linux-kernel - Re: [PATCH] arm64: dts: qcom: sdm845-tama: Keep labibb on, so kernel can disable it

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Message-ID: <gpyodjdhf77czjdln6gotv63rci2pxteto5lhtp4mwn3bxmuyh@65lrkjapg5i2>
Date: Mon, 5 Jan 2026 10:42:07 -0600
From: Bjorn Andersson <andersson@...nel.org>
To: david@...t.cz
Cc: Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Subject: Re: [PATCH] arm64: dts: qcom: sdm845-tama: Keep labibb on, so kernel
 can disable it

On Tue, Dec 02, 2025 at 12:31:11PM +0100, David Heidelberg via B4 Relay wrote:
> From: David Heidelberg <david@...t.cz>
> 
> In case if they were enabled by the bootloader as part of some
> reference/common routine and left hanging. Linux will switch them off if
> they're never used.

"""
It's observed that the bootloader on this device will enable the labibb
and leave them enabled, despite being unsed as these devices come with
OLED screens.

Leave the nodes active in DeviceTree to allow the operating system to
turn them off.
"""

> 
> Discussion about it can be found here:
>   https://lore.kernel.org/all/20251130-oneplus-labibb-v1-1-bb3653e43120@ixit.cz/

I think above captures the discussion, so the link can be omitted?

Regards,
Bjorn

> 
> Fixes: 5dcc6587fde2 ("arm64: dts: qcom: sdm845-tama: Add display nodes")
> Suggested-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
> Signed-off-by: David Heidelberg <david@...t.cz>
> ---
>  arch/arm64/boot/dts/qcom/sdm845-sony-xperia-tama-akatsuki.dts | 8 --------
>  1 file changed, 8 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sdm845-sony-xperia-tama-akatsuki.dts b/arch/arm64/boot/dts/qcom/sdm845-sony-xperia-tama-akatsuki.dts
> index 82e59e4533549..c2b38ecb2e9cf 100644
> --- a/arch/arm64/boot/dts/qcom/sdm845-sony-xperia-tama-akatsuki.dts
> +++ b/arch/arm64/boot/dts/qcom/sdm845-sony-xperia-tama-akatsuki.dts
> @@ -28,14 +28,6 @@ ts_vddio_supply: ts-vddio-regulator {
>  	};
>  };
>  
> -&ibb {
> -	status = "disabled";
> -};
> -
> -&lab {
> -	status = "disabled";
> -};
> -
>  &panel {
>  	/* Akatsuki uses an OLED panel. */
>  	/delete-property/ backlight;
> 
> ---
> base-commit: 95cb2fd6ce0ad61af54191fe5ef271d7177f9c3a
> change-id: 20251202-tama-labibb-352d0e3b535a
> 
> Best regards,
> -- 
> David Heidelberg <david@...t.cz>
> 
>