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From: Matthias Kaehlcke <mka@chromium.org>
To: Heiko Stuebner <heiko@sntech.de>,
	Rob Herring <robh+dt@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>
Cc: devicetree@vger.kernel.org,
	Douglas Anderson <dianders@chromium.org>,
	linux-kernel@vger.kernel.org, linux-rockchip@lists.infradead.org,
	Matthias Kaehlcke <mka@chromium.org>,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 1/3] ARM: dts: rockchip: disable GPU 500 MHz OPP for veyron
Date: Mon, 20 May 2019 15:00:49 -0700
Message-ID: <20190520220051.54847-1-mka@chromium.org> (raw)

The NPLL is the only safe way to generate 500 MHz for the GPU. The
downstream Chrome OS 3.14 kernel ('official' kernel for veyron
devices) re-purposes NPLL to HDMI and hence disables the OPP for
the GPU (see https://crrev.com/c/1574579). Disable it here as well
to keep in sync and avoid problems in case someone decides to
re-purpose NPLL.

Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
---
Changes in v2:
- patch added to the series
---
 arch/arm/boot/dts/rk3288-veyron.dtsi | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/arm/boot/dts/rk3288-veyron.dtsi b/arch/arm/boot/dts/rk3288-veyron.dtsi
index 90c8312d01ff..ec10ce4fcf04 100644
--- a/arch/arm/boot/dts/rk3288-veyron.dtsi
+++ b/arch/arm/boot/dts/rk3288-veyron.dtsi
@@ -174,6 +174,14 @@
 	temperature = <100000>;
 };
 
+/*
+ * Remove 500 MHz since the only way to make 500 MHz is via the NPLL
+ * which might be used for HDMI.
+ */
+&gpu_opp_table {
+	/delete-node/ opp-500000000;
+};
+
 &hdmi {
 	ddc-i2c-bus = <&i2c5>;
 	status = "okay";
-- 
2.21.0.1020.gf2820cf01a-goog


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Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-20 22:00 Matthias Kaehlcke [this message]
2019-05-20 22:00 ` [PATCH v2 2/3] ARM: dts: rockchip: Use the GPU to cool CPU thermal zone of veyron mickey Matthias Kaehlcke
2019-05-20 23:26   ` Doug Anderson
2019-05-22  9:14   ` Heiko Stuebner
2019-05-20 22:00 ` [PATCH v2 3/3] ARM: dts: rockchip: Configure the GPU thermal zone for mickey Matthias Kaehlcke
2019-05-20 23:29   ` Doug Anderson
2019-05-20 23:24 ` [PATCH v2 1/3] ARM: dts: rockchip: disable GPU 500 MHz OPP for veyron Doug Anderson
2019-05-22  9:14 ` Heiko Stuebner
2019-05-22 18:13   ` Doug Anderson

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