diff options
| author | Adrian Hunter <adrian.hunter@intel.com> | 2018-04-13 16:18:27 +0300 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2018-05-02 15:08:47 +0200 |
| commit | be17355a7472e8466fdb29dca09eaa6a9ab6468d (patch) | |
| tree | 73e3a4b2d6781fa324c28a39c4240d99df7b452f /drivers/mmc/host/sdhci-pci-core.c | |
| parent | b638602eae7851918d2abed823ab3bed0c269e59 (diff) | |
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>
Diffstat (limited to 'drivers/mmc/host/sdhci-pci-core.c')
| -rw-r--r-- | drivers/mmc/host/sdhci-pci-core.c | 34 |
1 files changed, 27 insertions, 7 deletions
diff --git a/drivers/mmc/host/sdhci-pci-core.c b/drivers/mmc/host/sdhci-pci-core.c index 9dfbd7f7e9fa..77dd3521daae 100644 --- a/drivers/mmc/host/sdhci-pci-core.c +++ b/drivers/mmc/host/sdhci-pci-core.c @@ -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) |