Am 24.10.24 um 22:18 schrieb Stefan Wahren:
This series implement the initial S2Idle support for the Raspberry Pi, which was a long time on my TODO list [1]. The changes allow to suspend and resume the Raspberry Pi via debug UART. The focus is on the BCM2835 SoC, because it's less complex than its successors and have enough documentation. Now the VC4 part has been split from the series [4], because of some issues in that part. Cherry-picking of patches should be fine. Test steps: - configure debug console (pl011 or mini UART) as wakeup source - send system to idle state echo freeze > /sys/power/state - wakeup system by console traffic The clock gating must be restored, because otherwise we have a regression on Raspberry Pi 3 B+ . Luckily the disabling of clock gating isn't necessary anymore. Thanks to the rest of the DWC2 patches which based on an idea of Doug Anderson. The USB domain is now powered down and the USB devices are still usable after resume. There might be room for improvements, but at least the system won't freeze forever as before. Here are some figures for the Raspberry Pi 1 (without any devices connected except of a debug UART): running but CPU idle = 1.67 W S2Idle = 1.33 W In comparison with HDMI & USB keyboard connected (but neither active nor wakeup source): running but CPU idle = 1.82 W S2Idle = 1.33 W The series has been successfully tested on the following platforms: Raspberry Pi 1 B Raspberry Pi 3 B+ Changes in V4: - added Reviewed-by from Doug - dropped applied VC4 improvement patches - fix DWC2 register backup - add revert because of Raspberry Pi 3B+ regression - add suspend/resume support for DMA & eMMC to be on the safe side
Sorry, i missed the version in the other patches :-(
