LKML Archive on
help / color / mirror / Atom feed
From: Kevin Hilman <>
To: Martin Blumenstingl <>,
	Martin Blumenstingl <>
Subject: Re: [PATCH 1/1] ARM: dts: meson8b: fix the operating voltage of the Mali GPU
Date: Tue, 14 May 2019 17:01:37 -0700	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

Martin Blumenstingl <> writes:

> Amlogic's vendor kernel defines an OPP for the GPU on Meson8b boards
> with a voltage of 1.15V. It turns out that the vendor kernel relies on
> the bootloader to set up the voltage. The bootloader however sets a
> fixed voltage of 1.10V.
> Amlogic's patched u-boot sources (uboot-2015-01-15-23a3562521) confirm
> this:
> $ grep -oiE "VDD(EE|AO)_VOLTAGE[ ]+[0-9]+" board/amlogic/configs/m8b_*
>   board/amlogic/configs/m8b_m100_v1.h:VDDAO_VOLTAGE            1100
>   board/amlogic/configs/m8b_m101_v1.h:VDDAO_VOLTAGE            1100
>   board/amlogic/configs/m8b_m102_v1.h:VDDAO_VOLTAGE            1100
>   board/amlogic/configs/m8b_m200_v1.h:VDDAO_VOLTAGE            1100
>   board/amlogic/configs/m8b_m201_v1.h:VDDEE_VOLTAGE            1100
>   board/amlogic/configs/m8b_m201_v1.h:VDDEE_VOLTAGE            1100
>   board/amlogic/configs/m8b_m202_v1.h:VDDEE_VOLTAGE            1100
> Another hint at this is the VDDEE voltage on the EC-100 and Odroid-C1
> boards. The VDDEE regulator supplies the Mali GPU. It's basically a copy
> of the VCCK (CPU supply) which means it's limited to 0.86V to 1.14V.
> Update the operating voltage of the Mali GPU on Meson8b to 1.10V so it
> matches with what the vendor u-boot sets.
> Fixes: c3ea80b6138cae ("ARM: dts: meson8b: add the Mali-450 MP2 GPU")
> Signed-off-by: Martin Blumenstingl <>

Queued as a fix for v5.2-rc (branch: v5.2/fixes)


      reply	other threads:[~2019-05-15  0:01 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-12 19:39 [PATCH 0/1] ARM: dts: meson8b: another GPU fix Martin Blumenstingl
2019-05-12 19:39 ` [PATCH 1/1] ARM: dts: meson8b: fix the operating voltage of the Mali GPU Martin Blumenstingl
2019-05-15  0:01   ` Kevin Hilman [this message]

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \ \ \ \ \ \ \
    --subject='Re: [PATCH 1/1] ARM: dts: meson8b: fix the operating voltage of the Mali GPU' \

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).