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From: Hans de Goede <hdegoede@redhat.com>
To: Bjorn Helgaas <bhelgaas@google.com>
Cc: Hans de Goede <hdegoede@redhat.com>,
	linuxkernelml@undead.fr, linux-acpi@vger.kernel.org,
	linux-pci@vger.kernel.org
Subject: [PATCH] x86/PCI: Disable E820 reserved region clipping for Clevo NL4XLU laptops
Date: Mon, 10 Oct 2022 17:02:06 +0200	[thread overview]
Message-ID: <20221010150206.142615-1-hdegoede@redhat.com> (raw)

Clevo NL4XLU barebones have the same E820 reservation covering
the entire _CRS 32-bit window issue as the Lenovo *IIL* and
Clevo X170KM-G models, relevant dmesg bits (with pci=no_e820):

 BIOS-e820: [mem 0x000000005bc50000-0x00000000cfffffff] reserved
 pci_bus 0000:00: root bus resource [mem 0x6d800000-0xbfffffff window]

Note how the e820 reservation covers the entire PCI root mem window.

Add a no_e820 quirk for these models to fix the touchpad not working
(due to Linux being unable to assign a PCI BAR for the i2c-controller).

Link: https://bugzilla.kernel.org/show_bug.cgi?id=216565
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 arch/x86/pci/acpi.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
index 2f82480fd430..45ef65d31a40 100644
--- a/arch/x86/pci/acpi.c
+++ b/arch/x86/pci/acpi.c
@@ -189,6 +189,19 @@ static const struct dmi_system_id pci_crs_quirks[] __initconst = {
 			DMI_MATCH(DMI_BOARD_NAME, "X170KM-G"),
 		},
 	},
+
+	/*
+	 * Clevo NL4XLU barebones have the same E820 reservation covering
+	 * the entire _CRS 32-bit window issue as the Lenovo *IIL* models.
+	 * See https://bugzilla.kernel.org/show_bug.cgi?id=216565
+	 */
+	{
+		.callback = set_no_e820,
+		.ident = "Clevo NL4XLU Barebone",
+		.matches = {
+			DMI_MATCH(DMI_BOARD_NAME, "NL4XLU"),
+		},
+	},
 	{}
 };
 
-- 
2.37.3


             reply	other threads:[~2022-10-10 15:02 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-10-10 15:02 Hans de Goede [this message]
2022-10-11 17:40 ` [PATCH] x86/PCI: Disable E820 reserved region clipping for Clevo NL4XLU laptops Bjorn Helgaas
2022-10-12  8:23   ` Hans de Goede
2022-12-02 21:58     ` Bjorn Helgaas
2022-12-04  9:42       ` Hans de Goede
2022-12-06 17:26         ` Bjorn Helgaas
2022-12-06 19:26           ` Hans de Goede

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