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Commit 0a49a619 authored by Adrian Hunter's avatar Adrian Hunter Committed by Ulf Hansson
Browse files

mmc: sdhci-pci: Fix BYT OCP setting 



Some time ago, a fix was done for the sdhci-acpi driver, refer
commit 6e1c7d61 ("mmc: sdhci-acpi: Reduce Baytrail eMMC/SD/SDIO
hangs"). The same issue was not expected to affect the sdhci-pci driver,
but there have been reports to the contrary, so make the same hardware
setting change.

This patch applies to v5.0+ but before that backports will be required.

Signed-off-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 34368217

drivers/mmc/host/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -92,6 +92,7 @@ config MMC_SDHCI_PCI 
	tristate "SDHCI support on PCI bus"

	depends on MMC_SDHCI && PCI

	select MMC_CQHCI

	select IOSF_MBI if X86

	help

	  This selects the PCI Secure Digital Host Controller Interface.

	  Most controllers found today are PCI devices.

drivers/mmc/host/sdhci-pci-core.c

+96 −0
Original line number Diff line number Diff line
@@ -31,6 +31,10 @@ 
#include <linux/mmc/sdhci-pci-data.h>

#include <linux/acpi.h>



#ifdef CONFIG_X86

#include <asm/iosf_mbi.h>

#endif



#include "cqhci.h"



#include "sdhci.h"
@@ -451,6 +455,50 @@ static const struct sdhci_pci_fixes sdhci_intel_pch_sdio = { 
	.probe_slot	= pch_hc_probe_slot,

};



#ifdef CONFIG_X86



#define BYT_IOSF_SCCEP			0x63

#define BYT_IOSF_OCP_NETCTRL0		0x1078

#define BYT_IOSF_OCP_TIMEOUT_BASE	GENMASK(10, 8)



static void byt_ocp_setting(struct pci_dev *pdev)

{

	u32 val = 0;



	if (pdev->device != PCI_DEVICE_ID_INTEL_BYT_EMMC &&

	    pdev->device != PCI_DEVICE_ID_INTEL_BYT_SDIO &&

	    pdev->device != PCI_DEVICE_ID_INTEL_BYT_SD &&

	    pdev->device != PCI_DEVICE_ID_INTEL_BYT_EMMC2)

		return;



	if (iosf_mbi_read(BYT_IOSF_SCCEP, MBI_CR_READ, BYT_IOSF_OCP_NETCTRL0,

			  &val)) {

		dev_err(&pdev->dev, "%s read error\n", __func__);

		return;

	}



	if (!(val & BYT_IOSF_OCP_TIMEOUT_BASE))

		return;



	val &= ~BYT_IOSF_OCP_TIMEOUT_BASE;



	if (iosf_mbi_write(BYT_IOSF_SCCEP, MBI_CR_WRITE, BYT_IOSF_OCP_NETCTRL0,

			   val)) {

		dev_err(&pdev->dev, "%s write error\n", __func__);

		return;

	}



	dev_dbg(&pdev->dev, "%s completed\n", __func__);

}



#else



static inline void byt_ocp_setting(struct pci_dev *pdev)

{

}



#endif



enum {

	INTEL_DSM_FNS		=  0,

	INTEL_DSM_V18_SWITCH	=  3,
@@ -715,6 +763,8 @@ static void byt_probe_slot(struct sdhci_pci_slot *slot) 


	byt_read_dsm(slot);



	byt_ocp_setting(slot->chip->pdev);



	ops->execute_tuning = intel_execute_tuning;

	ops->start_signal_voltage_switch = intel_start_signal_voltage_switch;
@@ -938,7 +988,35 @@ static int byt_sd_probe_slot(struct sdhci_pci_slot *slot) 
	return 0;

}



#ifdef CONFIG_PM_SLEEP



static int byt_resume(struct sdhci_pci_chip *chip)

{

	byt_ocp_setting(chip->pdev);



	return sdhci_pci_resume_host(chip);

}



#endif



#ifdef CONFIG_PM



static int byt_runtime_resume(struct sdhci_pci_chip *chip)

{

	byt_ocp_setting(chip->pdev);



	return sdhci_pci_runtime_resume_host(chip);

}



#endif



static const struct sdhci_pci_fixes sdhci_intel_byt_emmc = {

#ifdef CONFIG_PM_SLEEP

	.resume		= byt_resume,

#endif

#ifdef CONFIG_PM

	.runtime_resume	= byt_runtime_resume,

#endif

	.allow_runtime_pm = true,

	.probe_slot	= byt_emmc_probe_slot,

	.quirks		= SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC |
@@ -972,6 +1050,12 @@ static const struct sdhci_pci_fixes sdhci_intel_glk_emmc = { 
};



static const struct sdhci_pci_fixes sdhci_ni_byt_sdio = {

#ifdef CONFIG_PM_SLEEP

	.resume		= byt_resume,

#endif

#ifdef CONFIG_PM

	.runtime_resume	= byt_runtime_resume,

#endif

	.quirks		= SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC |

			  SDHCI_QUIRK_NO_LED,

	.quirks2	= SDHCI_QUIRK2_HOST_OFF_CARD_ON |
@@ -983,6 +1067,12 @@ static const struct sdhci_pci_fixes sdhci_ni_byt_sdio = { 
};



static const struct sdhci_pci_fixes sdhci_intel_byt_sdio = {

#ifdef CONFIG_PM_SLEEP

	.resume		= byt_resume,

#endif

#ifdef CONFIG_PM

	.runtime_resume	= byt_runtime_resume,

#endif

	.quirks		= SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC |

			  SDHCI_QUIRK_NO_LED,

	.quirks2	= SDHCI_QUIRK2_HOST_OFF_CARD_ON |
@@ -994,6 +1084,12 @@ static const struct sdhci_pci_fixes sdhci_intel_byt_sdio = { 
};



static const struct sdhci_pci_fixes sdhci_intel_byt_sd = {

#ifdef CONFIG_PM_SLEEP

	.resume		= byt_resume,

#endif

#ifdef CONFIG_PM

	.runtime_resume	= byt_runtime_resume,

#endif

	.quirks		= SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC |

			  SDHCI_QUIRK_NO_LED,

	.quirks2	= SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON |