Hello, This series addresses some additional review comments that were made by Thierry Reding to [1], makes several important changes to the driver, fixing excessive interrupts activity, and adds new features. In the end I'm proposing myself as a maintainer for the Tegra devfreq drivers. [1] https://lore.kernel.org/lkml/0fb50eb1-a173-1756-6889-2526a10ac707@xxxxxxxxx/T/ Changelog: v6: Addressed review comment that was made by Chanwoo Choi to v5 by squashing "Define ACTMON_DEV_CTRL_STOP" patch into the "Use CPUFreq notifier" patch. v5: Addressed review comments that were made by Chanwoo Choi to v4 by squashing few patches, dropping some questionable patches, rewording comments to the code, restructuring the code and etc. These patches are now dropped from the series: PM / devfreq: tegra30: Use tracepoints for debugging PM / devfreq: tegra30: Inline all one-line functions The interrupt-optimization patches are squashed into a single patch: PM / devfreq: tegra30: Reduce unnecessary interrupts activity because it's better to keep the optimizations as a separate change and this also helps to reduce code churning, since the code changes depend on a previous patch in order to stay cleaner. Fixed a lockup bug that I spotted recently, which is caused by a clk-notifier->cpufreq_get()->clk_set_rate() sequence. Now a non-blocking variant of CPU's frequency retrieving is used, i.e. cpufreq_quick_get(). Further optimized the CPUFreq notifier by postponing the delayed updating in accordance to the polling interval, this actually uncovered the above lockup bug. Implemented new minor driver feature in the new patch: PM / devfreq: tegra30: Support variable polling interval v4: Added two new patches to the series: PM / devfreq: tegra30: Synchronize average count on target's update PM / devfreq: tegra30: Increase sampling period to 16ms The first patch addresses problem where governor could get stuck due to outdated "average count" value which is snapshoted by ISR and there are cases where manual update of the value is required. The second patch is just a minor optimization. v3: Added support for tracepoints, replacing the debug messages. Fixed few more bugs with the help of tracepoints. New patches in this version: PM / devfreq: tegra30: Use tracepoints for debugging PM / devfreq: tegra30: Optimize CPUFreq notifier PM / devfreq: tegra30: Optimize upper consecutive watermark selection PM / devfreq: tegra30: Optimize upper average watermark selection PM / devfreq: tegra30: Include appropriate header Some of older patches of this series also got some extra minor polish. v2: Added more patches that are cleaning driver's code further and squashing another kHz conversion bug. The patch "Rework frequency management logic" of the v1 series is now converted to "Set up watermarks properly" because I found some problems in the original patch and then realized that there is no need to change the logic much. So the logic mostly preserved and only got improvements. The series is based on the today's linux-next (25 Jun) and takes into account minor changes that MyungJoo Ham made to the already queued patches from the first batch [1]. Dmitry Osipenko (19): PM / devfreq: tegra30: Change irq type to unsigned int PM / devfreq: tegra30: Keep interrupt disabled while governor is stopped PM / devfreq: tegra30: Handle possible round-rate error PM / devfreq: tegra30: Drop write-barrier PM / devfreq: tegra30: Set up watermarks properly PM / devfreq: tegra30: Tune up boosting thresholds PM / devfreq: tegra30: Fix integer overflow on CPU's freq max out PM / devfreq: tegra30: Ensure that target freq won't overflow PM / devfreq: tegra30: Use kHz units uniformly in the code PM / devfreq: tegra30: Reduce unnecessary interrupts activity PM / devfreq: tegra30: Use CPUFreq notifier PM / devfreq: tegra30: Move clk-notifier's registration to governor's start PM / devfreq: tegra30: Reset boosting on startup PM / devfreq: tegra30: Don't enable consecutive-down interrupt on startup PM / devfreq: tegra30: Constify structs PM / devfreq: tegra30: Include appropriate header PM / devfreq: tegra30: Increase sampling period to 16ms PM / devfreq: tegra30: Support variable polling interval PM / devfreq: tegra20/30: Add Dmitry as a maintainer MAINTAINERS | 9 + drivers/devfreq/tegra30-devfreq.c | 706 +++++++++++++++++++++++------- 2 files changed, 555 insertions(+), 160 deletions(-) -- 2.22.0
