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Message-ID: <540D9A3F.2000807@smartplayin.com> Date: Mon, 08 Sep 2014 17:29:59 +0530 From: Pramod Gurav <pramod.gurav@...rtplayin.com> To: Stephen Boyd <sboyd@...eaurora.org> CC: Mike Turquette <mturquette@...aro.org>, linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, Viresh Kumar <viresh.kumar@...aro.org>, linux-pm@...r.kernel.org Subject: Re: [PATCH v2 00/15] Krait clocks + Krait CPUfreq Sorry Stephen for spaming. I read the full patch cover letter and found your note. Somehow I missed on that. Thanks Pramod On Monday 08 September 2014 03:12 PM, Pramod Gurav wrote: > Hi Stephen, > Looks like one patch is missing from v1. Is this removed from v2 > patchset from some reason? > ARM: Add Krait L2 register accessor functions > > But there are references to this in v2 set and build fails while > compiling drivers/clk/qcom/clk-krait.c. > > Thanks and Regards > Pramod > > On Saturday 06 September 2014 04:17 AM, Stephen Boyd wrote: >> These patches provide cpufreq scaling on devices with Krait CPUs. >> In Krait CPU designs there's one PLL and two muxes per CPU, allowing >> us to switch CPU frequencies independently. >> >> secondary >> +-----+ + >> | QSB |-------+------------|\ >> +-----+ | | |-+ >> | +-------|/ | >> | | + | >> +-----+ | | | >> | PLL |----+-------+ | primary >> +-----+ | | | + >> | | +-----|\ +------+ >> +-------+ | | | \ | | >> | HFPLL |----------+-----------------| |-----| CPU0 | >> +-------+ | | | | | | | >> | | | +-----+ | / +------+ >> | | +-| / 2 |---------|/ >> | | +-----+ + >> | | secondary >> | | + >> | +------------|\ >> | | |-+ >> +---------------|/ | primary >> + | + >> +-----|\ +------+ >> +-------+ | \ | | >> | HFPLL |----------------------------| |-----| CPU1 | >> +-------+ | | | | | >> | +-----+ | / +------+ >> +-| / 2 |---------|/ >> +-----+ + >> >> To support this in the common clock framework we model the muxes, >> dividers, and PLLs as different clocks. CPUfreq only interacts >> with the primary mux (farthest right in the diagram). When CPUfreq >> sets a rate, the mux code finds the best parent that can provide the rate. >> Due to the design, QSB and the top PLL are always a fixed rate and thus >> only support one frequency each. These sources provide the lowest >> frequencies for the CPUs. The HFPLLs are where we can make the CPU go >> faster (GHz range). Sometimes we need to run the HFPLL twice as >> fast and divide it by two to get a particular frequency. >> >> When switching rates we can't leave the CPU clocked by the HFPLL because >> we need to turn off the output of the PLL when changing its frequency. >> This means we have to switch over to the secondary mux and use one of the >> fixed sources. This is why we need something like the safe parent patch. >> >> I plan to submit the DTS changes through arm-soc, but I've included everything >> here to make it easier to pick things up for testing, etc. Please note >> that these patches rely on the Krait L2 accessor patch I posted a while back >> in another series[1]. This also relies on the cpufreq-generic patchset from >> Viresh[2]. If anything can be picked up right now it would be better >> to reduce the churn over time as other pieces settle. The series gets >> progressively more controversial as it goes on, so I hope that things >> near the beggining will be picked up earlier. >> >> Changes since v1: >> * Added IPQ and APQ8064 support >> * Switched to cpufreq-generic >> * Added OPP parsing from DT (need to write binding though) >> * New patches to make clk-generic.c go away >> * Made mux and divider reusable for non-MMIO devices >> * Added a mux_determine_rate_closest (not sure if this is really needed) >> * Added unregistration of muxes >> * New patch to avoid sending high frequencies down to devices using clocks >> >> TODO: >> * Add Krait regulator voltage scaling (not strictly necessary) >> * Document DT bindings >> * Use a new efuse/eeprom API instead of hardcoding the location in the driver >> * Add some thermal awareness >> >> >> Stephen Boyd (15): >> clk: mux: Add unregistration API >> clk: mux: Split out register accessors for reuse >> clk: Add __clk_mux_determine_rate_closest >> clk: divider: Make generic for usage elsewhere >> clk: Add safe switch hook >> clk: Avoid sending high rates to downstream clocks during set_rate >> clk: qcom: Add support for High-Frequency PLLs (HFPLLs) >> clk: qcom: Add HFPLL driver >> clk: qcom: Add MSM8960/APQ8064's HFPLLs >> clk: qcom: Add IPQ806X's HFPLLs >> clk: qcom: Add support for Krait clocks >> clk: qcom: Add KPSS ACC/GCC driver >> clk: qcom: Add Krait clock controller driver >> cpufreq: Add module to register cpufreq on Krait CPUs >> ARM: dts: qcom: Add necessary DT data for Krait cpufreq >> >> arch/arm/boot/dts/qcom-apq8064.dtsi | 230 +++++++++++++++++ >> arch/arm/boot/dts/qcom-msm8960.dtsi | 49 ++++ >> arch/arm/boot/dts/qcom-msm8974.dtsi | 311 ++++++++++++++++++++++- >> drivers/clk/clk-divider.c | 197 +++++++++------ >> drivers/clk/clk-mux.c | 91 ++++--- >> drivers/clk/clk.c | 133 +++++++--- >> drivers/clk/qcom/Kconfig | 28 +++ >> drivers/clk/qcom/Makefile | 5 + >> drivers/clk/qcom/clk-hfpll.c | 253 +++++++++++++++++++ >> drivers/clk/qcom/clk-hfpll.h | 54 ++++ >> drivers/clk/qcom/clk-krait.c | 166 +++++++++++++ >> drivers/clk/qcom/clk-krait.h | 49 ++++ >> drivers/clk/qcom/gcc-ipq806x.c | 83 +++++++ >> drivers/clk/qcom/gcc-msm8960.c | 172 +++++++++++++ >> drivers/clk/qcom/hfpll.c | 110 +++++++++ >> drivers/clk/qcom/kpss-xcc.c | 94 +++++++ >> drivers/clk/qcom/krait-cc.c | 357 +++++++++++++++++++++++++++ >> drivers/cpufreq/Kconfig.arm | 9 + >> drivers/cpufreq/Makefile | 1 + >> drivers/cpufreq/qcom-cpufreq.c | 199 +++++++++++++++ >> include/dt-bindings/clock/qcom,gcc-msm8960.h | 2 + >> include/linux/clk-private.h | 2 + >> include/linux/clk-provider.h | 32 ++- >> 23 files changed, 2486 insertions(+), 141 deletions(-) >> create mode 100644 drivers/clk/qcom/clk-hfpll.c >> create mode 100644 drivers/clk/qcom/clk-hfpll.h >> create mode 100644 drivers/clk/qcom/clk-krait.c >> create mode 100644 drivers/clk/qcom/clk-krait.h >> create mode 100644 drivers/clk/qcom/hfpll.c >> create mode 100644 drivers/clk/qcom/kpss-xcc.c >> create mode 100644 drivers/clk/qcom/krait-cc.c >> create mode 100644 drivers/cpufreq/qcom-cpufreq.c >> >> [1] http://lkml.iu.edu/hypermail/linux/kernel/1404.0/02636.html >> [2] git://git.linaro.org/people/viresh.kumar/linux cpufreq/cpu0-krait-v3 >> > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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