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mmc: sdhci-acpi: Fix voltage switch for some Intel host controllers 

Some Intel host controllers use an ACPI device-specific method to ensure
correct voltage switching. Fix voltage switch for those, by adding a call
to the 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 2017-10-19 13:41:46 +03:00 committed by Ulf Hansson
parent f07b7952df
commit 1c451c139e
1 changed files with 108 additions and 0 deletions
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108
drivers/mmc/host/sdhci-acpi.c
View File

@ -96,6 +96,105 @@ static inline bool sdhci_acpi_flag(struct sdhci_acpi_host *c, unsigned int flag)
return c->slot && (c->slot->flags & flag);
}
enum {
INTEL_DSM_FNS = 0,
INTEL_DSM_V18_SWITCH = 3,
INTEL_DSM_V33_SWITCH = 4,
};
struct intel_host {
u32 dsm_fns;
};
static const guid_t intel_dsm_guid =
GUID_INIT(0xF6C13EA5, 0x65CD, 0x461F,
0xAB, 0x7A, 0x29, 0xF7, 0xE8, 0xD5, 0xBD, 0x61);
static int __intel_dsm(struct intel_host *intel_host, struct device *dev,
unsigned int fn, u32 *result)
{
union acpi_object *obj;
int err = 0;
obj = acpi_evaluate_dsm(ACPI_HANDLE(dev), &intel_dsm_guid, 0, fn, NULL);
if (!obj)
return -EOPNOTSUPP;
if (obj->type == ACPI_TYPE_INTEGER) {
*result = obj->integer.value;
} else if (obj->type == ACPI_TYPE_BUFFER && obj->buffer.length > 0) {
size_t len = min_t(size_t, obj->buffer.length, 4);
*result = 0;
memcpy(result, obj->buffer.pointer, len);
} else {
dev_err(dev, "%s DSM fn %u obj->type %d obj->buffer.length %d\n",
__func__, fn, obj->type, obj->buffer.length);
err = -EINVAL;
}
ACPI_FREE(obj);
return err;
}
static int intel_dsm(struct intel_host *intel_host, struct device *dev,
unsigned int fn, u32 *result)
{
if (fn > 31 || !(intel_host->dsm_fns & (1 << fn)))
return -EOPNOTSUPP;
return __intel_dsm(intel_host, dev, fn, result);
}
static void intel_dsm_init(struct intel_host *intel_host, struct device *dev,
struct mmc_host *mmc)
{
int err;
err = __intel_dsm(intel_host, dev, INTEL_DSM_FNS, &intel_host->dsm_fns);
if (err) {
pr_debug("%s: DSM not supported, error %d\n",
mmc_hostname(mmc), err);
return;
}
pr_debug("%s: DSM function mask %#x\n",
mmc_hostname(mmc), intel_host->dsm_fns);
}
static int intel_start_signal_voltage_switch(struct mmc_host *mmc,
struct mmc_ios *ios)
{
struct device *dev = mmc_dev(mmc);
struct sdhci_acpi_host *c = dev_get_drvdata(dev);
struct intel_host *intel_host = sdhci_acpi_priv(c);
unsigned int fn;
u32 result = 0;
int err;
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 void sdhci_acpi_int_hw_reset(struct sdhci_host *host)
{
u8 reg;
@ -280,6 +379,7 @@ static int intel_probe_slot(struct platform_device *pdev, const char *hid,
const char *uid)
{
struct sdhci_acpi_host *c = platform_get_drvdata(pdev);
struct intel_host *intel_host = sdhci_acpi_priv(c);
struct sdhci_host *host = c->host;
if (hid && uid && !strcmp(hid, "80860F14") && !strcmp(uid, "1") &&
@ -290,6 +390,11 @@ static int intel_probe_slot(struct platform_device *pdev, const char *hid,
if (hid && !strcmp(hid, "80865ACA"))
host->mmc_host_ops.get_cd = bxt_get_cd;
intel_dsm_init(intel_host, &pdev->dev, host->mmc);
host->mmc_host_ops.start_signal_voltage_switch =
intel_start_signal_voltage_switch;
return 0;
}
@ -304,6 +409,7 @@ static const struct sdhci_acpi_slot sdhci_acpi_slot_int_emmc = {
SDHCI_QUIRK2_STOP_WITH_TC |
SDHCI_QUIRK2_CAPS_BIT63_FOR_HS400,
.probe_slot = intel_probe_slot,
.priv_size = sizeof(struct intel_host),
};
static const struct sdhci_acpi_slot sdhci_acpi_slot_int_sdio = {
@ -315,6 +421,7 @@ static const struct sdhci_acpi_slot sdhci_acpi_slot_int_sdio = {
.flags = SDHCI_ACPI_RUNTIME_PM,
.pm_caps = MMC_PM_KEEP_POWER,
.probe_slot = intel_probe_slot,
.priv_size = sizeof(struct intel_host),
};
static const struct sdhci_acpi_slot sdhci_acpi_slot_int_sd = {
@ -325,6 +432,7 @@ static const struct sdhci_acpi_slot sdhci_acpi_slot_int_sd = {
SDHCI_QUIRK2_STOP_WITH_TC,
.caps = MMC_CAP_WAIT_WHILE_BUSY | MMC_CAP_AGGRESSIVE_PM,
.probe_slot = intel_probe_slot,
.priv_size = sizeof(struct intel_host),
};
static const struct sdhci_acpi_slot sdhci_acpi_slot_qcom_sd_3v = {