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Mon, 20 May 2019 15:00:58 -0700 (PDT) From: Matthias Kaehlcke To: Heiko Stuebner , Rob Herring , Mark Rutland 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> X-Mailer: git-send-email 2.21.0.1020.gf2820cf01a-goog MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190520_150059_429061_E6BD9A15 X-CRM114-Status: GOOD ( 11.13 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, Douglas Anderson , linux-kernel@vger.kernel.org, linux-rockchip@lists.infradead.org, Matthias Kaehlcke , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 --- 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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel