kernel 5.7.8

1 files changed, 96 insertions, 0 deletions

diff --git a/SOURCES/0001-drm-Use-generic-helper-to-check-_PR3-presence.patch b/SOURCES/0001-drm-Use-generic-helper-to-check-_PR3-presence.patch
new file mode 100644
index 0000000..f0f9e0d
--- /dev/null
+++ b/SOURCES/0001-drm-Use-generic-helper-to-check-_PR3-presence.patch
@@ -0,0 +1,96 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Kai-Heng Feng <kai.heng.feng@canonical.com>
+Date: Thu, 23 Apr 2020 14:23:58 +0800
+Subject: [PATCH] drm: Use generic helper to check _PR3 presence
+
+Replace nouveau_pr3_present() in favor of a more generic one,
+pci_pr3_present().
+
+Also the presence of upstream bridge _PR3 doesn't need to go hand in
+hand with device's _DSM, so check _PR3 before _DSM.
+
+Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
+Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
+---
+ drivers/gpu/drm/nouveau/nouveau_acpi.c | 44 ++++++--------------------
+ 1 file changed, 10 insertions(+), 34 deletions(-)
+
+diff --git a/drivers/gpu/drm/nouveau/nouveau_acpi.c b/drivers/gpu/drm/nouveau/nouveau_acpi.c
+index fe3a10255c36..b84dff1b0f28 100644
+--- a/drivers/gpu/drm/nouveau/nouveau_acpi.c
++++ b/drivers/gpu/drm/nouveau/nouveau_acpi.c
+@@ -212,37 +212,6 @@ static const struct vga_switcheroo_handler nouveau_dsm_handler = {
+ 	.get_client_id = nouveau_dsm_get_client_id,
+ };
+
+-/*
+- * Firmware supporting Windows 8 or later do not use _DSM to put the device into
+- * D3cold, they instead rely on disabling power resources on the parent.
+- */
+-static bool nouveau_pr3_present(struct pci_dev *pdev)
+-{
+-	struct pci_dev *parent_pdev = pci_upstream_bridge(pdev);
+-	struct acpi_device *parent_adev;
+-
+-	if (!parent_pdev)
+-		return false;
+-
+-	if (!parent_pdev->bridge_d3) {
+-		/*
+-		 * Parent PCI bridge is currently not power managed.
+-		 * Since userspace can change these afterwards to be on
+-		 * the safe side we stick with _DSM and prevent usage of
+-		 * _PR3 from the bridge.
+-		 */
+-		pci_d3cold_disable(pdev);
+-		return false;
+-	}
+-
+-	parent_adev = ACPI_COMPANION(&parent_pdev->dev);
+-	if (!parent_adev)
+-		return false;
+-
+-	return parent_adev->power.flags.power_resources &&
+-		acpi_has_method(parent_adev->handle, "_PR3");
+-}
+-
+ static void nouveau_dsm_pci_probe(struct pci_dev *pdev, acpi_handle *dhandle_out,
+ 				  bool *has_mux, bool *has_opt,
+ 				  bool *has_opt_flags, bool *has_pr3)
+@@ -250,6 +219,16 @@ static void nouveau_dsm_pci_probe(struct pci_dev *pdev, acpi_handle *dhandle_out
+ 	acpi_handle dhandle;
+ 	bool supports_mux;
+ 	int optimus_funcs;
++	struct pci_dev *parent_pdev;
++
++	*has_pr3 = false;
++	parent_pdev = pci_upstream_bridge(pdev);
++	if (parent_pdev) {
++		if (parent_pdev->bridge_d3)
++			*has_pr3 = pci_pr3_present(parent_pdev);
++		else
++			pci_d3cold_disable(pdev);
++	}
+
+ 	dhandle = ACPI_HANDLE(&pdev->dev);
+ 	if (!dhandle)
+@@ -270,7 +249,6 @@ static void nouveau_dsm_pci_probe(struct pci_dev *pdev, acpi_handle *dhandle_out
+ 	*has_mux = supports_mux;
+ 	*has_opt = !!optimus_funcs;
+ 	*has_opt_flags = optimus_funcs & (1 << NOUVEAU_DSM_OPTIMUS_FLAGS);
+-	*has_pr3 = false;
+
+ 	if (optimus_funcs) {
+ 		uint32_t result;
+@@ -280,8 +258,6 @@ static void nouveau_dsm_pci_probe(struct pci_dev *pdev, acpi_handle *dhandle_out
+ 			 (result & OPTIMUS_ENABLED) ? "enabled" : "disabled",
+ 			 (result & OPTIMUS_DYNAMIC_PWR_CAP) ? "dynamic power, " : "",
+ 			 (result & OPTIMUS_HDA_CODEC_MASK) ? "hda bios codec supported" : "");
+-
+-		*has_pr3 = nouveau_pr3_present(pdev);
+ 	}
+ }
+
+-- 
+2.26.2
+