linaro-dev March 2012

linaro-dev@lists.linaro.org

152 participants
126 discussions

[PATCH v3 0/4] OMAP serial device tree support

by Rajendra Nayak

v3 is rebased on top of the latest serial runtime patches[1] and boot tested with/without DT on OMAP4 SDP and OMAP4 Panda boards. Patches can be found here.. git://gitorious.org/omap-pm/linux.git for-dt/serial I also had to pull in a fix[2] for DT testing (already in linux-omap master) which was missing as the serial runtime branch[1] was based on an older master commit. Changes in v3: -1- Rebased on latest serial runtime patches -2- Minor typr fixes Changes in v2: -1- Got rid of binding to define which uart is console -2- Added checks to default clock speed to 48Mhz -3- Added compatible for each OMAP family -4- Used of_alias_get_id to populate port.line [1] git://gitorious.org/runtime_3-0/runtime_3-0.git for_3_3/lo_rc4_uartruntime [2] http://www.spinics.net/lists/arm-kernel/msg150751.html Rajendra Nayak (4): omap-serial: Get rid of all pdev->id usage omap-serial: Use default clock speed (48Mhz) if not specified omap-serial: Add minimal device tree support ARM: omap: pass minimal SoC/board data for UART from dt .../devicetree/bindings/serial/omap_serial.txt | 10 +++ arch/arm/boot/dts/omap3.dtsi | 31 ++++++++ arch/arm/boot/dts/omap4.dtsi | 28 +++++++ arch/arm/mach-omap2/board-generic.c | 1 - drivers/tty/serial/omap-serial.c | 80 +++++++++++++++---- 5 files changed, 132 insertions(+), 18 deletions(-) create mode 100644 Documentation/devicetree/bindings/serial/omap_serial.txt

12 years

[RFC] Scheduler recorder and playback

by Pantelis Antoniou

Hi there, There's considerable activity in the subject of the scheduler lately and how to adapt it to the peculiarities of the new class of hardware coming out lately, like the big.LITTLE class of devices from a number of manufacturers. The platforms that Linux runs are very diverse, and run differing workloads. For example most consumer devices will very likely run something like Android, with common use cases such as audio and/or video playback. Methods to achieve lower power consumption using a power aware scheduler are under investigation. Similarly for server applications, or VM hosting, the behavior of the scheduler shouldn't have adverse performance implications; any power saving on top of that would be a welcome improvement. The current issue is that scheduler development is not easily shared between developers. Each developer has their own 'itch', be it Android use cases, server workloads, VM, etc. The risk is high of optimizing for one's own use case and causing severe degradation on most other use cases. One way to fix this problem would be the development of a method with which one could perform a given use-case workload in a host, record the activity in a interchangeable portable trace format file, and then play it back on another host via a playback application that will generate an approximately similar load which was observed during recording. The way that the two hosts respond under the same load generated by the playback application can be compared, so that the performance of the two scheduler implementations measured in various metrics (like performance, power consumption etc.) can be evaluated. The fidelity of the this approximation is of great importance but it is debatable if it is possible to have a fully identical load generated, since details of the hosts might differ in such a way that such a thing is impossible. I believe that it should be possible at least to simulate a purely CPU load, and the blocking behavior of tasks, in such a way that it would result in scheduler decisions that can be compared and shared among developers. The recording part I believe can be handled by the kernel's tracing infrastructure, either by using the existing tracepoints, or need be adding more; possibly even creating a new tracer solely for this purpose. Since some applications can adapt their behavior according to insufficient system resources (think media players that can drop frames for example), I think it would be beneficial to record such events to the same trace file. The trace file should have a portable format so that it can be freely shared between developers. An ASCII format like we currently use should be OK, as long as it doesn't cause too much of an effect during execution of the recording. The playback application can be implemented via two ways. One way, which is the LinSched way would be to have the full scheduler implementation compiled as part of said application, and use application specific methods to evaluate performance. While this will work, it won't allow comparison of the two hosts in a meaningful manner. For both scheduler and platform evaluation, the playback application will generate the load on the running host by simulating the source host's recorded work load session. That means emulating process activity like forks, thread spawning, blocking on resources etc. It is not clear to me yet if that's possible without using some kind of kernel level helper module, but not requiring such is desirable. Since one would have the full trace of scheduling activity: past, present and future; there would be the possibility of generating a perfect schedule (as defined by best performance, or best power consumption), and use it as a yardstick of evaluation against the actual scheduler. Comparing the results, you would get an estimate of the best case improvement that could be achieved if the ideal scheduler existed. I know this is a bit long, but I hope this can be a basis of thinking on how to go about developing this. Regards -- Pantelis

