linux-kernel - Re: [PATCH v2] ARM: OMAP1: Prepare for conversion of OMAP1 clocks to CCF

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Date:   Tue, 22 Mar 2022 18:36:46 +0200
From:   Aaro Koskinen <aaro.koskinen@....fi>
To:     Janusz Krzysztofik <jmkrzyszt@...il.com>
Cc:     Tony Lindgren <tony@...mide.com>, Paul Walmsley <paul@...an.com>,
        Alan Stern <stern@...land.harvard.edu>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Helge Deller <deller@....de>, linux-omap@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-usb@...r.kernel.org,
        linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Arnd Bergmann <arnd@...db.de>, Felipe Balbi <balbi@...nel.org>,
        Peter Ujfalusi <peter.ujfalusi@...il.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>, linux-mmc@...r.kernel.org,
        alsa-devel@...a-project.org
Subject: Re: [PATCH v2] ARM: OMAP1: Prepare for conversion of OMAP1 clocks to
 CCF

Hi,

On Mon, Mar 21, 2022 at 10:54:16PM +0100, Janusz Krzysztofik wrote:
> In preparation for conversion of OMAP1 clocks to common clock framework,
> identify users of those clocks which don't call clk_prepare/unprepare()
> and update them to call clk_prepare_enable/clk_disable_unprepare() instead
> of just clk_enable/disable(), as required by CCF implementation of clock
> API.
> 
> v2: update still a few more OMAP specific drivers missed in v1,
>   - call clk_prepare/unprepare() just after/before clk_get/put() where it
>     can make more sense than merging prepare/unprepare with enable/disable.

Something is still broken. When doing kexec (using CCF kernel), the
kexec'ed kernel now hangs early (on 770):

[    0.853912] MUX: initialized W4_USB_PUEN
[    0.858001] MUX: initialized V6_USB0_TXD
[    0.862060] MUX: initialized W5_USB0_SE0
[    0.866210] MUX: initialized Y5_USB0_RCV
[    0.870269] MUX: initialized AA9_USB0_VP
[    0.874389] MUX: initialized R9_USB0_VM
[    0.878356] USB: hmc 16, usb0 6 wires (dev), Mini-AB on usb0
[    0.886230] initcall customize_machine+0x0/0x30 returned 0 after 29296 usecs
[    0.893707] calling  init_atags_procfs+0x0/0xe8 @ 1
[    0.898864] initcall init_atags_procfs+0x0/0xe8 returned 0 after 0 usecs
[    0.905883] calling  exceptions_init+0x0/0x8c @ 1
[    0.910797] initcall exceptions_init+0x0/0x8c returned 0 after 0 usecs
[    0.917602] calling  omap_init+0x0/0xc @ 1
[    0.922393] initcall omap_init+0x0/0xc returned 0 after 9765 usecs
[    0.928863] calling  omap1_init_devices+0x0/0x2c @ 1
[    2.568664] random: fast init done

Probably something is now disabled that has been previously always
enabled by default/bootloader. I'll try adding some printk()s to see
the exact place where it hangs...

A.