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    SubjectRe: [PATCH v2 00/41] drm: Analog TV Improvements
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    Den 01.09.2022 21.35, skrev Noralf Trønnes:
    >
    >
    > I have finally found a workaround for my kernel hangs.
    >
    > Dom had a look at my kernel and found that the VideoCore was fine, and
    > he said this:
    >
    >> That suggests cause of lockup was on arm side rather than VC side.
    >>
    >> But it's hard to diagnose further. Once you've had a peripheral not
    >> respond, the AXI bus locks up and no further operations are possible.
    >> Usual causes of this are required clocks being stopped or domains
    >> disabled and then trying to access the hardware.
    >>
    >
    > So when I got this on my 64-bit build:
    >
    > [ 166.702171] SError Interrupt on CPU1, code 0x00000000bf000002 -- SError
    > [ 166.702187] CPU: 1 PID: 8 Comm: kworker/u8:0 Tainted: G W
    > 5.19.0-rc6-00096-gba7973977976-dirty #1
    > [ 166.702200] Hardware name: Raspberry Pi 4 Model B Rev 1.1 (DT)
    > [ 166.702206] Workqueue: events_freezable_power_ thermal_zone_device_check
    > [ 166.702231] pstate: 200000c5 (nzCv daIF -PAN -UAO -TCO -DIT -SSBS
    > BTYPE=--)
    > [ 166.702242] pc : regmap_mmio_read32le+0x10/0x28
    > [ 166.702261] lr : regmap_mmio_read+0x44/0x70
    > ...
    > [ 166.702606] bcm2711_get_temp+0x58/0xb0 [bcm2711_thermal]
    >
    > I wondered if that reg read was stalled due to a clock being stopped.
    >
    > Lo and behold, disabling runtime pm and keeping the vec clock running
    > all the time fixed it[1].
    >
    > I don't know what the problem is, but at least I can now test this patchset.
    >
    > [1] https://gist.github.com/notro/23b984e7fa05cfbda2db50a421cac065
    >

    It turns out I didn't have to disable runtime pm:
    https://gist.github.com/notro/0adcfcb12460b54e54458afe11dc8ea2

    Noralf.

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