Description LeoLiu-oc 2022-10-27 17:37:27 UTC

Description of problem:
There exits some problems with enabling ahci controller runtime pm on
various Zhaoxin platforms.

Version-Release number of selected component (if applicable):


Steps to verify:
测试环境：
1)	任意主板/任意Linux OS
2)	OS盘接在usb2sata上，平台不接其它sata controler，且zx ahci controller上不接任何device；

测试Case：
1）	Enable ahci runtime pm 
=====================================
#!/bin/bash
HOST=$(lspci -D | grep "SATA controller" | cut -f 1 -d ' ')
# Enable runtime PM for all SATA ports
for port in /sys/bus/pci/devices/$HOST/ata*; do
	echo auto > $port/power/control
done
# Then for the host controller
echo auto > /sys/bus/pci/devices/$HOST/power/control
======================================
2）	 执行# lspci –xxxx –s 00:0f.0 查看0xC4的值是否是0x0(0x0代表controller在D0，0x3代表controller在D3)


Expected results:
前面读到0xC4为0x0即认为pass