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Date: Thu, 25 Apr 2024 10:32:14 +0200
From: Marco Felsch <m.felsch@pengutronix.de>
To: Shengjiu Wang <shengjiu.wang@gmail.com>
Cc: Francesco Dolcini <francesco@dolcini.it>, peng.fan@nxp.com,
	s.hauer@pengutronix.de, sboyd@kernel.org, festevam@gmail.com,
	mturquette@baylibre.com, linux-kernel@vger.kernel.org,
	linux-clk@vger.kernel.org, linux-imx@nxp.com, kernel@pengutronix.de,
	shawnguo@kernel.org, Shengjiu Wang <shengjiu.wang@nxp.com>,
	linux-arm-kernel@lists.infradead.org, abelvesa@kernel.org
Subject: Re: [PATCH v4] clk: imx: imx8mp: Add pm_runtime support for power
 saving
Message-ID: <20240425083214.g6xplxql4g32zxud@pengutronix.de>
References: <1711026842-7268-1-git-send-email-shengjiu.wang@nxp.com>
 <20240424164725.GA18760@francesco-nb>
 <CAA+D8AMxcAOdeSUhLnFdX2tjXSiWKg8-oxfZ8oT06-qQPnNKqA@mail.gmail.com>
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On 24-04-25, Shengjiu Wang wrote:
> On Thu, Apr 25, 2024 at 12:47 AM Francesco Dolcini <francesco@dolcini.it> wrote:
> >
> > On Thu, Mar 21, 2024 at 09:14:02PM +0800, Shengjiu Wang wrote:
> > > Add pm_runtime support for power saving. In pm runtime suspend
> > > state the registers will be reseted, so add registers save
> > > in pm runtime suspend and restore them in pm runtime resume.
> > >
> > > Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
> > > Reviewed-by: Peng Fan <peng.fan@nxp.com>
> >
> > Is this introducing a regression?
> >
> >   800 13:50:19.713052  <6>[   16.531134] clk: Disabling unused clocks
> >   801 13:50:19.727524  <2>[   16.535413] SError Interrupt on CPU2, code 0x00000000bf000002 -- SError
> >   802 13:50:19.731400  <4>[   16.535421] CPU: 2 PID: 1 Comm: swapper/0 Not tainted 6.9.0-rc5-next-20240424 #1
> >   803 13:50:19.742514  <4>[   16.535428] Hardware name: Toradex Verdin iMX8M Plus on Dahlia Board (DT)
> >   804 13:50:19.747157  <4>[   16.535431] pstate: 80000005 (Nzcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> >   805 13:50:19.758468  <4>[   16.535442] pc : clk_imx8mp_audiomix_runtime_resume+0x24/0x48
> >   806 13:50:19.759372  <4>[   16.535456] lr : pm_generic_runtime_resume+0x2c/0x44
> >   807 13:50:19.759587  <4>[   16.535465] sp : ffff800082b8bb90
> >   808 13:50:19.774512  <4>[   16.535468] x29: ffff800082b8bb90 x28: 0000000000000000 x27: 0000000000000000
> >   809 13:50:19.775367  <4>[   16.535482] x26: 0000000000000000 x25: 0000000000000000 x24: 0000000000000000
> >   810 13:50:19.790567  <4>[   16.535495] x23: ffff0000c0f7a4e0 x22: ffff0000c26922f8 x21: 0000000000000000
> >   811 13:50:19.791308  <4>[   16.535508] x20: ffff0000c2692000 x19: ffff0000c0e30c10 x18: 0000000000000000
> >   812 13:50:19.794834  <4>[   16.535521] x17: 000000007e4712cb x16: ffff80008296f800 x15: 0000000000000030
> >   813 13:50:19.807341  <4>[   16.535532] x14: ffff0000c00b8080 x13: 00000000000003f9 x12: 0000000000000000
> >   814 13:50:19.810740  <4>[   16.535545] x11: 0000000000000000 x10: 0000000000000aa0 x9 : ffff800082b8bb20
> >   815 13:50:19.822528  <4>[   16.535559] x8 : ffff0000c00b8b00 x7 : 0000000000000000 x6 : ffff0000c00b8000
> >   816 13:50:19.827173  <4>[   16.535570] x5 : ffff8000836b0000 x4 : ffff0000c2f3a488 x3 : ffff8000813660d0
> >   817 13:50:19.838446  <4>[   16.535583] x2 : 0000000000000004 x1 : 0000000000000001 x0 : 00000000ff777777
> >   818 13:50:19.839321  <0>[   16.535597] Kernel panic - not syncing: Asynchronous SError Interrupt
> >   819 13:50:19.839983  Matched prompt #9: Kernel panic - not syncing
