[PATCH] mci: be more verbose about wrong bus-width

From: Christoph Fritz <chf.fritz@googlemail.com>
To: barebox@lists.infradead.org
Subject: [PATCH] mci: be more verbose about wrong bus-width
Date: Sun, 30 Apr 2017 15:45:58 +0200	[thread overview]
Message-ID: <1493559958.1977.38.camel@googlemail.com> (raw)

If configured or default bus-width is wrong for the current hardware,
registration of card/emmc is likely to fail.  This patch adds more verbosity
in the case of a failed detection:

    | omap-hsmmc 48060000.mmc: registered as 48060000.mmc
    | mmc0: detected MMC card version 4.41
    | mmc0: Changing MMC bus width failed: -110
    | mmc0: Card's startup fails with -110

Signed-off-by: Christoph Fritz <chf.fritz@googlemail.com>
---
 drivers/mci/mci-core.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/mci/mci-core.c b/drivers/mci/mci-core.c
index b173a17..3da1c26 100644
--- a/drivers/mci/mci-core.c
+++ b/drivers/mci/mci-core.c
@@ -984,7 +984,7 @@ static int mci_startup_sd(struct mci *mci)
 		mci_setup_cmd(&cmd, SD_CMD_APP_SET_BUS_WIDTH, 2, MMC_RSP_R1);
 		err = mci_send_cmd(mci, &cmd, NULL);
 		if (err) {
-			dev_dbg(&mci->dev, "Changing SD bus width failed: %d\n", err);
+			dev_warn(&mci->dev, "Changing SD bus width failed: %d\n", err);
 			/* TODO continue with 1 bit? */
 			return err;
 		}
@@ -1041,8 +1041,11 @@ static int mci_startup_mmc(struct mci *mci)
 		err = mci_switch(mci, EXT_CSD_CMD_SET_NORMAL,
 				 EXT_CSD_BUS_WIDTH,
 				 ext_csd_bits[idx]);
-		if (err)
+		if (err) {
+			if (idx == 0)
+				dev_warn(&mci->dev, "Changing MMC bus width failed: %d\n", err);
 			continue;
+		}
 
 		mci_set_bus_width(mci, bus_widths[idx]);
 
@@ -1051,7 +1054,7 @@ static int mci_startup_mmc(struct mci *mci)
 			break;
 	}
 
-	return 0;
+	return err;
 }
 
 /**
@@ -1693,7 +1696,7 @@ static int mci_card_probe(struct mci *mci)
 
 	rc = mci_startup(mci);
 	if (rc) {
-		dev_dbg(&mci->dev, "Card's startup fails with %d\n", rc);
+		dev_warn(&mci->dev, "Card's startup fails with %d\n", rc);
 		goto on_error;
 	}
 
-- 
2.1.4


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