142 lines
4.2 KiB
Diff
142 lines
4.2 KiB
Diff
From 93c501a65e23aba07389ad95b7e31834ae6d4722 Mon Sep 17 00:00:00 2001
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From: Adrian Hunter <adrian.hunter@intel.com>
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Date: Wed, 21 Jun 2017 15:08:39 +0300
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Subject: [PATCH 14/16] mmc: sdhci-acpi: Workaround conflict with PCI wifi on
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GPD Win handheld
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GPDwin uses PCI wifi which conflicts with SDIO's use of
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acpi_device_fix_up_power() on child device nodes. Specifically
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acpi_device_fix_up_power() causes the wifi module to get turned off.
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Identifying GPDwin is problematic, but since SDIO is only used for wifi,
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the presence of the PCI wifi card in the expected slot with an ACPI
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companion node, is used to indicate that acpi_device_fix_up_power() should
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be avoided.
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[labbott@redhat.com: Rebased for Fedora]
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Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
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Acked-by: Hans de Goede <hdegoede@redhat.com>
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Tested-by: Hans de Goede <hdegoede@redhat.com>
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Cc: stable@vger.kernel.org
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---
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drivers/mmc/host/sdhci-acpi.c | 70 +++++++++++++++++++++++++++++++++++++++----
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1 file changed, 64 insertions(+), 6 deletions(-)
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diff --git a/drivers/mmc/host/sdhci-acpi.c b/drivers/mmc/host/sdhci-acpi.c
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index cf66a3d..ac678e9 100644
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--- a/drivers/mmc/host/sdhci-acpi.c
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+++ b/drivers/mmc/host/sdhci-acpi.c
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@@ -45,6 +45,7 @@
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#include <asm/cpu_device_id.h>
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#include <asm/intel-family.h>
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#include <asm/iosf_mbi.h>
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+#include <linux/pci.h>
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#endif
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#include "sdhci.h"
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@@ -134,6 +135,16 @@ static bool sdhci_acpi_byt(void)
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return x86_match_cpu(byt);
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}
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+static bool sdhci_acpi_cht(void)
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+{
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+ static const struct x86_cpu_id cht[] = {
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+ { X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_AIRMONT },
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+ {}
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+ };
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+
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+ return x86_match_cpu(cht);
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+}
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+
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#define BYT_IOSF_SCCEP 0x63
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#define BYT_IOSF_OCP_NETCTRL0 0x1078
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#define BYT_IOSF_OCP_TIMEOUT_BASE GENMASK(10, 8)
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@@ -178,6 +189,45 @@ static bool sdhci_acpi_byt_defer(struct device *dev)
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return false;
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}
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+static bool sdhci_acpi_cht_pci_wifi(unsigned int vendor, unsigned int device,
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+ unsigned int slot, unsigned int parent_slot)
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+{
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+ struct pci_dev *dev, *parent, *from = NULL;
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+
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+ while (1) {
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+ dev = pci_get_device(vendor, device, from);
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+ pci_dev_put(from);
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+ if (!dev)
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+ break;
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+ parent = pci_upstream_bridge(dev);
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+ if (ACPI_COMPANION(&dev->dev) && PCI_SLOT(dev->devfn) == slot &&
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+ parent && PCI_SLOT(parent->devfn) == parent_slot &&
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+ !pci_upstream_bridge(parent)) {
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+ pci_dev_put(dev);
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+ return true;
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+ }
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+ from = dev;
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+ }
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+
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+ return false;
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+}
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+
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+/*
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+ * GPDwin uses PCI wifi which conflicts with SDIO's use of
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+ * acpi_device_fix_up_power() on child device nodes. Identifying GPDwin is
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+ * problematic, but since SDIO is only used for wifi, the presence of the PCI
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+ * wifi card in the expected slot with an ACPI companion node, is used to
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+ * indicate that acpi_device_fix_up_power() should be avoided.
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+ */
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+static inline bool sdhci_acpi_no_fixup_child_power(const char *hid,
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+ const char *uid)
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+{
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+ return sdhci_acpi_cht() &&
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+ !strcmp(hid, "80860F14") &&
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+ !strcmp(uid, "2") &&
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+ sdhci_acpi_cht_pci_wifi(0x14e4, 0x43ec, 0, 28);
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+}
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+
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#else
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static inline void sdhci_acpi_byt_setting(struct device *dev)
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@@ -189,6 +239,12 @@ static inline bool sdhci_acpi_byt_defer(struct device *dev)
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return false;
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}
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+static inline bool sdhci_acpi_no_fixup_child_power(const char *hid,
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+ const char *uid)
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+{
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+ return false;
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+}
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+
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#endif
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static int bxt_get_cd(struct mmc_host *mmc)
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@@ -389,18 +445,20 @@ static int sdhci_acpi_probe(struct platform_device *pdev)
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if (acpi_bus_get_device(handle, &device))
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return -ENODEV;
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+ hid = acpi_device_hid(device);
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+ uid = device->pnp.unique_id;
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+
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/* Power on the SDHCI controller and its children */
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acpi_device_fix_up_power(device);
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- list_for_each_entry(child, &device->children, node)
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- if (child->status.present && child->status.enabled)
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- acpi_device_fix_up_power(child);
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+ if (!sdhci_acpi_no_fixup_child_power(hid, uid)) {
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+ list_for_each_entry(child, &device->children, node)
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+ if (child->status.present && child->status.enabled)
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+ acpi_device_fix_up_power(child);
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+ }
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if (sdhci_acpi_byt_defer(dev))
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return -EPROBE_DEFER;
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- hid = acpi_device_hid(device);
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- uid = device->pnp.unique_id;
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-
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iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!iomem)
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return -ENOMEM;
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--
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2.7.5
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