linux-kernel - Re: [PATCH v2] bus: mhi: core: Add support for forced PM resume

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Date:   Thu, 9 Dec 2021 20:12:33 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Kalle Valo <kvalo@...nel.org>
Cc:     gregkh@...uxfoundation.org, mhi@...ts.linux.dev,
        hemantk@...eaurora.org, bbhatt@...eaurora.org,
        loic.poulain@...aro.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, ath11k@...ts.infradead.org,
        linux-wireless@...r.kernel.org, stable@...r.kernel.org,
        Pengyu Ma <mapengyu@...il.com>
Subject: Re: [PATCH v2] bus: mhi: core: Add support for forced PM resume

On Thu, Dec 09, 2021 at 04:35:25PM +0200, Kalle Valo wrote:
> Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org> writes:
> 
> > From: Loic Poulain <loic.poulain@...aro.org>
> >
> > For whatever reason, some devices like QCA6390, WCN6855 using ath11k
> > are not in M3 state during PM resume, but still functional. The
> > mhi_pm_resume should then not fail in those cases, and let the higher
> > level device specific stack continue resuming process.
> >
> > Add an API mhi_pm_resume_force(), to force resuming irrespective of the
> > current MHI state. This fixes a regression with non functional ath11k WiFi
> > after suspend/resume cycle on some machines.
> >
> > Bug report: https://bugzilla.kernel.org/show_bug.cgi?id=214179
> >
> > Fixes: 020d3b26c07a ("bus: mhi: Early MHI resume failure in non M3 state")
> > Cc: stable@...r.kernel.org #5.13
> > Link: https://lore.kernel.org/regressions/871r5p0x2u.fsf@codeaurora.org/
> > Reported-by: Kalle Valo <kvalo@...eaurora.org>
> > Reported-by: Pengyu Ma <mapengyu@...il.com>
> > Signed-off-by: Loic Poulain <loic.poulain@...aro.org>
> > [mani: Switched to API, added bug report, reported-by tags and CCed stable]
> > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> > ---
> >
> > Changes in v2:
> >
> > * Switched to a new API "mhi_pm_resume_force()" instead of the "force" flag as
> >   suggested by Greg. The "force" flag is now used inside the API.
> >
> > Greg: I'm sending this patch directly to you so that you can apply it to
> > char-misc once we get an ACK from Kalle.
> 
> Thanks! I now tested this patch on top v5.16-rc4 using QCA6390 and
> firmware WLAN.HST.1.0.1-01740-QCAHSTSWPLZ_V2_TO_X86-1, no issues found:
> 
> Tested-by: Kalle Valo <kvalo@...nel.org>
> 
> I'm not expecting any conflicts with ath11k, so please take this via
> Greg's tree. It would be really good to get this regression fixed in
> v5.16, so is it possible to send this to -rc releases?
> 
> For the ath11k part:
> 
> Acked-by: Kalle Valo <kvalo@...nel.org>

Thanks. If this patch looks good to Greg, then it will be queued for the next
-rc release.

Thanks,
Mani

> 
> -- 
> https://patchwork.kernel.org/project/linux-wireless/list/
> 
> https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches