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

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Message-ID: <20220322190753.GF297526@darkstar.musicnaut.iki.fi>
Date:   Tue, 22 Mar 2022 21:07:53 +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 Tue, Mar 22, 2022 at 06:36:48PM +0200, Aaro Koskinen wrote:
> 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):
[...]
> [    0.928863] calling  omap1_init_devices+0x0/0x2c @ 1

It hangs in omap_sram_reprogram_clock() (<- omap1_select_table_rate()
<- omap1_clk_late_init()).

A.