Martin Blumenstingl <[email protected]> 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 <[email protected]>
Queued as a fix for v5.2-rc (branch: v5.2/fixes) Kevin
