From: Kevin Liu <kliu5@xxxxxxxxxxx>
Host controller must enable 1.8v signal for UHS modes.
Otherwise UHS modes won't take effect.
But mmc core does NOT switch to 1.8v for DDR50 mode.
So enable the 1.8v signal for mmc DDR50 mode in host
driver.
Signed-off-by: Kevin Liu <kliu5@xxxxxxxxxxx>
---
drivers/mmc/host/sdhci.c | 9 ++++++++-
1 files changed, 8 insertions(+), 1 deletions(-)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 50e7a54..e3de041 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1529,8 +1529,15 @@ static void sdhci_do_set_ios(struct sdhci_host *host, struct mmc_ios *ios)
ctrl_2 |= SDHCI_CTRL_UHS_SDR50;
else if (ios->timing == MMC_TIMING_UHS_SDR104)
ctrl_2 |= SDHCI_CTRL_UHS_SDR104;
- else if (ios->timing == MMC_TIMING_UHS_DDR50)
+ else if (ios->timing == MMC_TIMING_UHS_DDR50) {
+ struct mmc_card *card;
+
ctrl_2 |= SDHCI_CTRL_UHS_DDR50;
+ card = container_of(&(host->mmc),
+ struct mmc_card, host);
+ if (mmc_card_mmc(card))
+ ctrl_2 |= SDHCI_CTRL_VDD_180;
+ }
sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
}
if (!(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN) &&
--
1.7.0.4
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