diff --git a/drivers/gpu/drm/nouveau/include/nvkm/subdev/pci.h b/drivers/gpu/drm/nouveau/include/nvkm/subdev/pci.h
index 112b674ed9c8..0172e0d200f8 100644
--- a/drivers/gpu/drm/nouveau/include/nvkm/subdev/pci.h
+++ b/drivers/gpu/drm/nouveau/include/nvkm/subdev/pci.h
@@ -46,6 +46,7 @@ int nv4c_pci_new(struct nvkm_device *, enum nvkm_subdev_type, int inst, struct n
 int g84_pci_new(struct nvkm_device *, enum nvkm_subdev_type, int inst, struct nvkm_pci **);
 int g92_pci_new(struct nvkm_device *, enum nvkm_subdev_type, int inst, struct nvkm_pci **);
 int g94_pci_new(struct nvkm_device *, enum nvkm_subdev_type, int inst, struct nvkm_pci **);
+int mcp79_pci_new(struct nvkm_device *, enum nvkm_subdev_type, int inst, struct nvkm_pci **);
 int gf100_pci_new(struct nvkm_device *, enum nvkm_subdev_type, int inst, struct nvkm_pci **);
 int gf106_pci_new(struct nvkm_device *, enum nvkm_subdev_type, int inst, struct nvkm_pci **);
 int gk104_pci_new(struct nvkm_device *, enum nvkm_subdev_type, int inst, struct nvkm_pci **);
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/device/base.c b/drivers/gpu/drm/nouveau/nvkm/engine/device/base.c
index ea62dc97f118..f7e02a16e5bc 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/device/base.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/device/base.c
@@ -1237,7 +1237,7 @@ nvac_chipset = {
 	.mc       = { 0x00000001, g98_mc_new },
 	.mmu      = { 0x00000001, mcp77_mmu_new },
 	.mxm      = { 0x00000001, nv50_mxm_new },
-	.pci      = { 0x00000001, g94_pci_new },
+	.pci      = { 0x00000001, mcp79_pci_new },
 	.therm    = { 0x00000001, g84_therm_new },
 	.timer    = { 0x00000001, nv41_timer_new },
 	.volt     = { 0x00000001, nv40_volt_new },
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/pci/Kbuild b/drivers/gpu/drm/nouveau/nvkm/subdev/pci/Kbuild
index a14ea0f7b1c8..90f03baeb22a 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/pci/Kbuild
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/pci/Kbuild
@@ -9,6 +9,7 @@ nvkm-y += nvkm/subdev/pci/nv4c.o
 nvkm-y += nvkm/subdev/pci/g84.o
 nvkm-y += nvkm/subdev/pci/g92.o
 nvkm-y += nvkm/subdev/pci/g94.o
+nvkm-y += nvkm/subdev/pci/mcp79.o
 nvkm-y += nvkm/subdev/pci/gf100.o
 nvkm-y += nvkm/subdev/pci/gf106.o
 nvkm-y += nvkm/subdev/pci/gk104.o
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/pci/mcp79.c b/drivers/gpu/drm/nouveau/nvkm/subdev/pci/mcp79.c
new file mode 100644
index 000000000000..e2ae242f1aa7
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/pci/mcp79.c
@@ -0,0 +1,35 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright 2026 Marek Czernohous
+ *
+ * MCP79/MCP7A (NVAC): like g94, but MSI re-arm goes through real PCI
+ * config space.  The MMIO-mirror re-arm is unreliable on this IGP and a
+ * missed re-arm kills the interrupt line (see the nv46 comment; g92
+ * already re-arms through config space for the same reason).
+ */
+#include "priv.h"
+
+static const struct nvkm_pci_func
+mcp79_pci_func = {
+	.cfg = { .addr = 0x088000, .size = 0x1000 },
+
+	.init = g84_pci_init,
+	.msi_rearm = nv46_pci_msi_rearm,
+
+	.pcie.init = g84_pcie_init,
+	.pcie.set_link = g84_pcie_set_link,
+
+	.pcie.max_speed = g84_pcie_max_speed,
+	.pcie.cur_speed = g84_pcie_cur_speed,
+
+	.pcie.set_version = g84_pcie_set_version,
+	.pcie.version = g84_pcie_version,
+	.pcie.version_supported = g92_pcie_version_supported,
+};
+
+int
+mcp79_pci_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
+	      struct nvkm_pci **ppci)
+{
+	return nvkm_pci_new_(&mcp79_pci_func, device, type, inst, ppci);
+}