Patch "sdhci: Advertise 2.0v supply on SDIO host controller" has been added to the 4.9-stable tree

[<gregkh@linuxfoundation.org>]

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 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     sdhci-advertise-2.0v-supply-on-sdio-host-controller.patch
and it can be found in the queue-4.9 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 17:09:24 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
@@ -492,6 +492,8 @@ 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
@@ -1404,6 +1404,13 @@ 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-4.9/gpio-crystalcove-do-not-write-regular-gpio-registers-for-virtual-gpios.patch
queue-4.9/sdhci-advertise-2.0v-supply-on-sdio-host-controller.patch