github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-27 16:44:58 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

PCI/PME: Replace RMW of Root Status register with direct write

Browse Source 
As of PCIe r7.0, the Root Status register contains a single writeable bit
(PME Status, type RW1C) and otherwise just read-only bits and RsvdZ bits
(which software must write as zero, PCIe r7.0 sec 7.4).

Thus, when clearing the PME Status bit, there's no need to perform a
read-modify-write of the register.  Instead, the bit can be written
directly.

Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://patch.msgid.link/39f87c99f6c44be3c0371c79e454e6fde7be0d4d.1761497583.git.lukas@wunner.de
This commit is contained in:
Lukas Wunner 2025-10-26 17:57:57 +01:00 committed by Bjorn Helgaas
parent 9abf79c8d7
commit 699722468a
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/pci/pci.c
View File

@ -2256,7 +2256,7 @@ void pcie_clear_device_status(struct pci_dev *dev)
*/
void pcie_clear_root_pme_status(struct pci_dev *dev)
{
pcie_capability_set_dword(dev, PCI_EXP_RTSTA, PCI_EXP_RTSTA_PME);
pcie_capability_write_dword(dev, PCI_EXP_RTSTA, PCI_EXP_RTSTA_PME);
}
/**