[PATCH v6 00/18] Consolidate and improve NVIDIA Tegra CPUIDLE driver(s)

From: Dmitry Osipenko
Date: Tue Oct 15 2019 - 13:01:44 EST


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. Enables CPU cluster power-down idling state 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!


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"

- 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

- 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

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 Power Management
States), more comments added, etc minor changes.

Dmitry Osipenko (18):
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
clk: tegra: Add missing stubs for the case of !CONFIG_PM_SLEEP
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 NVIDIA Tegra20 driver into drivers/cpuidle/
cpuidle: tegra: Squash Tegra30 driver into the common driver
cpuidle: tegra: Support CPU cluster power-down state on Tegra30
cpuidle: tegra: Squash Tegra114 driver into the common driver
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 | 357 ++++++++++++++++++
include/linux/clk/tegra.h | 13 +
include/soc/tegra/cpuidle.h | 2 +-
.../mach-tegra => include/soc/tegra}/irq.h | 8 +-
include/soc/tegra/pm.h | 31 ++
24 files changed, 463 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%)