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From:   Mario Limonciello <mario.limonciello@amd.com>
To:     Bjorn Helgaas <bhelgaas@google.com>,
        Hans de Goede <hdegoede@redhat.com>,
        Shyam Sundar S K <Shyam-sundar.S-k@amd.com>,
        Sanket Goswami <Sanket.Goswami@amd.com>
CC:     Richard gong <richard.gong@amd.com>,
        Mario Limonciello <mario.limonciello@amd.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        "Ingo Molnar" <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        Dave Hansen <dave.hansen@linux.intel.com>, <x86@kernel.org>,
        "H. Peter Anvin" <hpa@zytor.com>, <linux-kernel@vger.kernel.org>,
        <linux-pci@vger.kernel.org>
Subject: [PATCH 1/2] amd_nb: Add PCI ID for family 19h model 78h
Date:   Thu, 27 Apr 2023 00:33:36 -0500
Message-ID: <20230427053338.16653-2-mario.limonciello@amd.com>
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s2idle previously worked on this system, but it regressed in kernel
6.4 due to commit 310e782a99c7 ("platform/x86/amd: pmc: Utilize SMN
index 0 for driver probe").

The reason for the regression is that before this commit the SMN
communication was hardcoded, but after amd_smn_read() is used which
relies upon the misc PCI ID used by DF function 3 being included in
a table.  The ID was missing for model 78h, so this meant that the
amd_smn_read() wouldn't work.

Add the missing ID into amd_nb, restoring s2idle on this system.

Fixes: 310e782a99c7 ("platform/x86/amd: pmc: Utilize SMN index 0 for driver probe")
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
---
 arch/x86/kernel/amd_nb.c | 2 ++
 include/linux/pci_ids.h  | 1 +
 2 files changed, 3 insertions(+)

diff --git a/arch/x86/kernel/amd_nb.c b/arch/x86/kernel/amd_nb.c
index 4266b64631a4..7e331e8f3692 100644
--- a/arch/x86/kernel/amd_nb.c
+++ b/arch/x86/kernel/amd_nb.c
@@ -36,6 +36,7 @@
 #define PCI_DEVICE_ID_AMD_19H_M50H_DF_F4 0x166e
 #define PCI_DEVICE_ID_AMD_19H_M60H_DF_F4 0x14e4
 #define PCI_DEVICE_ID_AMD_19H_M70H_DF_F4 0x14f4
+#define PCI_DEVICE_ID_AMD_19H_M78H_DF_F4 0x12fc
 
 /* Protect the PCI config register pairs used for SMN. */
 static DEFINE_MUTEX(smn_mutex);
@@ -79,6 +80,7 @@ static const struct pci_device_id amd_nb_misc_ids[] = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M50H_DF_F3) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M60H_DF_F3) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M70H_DF_F3) },
+	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M78H_DF_F3) },
 	{}
 };
 
diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h
index 45c3d62e616d..95f33dadb2be 100644
--- a/include/linux/pci_ids.h
+++ b/include/linux/pci_ids.h
@@ -567,6 +567,7 @@
 #define PCI_DEVICE_ID_AMD_19H_M50H_DF_F3 0x166d
 #define PCI_DEVICE_ID_AMD_19H_M60H_DF_F3 0x14e3
 #define PCI_DEVICE_ID_AMD_19H_M70H_DF_F3 0x14f3
+#define PCI_DEVICE_ID_AMD_19H_M78H_DF_F3 0x12fb
 #define PCI_DEVICE_ID_AMD_CNB17H_F3	0x1703
 #define PCI_DEVICE_ID_AMD_LANCE		0x2000
 #define PCI_DEVICE_ID_AMD_LANCE_HOME	0x2001
-- 
2.34.1