From: Douglas Anderson <dianders@chromium.org> To: Heiko Stuebner <heiko@sntech.de> Cc: Douglas Anderson <dianders@chromium.org>, Sean Paul <seanpaul@chromium.org>, devicetree@vger.kernel.org, Enric Balletbo i Serra <enric.balletbo@collabora.com>, linux-kernel@vger.kernel.org, linux-rockchip@lists.infradead.org, Robin Murphy <robin.murphy@arm.com>, Rob Herring <robh+dt@kernel.org>, Mark Rutland <mark.rutland@arm.com>, Viresh Kumar <viresh.kumar@linaro.org>, linux-arm-kernel@lists.infradead.org Subject: [PATCH] arm64: dts: rockchip: Fix override mode for rk3399-kevin panel Date: Tue, 8 Oct 2019 12:49:54 -0700 [thread overview] Message-ID: <20191008124949.1.I674acd441997dd0690c86c9003743aacda1cf5dd@changeid> (raw) 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@chromium.org> Signed-off-by: Douglas Anderson <dianders@chromium.org> --- arch/arm64/boot/dts/rockchip/rk3399-gru-kevin.dts | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm64/boot/dts/rockchip/rk3399-gru-kevin.dts b/arch/arm64/boot/dts/rockchip/rk3399-gru-kevin.dts index e152b0ca0290..b8066868a3fe 100644 --- a/arch/arm64/boot/dts/rockchip/rk3399-gru-kevin.dts +++ b/arch/arm64/boot/dts/rockchip/rk3399-gru-kevin.dts @@ -44,7 +44,7 @@ power-supply = <&pp3300_disp>; panel-timing { - clock-frequency = <266604720>; + clock-frequency = <266666667>; hactive = <2400>; hfront-porch = <48>; hback-porch = <84>; -- 2.23.0.581.g78d2f28ef7-goog
WARNING: multiple messages have this Message-ID (diff)
From: Douglas Anderson <dianders@chromium.org> To: Heiko Stuebner <heiko@sntech.de> Cc: Mark Rutland <mark.rutland@arm.com>, devicetree@vger.kernel.org, Viresh Kumar <viresh.kumar@linaro.org>, Douglas Anderson <dianders@chromium.org>, linux-kernel@vger.kernel.org, linux-rockchip@lists.infradead.org, Rob Herring <robh+dt@kernel.org>, Sean Paul <seanpaul@chromium.org>, Enric Balletbo i Serra <enric.balletbo@collabora.com>, Robin Murphy <robin.murphy@arm.com>, linux-arm-kernel@lists.infradead.org Subject: [PATCH] arm64: dts: rockchip: Fix override mode for rk3399-kevin panel Date: Tue, 8 Oct 2019 12:49:54 -0700 [thread overview] Message-ID: <20191008124949.1.I674acd441997dd0690c86c9003743aacda1cf5dd@changeid> (raw) 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@chromium.org> Signed-off-by: Douglas Anderson <dianders@chromium.org> --- arch/arm64/boot/dts/rockchip/rk3399-gru-kevin.dts | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm64/boot/dts/rockchip/rk3399-gru-kevin.dts b/arch/arm64/boot/dts/rockchip/rk3399-gru-kevin.dts index e152b0ca0290..b8066868a3fe 100644 --- a/arch/arm64/boot/dts/rockchip/rk3399-gru-kevin.dts +++ b/arch/arm64/boot/dts/rockchip/rk3399-gru-kevin.dts @@ -44,7 +44,7 @@ power-supply = <&pp3300_disp>; panel-timing { - clock-frequency = <266604720>; + clock-frequency = <266666667>; hactive = <2400>; hfront-porch = <48>; hback-porch = <84>; -- 2.23.0.581.g78d2f28ef7-goog _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next reply other threads:[~2019-10-08 19:50 UTC|newest] Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-10-08 19:49 Douglas Anderson [this message] 2019-10-08 19:49 ` [PATCH] arm64: dts: rockchip: Fix override mode for rk3399-kevin panel Douglas Anderson 2019-10-10 21:42 ` Heiko Stuebner 2019-10-10 21:42 ` Heiko Stuebner
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