90f0d91426
Changes:
- Add support for tablet-mode switch on the Surface Pro 9.
- Add workaround for shutdown issue on the Surface Pro 9.
Links:
- kernel: cdc452b5b5
90 lines
3.3 KiB
Diff
90 lines
3.3 KiB
Diff
From 7dd556a6570b366084aa07918ac864d10f6f9982 Mon Sep 17 00:00:00 2001
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From: Maximilian Luz <luzmaximilian@gmail.com>
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Date: Sun, 19 Feb 2023 22:12:24 +0100
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Subject: [PATCH] PCI: Add quirk to prevent calling shutdown mehtod
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Work around buggy EFI firmware: On some Microsoft Surface devices
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(Surface Pro 9 and Surface Laptop 5) the EFI ResetSystem call with
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EFI_RESET_SHUTDOWN doesn't function properly. Instead of shutting the
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system down, it returns and the system stays on.
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It turns out that this only happens after PCI shutdown callbacks ran for
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specific devices. Excluding those devices from the shutdown process
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makes the ResetSystem call work as expected.
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TODO: Maybe we can find a better way or the root cause of this?
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Not-Signed-off-by: Maximilian Luz <luzmaximilian@gmail.com>
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Patchset: surface-shutdown
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---
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drivers/pci/pci-driver.c | 3 +++
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drivers/pci/quirks.c | 28 ++++++++++++++++++++++++++++
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include/linux/pci.h | 1 +
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3 files changed, 32 insertions(+)
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diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
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index 107d77f3c846..4c64424a794f 100644
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--- a/drivers/pci/pci-driver.c
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+++ b/drivers/pci/pci-driver.c
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@@ -507,6 +507,9 @@ static void pci_device_shutdown(struct device *dev)
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struct pci_dev *pci_dev = to_pci_dev(dev);
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struct pci_driver *drv = pci_dev->driver;
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+ if (pci_dev->no_shutdown)
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+ return;
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+
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pm_runtime_resume(dev);
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if (drv && drv->shutdown)
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diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
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index 285acc4aaccc..c562fdeaf7f0 100644
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--- a/drivers/pci/quirks.c
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+++ b/drivers/pci/quirks.c
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@@ -5992,3 +5992,31 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x9a2d, dpc_log_size);
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DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x9a2f, dpc_log_size);
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DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x9a31, dpc_log_size);
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#endif
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+
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+static const struct dmi_system_id no_shutdown_dmi_table[] = {
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+ /*
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+ * Systems on which some devices should not be touched during shutdown.
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+ */
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+ {
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+ .ident = "Microsoft Surface Pro 9",
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+ .matches = {
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+ DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
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+ DMI_MATCH(DMI_PRODUCT_NAME, "Surface Pro 9"),
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+ },
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+ },
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+ {}
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+};
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+
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+static void quirk_no_shutdown(struct pci_dev *dev)
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+{
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+ if (!dmi_check_system(no_shutdown_dmi_table))
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+ return;
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+
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+ dev->no_shutdown = 1;
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+ pci_info(dev, "disabling shutdown ops for [%04x:%04x]\n",
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+ dev->vendor, dev->device);
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+}
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+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x46a8, quirk_no_shutdown); // GPU
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+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x462f, quirk_no_shutdown); // Thunderbolt 4 PCI Express Root Port
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+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x461f, quirk_no_shutdown); // Thunderbolt 4 PCI Express Root Port
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+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x461e, quirk_no_shutdown); // Thunderbolt 4 USB Controller
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diff --git a/include/linux/pci.h b/include/linux/pci.h
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index 2bda4a4e47e8..1186210ae007 100644
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--- a/include/linux/pci.h
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+++ b/include/linux/pci.h
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@@ -462,6 +462,7 @@ struct pci_dev {
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unsigned int no_vf_scan:1; /* Don't scan for VFs after IOV enablement */
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unsigned int no_command_memory:1; /* No PCI_COMMAND_MEMORY */
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unsigned int rom_bar_overlap:1; /* ROM BAR disable broken */
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+ unsigned int no_shutdown:1; /* Do not touch device on shutdown */
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pci_dev_flags_t dev_flags;
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atomic_t enable_cnt; /* pci_enable_device has been called */
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--
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2.39.2
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