Update the data from the measurements performed at HW and SW levels. Cf. http://www.omappedia.org/wiki/Power_Management_Device_Latencies_Measurement for a detailed explanation on where are the numbers coming from.
ToDo: - Measure the wake-up latencies for all power domains for OMAP3 - Correct some numbers when sys_clkreq and sys_offmode are supported Signed-off-by: Jean Pihet <[email protected]> Reviewed-by: Kevin Hilman <[email protected]> --- arch/arm/mach-omap2/cpuidle34xx.c | 52 +++++++++++++++++++++++++++---------- 1 files changed, 38 insertions(+), 14 deletions(-) diff --git a/arch/arm/mach-omap2/cpuidle34xx.c b/arch/arm/mach-omap2/cpuidle34xx.c index 9319f94..9438385 100644 --- a/arch/arm/mach-omap2/cpuidle34xx.c +++ b/arch/arm/mach-omap2/cpuidle34xx.c @@ -295,6 +295,30 @@ DEFINE_PER_CPU(struct cpuidle_device, omap3_idle_dev); * * - target_residency: required amount of time in the C state * to break even on energy cost + * + * The MPU latency and threshold values for the C-states are the worst case + * values from the HW and SW, as described in details at + * http://www.omappedia.org/wiki/Power_Management_Device_Latencies_Measurement#cpuidle_results + * + * Measurements conditions and remarks: + * . the measurements have been performed at OPP50 + * . the sys_offmode signal is not supported and so not used for the + * measurements. Instead the latency and threshold values for C9 are + * corrected with the value for Triton 2, which is 11.5ms + * . the sys_clkreq signal is not used and so a correction is needed - TBD + * . the sys_clkoff signal is supported, this value need to be corrected with + * the correct value of SYSCLK on/off timings (1ms for sysclk on, 2.5ms + * for sysclk off) + * . the setup time of DPLLs is included in the measured values. However + * this is only valid for DPLLs that are enabled to auto-idle at + * measurement time. There currently is no provision for the dynamic + * nature of the auto-idle setting + * . in order to force the cpuidle algorithm to chose the power efficient + * C-states (C1, C3, C5, C7) in preference, the other C-states have a + * threshold value equal to the next power efficient C-state + * + * The latency and threshold values can be overriden by data from the board + * files, using omap3_pm_init_cpuidle. */ struct cpuidle_driver omap3_idle_driver = { .name = "omap3_idle", @@ -302,56 +326,56 @@ struct cpuidle_driver omap3_idle_driver = { .states = { { .enter = omap3_enter_idle, - .exit_latency = 2 + 2, - .target_residency = 5, + .exit_latency = 73 + 78, + .target_residency = 152, .flags = CPUIDLE_FLAG_TIME_VALID, .name = "C1", .desc = "MPU ON + CORE ON", }, { .enter = omap3_enter_idle_bm, - .exit_latency = 10 + 10, - .target_residency = 30, + .exit_latency = 165 + 88, + .target_residency = 345, .flags = CPUIDLE_FLAG_TIME_VALID, .name = "C2", .desc = "MPU ON + CORE ON", }, { .enter = omap3_enter_idle_bm, - .exit_latency = 50 + 50, - .target_residency = 300, + .exit_latency = 163 + 182, + .target_residency = 345, .flags = CPUIDLE_FLAG_TIME_VALID, .name = "C3", .desc = "MPU RET + CORE ON", }, { .enter = omap3_enter_idle_bm, - .exit_latency = 1500 + 1800, - .target_residency = 4000, + .exit_latency = 2852 + 605, + .target_residency = 150000, .flags = CPUIDLE_FLAG_TIME_VALID, .name = "C4", .desc = "MPU OFF + CORE ON", }, { .enter = omap3_enter_idle_bm, - .exit_latency = 2500 + 7500, - .target_residency = 12000, + .exit_latency = 800 + 366, + .target_residency = 2120, .flags = CPUIDLE_FLAG_TIME_VALID, .name = "C5", .desc = "MPU RET + CORE RET", }, { .enter = omap3_enter_idle_bm, - .exit_latency = 3000 + 8500, - .target_residency = 15000, + .exit_latency = 4080 + 801, + .target_residency = 215000, .flags = CPUIDLE_FLAG_TIME_VALID, .name = "C6", .desc = "MPU OFF + CORE RET", }, { .enter = omap3_enter_idle_bm, - .exit_latency = 10000 + 30000, - .target_residency = 30000, + .exit_latency = 4300 + 13000, + .target_residency = 215000, .flags = CPUIDLE_FLAG_TIME_VALID, .name = "C7", .desc = "MPU OFF + CORE OFF", -- 1.7.7.6 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
