Date:   Thu, 5 Apr 2018 16:43:55 +0200
From:   "H. Nikolaus Schaller" <hns@...delico.com>
To:     Peter Ujfalusi <peter.ujfalusi@...com>
Cc:     Discussions about the Letux Kernel <letux-kernel@...nphoenux.org>,
        Tony Lindgren <tony@...mide.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-omap <linux-omap@...r.kernel.org>,
        Peter Ujfalusi <peter.ujfalusi@...com>
Subject: Re: regression: twl4030 audio/clock stopped working in v4.16

Hi Peter,

> Am 05.04.2018 um 13:05 schrieb Peter Ujfalusi <peter.ujfalusi@...com>:
> 
> Nikolaus,
> 
> can you CC me also, I have almost missed this...

Ah, good. Thanks for quick response! I was just starting to setup git bisect...

> 
> 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@48:audio: Invalid audio_mclk
>> [    1.564788] twl4030-audio: probe of 48070000.i2c:twl@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@48:audio: Invalid audio_mclk
> twl4030-audio: probe of 48070000.i2c:twl@48:audio failed with error -22

Indeed, but I see it is as listed:

root@...ux:~# dmesg|fgrep -i twl4030
[    1.787200] twl4030_reg 48070000.i2c:twl@48:regulator-vmmc2: can't register VMMC2, -22
[    1.795745] twl4030_reg: probe of 48070000.i2c:twl@48:regulator-vmmc2 failed with error -22
[    1.840789] TWL4030: HFCLK is not configured
[    1.845977] twl4030-audio 48070000.i2c:twl@48:audio: Invalid audio_mclk
[    1.852935] twl4030-audio: probe of 48070000.i2c:twl@48:audio failed with error -22
[    6.764160] twl4030_madc 48070000.i2c:twl@48:madc: 48070000.i2c:twl@48:madc supply vusb3v1 not found, using dummy regulator
[    6.872253] input: twl4030_pwrbutton as /devices/platform/68000000.ocp/48070000.i2c/i2c-0/0-0048/48070000.i2c:twl@48:pwrbutton/input/input2
[    6.997192] twl4030_gpio twl4030-gpio: can't dispatch IRQs from modules
[    7.120666] twl4030_usb 48070000.i2c:twl@48:twl4030-usb: Initialized TWL4030 USB module
[    8.176147] omap-twl4030 sound: ASoC: CODEC DAI twl4030-hifi not registered
[    8.183441] omap-twl4030 sound: devm_snd_soc_register_card() failed: -517
[    8.267120] omap-twl4030 sound: ASoC: CODEC DAI twl4030-hifi not registered
[    8.280975] omap-twl4030 sound: devm_snd_soc_register_card() failed: -517
[    8.388366] omap-twl4030 sound: ASoC: CODEC DAI twl4030-hifi not registered
[    8.404113] omap-twl4030 sound: devm_snd_soc_register_card() failed: -517
[    9.250274] omap-twl4030 sound: ASoC: CODEC DAI twl4030-hifi not registered
[    9.264312] omap-twl4030 sound: devm_snd_soc_register_card() failed: -517
[    9.653381] omap-twl4030 sound: ASoC: CODEC DAI twl4030-hifi not registered
[    9.664123] omap-twl4030 sound: devm_snd_soc_register_card() failed: -517
root@...ux:~# 

> 
> 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
> reason?
> 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.

Well, USB works for me... Strange.

> 
> 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)

root@...ux:~# dmesg|fgrep -i Skipping
[    1.691619] Skipping twl internal clock init and using bootloader value (unknown osc rate)
root@...ux:~#

So I can see this as well.

> 
> In DT the twl should have the fck clock to not depend on the bootloader
> for the HFCLK_FREQ settings.

I am not even modifying the bootloader when trying v4.15 and v4.16. I just
swap uImage and kernel modules...

The interesting question is why it did work before (for years) and stopped with v4.16-rc1.

> We do not have that for beagle-xm for sure.

