang-engineering.com>,
Masahiro Yamada <yamada.masahiro@socionext.com>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: [PATCH 2/2] mmc: uniphier-sd: avoid using broken DMA RX channel
Date: Fri, 12 Oct 2018 23:57:38 +0900 [thread overview]
Message-ID: <1539356258-12374-3-git-send-email-yamada.masahiro@socionext.com> (raw)
In-Reply-To: <1539356258-12374-1-git-send-email-yamada.masahiro@socionext.com>
host->chan_rx is NULL when UNIPHIER_SD_CAP_BROKEN_DMA_RX quirk flag
is set. In this case, it should not set up DMA.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
---
drivers/mmc/host/uniphier-sd.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/mmc/host/uniphier-sd.c b/drivers/mmc/host/uniphier-sd.c
index 10d49aa..1ee9fd0 100644
--- a/drivers/mmc/host/uniphier-sd.c
+++ b/drivers/mmc/host/uniphier-sd.c
@@ -251,6 +251,9 @@ static void uniphier_sd_internal_dma_start(struct tmio_mmc_host *host,
u32 dma_mode;
int sg_len;
+ if ((data->flags & MMC_DATA_READ) && !host->chan_rx)
+ goto force_pio;
+
if (WARN_ON(host->sg_len != 1))
goto force_pio;
--
2.7.4
next prev parent reply other threads:[~2018-10-12 14:58 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-12 14:57 [PATCH 0/2] mmc: uniphier-sd: two bug-fixes Masahiro Yamada
2018-10-12 14:57 ` [PATCH 1/2] mmc: uniphier-sd: fix DMA disabling Masahiro Yamada
2018-10-14 22:33 ` Wolfram Sang
2018-10-15 13:15 ` Ulf Hansson
2018-10-12 14:57 ` Masahiro Yamada [this message]
2018-10-14 22:35 ` [PATCH 2/2] mmc: uniphier-sd: avoid using broken DMA RX channel Wolfram Sang
2018-10-15 13:15 ` Ulf Hansson
2018-10-14 22:33 ` [PATCH 0/2] mmc: uniphier-sd: two bug-fixes Wolfram Sang
2018-10-15 3:12 ` Masahiro Yamada
2018-10-15 7:33 ` Wolfram Sang
2018-10-15 12:51 ` Ulf Hansson
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