Thanks!
On Thu, 23 Apr 2020 at 17:37, Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx> wrote:
>
> 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@xxxxxxxxxxxxx>
> ---
> 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);
> }
> }
>
> --
> 2.17.1
>
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> dri-devel@xxxxxxxxxxxxxxxxxxxxx
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
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