linux-kernel - Re: stable-rc 4.14: arm64: Internal error: Oops: clk_reparent __clk_set_parent

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Date:   Thu, 23 Jul 2020 01:06:37 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Arnd Bergmann <arnd@...db.de>,
        Naresh Kamboju <naresh.kamboju@...aro.org>
Cc:     linux- stable <stable@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        freedreno <freedreno@...ts.freedesktop.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sasha Levin <sashal@...nel.org>, lkft-triage@...ts.linaro.org,
        Michael Turquette <mturquette@...libre.com>,
        Rob Clark <robdclark@...omium.org>,
        Robin Murphy <robin.murphy@....com>,
        Jordan Crouse <jcrouse@...eaurora.org>,
        Eric Anholt <eric@...olt.net>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        samuel@...lland.org
Subject: Re: stable-rc 4.14: arm64: Internal error: Oops: clk_reparent __clk_set_parent_before on db410c

Quoting Arnd Bergmann (2020-07-21 02:51:32)
>                         __clk_set_parent_before(orphan, parent);
> 
> None of the above have changed in stable kernels.
> 
> > [    5.633668]  pll_28nm_register+0xa4/0x340 [msm]
> > [    5.637492]  msm_dsi_pll_28nm_init+0xc8/0x1d8 [msm]
> > [    5.642007]  msm_dsi_pll_init+0x34/0xe0 [msm]
> > [    5.646870]  dsi_phy_driver_probe+0x1cc/0x310 [msm]
> 
> The only changes to the dsi driver in v4.14-stable were:
> 
> 89e30bb46074 drm/msm/dsi: save pll state before dsi host is powered off
> 892afde0f4a1 drm: msm: Fix return type of dsi_mgr_connector_mode_valid for kCFI
> 35ff594b0da2 drm/msm/dsi: Implement reset correctly
> 5151a0c8d730 drm/msm/dsi: use correct enum in dsi_get_cmd_fmt
> e6bc3a4b0c23 clk: divider: fix incorrect usage of container_of
> 
> None of these look suspicious to me.
> 

It sounds like maybe you need this patch?

bdcf1dc25324 ("clk: Evict unregistered clks from parent caches")

or 

4368a1539c6b ("drm/msm: Depopulate platform on probe failure")

I vaguelly recall that the display driver wasn't removing clks becaues
it wasn't removing devices when probe defer happened and then we had
dangling clks in the parent cache confusing things.