netdev - Re: [PATCH] wifi: ath11k: Add a warning for wcn6855 spurious wakeup events

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Message-ID: <87mt4zqmgh.fsf@kernel.org>
Date:   Mon, 27 Feb 2023 15:14:54 +0200
From:   Kalle Valo <kvalo@...nel.org>
To:     Mario Limonciello <mario.limonciello@....com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, ath11k@...ts.infradead.org,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] wifi: ath11k: Add a warning for wcn6855 spurious wakeup events

Mario Limonciello <mario.limonciello@....com> writes:

> On 2/27/23 06:36, Kalle Valo wrote:
>
>> Mario Limonciello <mario.limonciello@....com> writes:
>>
>>> When WCN6855 firmware versions less than 0x110B196E are used with
>>> an AMD APU and the user puts the system into s2idle spurious wakeup
>>> events can occur. These are difficult to attribute to the WLAN F/W
>>> so add a warning to the kernel driver to give users a hint where
>>> to look.
>>>
>>> This was tested on WCN6855 and a Lenovo Z13 with the following
>>> firmware versions:
>>> WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.9
>>> WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.23
>>>
>>> Link: http://lists.infradead.org/pipermail/ath11k/2023-February/004024.html
>>> Link: https://gitlab.freedesktop.org/drm/amd/-/issues/2377
>>> Link: https://bugs.launchpad.net/ubuntu/+source/linux-firmware/+bug/2006458
>>> Link:
>>> https://lore.kernel.org/linux-gpio/20221012221028.4817-1-mario.limonciello@amd.com/
>>> Signed-off-by: Mario Limonciello <mario.limonciello@....com>
>>
>> [...]
>>
>>> +static void ath11k_check_s2idle_bug(struct ath11k_base *ab)
>>> +{
>>> +	struct pci_dev *rdev;
>>> +
>>> +	if (pm_suspend_target_state != PM_SUSPEND_TO_IDLE)
>>> +		return;
>>> +
>>> +	if (ab->id.device != WCN6855_DEVICE_ID)
>>> +		return;
>>> +
>>> +	if (ab->qmi.target.fw_version >= WCN6855_S2IDLE_VER)
>>> +		return;
>>> +
>>> +	rdev = pci_get_domain_bus_and_slot(0, 0, PCI_DEVFN(0, 0));
>>> +	if (rdev->vendor == PCI_VENDOR_ID_AMD)
>>> + ath11k_warn(ab, "fw_version 0x%x may cause spurious wakeups.
>>> Upgrade to 0x%x or later.",
>>> +			    ab->qmi.target.fw_version, WCN6855_S2IDLE_VER);
>>
>> I understand the reasons for this warning but I don't really trust the
>> check 'ab->qmi.target.fw_version >= WCN6855_S2IDLE_VER'. I don't know
>> how the firmware team populates the fw_version so I'm worried that if we
>> ever switch to a different firmware branch (or similar) this warning
>> might all of sudden start triggering for the users.
>>
>
> In that case, maybe would it be better to just have a list of the
> public firmware with issue and ensure it doesn't match one of those?

You mean ath11k checking for known broken versions and reporting that?
We have so many different firmwares to support in ath11k, I'm not really
keen on adding tests for a specific version.

We have a list of known important bugs in the wiki:

https://wireless.wiki.kernel.org/en/users/drivers/ath11k#known_bugslimitations

What about adding the issue there, would that get more exposure to the
bug and hopefully the users would upgrade the firmware?

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