> >   820 13:50:19.840155  Setting prompt string to ['end Kernel panic[^\\r]*\\r', '/ #', 'Login timed out', 'Login incorrect']
> >   821 13:50:19.854524  <4>[   16.535601] CPU: 2 PID: 1 Comm: swapper/0 Not tainted 6.9.0-rc5-next-20240424 #1
> >   822 13:50:19.855261  <4>[   16.535609] Hardware name: Toradex Verdin iMX8M Plus on Dahlia Board (DT)
> >   823 13:50:19.858660  <4>[   16.535613] Call trace:
> >   824 13:50:19.870455  <4>[   16.535616]  dump_backtrace+0x94/0xec
> >   825 13:50:19.870763  <4>[   16.535626]  show_stack+0x18/0x24
> >   826 13:50:19.871258  <4>[   16.535635]  dump_stack_lvl+0x38/0x90
> >   827 13:50:19.874714  <4>[   16.535647]  dump_stack+0x18/0x24
> >   828 13:50:19.874964  <4>[   16.535656]  panic+0x388/0x3c8
> >   829 13:50:19.886551  <4>[   16.535667]  nmi_panic+0x48/0x94
> >   830 13:50:19.888318  <4>[   16.535679]  arm64_serror_panic+0x6c/0x78
> >   831 13:50:19.888531  <4>[   16.535688]  do_serror+0x3c/0x78
> >   832 13:50:19.892592  <4>[   16.535693]  el1h_64_error_handler+0x30/0x48
> >   833 13:50:19.902540  <4>[   16.535703]  el1h_64_error+0x64/0x68
> >   834 13:50:19.903437  <4>[   16.535709]  clk_imx8mp_audiomix_runtime_resume+0x24/0x48
> >   835 13:50:19.907712  <4>[   16.535719]  __genpd_runtime_resume+0x30/0xa8
> >   836 13:50:19.918505  <4>[   16.535729]  genpd_runtime_resume+0xb4/0x29c
> >   837 13:50:19.918770  <4>[   16.535741]  __rpm_callback+0x48/0x198
> >   838 13:50:19.919372  <4>[   16.535749]  rpm_callback+0x68/0x74
> >   839 13:50:19.922715  <4>[   16.535754]  rpm_resume+0x3cc/0x680
> >   840 13:50:19.934495  <4>[   16.535762]  __pm_runtime_resume+0x4c/0x90
> >   841 13:50:19.934784  <4>[   16.535769]  clk_pm_runtime_get_all+0x58/0x164
> >   842 13:50:19.935344  <4>[   16.535780]  clk_disable_unused+0x2c/0x178
> >   843 13:50:19.938873  <4>[   16.535793]  do_one_initcall+0x6c/0x1b0
> >   844 13:50:19.950539  <4>[   16.535799]  kernel_init_freeable+0x1c8/0x290
> >   845 13:50:19.951360  <4>[   16.535812]  kernel_init+0x20/0x1dc
> >   846 13:50:19.951585  <4>[   16.535821]  ret_from_fork+0x10/0x20
> >   847 13:50:19.954803  <2>[   16.535831] SMP: stopping secondary CPUs
> >   848 13:50:19.966688  <0>[   16.535838] Kernel Offset: disabled
> >   849 13:50:19.967221  <0>[   16.535841] CPU features: 0x0,00000040,00100000,4200421b
> >   850 13:50:19.967360  <0>[   16.535845] Memory Limit: none
> >   851 13:50:19.985117  <0>[   16.788060] ---[ end Kernel panic - not syncing: Asynchronous SError Interrupt ]---
> >
> > from
> >
> > https://storage.kernelci.org/next/master/next-20240424/arm64/defconfig/gcc-10/lab-broonie/baseline-imx8mp-verdin-nonwifi-dahlia.html
> > https://lore.kernel.org/all/66293535.170a0220.21fe.a2e7@mx.google.com/
> >
> 
> Sorry that I didn't use a clean community kernel for the test.

:/ I have asked you if you have tested this feature since I was aware of
bugs regarding PM.

> On my local side I added delay in drivers/pmdomain/imx/gpcv2.c
> so there was no such issue.
> 
> But according to drivers/pmdomain/imx/gpcv2.c, seems that I need
> to add delay in this driver, like this:

"Seems" shouldn't be really a "The root cause for this is".

Regards,
  Marco

>  static int clk_imx8mp_audiomix_runtime_resume(struct device *dev)
>  {
> +       /*
> +        * According to the drivers/pmdomain/imx/gpcv2.c
> +        * need to wait for reset to propagate
> +        */
> +       udelay(5);
> +
> 
> I will submit a patch for it.
> 
> Thanks for reporting it
> 
> Best regards
> Shengjiu Wang
> 
> 
> 
> > Francesco
> >
> 
>