diff options
| author | Sujit Reddy Thumma <sthumma@codeaurora.org> | 2012-12-04 11:36:19 (GMT) |
|---|---|---|
| committer | Chris Ball <cjb@laptop.org> | 2013-02-11 17:51:23 (GMT) |
| commit | 41875e388401ad97c33252d5fa39d52e0b70ee9b (patch) | |
| tree | 2f76e0c6660f00920589fde0fed7489d30008523 | |
| parent | 51aa66a58494f869f491eedda86c409c50536c14 (diff) | |
| download | linux-41875e388401ad97c33252d5fa39d52e0b70ee9b.tar.xz | |
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>
| -rw-r--r-- | drivers/mmc/core/sdio.c | 22 | ||||
| -rw-r--r-- | include/linux/mmc/host.h | 8 |
2 files changed, 19 insertions, 11 deletions
diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c index 34ad4c8..9565d38 100644 --- a/drivers/mmc/core/sdio.c +++ b/drivers/mmc/core/sdio.c @@ -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) { diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h index 61a10c1..c89a1bb 100644 --- a/include/linux/mmc/host.h +++ b/include/linux/mmc/host.h @@ -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); |