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mmc: sdhci-pci: Fix 3.3V voltage switch for some BYT-based Intel controllers 

Fix 3.3V voltage switch for some BYT-based Intel controllers by making use
of the ACPI DSM.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Adrian Hunter 2018-04-13 16:18:27 +03:00 committed by Ulf Hansson
parent b638602eae
commit be17355a74
1 changed files with 27 additions and 7 deletions
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34
drivers/mmc/host/sdhci-pci-core.c
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@ -453,6 +453,7 @@ static const struct sdhci_pci_fixes sdhci_intel_pch_sdio = {
enum {
INTEL_DSM_FNS = 0,
INTEL_DSM_V18_SWITCH = 3,
INTEL_DSM_V33_SWITCH = 4,
INTEL_DSM_DRV_STRENGTH = 9,
INTEL_DSM_D3_RETUNE = 10,
};
@ -620,17 +621,37 @@ 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)
static int intel_start_signal_voltage_switch(struct mmc_host *mmc,
struct mmc_ios *ios)
{
struct device *dev = mmc_dev(mmc);
struct sdhci_host *host = mmc_priv(mmc);
struct sdhci_pci_slot *slot = sdhci_priv(host);
struct intel_host *intel_host = sdhci_pci_priv(slot);
struct device *dev = &slot->chip->pdev->dev;
unsigned int fn;
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);
err = sdhci_start_signal_voltage_switch(mmc, ios);
if (err)
return err;
switch (ios->signal_voltage) {
case MMC_SIGNAL_VOLTAGE_330:
fn = INTEL_DSM_V33_SWITCH;
break;
case MMC_SIGNAL_VOLTAGE_180:
fn = INTEL_DSM_V18_SWITCH;
break;
default:
return 0;
}
err = intel_dsm(intel_host, dev, fn, &result);
pr_debug("%s: %s DSM fn %u error %d result %u\n",
mmc_hostname(mmc), __func__, fn, err, result);
return 0;
}
static const struct sdhci_ops sdhci_intel_byt_ops = {
@ -641,7 +662,6 @@ 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 const struct sdhci_ops sdhci_intel_glk_ops = {
@ -652,7 +672,6 @@ static const struct sdhci_ops sdhci_intel_glk_ops = {
.reset = sdhci_reset,
.set_uhs_signaling = sdhci_set_uhs_signaling,
.hw_reset = sdhci_pci_hw_reset,
.voltage_switch = sdhci_intel_voltage_switch,
.irq = sdhci_cqhci_irq,
};
@ -691,6 +710,7 @@ static void byt_probe_slot(struct sdhci_pci_slot *slot)
byt_read_dsm(slot);
ops->execute_tuning = intel_execute_tuning;
ops->start_signal_voltage_switch = intel_start_signal_voltage_switch;
}
static int byt_emmc_probe_slot(struct sdhci_pci_slot *slot)