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drm/nouveau: Use generic helper to check _PR3 presence

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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>
This commit is contained in:
Kai-Heng Feng 2020-04-23 14:23:58 +08:00 committed by Ben Skeggs
parent 75a708918a
commit ccfc2d5cdb
1 changed files with 10 additions and 34 deletions
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44
drivers/gpu/drm/nouveau/nouveau_acpi.c
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@ -211,37 +211,6 @@ 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)
@ -249,6 +218,16 @@ 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)
@ -269,7 +248,6 @@ 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;
@ -279,8 +257,6 @@ 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);
}
}