From b516ea586d717472178e6ef1c152e85608b0ce32 Mon Sep 17 00:00:00 2001 From: Lukas Wunner Date: Mon, 8 Jul 2019 13:17:44 +0800 Subject: [PATCH] PCI: Enable NVIDIA HDA controllers Many NVIDIA GPUs can be configured as either a single-function video device or a multi-function device with video at function 0 and an HDA audio controller at function 1. The HDA controller can be enabled or disabled by a bit in the function 0 config space. Some BIOSes leave the HDA disabled, which means the HDMI connector from the NVIDIA GPU may not work. Sometimes the BIOS enables the HDA if an HDMI cable is connected at boot time, but that doesn't handle hotplug cases. Enable the HDA controller on device enumeration and resume and re-read the header type, which tells us whether the GPU is a multi-function device. This quirk is limited to NVIDIA PCI devices with the VGA Controller device class. This is expected to correspond to product configurations where the NVIDIA GPU has connectors attached. Other products where the device class is 3D Controller are expected to correspond to configurations where the NVIDIA GPU is dedicated (dGPU) and has no connectors. See original post (URL below) for more details. This commit takes inspiration from an earlier patch by Daniel Drake. Link: https://lore.kernel.org/r/20190708051744.24039-1-drake@endlessm.com v2 Link: https://lore.kernel.org/r/20190613063514.15317-1-drake@endlessm.com v1 Link: https://devtalk.nvidia.com/default/topic/1024022 Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=75985 Signed-off-by: Lukas Wunner Signed-off-by: Daniel Drake [bhelgaas: commit log, log message, return early if already enabled] Signed-off-by: Bjorn Helgaas Cc: Aaron Plattner Cc: Peter Wu Cc: Ilia Mirkin Cc: Karol Herbst Cc: Maik Freudenberg --- drivers/pci/quirks.c | 30 ++++++++++++++++++++++++++++++ include/linux/pci_ids.h | 1 + 2 files changed, 31 insertions(+) diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index c66c0ca446c4..208aacf39329 100644 --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -5012,6 +5012,36 @@ DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID, quirk_gpu_usb_typec_ucsi); /* + * Enable the NVIDIA GPU integrated HDA controller if the BIOS left it + * disabled. https://devtalk.nvidia.com/default/topic/1024022 + */ +static void quirk_nvidia_hda(struct pci_dev *gpu) +{ + u8 hdr_type; + u32 val; + + /* There was no integrated HDA controller before MCP89 */ + if (gpu->device < PCI_DEVICE_ID_NVIDIA_GEFORCE_320M) + return; + + /* Bit 25 at offset 0x488 enables the HDA controller */ + pci_read_config_dword(gpu, 0x488, &val); + if (val & BIT(25)) + return; + + pci_info(gpu, "Enabling HDA controller\n"); + pci_write_config_dword(gpu, 0x488, val | BIT(25)); + + /* The GPU becomes a multi-function device when the HDA is enabled */ + pci_read_config_byte(gpu, PCI_HEADER_TYPE, &hdr_type); + gpu->multifunction = !!(hdr_type & 0x80); +} +DECLARE_PCI_FIXUP_CLASS_HEADER(PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID, + PCI_BASE_CLASS_DISPLAY, 16, quirk_nvidia_hda); +DECLARE_PCI_FIXUP_CLASS_RESUME_EARLY(PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID, + PCI_BASE_CLASS_DISPLAY, 16, quirk_nvidia_hda); + +/* * Some IDT switches incorrectly flag an ACS Source Validation error on * completions for config read requests even though PCIe r4.0, sec * 6.12.1.1, says that completions are never affected by ACS Source diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h index 70e86148cb1e..66898463b81f 100644 --- a/include/linux/pci_ids.h +++ b/include/linux/pci_ids.h @@ -1336,6 +1336,7 @@ #define PCI_DEVICE_ID_NVIDIA_NFORCE_MCP78S_SMBUS 0x0752 #define PCI_DEVICE_ID_NVIDIA_NFORCE_MCP77_IDE 0x0759 #define PCI_DEVICE_ID_NVIDIA_NFORCE_MCP73_SMBUS 0x07D8 +#define PCI_DEVICE_ID_NVIDIA_GEFORCE_320M 0x08A0 #define PCI_DEVICE_ID_NVIDIA_NFORCE_MCP79_SMBUS 0x0AA2 #define PCI_DEVICE_ID_NVIDIA_NFORCE_MCP89_SATA 0x0D85 -- 2.11.0