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Date:   Sat, 19 Mar 2022 23:21:19 +0200
From:   Aaro Koskinen <aaro.koskinen@iki.fi>
To:     Tony Lindgren <tony@atomide.com>,
        Janusz Krzysztofik <jmkrzyszt@gmail.com>
Cc:     Paul Walmsley <paul@pwsan.com>,
        Alan Stern <stern@rowland.harvard.edu>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Helge Deller <deller@gmx.de>, linux-omap@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-usb@vger.kernel.org,
        linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org,
        Arnd Bergmann <arnd@arndb.de>
Subject: Re: [RFC RFT PATCH 0/4] ARM: OMAP1: clock: Convert to CCF
Message-ID: <20220319212119.GG1986@darkstar.musicnaut.iki.fi>
References: <20220310233307.99220-1-jmkrzyszt@gmail.com>
 <YixWZ+IiN2l9jmzg@atomide.com>
 <20220319184952.GF1986@darkstar.musicnaut.iki.fi>
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In-Reply-To: <20220319184952.GF1986@darkstar.musicnaut.iki.fi>
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Hi,

On Sat, Mar 19, 2022 at 08:49:55PM +0200, Aaro Koskinen wrote:
> On Sat, Mar 12, 2022 at 10:14:31AM +0200, Tony Lindgren wrote:
> > * Janusz Krzysztofik <jmkrzyszt@gmail.com> [220310 23:32]:
> > > The main motivation behind this series is planned resurection of OMAP1
> > > camera driver.  Since OMAP1 clock internals have never been visible to
> > > drivers, that driver used to use v4l2-clk to expose a pixel clock for a
> > > sensor.  The v4l2-clk code has been recently depreciated and removed from
> > > the media subtree, hence the need for an alternative solution.
> > 
> > Nice :) This will also help Arnd with building multi-v5 kernels.
> 
> This will need more testing still... The patch 4 is breaking at least 770
> (the display/fb doesn't work anymore).

Patches 1-3 are OK on Nokia 770, OSK and Palm TE.

Patch 4 breaks 770, but OSK and Palm TE are OK.

Below is the problem with 770. As a quick hack, I tried replacing
all clk_enable/disable()s with prepare_enable/disable_unprepare()s in
drivers/video/fbdev/omap/hwa742.c and drivers/video/fbdev/omap/sossi.c
and that seems to help...