I have tried your new patches:

* first patch alone shows no change

root@...ux:~# dmesg|fgrep -i twl4030
[    1.787322] twl4030_reg 48070000.i2c:twl@48:regulator-vmmc2: can't register VMMC2, -22
[    1.795867] twl4030_reg: probe of 48070000.i2c:twl@48:regulator-vmmc2 failed with error -22
[    1.834228] TWL4030: HFCLK is not configured
[    1.838714] twl4030-audio 48070000.i2c:twl@48:audio: Invalid audio_mclk
[    1.846313] twl4030-audio: probe of 48070000.i2c:twl@48:audio failed with error -22
[    6.700225] twl4030_madc 48070000.i2c:twl@48:madc: 48070000.i2c:twl@48:madc supply vusb3v1 not found, using dummy regulator
[    6.786651] input: twl4030_pwrbutton as /devices/platform/68000000.ocp/48070000.i2c/i2c-0/0-0048/48070000.i2c:twl@48:pwrbutton/input/input2
[    6.891265] twl4030_gpio twl4030-gpio: can't dispatch IRQs from modules
[    7.039764] twl4030_usb 48070000.i2c:twl@48:twl4030-usb: Initialized TWL4030 USB module
[    8.097137] Modules linked in: snd_soc_gtm601(+) pwm_omap_dmtimer(+) connector_analog_tv(+) generic_adc_battery(+) pwm_bl(+) extcon_gpio omap3_isp(+) bq27xxx_battery_hdq bq27xxx_battery videobuf2_dma_contig videobuf2_memops videobuf2_v4l2 videobuf2_common omap_hdq omap2430 snd_soc_omap_mcbsp snd_soc_omap snd_pcm_dmaengine ov9655 itg3200 v4l2_fwnode v4l2_common bmp280_i2c bmp280 at24 videodev hmc5843_i2c leds_tca6507 hmc5843_core bma180 tsc2007 lis3lv02d_i2c industrialio_triggered_buffer phy_twl4030_usb lis3lv02d kfifo_buf media input_polldev gpio_twl4030 musb_hdrc twl4030_pwrbutton twl4030_charger twl4030_madc w2sg0004 industrialio ehci_omap w2cbw003_bluetooth omapdss omapdss_base cec
[    8.609954] omap-twl4030 sound: ASoC: CODEC DAI twl4030-hifi not registered
[    8.655273] omap-twl4030 sound: devm_snd_soc_register_card() failed: -517
root@...ux:~# dmesg|fgrep -i Skipping
[    1.691162] Skipping twl internal clock init and using bootloader value (unknown osc rate)
root@...ux:~# 

* porting the second patch to omap3-gta04.dtsi solved the problem (vibra and audio is working again):

root@...ux:~# dmesg|fgrep -i twl4030
[    1.777770] twl4030_reg 48070000.i2c:twl@48:regulator-vmmc2: can't register VMMC2, -22
[    1.786315] twl4030_reg: probe of 48070000.i2c:twl@48:regulator-vmmc2 failed with error -22
[    6.704376] twl4030_madc 48070000.i2c:twl@48:madc: 48070000.i2c:twl@48:madc supply vusb3v1 not found, using dummy regulator
[    6.755828] input: twl4030:vibrator as /devices/platform/68000000.ocp/48070000.i2c/i2c-0/0-0048/48070000.i2c:twl@48:audio/twl4030-vibra/input/input2
[    6.835510] input: twl4030_pwrbutton as /devices/platform/68000000.ocp/48070000.i2c/i2c-0/0-0048/48070000.i2c:twl@48:pwrbutton/input/input3
[    6.933776] twl4030_gpio twl4030-gpio: can't dispatch IRQs from modules
[    7.115386] twl4030_usb 48070000.i2c:twl@48:twl4030-usb: Initialized TWL4030 USB module
[    8.364807] omap-twl4030 sound: twl4030-hifi <-> 49022000.mcbsp mapping ok
root@...ux:~# dmesg|fgrep -i Skipping
root@...ux:~# 

I assume that we need a similar patch for the OpenPandora as well and prepare&submit both.

BR and thanks,
Nikolaus

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