In some cases, the stronger 33 Ohm driver strength must not be used so it is not a suitable default. Change it to the standard default 50 Ohm value.
The patch applies to v4.2+ except the file name changed. It is drivers/mmc/host/sdhci-pci.c prior to v.4.4. Signed-off-by: Adrian Hunter <[email protected]> Cc: [email protected] # v4.2+ --- drivers/mmc/host/sdhci-pci-core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/mmc/host/sdhci-pci-core.c b/drivers/mmc/host/sdhci-pci-core.c index cf7ad458b4f4..08f4a9fe8550 100644 --- a/drivers/mmc/host/sdhci-pci-core.c +++ b/drivers/mmc/host/sdhci-pci-core.c @@ -277,7 +277,7 @@ static int spt_select_drive_strength(struct sdhci_host *host, if (sdhci_pci_spt_drive_strength > 0) drive_strength = sdhci_pci_spt_drive_strength & 0xf; else - drive_strength = 1; /* 33-ohm */ + drive_strength = 0; /* Default 50-ohm */ if ((mmc_driver_type_mask(drive_strength) & card_drv) == 0) drive_strength = 0; /* Default 50-ohm */ -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
