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Subject[PATCH 5.1 047/128] mmc: sdhci-pci: Fix BYT OCP setting
Date
From: Adrian Hunter <adrian.hunter@intel.com>

commit 0a49a619e7e1aeb3f5f5511ca59314423c83dae2 upstream.

Some time ago, a fix was done for the sdhci-acpi driver, refer
commit 6e1c7d6103fe ("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: Adrian Hunter <adrian.hunter@intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/mmc/host/Kconfig | 1
drivers/mmc/host/sdhci-pci-core.c | 96 ++++++++++++++++++++++++++++++++++++++
2 files changed, 97 insertions(+)

--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -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.
--- a/drivers/mmc/host/sdhci-pci-core.c
+++ b/drivers/mmc/host/sdhci-pci-core.c
@@ -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 sdhc
.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_

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 sdhc
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 sdhc
};

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 sdhc
};

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 sdhc
};

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 |

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