linux-kernel - Re:Re: [PATCH] Revert "ACPI: power: Turn off unused power resources unconditionally"

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Message-ID: <52c748d4.5c2f.17979b7a960.Coremail.wsj20369@163.com>
Date:   Mon, 17 May 2021 17:45:50 +0800 (CST)
From:   wsj20369 <wsj20369@....com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        "Len Brown" <lenb@...nel.org>,
        "ACPI Devel Maling List" <linux-acpi@...r.kernel.org>,
        "Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re:Re: [PATCH] Revert "ACPI: power: Turn off unused power resources
 unconditionally"



At 2021-05-14 22:05:06, "Rafael J. Wysocki" <rafael@...nel.org> wrote:
>On Fri, Apr 30, 2021 at 2:43 PM Shujun Wang <wsj20369@....com> wrote:
>>
>> This reverts commit 7e4fdeafa61f2b653fcf9678f09935e55756aed2.
>> It may cause some NVMe device probes to fail, and the system may get
>> stuck when using an NVMe device as the root filesystem.
>>
>> In the function nvme_pci_enable(struct nvme_dev *dev), as shown below,
>> readl(NVME_REG_CSTS) always returns -1 with the commit, which results in
>> the probe failed.
>>
>>   if (readl(dev->bar + NVME_REG_CSTS) == -1) {
>>         result = -ENODEV;
>>         goto disable;
>>   }
>>
>> dmesg:
>>   [    1.106280] nvme 0000:04:00.0: platform quirk: setting simple suspend
>>   [    1.109111] nvme nvme0: pci function 0000:04:00.0
>>   [    1.113066] nvme 0000:04:00.0: enabling device (0000 -> 0002)
>>   [    1.121040] nvme nvme0: Removing after probe failure status: -19
>>
>> lspci:
>>   Non-Volatile memory controller: KIOXIA Corporation Device 0001
>>
>> device uevent:
>>   DRIVER=nvme
>>   PCI_CLASS=10802
>>   PCI_ID=1E0F:0001
>>   PCI_SUBSYS_ID=1E0F:0001
>>   PCI_SLOT_NAME=0000:04:00.0
>>   MODALIAS=pci:v00001E0Fd00000001sv00001E0Fsd00000001bc01sc08i02
>>
>> This patch was tested in Lenovo Thinkpad X1.
>
>Please send me the dmidecode output from this machine or (better)
>attach it at https://bugzilla.kernel.org/show_bug.cgi?id=213019
>
>Thanks!

Hi Rafael:

Sorry for late, I have attached the acpidump and dmidecode in the https://bugzilla.kernel.org/show_bug.cgi?id=213019

BR
Shujun Wang