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Date: Wed, 8 Jan 2020 02:14:10 +0300
From: Dmitry Osipenko <digetx@...il.com>
To: Thierry Reding <thierry.reding@...il.com>,
Jonathan Hunter <jonathanh@...dia.com>,
Peter De Schrijver <pdeschrijver@...dia.com>,
"Rafael J. Wysocki" <rjw@...ysocki.net>,
Daniel Lezcano <daniel.lezcano@...aro.org>,
Michał Mirosław <mirq-linux@...e.qmqm.pl>
Cc: linux-pm@...r.kernel.org, linux-tegra@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v9 00/17] Consolidate and improve NVIDIA Tegra CPUIDLE
driver(s)
19.12.2019 00:04, Dmitry Osipenko пишет:
> Hello,
>
> This series does the following:
>
> 1. Unifies Tegra20/30/114 drivers into a single driver and moves it out
> into common drivers/cpuidle/ directory.
>
> 2. Preapres code for CPU cluster power-down idling state enabling on
> Tegra30.
>
> In the end there is a quite nice clean up of the Tegra CPUIDLE drivers
> and of the Tegra's arch code in general. Please review, thanks!
>
> WARNING!!! This series in made on top of CPUFreq patches [1]. The CPUFreq
> patches should be applied first, otherwise there will be a minor merge
> conflict in 'arch/arm/mach-tegra/tegra.c' because CPUFreq patches add a
> new simple-platform device for Tegra30 [2].
>
> [1] https://patchwork.ozlabs.org/project/linux-tegra/list/?series=149451
> [2] https://patchwork.ozlabs.org/patch/1212772/
>
> Changelog:
>
> v9: - Rebased on recent linux-next. Dropped the v8 "Avoid NULL dereference.."
> patch as a result, it's not needed anymore.
>
> - Temporarily dropped "cpuidle: tegra: Support CPU cluster power-down
> state on Tegra30" patch because Michał Mirosław reported that it causes
> problem for ASUS TF300T Tegra30 device, we'll have to resolve the
> problem first.
>
> - Added ACKs from Peter De Schrijver to the patches.
>
> v8: - Rebased on recent linux-next, now making use of
> cpuidle_driver_state_disabled(). Added new patch to make this new API
> usable by the updated Tegra cpuidle driver:
>
> cpuidle: Avoid NULL dereference in cpuidle_driver_state_disabled()
>
> - Added new patch to handle case where LP2 isn't available:
>
> cpuidle: tegra: Disable CC6 state if LP2 unavailable
>
> v7: - drivers/cpuidle/cpuidle-tegra.c now includes an explicit comment that
> clarifies the new terminology that is used for naming of the idling
> states. This change was suggested by Peter De Schrijver in the review
> comment to v6. See the comment to struct tegra_idle_driver in the code.
>
> - (!) This series is now based on top of the "NVIDIA Tegra20 CPUFreq
> driver major update" patchset. The conflict between these two series
> is trivial to resolve, but still it's worth to mention about that.
>
> v6: - Addressed request from Thierry Reding to change the way patches are
> organized by making changes in a more incremental manner.
>
> - tegra_sleep_cpu() now checks for the secondary CPUs to be offline
> in the "Make outer_disable() open-coded" patch.
>
> v5: - Rebased on a recent linux-next, fixed one minor conflict in Kconfig.
>
> - Improved commit's message of the "Support CPU cluster power-down state
> on Tegra30" patch.
>
> - The "Support CPU cluster power-down state on Tegra30" patch is also
> got split and now there is additional "Make outer_disable() open-coded"
> patch.
>
> - Made minor cosmetic changes to the "Introduce unified driver for
> NVIDIA Tegra SoCs" patch by improving error message and renaming
> one variable.
>
> v4: - Fixed compilation with !CONFIG_CACHE_L2X0 (and tested that it still
> works).
>
> - Replaced ktime_compare() with ktime_before() in the new driver,
> for consistency.
>
> v3: - Addressed review comments that were made by Jon Hunter to v2 by
> splitting patches into smaller (and simpler) chunks, better
> documenting changes in the commit messages and using proper error
> codes in the code.
>
> Warnings are replaced with a useful error messages in the code of
> "Introduce unified driver for NVIDIA Tegra SoCs" patch.
>
> Secondary CPUs parking timeout increased to 100ms because I found
> that it actually may happen to take more than 1ms if CPU is running
> on a *very* low frequency.
>
> Added diagnostic messages that are reporting Flow Controller state
> when CPU parking fails.
>
> Further polished cpuidle driver's code.
>
> The coupled state entering is now aborted if there is a pending SGI
> (Software Generated Interrupt) because it will be lost after GIC's
> power-cycling. Like it was done by the old Tegra20 CPUIDLE driver.
