[PATCH 3/5] SDIO: Don't use CMD[357] as part of a powered SDIO resume

Nicolas Pitre
2010-02-09T20:29:52Z

From: Chris Ball <cjb@laptop.org>

Seen on a Marvell 8686 SDIO card and Via VX855 controller: we must avoid
sending CMD3/5/7 on a resume where power has been maintained, because the
8686 will refuse to respond to them and the MMC stack will give up on
the card.

Signed-off-by: Chris Ball <cjb@laptop.org>
Signed-off-by: Nicolas Pitre <nico@marvell.com>
---
drivers/mmc/core/sdio.c | 19 +++++++++++--------
1 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
index 06b6408..7d8ba64 100644
--- a/drivers/mmc/core/sdio.c
+++ b/drivers/mmc/core/sdio.c
@@ -224,7 +224,7 @@ 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 +235,11 @@ 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 +264,7 @@ 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 +275,7 @@ 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;
@@ -437,7 +439,8 @@ 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));
mmc_release_host(host);

/*
@@ -507,7 +510,7 @@ 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;
--
1.7.0.rc2.1.g694b5