On 08/12/2018 18:12, Martin Blumenstingl wrote: > This series adds support for the Mali-450 GPU on Meson8 and Meson8b. > Meson6 uses a Mali-400 GPU but since we don't have a clock driver (and > I don't have a device for testing) Meson6 is left out in this series. > > Meson8 uses a Mali-450 MP6 with six pixel processors. Meson8b (as > cost-reduced SoC) uses a Mali-450 MP2 with two pixel processors. > I tested both using the open source lima driver and a patched mesa > from the lima project as well. Since we don't have display support > on the 32-bit SoCs I used off-screen rendering as described in [0]. > The result is (for example): [1] > > The bootloader (at least on my boards) leaves the Mali clock disabled > by default. The board crashes when trying to access the Mali registers > with the "core" clock disabled. > Thus this series also implements the required clock driver changes. The > Mali clock tree on Meson8b and Meson8m2 is almost identical to the one > on GXBB (see the description of patch #3 for more details). Only Meson8 > is slightly different as it doesn't have a glitch-free mux. Patch #2 > prepares the meson8b clock driver so we can have different clocks per > SoC. > > Dependencies: > - the .dts changes depend on my other series "ARM: dts: meson: add the > APB/APB2 busses" from [2] > - the .dts changes from this series have no compile-time dependency on > the clock driver changes because CLKID_MALI was defined in the > dt-bindings since the first version of the clock driver (but it was > not used until now). > - the .dts changes from this series have a runtime dependency on the > clock driver changes (also from this series) if you have a kernel > patched with the lima driver (without the lima driver there's no > runtime dependency) > > Other notes: > By default the GPU runs off the XTAL clock (24MHz). The lima driver > currently does not update the GPU clock rate. Different frequencies > have to be requested by adding the following properties to the Mali > GPU node (to run it at 510MHz for example): > assigned-clocks = <&clkc CLKID_MALI>; > assigned-clock-rates = <510000000>; > > > [0] https://gitlab.freedesktop.org/lima/web/wikis/home > [1] https://abload.de/img/dump0myic0.png > [2] https://patchwork.kernel.org/cover/10719445/ > > > Martin Blumenstingl (5): > dt-bindings: gpu: mali-utgard: add Amlogic Meson8 and Meson8b > compatible > clk: meson: meson8b: use a separate clock table for Meson8 > clk: meson: meson8b: add the GPU clock tree > ARM: dts: meson8: add the Mali-450 MP6 GPU > ARM: dts: meson8b: add the Mali-450 MP2 GPU > > .../bindings/gpu/arm,mali-utgard.txt | 6 + > arch/arm/boot/dts/meson8.dtsi | 58 +++ > arch/arm/boot/dts/meson8b.dtsi | 46 +++ > drivers/clk/meson/meson8b.c | 349 +++++++++++++++++- > drivers/clk/meson/meson8b.h | 9 +- > 5 files changed, 461 insertions(+), 7 deletions(-) > Applied patches 2 & 3 to next/drivers for Linux 5.1 Kevin, have fun with the other patches ! Neil
