mmc: sdio: Enable SDIO 4-bit bus if not support SD_SCR_BUS_WIDTH_4 for SD combo card

Message ID 20200608080619.9388-1-zbestahu@gmail.com
State New
Headers show
Series
  • mmc: sdio: Enable SDIO 4-bit bus if not support SD_SCR_BUS_WIDTH_4 for SD combo card
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Commit Message

Yue Hu June 8, 2020, 8:06 a.m.
From: Yue Hu <huyue2@yulong.com>

If the card type is SD combo and the memory part does not support wider
bus(SD_SCR_BUS_WIDTH_4), nothing will be done except return 0. However,
we should check whether SDIO part support wider bus or not just like
the behavior about enabling high speed mode in sdio_enable_hs().

In addition, there's a duplicated check to MMC_CAP_4_BIT_DATA since
sdio_enable_wide() will include that check. And we can also save one
call site to sdio_enable_wide() after this change.

Signed-off-by: Yue Hu <huyue2@yulong.com>
---
 drivers/mmc/core/sdio.c | 26 ++++++++++++--------------
 1 file changed, 12 insertions(+), 14 deletions(-)

Patch

diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
index ebb387a..cacc863 100644
--- a/drivers/mmc/core/sdio.c
+++ b/drivers/mmc/core/sdio.c
@@ -290,25 +290,23 @@  static int sdio_enable_4bit_bus(struct mmc_card *card)
 {
 	int err;
 
+	err = sdio_enable_wide(card);
+	if (err <= 0)
+		return err;
 	if (card->type == MMC_TYPE_SDIO)
-		err = sdio_enable_wide(card);
-	else if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
-		 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
+		goto out;
+
+	if (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4) {
 		err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
-		if (err)
+		if (err) {
+			sdio_disable_wide(card);
 			return err;
-		err = sdio_enable_wide(card);
-		if (err <= 0)
-			mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
-	} else
-		return 0;
-
-	if (err > 0) {
-		mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
-		err = 0;
+		}
 	}
+out:
+	mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
 
-	return err;
+	return 0;
 }