diff options
| author | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2018-01-11 15:51:58 +0200 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2018-01-11 15:51:09 +0100 |
| commit | 2a609abe71ca59e4bd7139e161eaca2144ae6f2e (patch) | |
| tree | 2e245461b39e3d0c42baa004b477ad7be4badcef /drivers/mmc | |
| parent | b8155d3ff3ebbdfa10c6ec6c5f04b263670727e6 (diff) | |
| download | lwn-2a609abe71ca59e4bd7139e161eaca2144ae6f2e.tar.gz lwn-2a609abe71ca59e4bd7139e161eaca2144ae6f2e.zip | |
sdhci: Advertise 2.0v supply on SDIO host controller
On Intel Edison the Broadcom Wi-Fi card, which is connected to SDIO,
requires 2.0v, while the host, according to Intel Merrifield TRM,
supports 1.8v supply only.
The card announces itself as
mmc2: new ultra high speed DDR50 SDIO card at address 0001
Introduce a custom OCR mask for SDIO host controller on Intel Merrifield
and add a special case to sdhci_set_power_noreg() to override 2.0v supply
by enforcing 1.8v power choice.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/host/sdhci-pci-core.c | 2 | ||||
| -rw-r--r-- | drivers/mmc/host/sdhci.c | 7 |
2 files changed, 9 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci-pci-core.c b/drivers/mmc/host/sdhci-pci-core.c index c5b229b46314..00fa7a36b336 100644 --- a/drivers/mmc/host/sdhci-pci-core.c +++ b/drivers/mmc/host/sdhci-pci-core.c @@ -930,6 +930,8 @@ static int intel_mrfld_mmc_probe_slot(struct sdhci_pci_slot *slot) slot->host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V; break; case INTEL_MRFLD_SDIO: + /* Advertise 2.0v for compatibility with the SDIO card's OCR */ + slot->host->ocr_mask = MMC_VDD_20_21 | MMC_VDD_165_195; slot->host->mmc->caps |= MMC_CAP_NONREMOVABLE | MMC_CAP_POWER_OFF_CARD; break; diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index e9290a3439d5..80b1a59bc3c5 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -1434,6 +1434,13 @@ void sdhci_set_power_noreg(struct sdhci_host *host, unsigned char mode, if (mode != MMC_POWER_OFF) { switch (1 << vdd) { case MMC_VDD_165_195: + /* + * Without a regulator, SDHCI does not support 2.0v + * so we only get here if the driver deliberately + * added the 2.0v range to ocr_avail. Map it to 1.8v + * for the purpose of turning on the power. + */ + case MMC_VDD_20_21: pwr = SDHCI_POWER_180; break; case MMC_VDD_29_30: |