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From: Kevin Hilman <khilman@baylibre.com>
To: Martin Blumenstingl <martin.blumenstingl@googlemail.com>,
	linux-amlogic@lists.infradead.org
Cc: linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org,
	Martin Blumenstingl <martin.blumenstingl@googlemail.com>
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: <7hwoisd1r2.fsf@baylibre.com> (raw)
In-Reply-To: <20190512193936.26557-2-martin.blumenstingl@googlemail.com>

Martin Blumenstingl <martin.blumenstingl@googlemail.com> 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 <martin.blumenstingl@googlemail.com>

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

Kevin

      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]

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