This is a note to let you know that I've just added the patch titled
sdhci: Advertise 2.0v supply on SDIO host controller
to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: sdhci-advertise-2.0v-supply-on-sdio-host-controller.patch and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From foo@baz Mon Apr 9 13:58:16 CEST 2018
From: Andy Shevchenko andriy.shevchenko@linux.intel.com Date: Thu, 11 Jan 2018 15:51:58 +0200 Subject: sdhci: Advertise 2.0v supply on SDIO host controller
From: Andy Shevchenko andriy.shevchenko@linux.intel.com
[ Upstream commit 2a609abe71ca59e4bd7139e161eaca2144ae6f2e ]
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 Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/mmc/host/sdhci-pci-core.c | 2 ++ drivers/mmc/host/sdhci.c | 7 +++++++ 2 files changed, 9 insertions(+)
--- a/drivers/mmc/host/sdhci-pci-core.c +++ b/drivers/mmc/host/sdhci-pci-core.c @@ -806,6 +806,8 @@ static int intel_mrfld_mmc_probe_slot(st 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; --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -1470,6 +1470,13 @@ void sdhci_set_power_noreg(struct sdhci_ 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:
Patches currently in stable-queue which might be from andriy.shevchenko@linux.intel.com are
queue-4.14/sdhci-advertise-2.0v-supply-on-sdio-host-controller.patch