mirrors
/
linux-stable
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
1
0
Fork 0
Code Issues Releases Wiki Activity

mmc: sdhci-acpi: Avoid broken UHS transfer modes on Intel CHT 

Intel DSM function 8 has been used to identify transfer modes that are not
working on some CHT boards. Add support for that.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Tested-by: Carlo Caione <carlo@endlessm.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Adrian Hunter 2017-12-08 15:08:18 +02:00 committed by Ulf Hansson
parent 0cc1a0f451
commit 0acccf4141
1 changed files with 34 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
drivers/mmc/host/sdhci-acpi.c
View File

@ -97,14 +97,21 @@ static inline bool sdhci_acpi_flag(struct sdhci_acpi_host *c, unsigned int flag)
return c->slot && (c->slot->flags & flag);
}
#define INTEL_DSM_HS_CAPS_SDR25 BIT(0)
#define INTEL_DSM_HS_CAPS_DDR50 BIT(1)
#define INTEL_DSM_HS_CAPS_SDR50 BIT(2)
#define INTEL_DSM_HS_CAPS_SDR104 BIT(3)
enum {
INTEL_DSM_FNS = 0,
INTEL_DSM_V18_SWITCH = 3,
INTEL_DSM_V33_SWITCH = 4,
INTEL_DSM_HS_CAPS = 8,
};
struct intel_host {
u32 dsm_fns;
u32 hs_caps;
};
static const guid_t intel_dsm_guid =
@ -153,6 +160,8 @@ static void intel_dsm_init(struct intel_host *intel_host, struct device *dev,
{
int err;
intel_host->hs_caps = ~0;
err = __intel_dsm(intel_host, dev, INTEL_DSM_FNS, &intel_host->dsm_fns);
if (err) {
pr_debug("%s: DSM not supported, error %d\n",
@ -162,6 +171,8 @@ static void intel_dsm_init(struct intel_host *intel_host, struct device *dev,
pr_debug("%s: DSM function mask %#x\n",
mmc_hostname(mmc), intel_host->dsm_fns);
intel_dsm(intel_host, dev, INTEL_DSM_HS_CAPS, &intel_host->hs_caps);
}
static int intel_start_signal_voltage_switch(struct mmc_host *mmc,
@ -399,6 +410,26 @@ static int intel_probe_slot(struct platform_device *pdev, const char *hid,
return 0;
}
static int intel_setup_host(struct platform_device *pdev)
{
struct sdhci_acpi_host *c = platform_get_drvdata(pdev);
struct intel_host *intel_host = sdhci_acpi_priv(c);
if (!(intel_host->hs_caps & INTEL_DSM_HS_CAPS_SDR25))
c->host->mmc->caps &= ~MMC_CAP_UHS_SDR25;
if (!(intel_host->hs_caps & INTEL_DSM_HS_CAPS_SDR50))
c->host->mmc->caps &= ~MMC_CAP_UHS_SDR50;
if (!(intel_host->hs_caps & INTEL_DSM_HS_CAPS_DDR50))
c->host->mmc->caps &= ~MMC_CAP_UHS_DDR50;
if (!(intel_host->hs_caps & INTEL_DSM_HS_CAPS_SDR104))
c->host->mmc->caps &= ~MMC_CAP_UHS_SDR104;
return 0;
}
static const struct sdhci_acpi_slot sdhci_acpi_slot_int_emmc = {
.chip = &sdhci_acpi_chip_int,
.caps = MMC_CAP_8_BIT_DATA | MMC_CAP_NONREMOVABLE |
@ -410,6 +441,7 @@ 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,
.setup_host = intel_setup_host,
.priv_size = sizeof(struct intel_host),
};
@ -422,6 +454,7 @@ 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,
.setup_host = intel_setup_host,
.priv_size = sizeof(struct intel_host),
};
@ -433,6 +466,7 @@ 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,
.setup_host = intel_setup_host,
.priv_size = sizeof(struct intel_host),
};