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Tue, 21 May 2019 16:50:08 -0700 (PDT) From: Douglas Anderson To: Heiko Stuebner Subject: [PATCH] ARM: dts: rockchip: Mark that the rk3288 timer might stop in suspend Date: Tue, 21 May 2019 16:49:33 -0700 Message-Id: <20190521234933.153953-1-dianders@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-20190521_165011_860632_40D275B4 X-CRM114-Status: GOOD ( 12.59 ) 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: Mark Rutland , devicetree@vger.kernel.org, briannorris@chromium.org, linux-kernel@vger.kernel.org, Rob Herring , Douglas Anderson , linux-rockchip@lists.infradead.org, mka@chromium.org, ryandcase@chromium.org, 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 This is similar to commit e6186820a745 ("arm64: dts: rockchip: Arch counter doesn't tick in system suspend"). Specifically on the rk3288 it can be seen that the timer stops ticking in suspend if we end up running through the "osc_disable" path in rk3288_slp_mode_set(). In that path the 24 MHz clock will turn off and the timer stops. To test this, I ran this on a Chrome OS filesystem: before=$(date); \ suspend_stress_test -c1 --suspend_min=30 --suspend_max=31; \ echo ${before}; date ...and I found that unless I plug in a device that requests USB wakeup to be active that the two calls to "date" would show that fewer than 30 seconds passed. NOTE: deep suspend (where the 24 MHz clock gets disabled) isn't supported yet on upstream Linux so this was tested on a downstream kernel. Signed-off-by: Douglas Anderson --- arch/arm/boot/dts/rk3288.dtsi | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm/boot/dts/rk3288.dtsi b/arch/arm/boot/dts/rk3288.dtsi index 171231a0cd9b..1e5260b556b7 100644 --- a/arch/arm/boot/dts/rk3288.dtsi +++ b/arch/arm/boot/dts/rk3288.dtsi @@ -231,6 +231,7 @@ , ; clock-frequency = <24000000>; + arm,no-tick-in-suspend; }; timer: timer@ff810000 { -- 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