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Mon, 03 Mar 2025 05:11:24 -0800 (PST) Received: from gpeter-l.roam.corp.google.com ([209.198.129.23]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-43b73703caesm158307785e9.12.2025.03.03.05.11.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 03 Mar 2025 05:11:24 -0800 (PST) From: Peter Griffin Date: Mon, 03 Mar 2025 13:11:21 +0000 Subject: [PATCH] clk: samsung: gs101: fix synchronous external abort in samsung_clk_save() Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250303-clk-suspend-fix-v1-1-c2edaf66260f@linaro.org> X-B4-Tracking: v=1; b=H4sIAHiqxWcC/x2MSQqAMAwAvyI5G+iCWvyKeJA2alCqNCiC9O8Wj zMw84JQYhLoqxcS3Sx8xAK6rsCvU1wIORQGo0yjrLLo9w3lkpNiwJkfdNo3obXOdGShVGeiov/ jMOb8AUPfVtthAAAA To: =?utf-8?q?Andr=C3=A9_Draszik?= , Tudor Ambarus , Krzysztof Kozlowski , Sylwester Nawrocki , Chanwoo Choi , Alim Akhtar , Michael Turquette , Stephen Boyd Cc: Krzysztof Kozlowski , linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, willmcvicker@google.com, kernel-team@android.com, Peter Griffin X-Mailer: b4 0.14.1 X-Developer-Signature: v=1; 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a=openpgp; fpr=0EFC8E6F5578750D56B549FCCEE8B8D6023472BA EARLY_WAKEUP_SW_TRIG_*_SET and EARLY_WAKEUP_SW_TRIG_*_CLEAR registers are only writeable. Attempting to read these registers during samsung_clk_save() causes a synchronous external abort. Remove these 8 registers from cmu_top_clk_regs[] array so that system suspend gets further. Note: the code path can be exercised using the following command: echo mem > /sys/power/state Fixes: 2c597bb7d66a ("clk: samsung: clk-gs101: Add cmu_top, cmu_misc and cm= u_apm support") Signed-off-by: Peter Griffin Cc: stable@vger.kernel.org --- Note: to hit this clock driver issue you also need the CPU hotplug series otherwise system fails earlier offlining CPUs Link: https://lore.kernel.org/linux-arm-kernel/20241213-contrib-pg-cpu-hotp= lug-suspend2ram-fixes-v1-v1-0-c72978f63713@linaro.org/T/ --- drivers/clk/samsung/clk-gs101.c | 8 -------- 1 file changed, 8 deletions(-) diff --git a/drivers/clk/samsung/clk-gs101.c b/drivers/clk/samsung/clk-gs10= 1.c index 86b39edba122..08b867ae3ed9 100644 --- a/drivers/clk/samsung/clk-gs101.c +++ b/drivers/clk/samsung/clk-gs101.c @@ -382,17 +382,9 @@ static const unsigned long cmu_top_clk_regs[] __initco= nst =3D { EARLY_WAKEUP_DPU_DEST, EARLY_WAKEUP_CSIS_DEST, EARLY_WAKEUP_SW_TRIG_APM, - EARLY_WAKEUP_SW_TRIG_APM_SET, - EARLY_WAKEUP_SW_TRIG_APM_CLEAR, EARLY_WAKEUP_SW_TRIG_CLUSTER0, - EARLY_WAKEUP_SW_TRIG_CLUSTER0_SET, - EARLY_WAKEUP_SW_TRIG_CLUSTER0_CLEAR, EARLY_WAKEUP_SW_TRIG_DPU, - EARLY_WAKEUP_SW_TRIG_DPU_SET, - EARLY_WAKEUP_SW_TRIG_DPU_CLEAR, EARLY_WAKEUP_SW_TRIG_CSIS, - EARLY_WAKEUP_SW_TRIG_CSIS_SET, - EARLY_WAKEUP_SW_TRIG_CSIS_CLEAR, CLK_CON_MUX_MUX_CLKCMU_BO_BUS, CLK_CON_MUX_MUX_CLKCMU_BUS0_BUS, CLK_CON_MUX_MUX_CLKCMU_BUS1_BUS, --- base-commit: 480112512bd6e770fa1902d01173731d02377705 change-id: 20250303-clk-suspend-fix-81c5d63827e3 Best regards, --=20 Peter Griffin