The patch titled sdio: put active devices into 1-bit mode during suspend has been added to the -mm tree. Its filename is sdio-put-active-devices-into-1-bit-mode-during-suspend.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find out what to do about this The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ Subject: sdio: put active devices into 1-bit mode during suspend From: Daniel Drake <dsd@xxxxxxxxxx> And bring them back to 4-bit mode during resume. Signed-off-by: Daniel Drake <dsd@xxxxxxxxxx> Signed-off-by: Nicolas Pitre <nico@xxxxxxxxxxx> Cc: <linux-mmc@xxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- drivers/mmc/core/sdio.c | 43 +++++++++++++++++++++++++++++++++++++ include/linux/mmc/sdio.h | 2 + 2 files changed, 45 insertions(+) diff -puN drivers/mmc/core/sdio.c~sdio-put-active-devices-into-1-bit-mode-during-suspend drivers/mmc/core/sdio.c --- a/drivers/mmc/core/sdio.c~sdio-put-active-devices-into-1-bit-mode-during-suspend +++ a/drivers/mmc/core/sdio.c @@ -188,6 +188,40 @@ static int sdio_disable_cd(struct mmc_ca } /* + * 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) @@ -427,6 +461,12 @@ static int mmc_sdio_suspend(struct mmc_h } } + if (!err && host->pm_flags & MMC_PM_KEEP_POWER) { + mmc_claim_host(host); + sdio_disable_wide(host->card); + mmc_release_host(host); + } + return err; } @@ -441,6 +481,9 @@ static int mmc_sdio_resume(struct mmc_ho mmc_claim_host(host); 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); diff -puN include/linux/mmc/sdio.h~sdio-put-active-devices-into-1-bit-mode-during-suspend include/linux/mmc/sdio.h --- a/include/linux/mmc/sdio.h~sdio-put-active-devices-into-1-bit-mode-during-suspend +++ a/include/linux/mmc/sdio.h @@ -95,6 +95,8 @@ #define SDIO_BUS_WIDTH_1BIT 0x00 #define SDIO_BUS_WIDTH_4BIT 0x02 +#define SDIO_BUS_ASYNC_INT 0x20 + #define SDIO_BUS_CD_DISABLE 0x80 /* disable pull-up on DAT3 (pin 1) */ #define SDIO_CCCR_CAPS 0x08 _ Patches currently in -mm which might be from dsd@xxxxxxxxxx are linux-next.patch sdio-put-active-devices-into-1-bit-mode-during-suspend.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html