On 13 July 2018 at 11:52, Sayali Lokhande <sayalil@xxxxxxxxxxxxxx> wrote: > 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 > Thanks for you patchse! Just wanted to let you know that I am current in holiday mode, so I needs some more time to review this properly. Apologize for the inconvenience. Kind regards Uffe -- 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
