[RK3288][Android6.0] 除錯筆記 --- 讀取當前DDR頻率方法
OS: Android 6.0
Kernel: 3.10.92
ddr和gpu的clock都受dvfs模組管控, 所以只要執行:
[email protected]:/ # cat /sys/dvfs/dvfs_tree
kernel log中打印出來:
[ 2264.928913] DVFS TREE:
[ 2264.928977] |
[ 2264.928977] |- voltage domain:vd_gpu
[ 2264.929069] |- current voltage:1150000
[ 2264.929125] |- current regu_mode:UNKNOWN
[ 2264.929199] | |
[ 2264.929199] | |- power domain:pd_gpu, status = OFF, current volt = 1150000, current regu_mode = UNKNOWN
[ 2264.929423] | | |
[ 2264.929423] | | |- clock: clk_gpu current: rate 480000, volt = 1150000, enable_dvfs = ENABLE
[ 2264.929550] | | |- clk limit(enable):[99000000, 480000000]; last set rate = 480000
[ 2264.929624] | | | |- freq = 99000, volt = 900000
[ 2264.929689] | | | |- freq = 198000, volt = 900000
[ 2264.929751] | | | |- freq = 297000, volt = 950000
[ 2264.929814] | | | |- freq = 417000, volt = 1050000
[ 2264.929877] | | | |- freq = 480000, volt = 1150000
[ 2264.929949] | | |- clock: clk_gpu current: rate 480000
[ 2264.930019] |
[ 2264.930019] |- voltage domain:vd_logic
[ 2264.930105] |- current voltage:1100000
[ 2264.930161] |- current regu_mode:UNKNOWN
[ 2264.930231] | |
[ 2264.930231] | |- power domain:pd_vio, status = OFF, current volt = 1100000, current regu_mode = UNKNOWN
[ 2264.930348] | | |
[ 2264.930348] | | |- clock: aclk_vio1 current: rate 410000, volt = 1100000, enable_dvfs = ENABLE
[ 2264.930463] | | |- clk limit(enable):[82000000, 410000000]; last set rate = 410000
[ 2264.930534] | | | |- freq = 82000, volt = 1100000
[ 2264.930597] | | | |- freq = 410000, volt = 1100000
[ 2264.930670] | | |- clock: aclk_vio1 current: rate 410000, regu_mode = UNKNOWN, regu_mode_en = 0
[ 2264.930753] | |
[ 2264.930753] | |- power domain:pd_ddr, status = OFF, current volt = 1100000, current regu_mode = UNKNOWN
[ 2264.930868] | | |
[ 2264.930868] | | |- clock: clk_ddr current: rate 396000, volt = 1100000, enable_dvfs = ENABLE
[ 2264.930982] | | |- clk limit(enable):[200000000, 528000000]; last set rate = 396000
[ 2264.931053] | | | |- freq = 200000, volt = 1050000
[ 2264.931116] | | | |- freq = 300000, volt = 1050000
[ 2264.931178] | | | |- freq = 396000, volt = 1100000
[ 2264.931239] | | | |- freq = 528000, volt = 1150000
[ 2264.931309] | | |- clock: clk_ddr current: rate 396000
[ 2264.931379] |
[ 2264.931379] |- voltage domain:vd_arm
[ 2264.931464] |- current voltage:900000
[ 2264.931519] |- current regu_mode:UNKNOWN
[ 2264.931588] | |
[ 2264.931588] | |- power domain:pd_core, status = OFF, current volt = 900000, current regu_mode = UNKNOWN
[ 2264.931701] | | |
[ 2264.931701] | | |- clock: clk_core current: rate 126000, volt = 900000, enable_dvfs = ENABLE
[ 2264.931814] | | |- clk limit(enable):[126000000, 1608000000]; last set rate = 126000
[ 2264.931885] | | | |- freq = 126000, volt = 900000
[ 2264.931947] | | | |- freq = 216000, volt = 900000
[ 2264.932008] | | | |- freq = 312000, volt = 900000
[ 2264.932222] | | | |- freq = 408000, volt = 900000
[ 2264.932290] | | | |- freq = 600000, volt = 900000
[ 2264.932353] | | | |- freq = 696000, volt = 950000
[ 2264.932415] | | | |- freq = 816000, volt = 1000000
[ 2264.932478] | | | |- freq = 1008000, volt = 1050000
[ 2264.932542] | | | |- freq = 1200000, volt = 1100000
[ 2264.932604] | | | |- freq = 1416000, volt = 1200000
[ 2264.932667] | | | |- freq = 1512000, volt = 1300000
[ 2264.932729] | | | |- freq = 1608000, volt = 1350000
[ 2264.932801] | | |- clock: clk_core current: rate 126000, regu_mode = UNKNOWN, regu_mode_en = 0
[ 2264.932870] -------------DVFS TREE END------------
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