Commit 02f56f77 authored by leoliu-oc's avatar leoliu-oc
Browse files

Turning off Zhaoxin ahci controller runtime pm 

zhaoxin inclusion
category: other
bugzilla: https://gitee.com/openeuler/kernel/issues/I8WZ2Y


CVE: NA

-----------------

There exits some problems with enabling ahci controller runtime pm on
various Zhaoxin platforms.

For some Zhaoxin CPUs, link into listen mode, and PHY into P2, which will
cause the device to continuously send comminit. When the controller is in
D3, the comminit will continuously wake up the controller, resulting in
the controller being unable to stabilize at D3;

For another Zhaoxin CPUs, after entering and exiting runtime pm for a
certain number of times, ahci controller reset accumulates for many times,
which will make ahci and PXPTRF P2CW think that the other party can no
longer receive requests and block the P2CW path, resulting in failure to
recognize the device;

There are alse some Zhaoxin CPUs, the test is normal, but considering that
the server platform is not sensitive to power consumption, and this part
has very little impact on power consumption;

Signed-off-by: default avatarleoliu-oc <leoliu-oc@zhaoxin.com>
parent c2f62f1b

drivers/ata/ahci.c

+5 −0
Original line number Diff line number Diff line
@@ -900,6 +900,11 @@ static int ahci_pci_device_runtime_suspend(struct device *dev) 
	struct pci_dev *pdev = to_pci_dev(dev);

	struct ata_host *host = pci_get_drvdata(pdev);



	if (pdev->vendor == PCI_VENDOR_ID_ZHAOXIN && pdev->revision <= 0x20) {

		dev_err(&pdev->dev, "zx ahci controller does not support runtime pm!\n");

		return -EIO;

	}



	ahci_pci_disable_interrupts(host);

	return 0;

}