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mmc: sdhci-pci: Do not default to 33 Ohm driver strength for Intel SPT 

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 <adrian.hunter@intel.com>
Cc: stable@vger.kernel.org # v4.2+
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Adrian Hunter 2015-11-26 14:00:45 +02:00 committed by Ulf Hansson
parent adb24d42a5
commit 1ca8968562
1 changed files with 1 additions and 1 deletions
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2
drivers/mmc/host/sdhci-pci-core.c
View File

@ -277,7 +277,7 @@ static int spt_select_drive_strength(struct sdhci_host *host,
if (sdhci_pci_spt_drive_strength > 0) if (sdhci_pci_spt_drive_strength > 0)
drive_strength = sdhci_pci_spt_drive_strength & 0xf; drive_strength = sdhci_pci_spt_drive_strength & 0xf;
else else
drive_strength = 1; /* 33-ohm */ drive_strength = 0; /* Default 50-ohm */
if ((mmc_driver_type_mask(drive_strength) & card_drv) == 0) if ((mmc_driver_type_mask(drive_strength) & card_drv) == 0)
drive_strength = 0; /* Default 50-ohm */ drive_strength = 0; /* Default 50-ohm */