linux-kernel - Re: [PATCH v2 0/4] clk: meson8b: updates for video clocks / resets

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Date:   Wed, 29 Apr 2020 13:44:51 +0200
From:   Jerome Brunet <jbrunet@...libre.com>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        linux-amlogic@...ts.infradead.org, linux-clk@...r.kernel.org
Cc:     narmstrong@...libre.com, mturquette@...libre.com, sboyd@...nel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/4] clk: meson8b: updates for video clocks / resets


On Fri 17 Apr 2020 at 20:41, Martin Blumenstingl <martin.blumenstingl@...glemail.com> wrote:

> This is the first batch of fixes and updates for the Meson8/8b/8m2
> clock controller driver.
>
> The first patch fixes the video clock hierarchy. Special thanks to
> Neil for providing a lot of details about the video clock tree!
>
> The second and third came up while testing video output on my EC-100
> (Endless Mini). This board is special because u-boot does not enable
> the video outputs like most other u-boot versions do. However, this
> is very useful for development because it shows (the hard way ;))
> where the existing code is buggy.
>
> The last patch is a small improvement for the VPU clock so we
> utilize the glitch-free mux (on SoCs which support it) and avoid
> problems by changing the "live" clock tree at runtime (with the mali
> clock this resulted in system hangs/freezes).
>
> In my opinion all of these patches - including the fixes - can go to
> "next" because the relevant clock trees are still read-only.
>
>
> Changes since v1 at [0]:
> - updated the description in patch #1 to clarify that (it seems that)
>   there is no fixed pre-multiplier for the HDMI PLL (like on GXL for
>   example). Spotted by Jerome - thanks!
> - simplified the logic for the active_low resets in patch #2 by
>   shortening the if ... else. Thanks to Jerome for the suggestion.
>
>
> [0] https://patchwork.kernel.org/cover/11489079/
>
>
> Martin Blumenstingl (4):
>   clk: meson: meson8b: Fix the first parent of vid_pll_in_sel
>   clk: meson: meson8b: Fix the polarity of the RESET_N lines
>   clk: meson: meson8b: Fix the vclk_div{1,2,4,6,12}_en gate bits
>   clk: meson: meson8b: Make the CCF use the glitch-free VPU mux

Applied, Thx

>
>  drivers/clk/meson/meson8b.c | 105 +++++++++++++++++++++++++-----------
>  1 file changed, 73 insertions(+), 32 deletions(-)