mmc: sdhci-acpi: add support for eMMC hardware reset for HID 80860F14 (b04fa064) · Commits · e / devices / android_kernel_teracube_emerald

drivers/mmc/host/sdhci-acpi.c

+27 −1

Original line number	Original line	Diff line number	Diff line
	@@ -37,6 +37,7 @@
	#include <linux/acpi_gpio.h>		#include <linux/acpi_gpio.h>
	#include <linux/pm.h>		#include <linux/pm.h>
	#include <linux/pm_runtime.h>		#include <linux/pm_runtime.h>
			#include <linux/delay.h>

	#include <linux/mmc/host.h>		#include <linux/mmc/host.h>
	#include <linux/mmc/pm.h>		#include <linux/mmc/pm.h>
	@@ -85,12 +86,37 @@ static int sdhci_acpi_enable_dma(struct sdhci_host *host)
	return 0;		return 0;
	}		}

			static void sdhci_acpi_int_hw_reset(struct sdhci_host *host)
			{
			u8 reg;

			reg = sdhci_readb(host, SDHCI_POWER_CONTROL);
			reg \|= 0x10;
			sdhci_writeb(host, reg, SDHCI_POWER_CONTROL);
			/* For eMMC, minimum is 1us but give it 9us for good measure */
			udelay(9);
			reg &= ~0x10;
			sdhci_writeb(host, reg, SDHCI_POWER_CONTROL);
			/* For eMMC, minimum is 200us but give it 300us for good measure */
			usleep_range(300, 1000);
			}

	static const struct sdhci_ops sdhci_acpi_ops_dflt = {		static const struct sdhci_ops sdhci_acpi_ops_dflt = {
	.enable_dma = sdhci_acpi_enable_dma,		.enable_dma = sdhci_acpi_enable_dma,
	};		};

			static const struct sdhci_ops sdhci_acpi_ops_int = {
			.enable_dma = sdhci_acpi_enable_dma,
			.hw_reset = sdhci_acpi_int_hw_reset,
			};

			static const struct sdhci_acpi_chip sdhci_acpi_chip_int = {
			.ops = &sdhci_acpi_ops_int,
			};

	static const struct sdhci_acpi_slot sdhci_acpi_slot_int_emmc = {		static const struct sdhci_acpi_slot sdhci_acpi_slot_int_emmc = {
	.caps = MMC_CAP_8_BIT_DATA \| MMC_CAP_NONREMOVABLE,		.chip = &sdhci_acpi_chip_int,
			.caps = MMC_CAP_8_BIT_DATA \| MMC_CAP_NONREMOVABLE \| MMC_CAP_HW_RESET,
	.caps2 = MMC_CAP2_HC_ERASE_SZ,		.caps2 = MMC_CAP2_HC_ERASE_SZ,
	.flags = SDHCI_ACPI_RUNTIME_PM,		.flags = SDHCI_ACPI_RUNTIME_PM,
	};		};