>
> v2: - Added patches to enable the new cpuidle driver in the defconfigs:
>
> ARM: multi_v7_defconfig: Enable Tegra cpuidle driver
> ARM: tegra: Enable Tegra cpuidle driver in tegra_defconfig
>
> - Dropped patches that removed CPUIDLE_FLAG_TIMER_STOP from the idling
> states because that flag actually doesn't have any negative effects,
> but still is correct for the case of a local CPU timer on older Tegra
> SoCs:
>
> cpuidle: tegra: Remove CPUIDLE_FLAG_TIMER_STOP from Tegra114/124 idle-state
> cpuidle: tegra: Remove CPUIDLE_FLAG_TIMER_STOP from all states
>
> - The "Add unified driver for NVIDIA Tegra SoCs" patch got more polish.
> Tegra30 and Terga114 states are now squashed into a single common C7
> state (following Parker TRM terminology, see 17.2.2.2 Power Management
> States), more comments added, etc minor changes.
>
> Dmitry Osipenko (17):
> ARM: tegra: Compile sleep-tegra20/30.S unconditionally
> ARM: tegra: Add tegra_pm_park_secondary_cpu()
> ARM: tegra: Remove pen-locking from cpuidle-tegra20
> ARM: tegra: Change tegra_set_cpu_in_lp2() type to void
> ARM: tegra: Propagate error from tegra_idle_lp2_last()
> ARM: tegra: Expose PM functions required for new cpuidle driver
> ARM: tegra: Rename some of the newly exposed PM functions
> ARM: tegra: Make outer_disable() open-coded
> arm: tegra20: cpuidle: Handle case where secondary CPU hangs on
> entering LP2
> arm: tegra20: cpuidle: Make abort_flag atomic
> arm: tegra20/30: cpuidle: Remove unnecessary memory barrier
> cpuidle: Refactor and move out NVIDIA Tegra20 driver into
> drivers/cpuidle
> cpuidle: tegra: Squash Tegra30 driver into the common driver
> cpuidle: tegra: Squash Tegra114 driver into the common driver
> cpuidle: tegra: Disable CC6 state if LP2 unavailable
> ARM: multi_v7_defconfig: Enable Tegra cpuidle driver
> ARM: tegra: Enable Tegra cpuidle driver in tegra_defconfig
>
> arch/arm/configs/multi_v7_defconfig | 1 +
> arch/arm/configs/tegra_defconfig | 1 +
> arch/arm/mach-tegra/Makefile | 19 +-
> arch/arm/mach-tegra/cpuidle-tegra114.c | 89 ----
> arch/arm/mach-tegra/cpuidle-tegra20.c | 212 ----------
> arch/arm/mach-tegra/cpuidle-tegra30.c | 132 ------
> arch/arm/mach-tegra/cpuidle.c | 50 ---
> arch/arm/mach-tegra/cpuidle.h | 21 -
> arch/arm/mach-tegra/irq.c | 3 +-
> arch/arm/mach-tegra/pm.c | 54 ++-
> arch/arm/mach-tegra/pm.h | 4 -
> arch/arm/mach-tegra/reset-handler.S | 11 -
> arch/arm/mach-tegra/reset.h | 9 +-
> arch/arm/mach-tegra/sleep-tegra20.S | 170 --------
> arch/arm/mach-tegra/sleep-tegra30.S | 6 +-
> arch/arm/mach-tegra/sleep.h | 15 -
> arch/arm/mach-tegra/tegra.c | 7 +-
> drivers/cpuidle/Kconfig.arm | 8 +
> drivers/cpuidle/Makefile | 1 +
> drivers/cpuidle/cpuidle-tegra.c | 389 ++++++++++++++++++
> include/soc/tegra/cpuidle.h | 2 +-
> .../mach-tegra => include/soc/tegra}/irq.h | 8 +-
> include/soc/tegra/pm.h | 31 ++
> 23 files changed, 482 insertions(+), 761 deletions(-)
> delete mode 100644 arch/arm/mach-tegra/cpuidle-tegra114.c
> delete mode 100644 arch/arm/mach-tegra/cpuidle-tegra20.c
> delete mode 100644 arch/arm/mach-tegra/cpuidle-tegra30.c
> delete mode 100644 arch/arm/mach-tegra/cpuidle.c
> delete mode 100644 arch/arm/mach-tegra/cpuidle.h
> create mode 100644 drivers/cpuidle/cpuidle-tegra.c
> rename {arch/arm/mach-tegra => include/soc/tegra}/irq.h (59%)
>
Hello Rafael and Daniel,
Could you please take a look at the CPUIDLE driver patches and ACK them
if they are okay to you? Then Thierry will be able to take this series
via Tegra tree. Thanks in advance!
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