[PATCH v2 3/4] mmc: dw_mmc: fix misleading error print if failing to do DMA transfer
From: Shawn Lin <hidden>
Date: 2016-09-02 04:19:58
Also in:
linux-rockchip, lkml
Subsystem:
multimedia card (mmc), secure digital (sd) and sdio subsystem, synopsys designware mmc/sd/sdio driver, the rest · Maintainers:
Ulf Hansson, Jaehoon Chung, Shawn Lin, Linus Torvalds
The original log didn't figure out that we could still finish this transfer by PIO mode even if failing to use DMA. And it should be kept for debug level instead of error one. Signed-off-by: Shawn Lin <redacted> --- Changes in v2: None drivers/mmc/host/dw_mmc.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index daa1c52..833b6ad 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c@@ -1057,8 +1057,10 @@ static int dw_mci_submit_data_dma(struct dw_mci *host, struct mmc_data *data) spin_unlock_irqrestore(&host->irq_lock, irqflags); if (host->dma_ops->start(host, sg_len)) { - /* We can't do DMA */ - dev_err(host->dev, "%s: failed to start DMA.\n", __func__); + /* We can't do DMA, try PIO for this one */ + dev_dbg(host->dev, + "%s: fall back to PIO mode for current transfer\n", + __func__); return -ENODEV; }
--
2.3.7