On 11/01/18 15:51, Andy Shevchenko wrote:
> 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@xxxxxxxxxxxxxxx>
Acked-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
> ---
> - address Ulf's comment
> drivers/mmc/host/sdhci-pci-core.c | 2 ++
> drivers/mmc/host/sdhci.c | 7 +++++++
> 2 files changed, 9 insertions(+)
>
> diff --git a/drivers/mmc/host/sdhci-pci-core.c b/drivers/mmc/host/sdhci-pci-core.c
> index 3e4f04fd5175..bcfb5dc0d85e 100644
> --- a/drivers/mmc/host/sdhci-pci-core.c
> +++ b/drivers/mmc/host/sdhci-pci-core.c
> @@ -778,6 +778,8 @@ 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:
>
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