[PATCH 2/2] mmc: uniphier-sd: avoid using broken DMA RX channel
From: Masahiro Yamada <hidden>
Date: 2018-10-12 14:58:51
Also in:
linux-mmc, lkml
Subsystem:
arm/uniphier architecture, multimedia card (mmc), secure digital (sd) and sdio subsystem, the rest · Maintainers:
Kunihiko Hayashi, Masami Hiramatsu, Ulf Hansson, Linus Torvalds
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 <redacted> --- 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