Patch "sdhci: Advertise 2.0v supply on SDIO host controller" has been added to the 4.14-stable tree

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;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-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Andy Shevchenko <[email protected]>
Date: Thu, 11 Jan 2018 15:51:58 +0200
Subject: sdhci: Advertise 2.0v supply on SDIO host controller

From: Andy Shevchenko <[email protected]>

[ 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.

---
 drivers/mmc/host/sdhci-pci-core.c |    2 ++
 drivers/mmc/host/sdhci.c          |    7 +++++++
 2 files changed, 9 insertions(+)

@@ -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;

@@ -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 [email protected] are

queue-4.14/sdhci-advertise-2.0v-supply-on-sdio-host-controller.patch