From: Kevin Lemoi <kevin.lemoi@xxxxxxxxxx>
SDHCI_QUIRK2_NO_1_8_V flag should disable MMC_CAP_1_8V_DDR.
Otherwise we get the following errors when accessing eMMC on a mx6sl
board:
mmc0: MAN_BKOPS_EN bit is not set
mmc0: power class selection to bus width 8 ddr 4 failed
mmc0: error -110 whilst initialising MMC card
mmc0: MAN_BKOPS_EN bit is not set
mmc0: power class selection to bus width 8 ddr 4 failed
mmc0: error -110 whilst initialising MMC card
mmc0: MAN_BKOPS_EN bit is not set
mmc0: power class selection to bus width 8 ddr 4 failed
mmc0: error -110 whilst initialising MMC card
With this fix in place it is possible to successfully mount the rootfs
from the emmc on the mx6sl board with 'no-1-8-v' property passed in the
device tree.
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Kevin Lemoi <kevin.lemoi@xxxxxxxxxx>
Signed-off-by: Fabio Estevam <fabio.estevam@xxxxxxxxxxxxx>
---
drivers/mmc/host/sdhci.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 706bb60..10304cc 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -3140,9 +3140,11 @@ int sdhci_add_host(struct sdhci_host *host)
}
}
- if (host->quirks2 & SDHCI_QUIRK2_NO_1_8_V)
+ if (host->quirks2 & SDHCI_QUIRK2_NO_1_8_V) {
caps[1] &= ~(SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 |
SDHCI_SUPPORT_DDR50);
+ mmc->caps &= ~MMC_CAP_1_8V_DDR;
+ }
/* Any UHS-I mode in caps implies SDR12 and SDR25 support. */
if (caps[1] & (SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 |
--
1.9.1
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