This change adds the use of devfreq based clock scaling to MMC. Both eMMC and SD card can use it. For some workloads, such as video playback, it isn't necessary for these cards to run at high speed. Running at lower frequency, in such cases can still meet the deadlines for data transfers. Scaling down the clock frequency dynamically has power savings not only because the bus is running at lower frequency but also has an advantage of scaling down the system core voltage, if supported. Provide an ondemand clock scaling support similar to the cpufreq ondemand governor having two thresholds, up_threshold and down_threshold to decide whether to increase the frequency or scale it down respectively as per load. Sahitya Tummala (1): devfreq: Add new flag to do simple clock scaling Sayali Lokhande (6): mmc: core: devfreq: Add devfreq based clock scaling support mmc: core: Add sysfs entries for dynamic control of clock scaling mmc: core: add support for devfreq suspend/resume mmc: sdhci-msm: Kconfig: select devfreq ondemand for sdhci-msm mmc: sdhci-msm: Enable clock scaling property mmc: core: Add a debugfs entry to set max clock rate .../devicetree/bindings/mmc/sdhci-msm.txt | 10 + Documentation/mmc/mmc-dev-attrs.txt | 38 ++ drivers/devfreq/governor_simpleondemand.c | 25 +- drivers/mmc/core/core.c | 672 +++++++++++++++++++++ drivers/mmc/core/core.h | 9 + drivers/mmc/core/debugfs.c | 90 +++ drivers/mmc/core/host.c | 163 ++++- drivers/mmc/core/mmc.c | 227 ++++++- drivers/mmc/core/sd.c | 85 ++- drivers/mmc/host/Kconfig | 2 + drivers/mmc/host/sdhci-msm.c | 38 ++ drivers/mmc/host/sdhci-pltfm.c | 11 + drivers/mmc/host/sdhci.c | 27 + drivers/mmc/host/sdhci.h | 8 + include/linux/devfreq.h | 4 + include/linux/mmc/card.h | 5 + include/linux/mmc/host.h | 70 +++ 17 files changed, 1475 insertions(+), 9 deletions(-) -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
