+static int jmicron_pmos(struct sdhci_pci_chip *chip, int on)
+{
+ u8 scratch;
+ int ret;
+
+ ret = pci_read_config_byte(chip->pdev, 0xAE, &scratch);
+ if (ret)
+ return ret;
+
+ /*
+ * Turn PMOS on [bit 0], set over current detection to 2.4 V
+ * [bit 1:2] and enable over current debouncing [bit 6].
+ */
+ if (on)
+ scratch |= 0x47;
+ else
+ scratch &= ~0x47;
+
+ ret = pci_write_config_byte(chip->pdev, 0xAE, scratch);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int jmicron_probe(struct sdhci_pci_chip *chip)
+{
+ int ret;
+
+ /*
+ * JMicron chips need a bit of a nudge to enable the power
+ * output pins.
+ */
+ ret = jmicron_pmos(chip, 1);
+ if (ret) {
+ dev_err(&chip->pdev->dev, "Failure enabling card power\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int jmicron_resume(struct sdhci_pci_chip *chip)
+{
+ int ret;
+
+ ret = jmicron_pmos(chip, 1);
+ if (ret) {
+ dev_err(&chip->pdev->dev, "Failure enabling card power\n");
+ return ret;
+ }
+
+ return 0;
+}
+