Messages in this thread | | | Subject | Re: [RFC PATCH 0/3] Add support of busfreq | From | Alexandre Bailon <> | Date | Fri, 15 Mar 2019 10:31:40 +0100 |
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Hi Aisheng
On 3/15/19 3:39 AM, Aisheng Dong wrote: > +Jacky and Leonard, Ranjani > > Hi Alexandre, > >> From: Alexandre Bailon [mailto:abailon@baylibre.com] >> >> This series implements busfreq, a framework used in MXP's tree to scale the >> interconnect and dram frequencies. >> In the vendor tree, device's driver request for a performance level, which is >> used to scale the frequencies. >> This series implements it using the interconnect framework. >> Devices' driver request for bandwidth which is use by busfreq to determine a >> performance level, and then scale the frequency. >> >> Busfreq is quite generic. It could be used for any i.MX SoC. >> A busfreq platform driver just have to define a list of interconnect nodes, and >> some OPPs. >> > > It's really great to see this patch series. > And it should be the correct direction we're heading to upstream busfreq support. > >> This series is sent as RFC mostly because the current support of i.MX SoC won't >> benefit of busfreq framework, because the clocks' driver don't support >> interconnect / dram frequency scaling. >> As exemple, this series implements busfreq for i.MX8MM whose upstreaming >> is in progress. Because this relies on ATF to do the frequency scaling, it won't >> be hard make it work. >> > > How can I test this patch series? > Any additional patches you can share with us? > Or what else we need to do to test it? We can help with it. Many other patches will be required to test the series. There are a couple of patches that updates i.MX device drivers to request for bandwidth (does similar thing as bus_freq_request and bus_freq_release). In addition, a patch to that allow to scale the DRAM frequency using CCF is required. I'm still working on this patch. It works correctly on 4.14, but since I rebased it on linux-next/master, it stopped to work. I'm trying to fix it now. I will share all this patches ASAP.
Best Regards, Alexandre > > Regards > Dong Aisheng > >> As exemple, this series implements busfreq for Alexandre Bailon (3): >> drivers: interconnect: Add a driver for i.MX SoC >> drivers: interconnect: imx: Add support of i.MX8MM >> dt-bindings: interconnect: Document fsl,busfreq-imx8mm bindings >> >> .../bindings/interconnect/imx8mm.txt | 24 + >> drivers/interconnect/Kconfig | 1 + >> drivers/interconnect/Makefile | 1 + >> drivers/interconnect/imx/Kconfig | 17 + >> drivers/interconnect/imx/Makefile | 2 + >> drivers/interconnect/imx/busfreq-imx8mm.c | 132 ++++ >> drivers/interconnect/imx/busfreq.c | 570 >> ++++++++++++++++++ >> drivers/interconnect/imx/busfreq.h | 123 ++++ >> include/dt-bindings/interconnect/imx8mm.h | 37 ++ >> 9 files changed, 907 insertions(+) >> create mode 100644 >> Documentation/devicetree/bindings/interconnect/imx8mm.txt >> create mode 100644 drivers/interconnect/imx/Kconfig create mode >> 100644 drivers/interconnect/imx/Makefile create mode 100644 >> drivers/interconnect/imx/busfreq-imx8mm.c >> create mode 100644 drivers/interconnect/imx/busfreq.c >> create mode 100644 drivers/interconnect/imx/busfreq.h >> create mode 100644 include/dt-bindings/interconnect/imx8mm.h >> >> -- >> 2.19.2
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