TAS5825M: TAS Device Linux Driver and Bin File Generator Profiles

Rudolf Streif

Part Number: TAS5825M

We have an application with three TAS5825m devices, two of them configured as 2.0 stereo amps (high and mid range) and one of them configured as 1.0 PBTL mono amp (low range).

I have created three configurations, one for each amplifier, with crossover frequency filters in the DSP. I am using these configurations for the init profile in the Bin File Generator tool. These are the base configurations as they don't change (the crossover frequencies remain the same). If I am playing sound uing the init profile, the crossover filters work correctly.

I have then added another profile, called music. All it does for now it take the amp speaker output from high-Z to play mode in PRE_POWER_UP and return them to high-Z in PRE_SHUTDOWN. This works when I am playing sound. However, for some reason the DSP filters are not applied anymore. The speakers produce sound but the full frequency range is applied to all speakers, whereas when running the init profile only the speakers receive their correct frequency ranges.

I was under the impression that the profile settings are applied in addition to the settings of the init profile. In my case, that means that all DSP settings from the init profile are kept in place, since the music profile only sets the DEVICE_CTRL2 register.

Please see the JSON file for the regbin tool attached (I had to rename the file from .json to .txt as the uploader does not upload files with extension .json).

Note: When playing back using the init profile, the driver sends the register settings sequentially to the amps via I2C. Since there are a lot of settings this takes a little time causing the amps to drop out sequentially. Sending only a few registers does not cause this problem.

Thank you for your support.

tas5825m-3amp-reg-flat.txt

5 months ago

0 Shenghao Ding 5 months ago

TI__Genius 16510 points

Before swtching to music, have the chip physically shutdown? If so, you must reload all the settings.

0 Shenghao Ding 5 months ago

TI__Genius 16510 points

Could you try to add block PRE_SHUTDOWN in init block?

BTW, what's your driver version (or kernel version)?

0 Rudolf Streif 5 months ago in reply to Shenghao Ding

Prodigy 190 points

No, the chip is not physically shut down when switching profiles.

What would I put in the PRE_SHUTDOWN block in the init block?

Kernel version is 5.15 with this driver: git.ti.com/.../

0 Shenghao Ding 5 months ago in reply to Rudolf Streif

TI__Genius 16510 points

Just put TAS5825m in HiZ, as has done in block music.

0 Shenghao Ding 5 months ago in reply to Rudolf Streif

TI__Genius 16510 points

Hi Guy

I don't think you use the right driver. The driver from git.ti.com has been EoL, it has not supported init.

https://tidrive.ext.ti.com/u/iNUqJ91VKkGa1Sor/44a3f155-a8d4-46c0-9cb0-73aa25487dc3?l

access code: 14yj.Rrk

We have upstream the patch for init to Linux mainline, see following link,

ASoC: tas2781: Add keyword "init" in profile section - kernel/git/torvalds/linux.git - Linux kernel source tree

In folder "for kernel 5.15", you can find the latest driver for kernel 5,15 which has already supported init.

0 Rudolf Streif 5 months ago in reply to Shenghao Ding

Prodigy 190 points

Thank you.

I tried the new driver. You have provided access for me to it in the context of this question: RE: TAS5825M: PBTL Input Mixer

However, while the driver built and loads it is not able to communicate with the chips. There are issues with the I2C communication. These are the error messages:

[   29.846530] tasdev-codec 5-004c: tasdevice_change_chn_book, E=-6
[   29.852554] tasdev-codec 5-004c: process_block: single write error

At the time you said that this would address the problem:

Thanks for your feedback. 


// TAS58xx need run this function
static void mpa_hwrst(struct gpio_desc *desc)
{
	gpiod_set_value_cansleep(desc, 0);
	usleep_range(500, 1000);
	gpiod_set_value_cansleep(desc, 1);
}

I will raise a new patch to fix this issue shortly.

Has this been addressed?

Thank you.

0 Shenghao Ding 5 months ago in reply to Rudolf Streif

TI__Genius 16510 points

I have checked other platforms from my customers and our hardware guy; this function can work well. I'm not sure what's wrong with your platform. I think this is not a big issue. Modify it in your device.

0 Rudolf Streif 5 months ago in reply to Shenghao Ding

Prodigy 190 points

I did not write the driver. Where and when should that function be run?

0 Shenghao Ding 5 months ago in reply to Rudolf Streif

TI__Genius 16510 points

What's your device config setting? ACPI? Devicetree? Could you help share thee whole log?

BTW, could you try again after apply the patch below?
git.kernel.org/.../tas2781-i2c.c

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TAS5825M: TAS Device Linux Driver and Bin File Generator Profiles