Forums - qpnp-labibb-regulator expansion board i2c power

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qpnp-labibb-regulator expansion board i2c power
bgauthier
Join Date: 21 Jun 21
Posts: 3
Posted: Mon, 2022-12-19 12:09
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Hi All,
 
I have an i2c controlled MIPI OLED display mounted on the expansion board of an HDK 865/SM8250.
 
I need to control the AB/LAB/ELVDD/Amoled Boost and IBB/ELVSS/Inverted Block Boost regulators via my own driver with custom values.
 
I followed the Qualcomm documentation and did:
 
  1. Replace the vendor/qcom/proprietary/devicetree-4.19/qcom/pm8150l.dtsi::pm8150a_amoled::compatible from "qcom,qpnp-amoled-regulator"  to "qcom,qpnp-labibb-regulator"
  2. Modified kernel/msm-4.19/arch/arm64/configs/vendor/kona_defconfig from (CONFIG_REGULATOR_QPNP_AMOLED=y, CONFIG_REGULATOR_QPNP_LABIBB=n) to (CONFIG_REGULATOR_QPNP_AMOLED=n, CONFIG_REGULATOR_QPNP_LABIBB=y), 
  3. Trace the kernel/msm-4.19/drivers/regulator/qpnp-labibb-regulator.c and adapted the device tree until the qpnp-labibb-regulator load happily.

I seem to be able to controlled the AB and IBB regulators with (1. to 3.) above.

However, when switching the regulator control from 'amoled' to 'labibb' (see 1. above), the expansion board i2c controller is no longer powered when turning on Android which prevent me to send commands to my MIPI OLED display over i2c.

Question: "What am I misssing to turn-on the power on the expansion board when using the 'qcom,qpnp-labibb-regulator' driver"?
 
Thanks and regards,
Bruno

 

 

 

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Re: qpnp-labibb-regulator expansion board i2c power
handzhu
Join Date: 6 Jun 22
Posts: 54
Posted: Thu, 2022-12-22 21:22
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Hi 

seems you can download the source code and qualcomm document, 

maybe you can create a case to qualcomm, (Multimedia->Display->Display Tuning)

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Re: qpnp-labibb-regulator expansion board i2c power
bgauthier
Join Date: 21 Jun 21
Posts: 3
Posted: Wed, 2023-01-04 06:47
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Good morning, Handzu,

Thanks for helping me with this problem.

Yes, I do have access to the source code of the HDK865/SM8250.
Would you mind letting me know where to create a case at Qualcomm, I don't have that URL.

Thanks again, best regards
Bruno

 

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Re: qpnp-labibb-regulator expansion board i2c power
handzhu
Join Date: 6 Jun 22
Posts: 54
Posted: Wed, 2023-01-04 22:04
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Hi 

you can try to access the qualcomm case support system:

https://qualcomm-cdmatech-support.lightning.force.com/

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