linux-kernel - Re: [PATCH v4 0/4] spi: cadence-qspi: Fix runtime PM and system-wide suspend

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Date: Tue, 27 Feb 2024 10:33:08 +0530
From: Dhruva Gole <d-gole@...com>
To: Mark Brown <broonie@...nel.org>
CC: Apurva Nandan <a-nandan@...com>,
        Théo Lebrun
	<theo.lebrun@...tlin.com>,
        <linux-spi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Gregory CLEMENT
	<gregory.clement@...tlin.com>,
        Vladimir Kondratiev
	<vladimir.kondratiev@...ileye.com>,
        Thomas Petazzoni
	<thomas.petazzoni@...tlin.com>,
        Tawfik Bayouk <tawfik.bayouk@...ileye.com>, Nishanth <nm@...com>,
        Vignesh <vigneshr@...com>
Subject: Re: [PATCH v4 0/4] spi: cadence-qspi: Fix runtime PM and system-wide
 suspend

Hi,

On Feb 26, 2024 at 13:40:00 +0000, Mark Brown wrote:
> On Mon, Feb 26, 2024 at 01:27:57PM +0000, Mark Brown wrote:
> > On Mon, Feb 26, 2024 at 05:48:03PM +0530, Dhruva Gole wrote:
> > > On Feb 22, 2024 at 19:13:29 +0000, Mark Brown wrote:
> 
> > [    1.709414] Call trace:
> > [    1.711852]  __mutex_lock.constprop.0+0x84/0x540
> > [    1.716460]  __mutex_lock_slowpath+0x14/0x20
> > [    1.720719]  mutex_lock+0x48/0x54
> > [    1.724026]  spi_controller_suspend+0x30/0x7c
> > [    1.728377]  cqspi_suspend+0x1c/0x6c
> > [    1.731944]  pm_generic_runtime_suspend+0x2c/0x44
> > [    1.736640]  genpd_runtime_suspend+0xa8/0x254
> 
> > (it's generally helpful to provide the most relevant section directly.)
> 
> > The issue here appears to be that we've registered for runtime suspend
> > prior to registering the controller...
> 
> Actually, no - after this series cqspi_suspend() is the system not
> runtime PM operation and should not be called from runtime suspend.  How
> is that happening?

I tried dropping this entire series, it doesn't really solve the kernel
boot issues. Also this particular stack dump isn't easily reproducible
either. Perhaps this series may not be the rootcause, I will need some
more time to see what's breaking boot for us.

But for now this series seems to be in the clear. Will keep you posted
if I find anything funny here.

FYI- We're just using the arm64 defconfig and respective device DTs


-- 
Best regards,
Dhruva Gole <d-gole@...com>