12 years

Re: Config fragment for Versatile Express [ was: [RFC] First pass config fragment breakout for linaro kernel]

by John Stultz

On 03/29/2012 02:22 AM, Jon Medhurst (Tixy) wrote: > On Mon, 2012-03-26 at 12:20 -0700, John Stultz wrote: >> So after talking about it at the last Linaro Connect, I've finally >> gotten around to making a first pass at providing config fragments for >> the linaro kernel. I'd like to propose merging this for 12.04, and >> doing so early so we can make sure that all the desired config options >> are present in the fragments and to allow the vairous linaro build >> systems to begin migrating their config generation over. >> >> The current tree is here: >> >> http://git.linaro.org/gitweb?p=people/jstultz/android.git;a=shortlog;h=refs… >> > [...] >> I'd ask Landing teams to take a look at this, and report any missing >> config options or fragment chunks they'd like to see. > John, I've attached a config fragment for Versatile Express. Great! I've merged that in! There's a few warnings though: Value requested for CONFIG_ARCH_VEXPRESS_DT not in final .config Requested value: CONFIG_ARCH_VEXPRESS_DT=y Actual value: Value requested for CONFIG_FB_ARMHDLCD not in final .config Requested value: CONFIG_FB_ARMHDLCD=y Actual value: I'm guessing these are features not in the base 3.3 tree? If so you might want to break those out and re-add them with those patches. > This includes loadable module support because one of our topic branches > adds the gator module with a default config of 'm'. I did this because > Linaro kernels are expected to have this module available but I didn't > see any reason for it to be built-in, and as there may be versioning > issues between it and the separate user side daemon, I thought it wise > to keep the door open for loading an alternate module obtained from > elsewhere. That decision does mean that all Linaro kernels would need > loadable module support built in, but I don't think that is a bad idea. > Tushar had similar request, but I don't think the android configs (at least the ones I've managed) use modules, so I've added the MODULES=y to the common ubuntu.conf file. If this is still objectionable, it can be changed and we can push it down to the linaro-base.conf, but I want to make sure the Android tree doesn't run into trouble. thanks -john

12 years, 1 month

Re: Wanted: superstar hacker to complete Mono port to armhf

by Hector Oron

Hello Jo, I am forwarding the message to a couple mailing lists which might have people interested on the Mono porting for ARM hard-float ABI. 2012/2/2 Jo Shields <directhex(a)apebox.org>: > Right now, Mono is available in Debian armhf. This is a hack - what > we're actually doing is building Mono as an armhf binary, but built to > emit soft VFP instructions and using calling conventions and ABI for > armel. This hack works well enough for pure cross-platform code (like > the C# compiler) to run, but dies in a heap for anything complex. > > This situation is a bit on the crappy side of crap. > > In order for Mono on armhf not to be a waste of time, a "true" port > needs to be completed. If I were to make a not-remotely-educated guess, > I'd say it needs about 550 lines of changes, primarily the addition of > code to emit the correct instructions feeling the correct registers in > mono/mini/mini-arm.c plus a couple of tweaks to related headers. > > Upstream have also indicated that they're happy to provide guidance and > pointers on how to implement this port, although they're unable to > provide the requisite code themselves. > > Sadly, unless someone in the community is able to step forward and > contribute here, it's only a matter of time before the armhf packages > are rightfully marked RC-buggy, and 100+ packages need to be axed from > armhf. This would make me sad. -- Héctor Orón -.. . -... .. .- -. -.. . ...- . .-.. --- .--. . .-.

