Hellow collegues! I am one of the developers of the Alt OS distribution https://en.altlinux.org https://en.wikipedia.org/wiki/ALT_Linux for the computer BFK3.1 https://www.baikalelectronics.ru/products/bfk31/ https://medium.com/@malafeev/first-independent-tests-of-baikal-t1-processor-and-bfk-3-1-evaluation-board-bc7c1db12046 The computer is based on the processor BE-T1000 (Baikal-T1) https://en.wikipedia.org/wiki/Baikal_CPU I use AMD SAPPHIRE Radeon R5 230 / HD 6450 (Caicos) graphics card with BFK3.1 and Linux kernel from Baikal Electronics https://github.com/baikalelectronics/Linux-kernel.4.4.xx Video driver drivers/gpu/drm/radeon There is a problem with the system freeze during the initialization of the radeon driver after a hot reboot. After a reboot with a complete power off, no freeze occurs. A hang occurs during the initialization of the radeon driver, when manipulating the graphics card registers through MMIO mechanism. I assume that the hang may be due to some kind of improper state of the video card at the time of driver initialization. After a hot reboot, I observed the following variants for the softreset GPU: 1. In this case, no hang occurs. radeon 0000:01:00.0: GPU softreset: 0x00000008 radeon 0000:01:00.0: GRBM_STATUS = 0xA0003828 radeon 0000:01:00.0: GRBM_STATUS_SE0 = 0x00000007 radeon 0000:01:00.0: GRBM_STATUS_SE1 = 0x00000007 radeon 0000:01:00.0: SRBM_STATUS = 0x200000C0 radeon 0000:01:00.0: SRBM_STATUS2 = 0x00000000 radeon 0000:01:00.0: R_008674_CP_STALLED_STAT1 = 0x00000000 radeon 0000:01:00.0: R_008678_CP_STALLED_STAT2 = 0x00010100 radeon 0000:01:00.0: R_00867C_CP_BUSY_STAT = 0x00020180 radeon 0000:01:00.0: R_008680_CP_STAT = 0x80038042 radeon 0000:01:00.0: R_00D034_DMA_STATUS_REG = 0x44C83D57 radeon 0000:01:00.0: GRBM_SOFT_RESET=0x00004001 radeon 0000:01:00.0: SRBM_SOFT_RESET=0x00000100 radeon 0000:01:00.0: GRBM_STATUS = 0x00003828 radeon 0000:01:00.0: GRBM_STATUS_SE0 = 0x00000007 radeon 0000:01:00.0: GRBM_STATUS_SE1 = 0x00000007 radeon 0000:01:00.0: SRBM_STATUS = 0x200000C0 radeon 0000:01:00.0: SRBM_STATUS2 = 0x00000000 radeon 0000:01:00.0: R_008674_CP_STALLED_STAT1 = 0x00000000 radeon 0000:01:00.0: R_008678_CP_STALLED_STAT2 = 0x00000000 radeon 0000:01:00.0: R_00867C_CP_BUSY_STAT = 0x00000000 radeon 0000:01:00.0: R_008680_CP_STAT = 0x00000000 radeon 0000:01:00.0: R_00D034_DMA_STATUS_REG = 0x44C83D57 2. After this, it hangs, usually when manipulating the graphics card registers in the evergreen_init_golden_registers function radeon 0000:01:00.0: GPU softreset: 0x00000004 radeon 0000:01:00.0: GRBM_STATUS = 0x00003828 radeon 0000:01:00.0: GRBM_STATUS_SE0 = 0x00000007 radeon 0000:01:00.0: GRBM_STATUS_SE1 = 0x00000007 radeon 0000:01:00.0: SRBM_STATUS = 0x200000C0 radeon 0000:01:00.0: SRBM_STATUS2 = 0x00000000 radeon 0000:01:00.0: R_008674_CP_STALLED_STAT1 = 0x00000000 radeon 0000:01:00.0: R_008678_CP_STALLED_STAT2 = 0x00000000 radeon 0000:01:00.0: R_00867C_CP_BUSY_STAT = 0x00000000 radeon 0000:01:00.0: R_008680_CP_STAT = 0x00000000 radeon 0000:01:00.0: R_00D034_DMA_STATUS_REG = 0x44C83146 radeon 0000:01:00.0: SRBM_SOFT_RESET=0x00100000 radeon 0000:01:00.0: GRBM_STATUS = 0x00003828 radeon 0000:01:00.0: GRBM_STATUS_SE0 = 0x00000007 radeon 0000:01:00.0: GRBM_STATUS_SE1 = 0x00000007 radeon 0000:01:00.0: SRBM_STATUS = 0x200000C0 radeon 0000:01:00.0: SRBM_STATUS2 = 0x00000000 radeon 0000:01:00.0: R_008674_CP_STALLED_STAT1 = 0x00000000 radeon 0000:01:00.0: R_008678_CP_STALLED_STAT2 = 0x00000000 radeon 0000:01:00.0: R_00867C_CP_BUSY_STAT = 0x00000000 radeon 0000:01:00.0: R_008680_CP_STAT = 0x00000000 radeon 0000:01:00.0: R_00D034_DMA_STATUS_REG = 0x44C83D57 3. The softreset GPU does not execute at all, no messages are issued about this. After this, it hangs, usually when manipulating the graphics card registers in the evergreen_init_golden_registers function I think that to workaround the problem it is need to perform a complete restart of the video card. I do not know how to do that. BFK3.1 does not allow disconnecting power on the PCI slot from Linux. The following commands echo "1" > /sys/bus/pci/devices/0000:01:00.0/remove echo "1" > /sys/bus/pci/rescan do not restart of the video card. I tried unconditionally calling evergreen_gpu_pci_config_reset from evergreen_asic_reset. Got a permanent hang when initializing the driver. I ask for your help. Tell me, please, how to properly restart the video card when initializing the driver. Dmitry Terekhin jqt4@xxxxxxxxxx jqt4@xxxxxxxxxxxx _______________________________________________ amd-gfx mailing list amd-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/amd-gfx
