[PATCH v3] pmdomain: imx: gpcv2: Add delay after power up handshake

[Alexander Stein]

Hi,

Am Mittwoch, 15. Mai 2024, 00:08:21 CEST schrieb Adam Ford:
> On Fri, May 10, 2024 at 10:15 PM Shengjiu Wang <shengjiu.wang at nxp.com> wrote:
> >
> > AudioMix BLK-CTRL on i.MX8MP encountered an accessing register issue
> > after power up.
> >
> > [    2.181035] Kernel panic - not syncing: Asynchronous SError Interrupt
> > [    2.181038] CPU: 1 PID: 48 Comm: kworker/u16:2 Not tainted 6.9.0-rc5-next-20240424-00003-g21cec88845c6 #171
> > [    2.181047] Hardware name: NXP i.MX8MPlus EVK board (DT)
> > [    2.181050] Workqueue: events_unbound deferred_probe_work_func
> > [    2.181064] Call trace:
> > [...]
> > [    2.181142]  arm64_serror_panic+0x6c/0x78
> > [    2.181149]  do_serror+0x3c/0x70
> > [    2.181157]  el1h_64_error_handler+0x30/0x48
> > [    2.181164]  el1h_64_error+0x64/0x68
> > [    2.181171]  clk_imx8mp_audiomix_runtime_resume+0x34/0x44
> > [    2.181183]  __genpd_runtime_resume+0x30/0x80
> > [    2.181195]  genpd_runtime_resume+0x110/0x244
> > [    2.181205]  __rpm_callback+0x48/0x1d8
> > [    2.181213]  rpm_callback+0x68/0x74
> > [    2.181224]  rpm_resume+0x468/0x6c0
> > [    2.181234]  __pm_runtime_resume+0x50/0x94
> > [    2.181243]  pm_runtime_get_suppliers+0x60/0x8c
> > [    2.181258]  __driver_probe_device+0x48/0x12c
> > [    2.181268]  driver_probe_device+0xd8/0x15c
> > [    2.181278]  __device_attach_driver+0xb8/0x134
> > [    2.181290]  bus_for_each_drv+0x84/0xe0
> > [    2.181302]  __device_attach+0x9c/0x188
> > [    2.181312]  device_initial_probe+0x14/0x20
> > [    2.181323]  bus_probe_device+0xac/0xb0
> > [    2.181334]  deferred_probe_work_func+0x88/0xc0
> > [    2.181344]  process_one_work+0x150/0x290
> > [    2.181357]  worker_thread+0x2f8/0x408
> > [    2.181370]  kthread+0x110/0x114
> > [    2.181381]  ret_from_fork+0x10/0x20
> > [    2.181391] SMP: stopping secondary CPUs
> >
> 
> The imx8mp-beacon board suffers from this as well, and I can confirm
> the patch also fixes it.  It might be a coincidence, but the etnaviv
> NPU also enumerates more reliably now too.

I had a similar local hack/workaround for NPU startup. This patch address
both issues.

Tested-by: Alexander Stein <alexander.stein at ew.tq-group.com>
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