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Re: [PATCH v2 06/13] drm/sun4i: hdmi: Allow using second PLL as TMDS clk parent

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On Tue, Sep 26, 2017 at 06:59:12AM +0000, Chen-Yu Tsai wrote:
> Allwinner SoCs typically have two PLLs reserved for video related usage.
> At the moment we only support using the first one to feed the HDMI
> transmitter block's TMDS clock.
> 
> Let the HDMI encoder's TMDS clock go through all of its parents when
> calculating possible clock rates. This allows usage of the second video
> PLL as its parent.
> 
> Note that this does not handle conflicting pixel clocks. It is entirely
> possible to have an LCD panel use one pixel clock rate, only to be
> overridden by the HDMI transmitter's clock rate request when the second
> display pipeline is enabled.
> 
> This should be handled by having all the clock drivers honor clock rate
> ranges, and have the consumers use clk_set_rate_min/clk_set_rate_max.

That, or relying on clk_set_rate_protect

Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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[PATCH v2 00/13] drm/sun4i: hdmi: Support HDMI controller on A31 Chen-Yu Tsai <wens@csie.org> - 2017-09-26 09:10 +0200
  [PATCH v2 07/13] dt-bindings: display: sun4i: Add binding for A31 HDMI controller Chen-Yu Tsai <wens@csie.org> - 2017-09-26 09:10 +0200
  [PATCH v2 02/13] clk: sunxi-ng: sun6i: Rename HDMI DDC clock to avoid name collision Chen-Yu Tsai <wens@csie.org> - 2017-09-26 09:10 +0200
    Re: [PATCH v2 02/13] clk: sunxi-ng: sun6i: Rename HDMI DDC clock to  avoid name collision Maxime Ripard <maxime.ripard@free-electrons.com> - 2017-09-26 11:40 +0200
      Re: [PATCH v2 02/13] clk: sunxi-ng: sun6i: Rename HDMI DDC clock to  avoid name collision Chen-Yu Tsai <wens@csie.org> - 2017-09-27 05:50 +0200
  [PATCH v2 09/13] drm/sun4i: hdmi: Add support for controller hardware variants Chen-Yu Tsai <wens@csie.org> - 2017-09-26 09:10 +0200
    Re: [PATCH v2 09/13] drm/sun4i: hdmi: Add support for controller  hardware variants Maxime Ripard <maxime.ripard@free-electrons.com> - 2017-09-26 12:10 +0200
  [PATCH v2 13/13] ARM: dts: sun6i: Enable HDMI support on some A31/A31s devices Chen-Yu Tsai <wens@csie.org> - 2017-09-26 09:10 +0200
  [PATCH v2 08/13] regmap: add iopoll-like polling macro for regmap_field Chen-Yu Tsai <wens@csie.org> - 2017-09-26 09:10 +0200
  [PATCH v2 10/13] drm/sun4i: hdmi: Add A31 specific DDC register definitions Chen-Yu Tsai <wens@csie.org> - 2017-09-26 09:10 +0200
    Re: [PATCH v2 10/13] drm/sun4i: hdmi: Add A31 specific DDC register  definitions Maxime Ripard <maxime.ripard@free-electrons.com> - 2017-09-26 12:10 +0200
  [PATCH v2 04/13] drm/sun4i: hdmi: Disable clks in bind function error path and unbind function Chen-Yu Tsai <wens@csie.org> - 2017-09-26 09:10 +0200
    Re: [PATCH v2 04/13] drm/sun4i: hdmi: Disable clks in bind function  error path and unbind function Maxime Ripard <maxime.ripard@free-electrons.com> - 2017-09-26 12:00 +0200
  [PATCH v2 03/13] drm/sun4i: tcon: Add support for demuxing TCON output on A31 Chen-Yu Tsai <wens@csie.org> - 2017-09-26 09:10 +0200
    Re: [PATCH v2 03/13] drm/sun4i: tcon: Add support for demuxing TCON  output on A31 Maxime Ripard <maxime.ripard@free-electrons.com> - 2017-09-26 12:00 +0200
      Re: [PATCH v2 03/13] drm/sun4i: tcon: Add support for demuxing TCON  output on A31 Chen-Yu Tsai <wens@csie.org> - 2017-09-27 06:10 +0200
  [PATCH v2 05/13] drm/sun4i: hdmi: create a regmap for later use Chen-Yu Tsai <wens@csie.org> - 2017-09-26 09:10 +0200
    Re: [PATCH v2 05/13] drm/sun4i: hdmi: create a regmap for later use Maxime Ripard <maxime.ripard@free-electrons.com> - 2017-09-26 12:00 +0200
  [PATCH v2 06/13] drm/sun4i: hdmi: Allow using second PLL as TMDS clk parent Chen-Yu Tsai <wens@csie.org> - 2017-09-26 09:10 +0200
    Re: [PATCH v2 06/13] drm/sun4i: hdmi: Allow using second PLL as TMDS  clk parent Maxime Ripard <maxime.ripard@free-electrons.com> - 2017-09-26 12:00 +0200

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