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Raspberry Pi CPUFreq Driver & Other Power Management Work For Linux 5.3

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  • Raspberry Pi CPUFreq Driver & Other Power Management Work For Linux 5.3

    Phoronix: Raspberry Pi CPUFreq Driver & Other Power Management Work For Linux 5.3

    The power management changes for Linux 5.3 merge window don't offer any P-State changes or other prominent Intel changes this cycle but there is some other improvements as well as new CPUFreq drivers for CPU frequency scaling...

    http://www.phoronix.com/scan.php?pag...wer-Management

  • #2
    Typo:

    Originally posted by phoronix View Post
    allowing the UEFI BGRT to be overriden via initrd or configfs, and other fixes.
    (you said "and other fixes" before... don't you mean "and other changes"?)

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    • #3
      nice to see that running a mainline kernel on raspberry pi will finally be practical.

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      • #4
        Michael: would you be able to summary current Rasperry Pi upstream support state? Unfortunately there are not more updates coming from the Eric at https://anholt.github.io/twivc4/

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        • #5
          Originally posted by Zajec View Post
          Michael: would you be able to summary current Rasperry Pi upstream support state? Unfortunately there are not more updates coming from the Eric at https://anholt.github.io/twivc4/
          While not a blog, work happens here now https://gitlab.freedesktop.org/anholt

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          • #6
            Originally posted by -MacNuke- View Post
            While not a blog, work happens here now https://gitlab.freedesktop.org/anholt
            It seems to be mostly Mesa there, but that's something.

            I'm still wondering what's missing regarding other subsystems (like I didn't know about cpufreq until recently).

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            • #7
              Is Raspberry the only SBC with proper Linux support (mainline)? Thanks

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              • #8
                Do you count x86 SBC (like the Odroid H2)?
                There are 248 arm64 dts files in the kernel.
                There are 14 listed on Wikipedia https://en.wikipedia.org/wiki/Compar...erating_system

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                • #9
                  Originally posted by Zajec View Post
                  Michael: would you be able to summary current Rasperry Pi upstream support state? Unfortunately there are not more updates coming from the Eric at https://anholt.github.io/twivc4/
                  It's getting better. My guess is that you'd be able to boot a vanilla kernel. 4.19.57 has 708 patches on top of vanilla and 5.2.0 needs 298. Though I'm not sure how much of this is for the π 4. IIRC it used to be less patches.

                  https://github.com/raspberrypi/linux/commits/rpi-4.19.y
                  https://github.com/raspberrypi/linux/commits/rpi-5.2.y

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                  • #10
                    This is pretty cool. I hope rpi will be mainlined some day, and I won't have to pick between a modern kernel with armv8 support, or working SPI.

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