[Letux-kernel] regression: twl4030 audio/clock stopped working in v4.16
peter.ujfalusi at ti.com
Thu Apr 5 13:56:15 CEST 2018
On 2018-04-05 14:05, Peter Ujfalusi wrote:
> can you CC me also, I have almost missed this...
> On 2018-04-04 21:29, H. Nikolaus Schaller wrote:
>> Hi Peter,
>> I just noticed a problem in v4.16 kernels with twl4030 audio and vibra driver no longer working.
>> Tracing it back shows that it already did appear in v4.16-rc1 and wasn't fixed up to v4.16.0.
>> Kernel v4.15.9 (the latest one where I have a binary) works.
> v4.16 works just fine on beagle-xm (including audio), omap2plus_defconfig.
>> The symptoms are:
>> [ 1.557342] twl4030-audio 48070000.i2c:twl at 48:audio: Invalid audio_mclk
>> [ 1.564788] twl4030-audio: probe of 48070000.i2c:twl at 48:audio failed with error -22
>> [ 1.839141] TWL4030: HFCLK is not configured
> Hrm, the order looks a bit weird, it should be
> TWL4030: HFCLK is not configured
> twl4030-audio 48070000.i2c:twl at 48:audio: Invalid audio_mclk
> twl4030-audio: probe of 48070000.i2c:twl at 48:audio failed with error -22
> In twl4030_audio_probe() we try to get the HFCLK rate via
> twl_get_hfclk_rate(), which is reading it with:
> twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &ctrl, R_CFG_BOOT);
>> Those are not visible in v4.15.9. And I am not aware of any changes to the gta04 device tree.
>> Do you know about this issue and a fix, before I start to bisect?
> The CFG_BOOT register of twl4030 is not configured correctly for some
> The TRM of twl4030 states that the SW should program the HFCLK_FREQ
> during boot sequence.
> If it is not done, MDAC and USB should not work either. And all sorts of
> other issues might happen.
> So the boot loader is not configuring the HFCLK_FREQ, for me it does as
> I have this line in the kernel log:
> [ 1.472503] Skipping twl internal clock init and using bootloader
> value (unknown osc rate)
> In DT the twl should have the fck clock to not depend on the bootloader
> for the HFCLK_FREQ settings. We do not have that for beagle-xm for sure.
there is a bug in twl-core for getting the clock:
and a patch for beagle-xm to add the fixed clock:
With these two, beagle-xm no longer depends on bootloader to set the
HFCLK_FREQ for twl4030.
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