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mmc: sdio: Fix SDIO 3.0 UHS-I initialization sequence 

According to UHS-I initialization sequence for SDIO 3.0 cards,
the host must set bit[24] (S18R) of OCR register during OCR
handshake to know whether the SDIO card is capable of doing
1.8V I/O.

Signed-off-by: Sujit Reddy Thumma <sthumma@codeaurora.org>
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
Reviewed-by: Johan Rudholm <johan.rudholm@stericsson.com>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Sujit Reddy Thumma 2012-12-04 17:06:19 +05:30 committed by Chris Ball
parent 51aa66a584
commit 41875e3884
2 changed files with 19 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
drivers/mmc/core/sdio.c
View File

@ -157,10 +157,7 @@ static int sdio_read_cccr(struct mmc_card *card, u32 ocr)
if (ret)
goto out;
if (card->host->caps &
(MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 |
MMC_CAP_UHS_DDR50)) {
if (mmc_host_uhs(card->host)) {
if (data & SDIO_UHS_DDR50)
card->sw_caps.sd3_bus_mode
|= SD_MODE_UHS_DDR50;
@ -478,8 +475,7 @@ static int sdio_set_bus_speed_mode(struct mmc_card *card)
* If the host doesn't support any of the UHS-I modes, fallback on
* default speed.
*/
if (!(card->host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50)))
if (!mmc_host_uhs(card->host))
return 0;
bus_speed = SDIO_SPEED_SDR12;
@ -645,11 +641,7 @@ static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
* systems that claim 1.8v signalling in fact do not support
* it.
*/
if ((ocr & R4_18V_PRESENT) &&
(host->caps &
(MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 |
MMC_CAP_UHS_DDR50))) {
if ((ocr & R4_18V_PRESENT) && mmc_host_uhs(host)) {
err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180,
true);
if (err) {
@ -1022,6 +1014,10 @@ static int mmc_sdio_power_restore(struct mmc_host *host)
goto out;
}
if (mmc_host_uhs(host))
/* to query card if 1.8V signalling is supported */
host->ocr |= R4_18V_PRESENT;
ret = mmc_sdio_init_card(host, host->ocr, host->card,
mmc_card_keep_power(host));
if (!ret && host->sdio_irqs)
@ -1087,6 +1083,10 @@ int mmc_attach_sdio(struct mmc_host *host)
/*
* Detect and init the card.
*/
if (mmc_host_uhs(host))
/* to query card if 1.8V signalling is supported */
host->ocr |= R4_18V_PRESENT;
err = mmc_sdio_init_card(host, host->ocr, NULL, 0);
if (err) {
if (err == -EAGAIN) {

8
include/linux/mmc/host.h
View File

@ -434,6 +434,14 @@ static inline int mmc_boot_partition_access(struct mmc_host *host)
return !(host->caps2 & MMC_CAP2_BOOTPART_NOACC);
}
static inline int mmc_host_uhs(struct mmc_host *host)
{
return host->caps &
(MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 |
MMC_CAP_UHS_DDR50);
}
#ifdef CONFIG_MMC_CLKGATE
void mmc_host_clk_hold(struct mmc_host *host);
void mmc_host_clk_release(struct mmc_host *host);