12 years, 1 month

[PATCH 0/4] thermal: Adding generic cpu cooling devices

by Amit Daniel Kachhap

Changes since RFC: *Changed the cpu cooling registration/unregistration API's to instance based *Changed the STATE_ACTIVE trip type to pass correct instance id *Adding support to restore back the policy->max_freq after doing frequency clipping. *Moved the trip cooling stats from sysfs node to debugfs node as suggested by Greg KH greg(a)kroah.com *Incorporated several review comments from eduardo.valentin(a)ti.com Todo: *Report time spent in each trip point along with the cooling statistics *Add opp library support in cpufreq cooling api's Brief Description: 1) The generic cooling devices code is placed inside driver/thermal/* as placing inside acpi folder will need un-necessary enabling of acpi code. 2) This patchset adds a new trip type THERMAL_TRIP_STATE_ACTIVE which passes cooling device instance number and may be helpful for cpufreq cooling devices to take the correct cooling action. 3) This patchset adds generic cpu cooling low level implementation through frequency clipping and cpu hotplug. In future, other cpu related cooling devices may be added here. An ACPI version of this already exists (drivers/acpi/processor_thermal.c). But this will be useful for platforms like ARM using the generic thermal interface along with the generic cpu cooling devices. The cooling device registration API's return cooling device pointers which can be easily binded with the thermal zone trip points. 4)This patchset provides a simple way of reporting cooling achieved in a trip type. This will help in fine cooling the cooling devices attached. Amit Daniel Kachhap (4): thermal: Add a new trip type to use cooling device instance number thermal: Add generic cpufreq cooling implementation thermal: Add generic cpuhotplug cooling implementation thermal: Add support to report cooling statistics achieved by cooling devices Documentation/thermal/cpu-cooling-api.txt | 57 ++++ Documentation/thermal/sysfs-api.txt | 4 +- drivers/thermal/Kconfig | 11 + drivers/thermal/Makefile | 1 + drivers/thermal/cpu_cooling.c | 484 +++++++++++++++++++++++++++++ drivers/thermal/thermal_sys.c | 165 ++++++++++- include/linux/cpu_cooling.h | 71 +++++ include/linux/thermal.h | 14 + 8 files changed, 802 insertions(+), 5 deletions(-) create mode 100644 Documentation/thermal/cpu-cooling-api.txt create mode 100644 drivers/thermal/cpu_cooling.c create mode 100644 include/linux/cpu_cooling.h

12 years, 1 month

Building Linaro Android from source and replacing the kernel in an Linaro Android build

by Zach Pfeffer

I get these questions a lot so I wrote some blog posts with the exact steps I used. http://www.linaro.org/linaro-blog/2011/09/15/switching-out-a-pre-built-andr… http://www.linaro.org/linaro-blog/2011/09/15/%EF%BB%BFbuilding-a-linaro-and… Enjoy! -- Zach Pfeffer Android Platform Team Lead, Linaro Platform Teams Linaro.org | Open source software for ARM SoCs Follow Linaro: http://www.facebook.com/pages/Linaro http://twitter.com/#!/linaroorg - http://www.linaro.org/linaro-blog

