Re: [PATCH] clk: tegra: mark TEGRA210_CLK_DBGAPB as always on

From	Geert Uytterhoeven <geert@linux-m68k.org>
Newsgroups	linux.kernel
Subject	Re: [PATCH] clk: tegra: mark TEGRA210_CLK_DBGAPB as always on
Date	2017-03-08 12:50 +0100
Message-ID	<tiIgq-5ZP-13@gated-at.bofh.it> (permalink)
References	(2 earlier) <thWls-5tJ-17@gated-at.bofh.it> <thXKy-6FK-19@gated-at.bofh.it> <ti1XQ-146-39@gated-at.bofh.it> <ti49j-2x3-11@gated-at.bofh.it> <tiHX4-5QO-9@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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Hi Jon,

On Wed, Mar 8, 2017 at 11:13 AM, Jon Hunter <jonathanh@nvidia.com> wrote:
>> I had a similar issue with SH-Mobile AG5, where the power domain containing
>> the JTAG interface is powered down.
>
> This reminds me, does your patch assume that the DFD power domain is
> enabled? I am guessing that it needs to be for JTAG to work.

Yes. The pm-rmobile driver looks for "arm,coresight-etm3x" devices, and
marks the corresponding PM Domain as always-on, as long as the
Coresight code doesn't handle runtime PM.

For R-Mobile A1 and APE6 I already have added such device nodes, as any access
to a debug register hangs when the debug power domain is powered down.
For SH-Mobile AG5, I hadn't, as the debug power domain needs to be powered
for JTAG functionality only.

For the latter, perhaps we also need a command line parameter to change
a device status from "disabled" to "enabled"?

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Thread

Re: [PATCH] clk: tegra: mark TEGRA210_CLK_DBGAPB as always on Jon Hunter <jonathanh@nvidia.com> - 2017-03-02 22:30 +0100
  Re: [PATCH] clk: tegra: mark TEGRA210_CLK_DBGAPB as always on Peter De Schrijver <pdeschrijver@nvidia.com> - 2017-03-06 09:40 +0100
    Re: [PATCH] clk: tegra: mark TEGRA210_CLK_DBGAPB as always on Jon Hunter <jonathanh@nvidia.com> - 2017-03-06 11:10 +0100
      Re: [PATCH] clk: tegra: mark TEGRA210_CLK_DBGAPB as always on Peter De Schrijver <pdeschrijver@nvidia.com> - 2017-03-06 15:40 +0100
        Re: [PATCH] clk: tegra: mark TEGRA210_CLK_DBGAPB as always on Jon Hunter <jonathanh@nvidia.com> - 2017-03-06 17:00 +0100
        Re: [PATCH] clk: tegra: mark TEGRA210_CLK_DBGAPB as always on Geert Uytterhoeven <geert@linux-m68k.org> - 2017-03-06 18:00 +0100
          Re: [PATCH] clk: tegra: mark TEGRA210_CLK_DBGAPB as always on Jon Hunter <jonathanh@nvidia.com> - 2017-03-07 21:30 +0100
            Re: [PATCH] clk: tegra: mark TEGRA210_CLK_DBGAPB as always on Geert Uytterhoeven <geert@linux-m68k.org> - 2017-03-08 11:20 +0100
          Re: [PATCH] clk: tegra: mark TEGRA210_CLK_DBGAPB as always on Jon Hunter <jonathanh@nvidia.com> - 2017-03-08 12:30 +0100
            Re: [PATCH] clk: tegra: mark TEGRA210_CLK_DBGAPB as always on Geert Uytterhoeven <geert@linux-m68k.org> - 2017-03-08 12:50 +0100
              Re: [PATCH] clk: tegra: mark TEGRA210_CLK_DBGAPB as always on Jon Hunter <jonathanh@nvidia.com> - 2017-03-08 13:20 +0100
                Re: [PATCH] clk: tegra: mark TEGRA210_CLK_DBGAPB as always on Peter De Schrijver <pdeschrijver@nvidia.com> - 2017-03-13 11:50 +0100
                Re: [PATCH] clk: tegra: mark TEGRA210_CLK_DBGAPB as always on Jon Hunter <jonathanh@nvidia.com> - 2017-03-13 12:10 +0100
                Re: [PATCH] clk: tegra: mark TEGRA210_CLK_DBGAPB as always on Peter De Schrijver <pdeschrijver@nvidia.com> - 2017-03-13 15:20 +0100
          Re: [PATCH] clk: tegra: mark TEGRA210_CLK_DBGAPB as always on Peter De Schrijver <pdeschrijver@nvidia.com> - 2017-03-13 11:50 +0100

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