| Message ID | 20190512193936.26557-2-martin.blumenstingl@googlemail.com (mailing list archive) |
|---|---|
| State | Mainlined |
| Commit | 26d65140e92a626e39c73c9abf769fd174bf5076 |
| Headers | show |
| Series | ARM: dts: meson8b: another GPU fix | expand |
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
diff --git a/arch/arm/boot/dts/meson8b.dtsi b/arch/arm/boot/dts/meson8b.dtsi index 4b919590dae5..ec67f49116d9 100644 --- a/arch/arm/boot/dts/meson8b.dtsi +++ b/arch/arm/boot/dts/meson8b.dtsi @@ -163,23 +163,23 @@ opp-255000000 { opp-hz = /bits/ 64 <255000000>; - opp-microvolt = <1150000>; + opp-microvolt = <1100000>; }; opp-364300000 { opp-hz = /bits/ 64 <364300000>; - opp-microvolt = <1150000>; + opp-microvolt = <1100000>; }; opp-425000000 { opp-hz = /bits/ 64 <425000000>; - opp-microvolt = <1150000>; + opp-microvolt = <1100000>; }; opp-510000000 { opp-hz = /bits/ 64 <510000000>; - opp-microvolt = <1150000>; + opp-microvolt = <1100000>; }; opp-637500000 { opp-hz = /bits/ 64 <637500000>; - opp-microvolt = <1150000>; + opp-microvolt = <1100000>; turbo-mode; }; };
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> --- arch/arm/boot/dts/meson8b.dtsi | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-)