[PATCH v2 2/2] mmc: sdhci-pci: Avoid 3.3V signaling on some NI 904x

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From: Kyle Roeschley <kyle.roeschley@xxxxxx>

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@xxxxxx>
Signed-off-by: Jennifer Dahm <jennifer.dahm@xxxxxx>
---
 drivers/mmc/host/sdhci-pci-core.c | 4 ++++
 drivers/mmc/host/sdhci-pci.h      | 1 +
 2 files changed, 5 insertions(+)

diff --git a/drivers/mmc/host/sdhci-pci-core.c b/drivers/mmc/host/sdhci-pci-core.c
index 787434e..ad0ca86 100644
--- a/drivers/mmc/host/sdhci-pci-core.c
+++ b/drivers/mmc/host/sdhci-pci-core.c
@@ -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;
 }
 
diff --git a/drivers/mmc/host/sdhci-pci.h b/drivers/mmc/host/sdhci-pci.h
index 5cbcdc4..db9cb54 100644
--- a/drivers/mmc/host/sdhci-pci.h
+++ b/drivers/mmc/host/sdhci-pci.h
@@ -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
-- 
2.7.4

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