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

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Date:   Mon, 27 Feb 2023 14:36:46 +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:

> 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.

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