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path: root/drivers/mmc/core/sdio.c
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Diffstat (limited to 'drivers/mmc/core/sdio.c')
-rw-r--r--drivers/mmc/core/sdio.c64
1 files changed, 56 insertions, 8 deletions
diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
index 06b64085a35..2dd4cfe7ca1 100644
--- a/drivers/mmc/core/sdio.c
+++ b/drivers/mmc/core/sdio.c
@@ -188,6 +188,40 @@ static int sdio_disable_cd(struct mmc_card *card)
}
/*
+ * Devices that remain active during a system suspend are
+ * put back into 1-bit mode.
+ */
+static int sdio_disable_wide(struct mmc_card *card)
+{
+ int ret;
+ u8 ctrl;
+
+ if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
+ return 0;
+
+ if (card->cccr.low_speed && !card->cccr.wide_bus)
+ return 0;
+
+ ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
+ if (ret)
+ return ret;
+
+ if (!(ctrl & SDIO_BUS_WIDTH_4BIT))
+ return 0;
+
+ ctrl &= ~SDIO_BUS_WIDTH_4BIT;
+ ctrl |= SDIO_BUS_ASYNC_INT;
+
+ ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
+ if (ret)
+ return ret;
+
+ mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1);
+
+ return 0;
+}
+
+/*
* Test if the card supports high-speed mode and, if so, switch to it.
*/
static int sdio_enable_hs(struct mmc_card *card)
@@ -224,7 +258,7 @@ static int sdio_enable_hs(struct mmc_card *card)
* we're trying to reinitialise.
*/
static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
- struct mmc_card *oldcard)
+ struct mmc_card *oldcard, int powered_resume)
{
struct mmc_card *card;
int err;
@@ -235,9 +269,11 @@ static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
/*
* Inform the card of the voltage
*/
- err = mmc_send_io_op_cond(host, host->ocr, &ocr);
- if (err)
- goto err;
+ if (!powered_resume) {
+ err = mmc_send_io_op_cond(host, host->ocr, &ocr);
+ if (err)
+ goto err;
+ }
/*
* For SPI, enable CRC as appropriate.
@@ -262,7 +298,7 @@ static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
/*
* For native busses: set card RCA and quit open drain mode.
*/
- if (!mmc_host_is_spi(host)) {
+ if (!powered_resume && !mmc_host_is_spi(host)) {
err = mmc_send_relative_addr(host, &card->rca);
if (err)
goto remove;
@@ -273,7 +309,7 @@ static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
/*
* Select card, as all following commands rely on that.
*/
- if (!mmc_host_is_spi(host)) {
+ if (!powered_resume && !mmc_host_is_spi(host)) {
err = mmc_select_card(card);
if (err)
goto remove;
@@ -425,6 +461,12 @@ static int mmc_sdio_suspend(struct mmc_host *host)
}
}
+ if (!err && host->pm_flags & MMC_PM_KEEP_POWER) {
+ mmc_claim_host(host);
+ sdio_disable_wide(host->card);
+ mmc_release_host(host);
+ }
+
return err;
}
@@ -437,7 +479,13 @@ static int mmc_sdio_resume(struct mmc_host *host)
/* Basic card reinitialization. */
mmc_claim_host(host);
- err = mmc_sdio_init_card(host, host->ocr, host->card);
+ err = mmc_sdio_init_card(host, host->ocr, host->card,
+ (host->pm_flags & MMC_PM_KEEP_POWER));
+ if (!err)
+ /* We may have switched to 1-bit mode during suspend. */
+ err = sdio_enable_wide(host->card);
+ if (!err && host->sdio_irqs)
+ mmc_signal_sdio_irq(host);
mmc_release_host(host);
/*
@@ -507,7 +555,7 @@ int mmc_attach_sdio(struct mmc_host *host, u32 ocr)
/*
* Detect and init the card.
*/
- err = mmc_sdio_init_card(host, host->ocr, NULL);
+ err = mmc_sdio_init_card(host, host->ocr, NULL, 0);
if (err)
goto err;
card = host->card;