From: Kai-Heng Feng <kai.heng.feng@canonical.com>
To: bhelgaas@google.com, tiwai@suse.com
Cc: linux-pci@vger.kernel.org, alsa-devel@alsa-project.org,
Kai-Heng Feng <kai.heng.feng@canonical.com>,
linux-kernel@vger.kernel.org
Subject: [alsa-devel] [PATCH v4 1/2] PCI: Add a helper to check Power Resource Requirements _PR3 existence
Date: Wed, 25 Sep 2019 19:32:54 +0800 [thread overview]
Message-ID: <20190925113255.25062-1-kai.heng.feng@canonical.com> (raw)
A driver may want to know the existence of _PR3, to choose different
runtime suspend behavior. A user will be add in next patch.
This is mostly the same as nouveau_pr3_present().
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
---
v4:
- Let caller to find its upstream port device.
drivers/pci/pci.c | 16 ++++++++++++++++
include/linux/pci.h | 2 ++
2 files changed, 18 insertions(+)
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index e7982af9a5d8..d03f624d8928 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -5856,6 +5856,22 @@ int pci_set_vga_state(struct pci_dev *dev, bool decode,
return 0;
}
+bool pci_pr3_present(struct pci_dev *pdev)
+{
+ struct acpi_device *adev;
+
+ if (acpi_disabled)
+ return false;
+
+ adev = ACPI_COMPANION(&pdev->dev);
+ if (!adev)
+ return false;
+
+ return adev->power.flags.power_resources &&
+ acpi_has_method(adev->handle, "_PR3");
+}
+EXPORT_SYMBOL_GPL(pci_pr3_present);
+
/**
* pci_add_dma_alias - Add a DMA devfn alias for a device
* @dev: the PCI device for which alias is added
diff --git a/include/linux/pci.h b/include/linux/pci.h
index f9088c89a534..1d15c5d49cdd 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -2310,9 +2310,11 @@ struct irq_domain *pci_host_bridge_acpi_msi_domain(struct pci_bus *bus);
void
pci_msi_register_fwnode_provider(struct fwnode_handle *(*fn)(struct device *));
+bool pci_pr3_present(struct pci_dev *pdev);
#else
static inline struct irq_domain *
pci_host_bridge_acpi_msi_domain(struct pci_bus *bus) { return NULL; }
+static bool pci_pr3_present(struct pci_dev *pdev) { return false; }
#endif
#ifdef CONFIG_EEH
--
2.17.1
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next reply other threads:[~2019-09-25 11:33 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-25 11:32 Kai-Heng Feng [this message]
2019-09-25 11:32 ` [alsa-devel] [PATCH v4 2/2] ALSA: hda: Allow HDA to be runtime suspended when dGPU is not bound to a driver Kai-Heng Feng
2019-09-25 11:43 ` [alsa-devel] [PATCH v5 1/2] PCI: Add pci_pr3_present() helper to check Power Resource for D3hot Kai-Heng Feng
2019-09-26 18:36 ` Bjorn Helgaas
2019-10-07 18:49 ` [alsa-devel] [PATCH v4 2/2] ALSA: hda: Allow HDA to be runtime suspended when dGPU is not bound to a driver Kai-Heng Feng
2019-10-17 7:19 ` Takashi Iwai
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