[    0.374389] omapfb: lph8923 rev 92 LCD detected, 16 data lines
[    0.374816] omapfb: configured for panel lph8923
[    0.383789] omapfb: LCDC initialized
[    0.384216] ------------[ cut here ]------------
[    0.384368] WARNING: CPU: 0 PID: 1 at drivers/clk/clk.c:1012 clk_core_enable+0x94/0xb0
[    0.384613] Enabling unprepared ck_sossi
[    0.384704] Modules linked in:
[    0.384796] CPU: 0 PID: 1 Comm: swapper Not tainted 5.17.0-rc8-770-los_381206+-00072-gb2406fc1ddd4 #2
[    0.385009] Hardware name: Nokia 770
[    0.385101]  unwind_backtrace from show_stack+0x10/0x14
[    0.385314]  show_stack from __warn+0xac/0xe4
[    0.385528]  __warn from warn_slowpath_fmt+0x90/0xc8
[    0.385711]  warn_slowpath_fmt from clk_core_enable+0x94/0xb0
[    0.385894]  clk_core_enable from clk_core_enable_lock+0x18/0x2c
[    0.386077]  clk_core_enable_lock from sossi_init+0xa0/0x258
[    0.386260]  sossi_init from hwa742_init+0x90/0x538
[    0.386474]  hwa742_init from omapfb_do_probe+0x200/0x68c
[    0.386657]  omapfb_do_probe from mipid_spi_probe+0x1b4/0x230
[    0.386840]  mipid_spi_probe from spi_probe+0x48/0x6c
[    0.387054]  spi_probe from really_probe+0xac/0x2f0
[    0.387237]  really_probe from __driver_probe_device+0x80/0xe4
[    0.387390]  __driver_probe_device from driver_probe_device+0x30/0xd8
[    0.387573]  driver_probe_device from __driver_attach+0x70/0xf0
[    0.387756]  __driver_attach from bus_for_each_dev+0x74/0xc0
[    0.387908]  bus_for_each_dev from bus_add_driver+0x14c/0x1d8
[    0.388061]  bus_add_driver from driver_register+0x74/0x108
[    0.388244]  driver_register from do_one_initcall+0x4c/0x1cc
[    0.388427]  do_one_initcall from kernel_init_freeable+0x170/0x1f4
[    0.388641]  kernel_init_freeable from kernel_init+0x10/0x108
[    0.388824]  kernel_init from ret_from_fork+0x14/0x2c
[    0.388977] Exception stack(0xc0c41fb0 to 0xc0c41ff8)
[    0.389099] 1fa0:                                     00000000 00000000 00000000 00000000
[    0.389282] 1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[    0.389434] 1fe0: 00000000 00000000 00000000 00000000 00000013 00000000
[    0.389556] ---[ end trace 0000000000000000 ]---
[    0.389709] omapfb omapfb: invalid SoSSI sync pattern: 00000000, 00000000
[    0.389831] ------------[ cut here ]------------
[    0.389923] WARNING: CPU: 0 PID: 1 at drivers/clk/clk.c:953 clk_core_disable+0xb4/0xcc
[    0.390136] ck_sossi already disabled
[    0.390228] Modules linked in:
[    0.390319] CPU: 0 PID: 1 Comm: swapper Tainted: G        W         5.17.0-rc8-770-los_381206+-00072-gb2406fc1ddd4 #2
[    0.390502] Hardware name: Nokia 770
[    0.390594]  unwind_backtrace from show_stack+0x10/0x14
[    0.390808]  show_stack from __warn+0xac/0xe4
[    0.391021]  __warn from warn_slowpath_fmt+0x90/0xc8
[    0.391204]  warn_slowpath_fmt from clk_core_disable+0xb4/0xcc
[    0.391387]  clk_core_disable from clk_core_disable_lock+0x18/0x24
[    0.391540]  clk_core_disable_lock from sossi_init+0x1bc/0x258
[    0.391754]  sossi_init from hwa742_init+0x90/0x538
[    0.391937]  hwa742_init from omapfb_do_probe+0x200/0x68c
[    0.392120]  omapfb_do_probe from mipid_spi_probe+0x1b4/0x230
[    0.392333]  mipid_spi_probe from spi_probe+0x48/0x6c
[    0.392547]  spi_probe from really_probe+0xac/0x2f0
[    0.392730]  really_probe from __driver_probe_device+0x80/0xe4
[    0.392883]  __driver_probe_device from driver_probe_device+0x30/0xd8
[    0.393066]  driver_probe_device from __driver_attach+0x70/0xf0
[    0.393249]  __driver_attach from bus_for_each_dev+0x74/0xc0
[    0.393402]  bus_for_each_dev from bus_add_driver+0x14c/0x1d8
[    0.393585]  bus_add_driver from driver_register+0x74/0x108
[    0.393737]  driver_register from do_one_initcall+0x4c/0x1cc
[    0.393920]  do_one_initcall from kernel_init_freeable+0x170/0x1f4
[    0.394134]  kernel_init_freeable from kernel_init+0x10/0x108
[    0.394317]  kernel_init from ret_from_fork+0x14/0x2c
[    0.394470] Exception stack(0xc0c41fb0 to 0xc0c41ff8)
[    0.394592] 1fa0:                                     00000000 00000000 00000000 00000000
[    0.394775] 1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[    0.394958] 1fe0: 00000000 00000000 00000000 00000000 00000013 00000000
[    0.395080] ---[ end trace 0000000000000000 ]---
[    0.417907] omapfb omapfb: controller initialization failed (-19)

A.