linux-kernel - [PATCH 01/10] mmc: sdhci: Add quirk SDHCI_QUIRK2_SET_BUS

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Date:   Fri,  6 Mar 2020 11:38:46 +0100
From:   Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
To:     devicetree@...r.kernel.org, bcm-kernel-feedback-list@...adcom.com,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-mmc@...r.kernel.org,
        Adrian Hunter <adrian.hunter@...el.com>
Cc:     ulf.hansson@...aro.org, f.fainelli@...il.com, phil@...pberrypi.org,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 01/10] mmc: sdhci: Add quirk SDHCI_QUIRK2_SET_BUS_VOLTAGE

Adds quirk for controllers whose bus power select register has to be set
even when powering SD cards from a regulator.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
---
 drivers/mmc/host/sdhci.c | 5 +++++
 drivers/mmc/host/sdhci.h | 2 ++
 2 files changed, 7 insertions(+)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index c59566363a42..c7fd87447457 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1920,6 +1920,11 @@ static void sdhci_set_power_reg(struct sdhci_host *host, unsigned char mode,
 
 	mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
 
+	if (host->quirks2 & SDHCI_QUIRK2_SET_BUS_VOLTAGE) {
+		sdhci_set_power_noreg(host, mode, vdd);
+		return;
+	}
+
 	if (mode != MMC_POWER_OFF)
 		sdhci_writeb(host, SDHCI_POWER_ON, SDHCI_POWER_CONTROL);
 	else
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index cac2d97782e6..9531a4e5b148 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -484,6 +484,8 @@ struct sdhci_host {
  * block count.
  */
 #define SDHCI_QUIRK2_USE_32BIT_BLK_CNT			(1<<18)
+/* Set bus voltage even when powering from an external regulator */
+#define SDHCI_QUIRK2_SET_BUS_VOLTAGE			(1<<19)
 
 	int irq;		/* Device IRQ */
 	void __iomem *ioaddr;	/* Mapped address */
-- 
2.25.1