12 years, 1 month

[PATCH v2] EXYNOS: Rename exynos5_tzpc structure to exynos_tzpc

by Chander Kashyap

TZPC IP is common across Exynos based SoC'c. Renaming exynos5_tzpc in arch/arm/include/asm/arch-exynos/tzpc.h to exynos_tzpc will allow generic usase of tzpc. Also modify board/samsung/smdk5250/tzpc_init.c to use exynos_tzpc. Signed-off-by: Chander Kashyap <chander.kashyap(a)linaro.org> --- Changes in V2: - Renaming is changed from s5p_ctzpc to exynos_tzpc as per Kyungmin's Comments. arch/arm/include/asm/arch-exynos/tzpc.h | 2 +- board/samsung/smdk5250/tzpc_init.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/arm/include/asm/arch-exynos/tzpc.h b/arch/arm/include/asm/arch-exynos/tzpc.h index 2c9a07b..c5eb4b1 100644 --- a/arch/arm/include/asm/arch-exynos/tzpc.h +++ b/arch/arm/include/asm/arch-exynos/tzpc.h @@ -22,7 +22,7 @@ #define __TZPC_H_ #ifndef __ASSEMBLY__ -struct exynos5_tzpc { +struct exynos_tzpc { unsigned int r0size; char res1[0x7FC]; unsigned int decprot0stat; diff --git a/board/samsung/smdk5250/tzpc_init.c b/board/samsung/smdk5250/tzpc_init.c index c2ccef3..f39bd55 100644 --- a/board/samsung/smdk5250/tzpc_init.c +++ b/board/samsung/smdk5250/tzpc_init.c @@ -28,7 +28,7 @@ /* Setting TZPC[TrustZone Protection Controller] */ void tzpc_init(void) { - struct exynos5_tzpc *tzpc; + struct exynos_tzpc *tzpc; unsigned int addr; for (addr = TZPC0_BASE; addr <= TZPC9_BASE; addr += TZPC_BASE_OFFSET) { -- 1.7.5.4

12 years, 1 month

[PATCH v2] ARM: dts: imx6q: add anatop regulators

by Ying-Chun Liu (PaulLiu)

From: "Ying-Chun Liu (PaulLiu)" <paul.liu(a)linaro.org> Add anatop regulators to imx6q.dtsi for all imx6q platforms. Signed-off-by: Ying-Chun Liu (PaulLiu) <paul.liu(a)linaro.org> Signed-off-by: Richard Zhao <richard.zhao(a)linaro.org> Cc: Shawn Guo <shawn.guo(a)linaro.org> --- arch/arm/boot/dts/imx6q.dtsi | 86 ++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 86 insertions(+), 0 deletions(-) diff --git a/arch/arm/boot/dts/imx6q.dtsi b/arch/arm/boot/dts/imx6q.dtsi index 263e8f3..79f59e7 100644 --- a/arch/arm/boot/dts/imx6q.dtsi +++ b/arch/arm/boot/dts/imx6q.dtsi @@ -346,6 +346,92 @@ compatible = "fsl,imx6q-anatop"; reg = <0x020c8000 0x1000>; interrupts = <0 49 0x04 0 54 0x04 0 127 0x04>; + #address-cells = <1>; + #size-cells = <0>; + + regulator-1p1@110 { + compatible = "fsl,anatop-regulator"; + regulator-name = "vdd1p1"; + regulator-min-microvolt = <800000>; + regulator-max-microvolt = <1375000>; + regulator-always-on; + anatop-reg-offset = <0x110>; + anatop-vol-bit-shift = <8>; + anatop-vol-bit-width = <5>; + anatop-min-bit-val = <4>; + anatop-min-voltage = <800000>; + anatop-max-voltage = <1375000>; + }; + + regulator-3p0@120 { + compatible = "fsl,anatop-regulator"; + regulator-name = "vdd3p0"; + regulator-min-microvolt = <2800000>; + regulator-max-microvolt = <3150000>; + regulator-always-on; + anatop-reg-offset = <0x120>; + anatop-vol-bit-shift = <8>; + anatop-vol-bit-width = <5>; + anatop-min-bit-val = <0>; + anatop-min-voltage = <2625000>; + anatop-max-voltage = <3400000>; + }; + + regulator-2p5@130 { + compatible = "fsl,anatop-regulator"; + regulator-name = "vdd2p5"; + regulator-min-microvolt = <2000000>; + regulator-max-microvolt = <2750000>; + regulator-always-on; + anatop-reg-offset = <0x130>; + anatop-vol-bit-shift = <8>; + anatop-vol-bit-width = <5>; + anatop-min-bit-val = <0>; + anatop-min-voltage = <2000000>; + anatop-max-voltage = <2750000>; + }; + + regulator-vddcore@140 { + compatible = "fsl,anatop-regulator"; + regulator-name = "cpu"; + regulator-min-microvolt = <725000>; + regulator-max-microvolt = <1450000>; + regulator-always-on; + anatop-reg-offset = <0x140>; + anatop-vol-bit-shift = <0>; + anatop-vol-bit-width = <5>; + anatop-min-bit-val = <1>; + anatop-min-voltage = <725000>; + anatop-max-voltage = <1450000>; + }; + + regulator-vddpu@140 { + compatible = "fsl,anatop-regulator"; + regulator-name = "vddpu"; + regulator-min-microvolt = <725000>; + regulator-max-microvolt = <1450000>; + regulator-always-on; + anatop-reg-offset = <0x140>; + anatop-vol-bit-shift = <9>; + anatop-vol-bit-width = <5>; + anatop-min-bit-val = <1>; + anatop-min-voltage = <725000>; + anatop-max-voltage = <1450000>; + }; + + regulator-vddsoc@140 { + compatible = "fsl,anatop-regulator"; + regulator-name = "vddsoc"; + regulator-min-microvolt = <725000>; + regulator-max-microvolt = <1450000>; + regulator-always-on; + anatop-reg-offset = <0x140>; + anatop-vol-bit-shift = <18>; + anatop-vol-bit-width = <5>; + anatop-min-bit-val = <1>; + anatop-min-voltage = <725000>; + anatop-max-voltage = <1450000>; + }; }; usbphy@020c9000 { /* USBPHY1 */ -- 1.7.9.1

