linux-kernel - Re: Nokia N900 - audio TPA6130A2 problems

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Date:	Thu, 17 Mar 2016 01:49:18 +0100
From:	Sebastian Reichel <sre@...nel.org>
To:	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>
Cc:	Grygorii Strashko <grygorii.strashko@...com>,
	Pali Rohár <pali.rohar@...il.com>,
	Peter Ujfalusi <peter.ujfalusi@...com>,
	Jarkko Nikula <jarkko.nikula@...mer.com>,
	Tony Lindgren <tony@...mide.com>,
	Lars-Peter Clausen <lars@...afoo.de>,
	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
	Pavel Machek <pavel@....cz>,
	Aaro Koskinen <aaro.koskinen@....fi>,
	Nishanth Menon <nm@...com>, merlijn@...zup.org
Subject: Re: Nokia N900 - audio TPA6130A2 problems

Hi,

On Wed, Mar 16, 2016 at 09:50:40PM +0200, Ivaylo Dimitrov wrote:
> Jan  1 06:01:43 Nokia-N900 kernel: [    6.947998] omap_i2c 48070000.i2c: bus 1 rev3.3 at 2200 kHz
> Jan  1 06:01:43 Nokia-N900 kernel: [    6.960632] tpa6130a2 2-0060: Write failed
> Jan  1 06:01:43 Nokia-N900 kernel: [    6.965026] CPU: 0 PID: 6 Comm: kworker/u2:0 Not tainted 4.5.0-rc5+ #26
> Jan  1 06:01:43 Nokia-N900 kernel: [    6.972106] Hardware name: Nokia RX-51 board
> Jan  1 06:01:43 Nokia-N900 kernel: [    6.976684] Workqueue: deferwq deferred_probe_work_func
> Jan  1 06:01:43 Nokia-N900 kernel: [    6.982299] [<c0013c18>] (unwind_backtrace) from [<c0011f38>] (show_stack+0x10/0x14)
> Jan  1 06:01:43 Nokia-N900 kernel: [    6.990570] [<c0011f38>] (show_stack) from [<c0390884>] (tpa6130a2_i2c_write+0x58/0x90)
> Jan  1 06:01:43 Nokia-N900 kernel: [    6.999114] [<c0390884>] (tpa6130a2_i2c_write) from [<c0390968>] (tpa6130a2_power+0xac/0x1c4)
> Jan  1 06:01:43 Nokia-N900 kernel: [    7.008239] [<c0390968>] (tpa6130a2_power) from [<c0390d80>] (tpa6130a2_probe+0x144/0x234)
> Jan  1 06:01:43 Nokia-N900 kernel: [    7.017059] [<c0390d80>] (tpa6130a2_probe) from [<c032b650>] (i2c_device_probe+0x170/0x1b8)
> Jan  1 06:01:43 Nokia-N900 kernel: [    7.025939] [<c032b650>] (i2c_device_probe) from [<c02a7bd4>] (driver_probe_device+0x120/0x2b0)
> Jan  1 06:01:43 Nokia-N900 kernel: [    7.035247] [<c02a7bd4>] (driver_probe_device) from [<c02a62c8>] (bus_for_each_drv+0x48/0x8c)
> Jan  1 06:01:43 Nokia-N900 kernel: [    7.044311] [<c02a62c8>] (bus_for_each_drv) from [<c02a7a20>] (__device_attach+0x88/0xf8)
> Jan  1 06:01:43 Nokia-N900 kernel: [    7.053009] [<c02a7a20>] (__device_attach) from [<c02a70b0>] (bus_probe_device+0x28/0x80)
> Jan  1 06:01:43 Nokia-N900 kernel: [    7.061737] [<c02a70b0>] (bus_probe_device) from [<c02a5680>] (device_add+0x3c0/0x55c)
> Jan  1 06:01:43 Nokia-N900 kernel: [    7.070159] [<c02a5680>] (device_add) from [<c032cf28>] (i2c_new_device+0xf8/0x198)
> Jan  1 06:01:43 Nokia-N900 kernel: [    7.078308] [<c032cf28>] (i2c_new_device) from [<c032d4e8>] (i2c_register_adapter+0x2d0/0x47c)
> Jan  1 06:01:43 Nokia-N900 kernel: [    7.087432] [<c032d4e8>] (i2c_register_adapter) from [<c032f084>] (omap_i2c_probe+0x54c/0x64c)
> Jan  1 06:01:43 Nokia-N900 kernel: [    7.096618] [<c032f084>] (omap_i2c_probe) from [<c02a93bc>] (platform_drv_probe+0x58/0xa0)
> Jan  1 06:01:43 Nokia-N900 kernel: [    7.105438] [<c02a93bc>] (platform_drv_probe) from [<c02a7bd4>] (driver_probe_device+0x120/0x2b0)
> Jan  1 06:01:43 Nokia-N900 kernel: [    7.114929] [<c02a7bd4>] (driver_probe_device) from [<c02a62c8>] (bus_for_each_drv+0x48/0x8c)
> Jan  1 06:01:43 Nokia-N900 kernel: [    7.123962] [<c02a62c8>] (bus_for_each_drv) from [<c02a7a20>] (__device_attach+0x88/0xf8)
> Jan  1 06:01:43 Nokia-N900 kernel: [    7.132659] [<c02a7a20>] (__device_attach) from [<c02a70b0>] (bus_probe_device+0x28/0x80)
> Jan  1 06:01:43 Nokia-N900 kernel: [    7.141357] [<c02a70b0>] (bus_probe_device) from [<c02a7508>] (deferred_probe_work_func+0x58/0x84)
> Jan  1 06:01:43 Nokia-N900 kernel: [    7.150939] [<c02a7508>] (deferred_probe_work_func) from [<c0042a50>] (process_one_work+0x1c4/0x324)
> Jan  1 06:01:43 Nokia-N900 kernel: [    7.160705] [<c0042a50>] (process_one_work) from [<c0042ef4>] (worker_thread+0x314/0x4a8)
> Jan  1 06:01:43 Nokia-N900 kernel: [    7.169433] [<c0042ef4>] (worker_thread) from [<c00474e4>] (kthread+0xcc/0xe0)
> Jan  1 06:01:43 Nokia-N900 kernel: [    7.177154] [<c00474e4>] (kthread) from [<c000f218>] (ret_from_fork+0x14/0x3c)
> Jan  1 06:01:43 Nokia-N900 kernel: [    7.184783] tpa6130a2 2-0060: Failed to initialize chip
> Jan  1 06:01:43 Nokia-N900 kernel: [    7.190551] tpa6130a2: probe of 2-0060 failed with error -121
> Jan  1 06:01:43 Nokia-N900 kernel: [    7.197174] omap_i2c 48072000.i2c: bus 2 rev3.3 at 100 kHz
> 
> now, the only thing I can think of remaining to test is the reset gpio set-up -
> I wonder if it is possible to be set in safe mode(or input, or... ?), so the
> reset is never deasserted.

mh both, the power gpio is turned off in tpa6130a2_power(0). I guess
if you don't see the problem during probe() everything works?

I have another idea though: In opposit to the gpio, the regulator
may also be referenced by something else/already enabled. I guess
adding a sleep after the regulator_enable() is worth a try.

Also I wonder if the same happens, if you avoid having the module
available during boot and instead load it once everything has
settled. That would rule out any side-effects of other modules
being probed on the same i2c bus.

-- Sebastian

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