On Mon, Oct 14, 2024 at 02:33:11PM +0200, Michal Wilczynski wrote: > The T-head TH1520 SoC supports a hardware mailbox that enables two cores > within the SoC to communicate and coordinate [1]. One example of such > coordination would be cooperation with the T-Head E902 core, which is > responsible for power, clock, and resource management. For example, in > the specific case of the BXM-4-64 GPU, it needs to be powered on by the > E902 core, and the kernel running on the E910 needs to 'ask' the > firmware running on the E902 core to enable power to the GPU island. > Given recent advancements in work on the upstream GPU driver [2], there > is an emerging need to get this code in the mainline kernel. > > Link: https://openbeagle.org/beaglev-ahead/beaglev-ahead/-/blob/main/docs/TH1520%20System%20User%20Manual.pdf [1] > Link: https://gitlab.freedesktop.org/imagination/linux-firmware/-/issues/1 [2] > > Thanks, Krzysztof and Rob, for your review! Since this series is gaining > some interest, I've dropped the RFC prefix with the v3 update. I've applied this series and booted okay. I see the driver loaded: /sys/devices/platform/soc/ffffc38000.mailbox/driver points to /sys/bus/platform/drivers/th1520-mbox How do you test that the communication with the E902 is working correctly? Thanks, Drew
