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mmc: sdhci-pci: Avoid 3.3V signaling on some NI 904x 

On some NI 904x devices, using 3.3V signaling for extended periods of
time will physically damage the pads connected to the SDHC, eventually
causing complete failure of the controller. To work around this,
require that we avoid 3.3V signaling.

Signed-off-by: Kyle Roeschley <kyle.roeschley@ni.com>
Signed-off-by: Jennifer Dahm <jennifer.dahm@ni.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Kyle Roeschley 2018-04-13 16:54:58 -05:00 committed by Ulf Hansson
parent 247cfe5355
commit bb26b8412d
2 changed files with 5 additions and 0 deletions
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4
drivers/mmc/host/sdhci-pci-core.c
View File

@ -832,6 +832,10 @@ static int byt_sd_probe_slot(struct sdhci_pci_slot *slot)
slot->chip->pdev->device == PCI_DEVICE_ID_INTEL_GLK_SD)
slot->host->mmc_host_ops.get_cd = bxt_get_cd;
if (slot->chip->pdev->subsystem_vendor == PCI_VENDOR_ID_NI &&
slot->chip->pdev->subsystem_device == PCI_SUBDEVICE_ID_NI_78E3)
slot->host->mmc->caps2 |= MMC_CAP2_AVOID_3_3V;
return 0;
}

1
drivers/mmc/host/sdhci-pci.h
View File

@ -54,6 +54,7 @@
#define PCI_DEVICE_ID_REALTEK_5250 0x5250
#define PCI_SUBDEVICE_ID_NI_7884 0x7884
#define PCI_SUBDEVICE_ID_NI_78E3 0x78e3
#define PCI_VENDOR_ID_ARASAN 0x16e6
#define PCI_DEVICE_ID_ARASAN_PHY_EMMC 0x0670