linux-kernel - [PATCH v2 3/4] mmc: dw_mmc: fix misleading error print if failing to do DMA transfer

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Date:   Fri,  2 Sep 2016 12:14:38 +0800
From:   Shawn Lin <shawn.lin@...k-chips.com>
To:     Jaehoon Chung <jh80.chung@...sung.com>
Cc:     Ulf Hansson <ulf.hansson@...aro.org>, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Doug Anderson <dianders@...omium.org>,
        Heiko Stuebner <heiko@...ech.de>,
        linux-rockchip@...ts.infradead.org,
        Shawn Lin <shawn.lin@...k-chips.com>
Subject: [PATCH v2 3/4] mmc: dw_mmc: fix misleading error print if failing to do DMA transfer

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 <shawn.lin@...k-chips.com>
---

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