[PATCH] mmc: sdio: Fix 1-bit mode for SD-combo cards during suspend

[Yue Hu <zbestahu@gmail.com>]

From: Yue Hu <huyue2@yulong.com>

Commit 6b5eda369ac3 ("sdio: put active devices into 1-bit mode during
suspend") disabled 4-bit mode during system suspend. After this patch,
commit 7310ece86ad7 ("mmc: implement SD-combo (IO+mem) support") used
new sdio_enable_4bit_bus() instead of sdio_enable_wide() to support
SD-combo cards, also for card resume. However, no corresponding support
added during suspend. That is not correct. Let's fix it.

Signed-off-by: Yue Hu <huyue2@yulong.com>
---
 drivers/mmc/core/sdio.c | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
index ebb387a..2d2ae35 100644
--- a/drivers/mmc/core/sdio.c
+++ b/drivers/mmc/core/sdio.c
@@ -285,6 +285,27 @@ static int sdio_disable_wide(struct mmc_card *card)
 	return 0;
 }
 
+static int sdio_disable_4bit_bus(struct mmc_card *card)
+{
+	int err;
+
+	if (card->type == MMC_TYPE_SDIO)
+		goto out;
+
+	if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
+		return 0;
+
+	if (!(card->scr.bus_widths & SD_SCR_BUS_WIDTH_4))
+		return 0;
+
+	err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
+	if (err)
+		return err;
+
+out:
+	return sdio_disable_wide(card);
+}
+
 
 static int sdio_enable_4bit_bus(struct mmc_card *card)
 {
@@ -960,7 +981,7 @@ static int mmc_sdio_suspend(struct mmc_host *host)
 	mmc_claim_host(host);
 
 	if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host))
-		sdio_disable_wide(host->card);
+		sdio_disable_4bit_bus(host->card);
 
 	if (!mmc_card_keep_power(host)) {
 		mmc_power_off(host);
-- 
1.9.1