diff options
Diffstat (limited to 'drivers/mmc/host')
| -rw-r--r-- | drivers/mmc/host/sdhci.c | 27 |
1 files changed, 24 insertions, 3 deletions
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 8072e16..409cde5 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -1243,13 +1243,12 @@ static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) else ctrl &= ~SDHCI_CTRL_HISPD; - sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); - if (host->version >= SDHCI_SPEC_300) { u16 ctrl_2; ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2); if (!(ctrl_2 & SDHCI_CTRL_PRESET_VAL_ENABLE)) { + sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); /* * We only need to set Driver Strength if the * preset value enable is not set. @@ -1261,8 +1260,30 @@ static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) ctrl_2 |= SDHCI_CTRL_DRV_TYPE_C; sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2); + } else { + /* + * According to SDHC Spec v3.00, if the Preset Value + * Enable in the Host Control 2 register is set, we + * need to reset SD Clock Enable before changing High + * Speed Enable to avoid generating clock gliches. + */ + u16 clk; + unsigned int clock; + + /* Reset SD Clock Enable */ + clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL); + clk &= ~SDHCI_CLOCK_CARD_EN; + sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL); + + sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); + + /* Re-enable SD Clock */ + clock = host->clock; + host->clock = 0; + sdhci_set_clock(host, clock); } - } + } else + sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); /* * Some (ENE) controllers go apeshit on some ios operation, |