12 years, 1 month

[PATCH 0/2] change lpj in arm smp common code

by Richard Zhao

The two patches were originally in [PATCH V6 0/7] add a generic cpufreq driver. I seperated them and hope they can go to upstream earlier. Richard Zhao (2): ARM: add cpufreq transiton notifier to adjust loops_per_jiffy for smp cpufreq: OMAP: remove loops_per_jiffy recalculate for smp arch/arm/kernel/smp.c | 54 ++++++++++++++++++++++++++++++++++++++++ drivers/cpufreq/omap-cpufreq.c | 36 -------------------------- 2 files changed, 54 insertions(+), 36 deletions(-) -- 1.7.5.4

12 years, 1 month

[RFC] First pass config fragment breakout for linaro kernel

by John Stultz

So after talking about it at the last Linaro Connect, I've finally gotten around to making a first pass at providing config fragments for the linaro kernel. I'd like to propose merging this for 12.04, and doing so early so we can make sure that all the desired config options are present in the fragments and to allow the vairous linaro build systems to begin migrating their config generation over. The current tree is here: http://git.linaro.org/gitweb?p=people/jstultz/android.git;a=shortlog;h=refs… The most relevant commit being: http://git.linaro.org/gitweb?p=people/jstultz/android.git;a=commitdiff;h=da… This includes config fragments for a linaro-base, an android-ization fragment, and board configs for panda, origen and imx53. I suspect we'll need an ubuntu specific fragment as well as all the other board fragments. There is likely to be quite a bit of churn as we decide what sort of configs are really common and which are board specific. But that's ok. Configs are generated from the config fragments, as follows: ./scripts/kconfig/merge_config.sh ./configs/linaro-base.conf ./configs/android.conf ./configs/panda.conf You may see warnings, which are not fatal, but should be reported so they can be properly cleaned up. I'm asking for Build folks to take a look at the above and consider how they might merge in fragment assembly into their system replacing their current config generation. I'd ask Landing teams to take a look at this, and report any missing config options or fragment chunks they'd like to see. thanks -john

12 years, 1 month

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linaro-dev March 2012