linux-kernel - Re: [PATCH] arm64: dts: rockchip: Fix override mode for rk3399-kevin panel

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Date:   Thu, 10 Oct 2019 23:42:21 +0200
From:   Heiko Stuebner <heiko@...ech.de>
To:     Douglas Anderson <dianders@...omium.org>
Cc:     Sean Paul <seanpaul@...omium.org>, devicetree@...r.kernel.org,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        linux-kernel@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        Robin Murphy <robin.murphy@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] arm64: dts: rockchip: Fix override mode for rk3399-kevin panel

Am Dienstag, 8. Oktober 2019, 21:49:54 CEST schrieb Douglas Anderson:
> When I re-posted Sean's original commit to add the override mode for
> the kevin panel, for some reason I didn't notice that the pixel clock
> wasn't quite right.  Looking at /sys/kernel/debug/clk/clk_summary on
> downstream kernels it can be seen that the VOP clock is supposed to be
> 266,666,667 Hz achieved by dividing the 800 MHz PLL by 3.
> 
> Looking at history, it seems that even Sean's first patch [1] had this
> funny clock rate.  I'm not sure where it came from since the commit
> message specifically mentioned 26666 kHz and the Chrome OS tree [2]
> can be seen to request 266667 kHz.
> 
> In any case, let's fix it up.  This together with my patch [3] to do
> the proper rounding when setting the clock rate makes the VOP clock
> more proper as seen in /sys/kernel/debug/clk/clk_summary.
> 
> [1] https://lore.kernel.org/r/20180206165626.37692-4-seanpaul@chromium.org
> [2] https://chromium.googlesource.com/chromiumos/third_party/kernel/+/chromeos-4.4/drivers/gpu/drm/panel/panel-simple.c#1172
> [3] https://lkml.kernel.org/r/20191003114726.v2.1.Ib233b3e706cf6317858384264d5b0ed35657456e@changeid
> 
> Fixes: 84ebd2da6d04 ("arm64: dts: rockchip: Specify override mode for kevin panel")
> Cc: Sean Paul <seanpaul@...omium.org>
> Signed-off-by: Douglas Anderson <dianders@...omium.org>

applied as fix for 5.4

Thanks
Heiko