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On Rockchip RK3588 trying to change the SCMI_CLK_GPU rate when the GPU device is PM runtime suspended may cause a kernel panic: $ echo 1000000000 > /sys/class/devfreq/fb000000.gpu/min_freq SError Interrupt on CPU4, code 0x00000000be000411 -- SError CPU: 4 UID: 0 PID: 241 Comm: sh Not tainted 6.15.0-rc3 #1 VOLUNTARY Hardware name: Radxa ROCK 5B (DT) pstate: 60400009 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : smc_send_message+0x140/0x148 lr : smc_send_message+0xd8/0x148 sp : ffff8000827138c0 x29: ffff8000827138c0 x28: ffff000008764000 x27: 0000000000000000 x26: 0000000000000000 x25: 00000000ffffffff x24: ffff800082713b28 x23: ffff00000696b010 x22: ffff000003db4da0 x21: ffff000003fdae80 x20: ffff0000053f22c0 x19: ffff000003db4d80 x18: 0000000000000000 x17: 0000000000000000 x16: 0000000000000000 x15: 00000000245df550 x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000 x11: 0000000000000040 x10: ffff000003fde138 x9 : ffff000003fde130 x8 : ffff000005e5c948 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000000 x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000000 Kernel panic - not syncing: Asynchronous SError Interrupt CPU: 4 UID: 0 PID: 241 Comm: sh Not tainted 6.15.0-rc3 #1 VOLUNTARY Hardware name: Radxa ROCK 5B (DT) Call trace: show_stack+0x28/0x78 (C) dump_stack_lvl+0x58/0x74 dump_stack+0x14/0x1c panic+0x14c/0x328 add_taint+0x0/0xc0 arm64_serror_panic+0x60/0x6c do_serror+0x24/0x60 el1h_64_error_handler+0x2c/0x40 el1h_64_error+0x6c/0x70 smc_send_message+0x140/0x148 (P) do_xfer+0xb0/0x1f8 scmi_clock_rate_set+0xc0/0x220 scmi_clk_set_rate+0x24/0x38 clk_change_rate+0x164/0x288 clk_core_set_rate_nolock+0x1dc/0x314 clk_set_rate+0x34/0x144 _opp_config_clk_single+0x2c/0x90 _set_opp+0x104/0x564 dev_pm_opp_set_rate+0x110/0x260 panthor_devfreq_target+0x38/0x60 [panthor] devfreq_set_target+0x84/0x180 devfreq_update_target+0xb4/0xcc update_devfreq+0x10/0x18 set_freq_store+0x6c/0xb4 dev_attr_store+0x14/0x24 sysfs_kf_write+0x54/0x60 kernfs_fop_write_iter+0x118/0x1e0 vfs_write+0x224/0x390 ksys_write+0x68/0x100 __arm64_sys_write+0x18/0x20 invoke_syscall+0x44/0x100 el0_svc_common.constprop.0+0x3c/0xe0 do_el0_svc+0x18/0x20 el0_svc+0x2c/0xc0 el0t_64_sync_handler+0x104/0x130 el0t_64_sync+0x170/0x174 SMP: stopping secondary CPUs Kernel Offset: disabled CPU features: 0x0e00,000000e0,01202650,8201700b Memory Limit: 3838 MB ---[ end Kernel panic - not syncing: Asynchronous SError Interrupt ]--- This typically happen when CLK_GPU is disabled or when PD_GPU is down. Add a config_clks ops that will not set core clk rate when the device is PM runtime suspended. Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Purpose of This Repository
This repository contains a customized version of the Linux kernel, maintained by the Armbian team, with specific adaptations for Rockchip SoCs (System-on-Chips) used in a wide range of ARM-based single board computers.
It serves as the base for:
- Kernel development and maintenance for Armbian-supported devices.
- Hardware enablement, performance tuning, and stability patches specific to Rockchip-based platforms.
- Integration with the Armbian build framework to produce ready-to-use OS images.
This repository is intended for developers, testers, and contributors working with the Armbian project and the broader Rockchip ARM ecosystem.