1 files changed, 15 insertions, 0 deletions

diff --git a/drivers/mmc/host/sdhci-pci-core.c b/drivers/mmc/host/sdhci-pci-core.c
index bbaddf18a1b3..d0ccc6729fd2 100644
--- a/drivers/mmc/host/sdhci-pci-core.c
+++ b/drivers/mmc/host/sdhci-pci-core.c
@@ -392,6 +392,7 @@ static const struct sdhci_pci_fixes sdhci_intel_pch_sdio = {
 
 enum {
         INTEL_DSM_FNS           =  0,
+        INTEL_DSM_V18_SWITCH    =  3,
         INTEL_DSM_DRV_STRENGTH  =  9,
         INTEL_DSM_D3_RETUNE     = 10,
 };
@@ -557,6 +558,19 @@ static void intel_hs400_enhanced_strobe(struct mmc_host *mmc,
         sdhci_writel(host, val, INTEL_HS400_ES_REG);
 }
 
+static void sdhci_intel_voltage_switch(struct sdhci_host *host)
+{
+        struct sdhci_pci_slot *slot = sdhci_priv(host);
+        struct intel_host *intel_host = sdhci_pci_priv(slot);
+        struct device *dev = &slot->chip->pdev->dev;
+        u32 result = 0;
+        int err;
+
+        err = intel_dsm(intel_host, dev, INTEL_DSM_V18_SWITCH, &result);
+        pr_debug("%s: %s DSM error %d result %u\n",
+                 mmc_hostname(host->mmc), __func__, err, result);
+}
+
 static const struct sdhci_ops sdhci_intel_byt_ops = {
         .set_clock              = sdhci_set_clock,
         .set_power              = sdhci_intel_set_power,
@@ -565,6 +579,7 @@ static const struct sdhci_ops sdhci_intel_byt_ops = {
         .reset                  = sdhci_reset,
         .set_uhs_signaling      = sdhci_set_uhs_signaling,
         .hw_reset               = sdhci_pci_hw_reset,
+        .voltage_switch         = sdhci_intel_voltage_switch,
 };
 
 static void byt_read_dsm(struct sdhci_pci_slot *slot)