linux-kernel - [PATCH] clk: samsung: gs101: fix synchronous external abort in samsung_clk

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Message-Id: <20250303-clk-suspend-fix-v1-1-c2edaf66260f@linaro.org>
Date: Mon, 03 Mar 2025 13:11:21 +0000
From: Peter Griffin <peter.griffin@...aro.org>
To: André Draszik <andre.draszik@...aro.org>, 
 Tudor Ambarus <tudor.ambarus@...aro.org>, 
 Krzysztof Kozlowski <krzk@...nel.org>, 
 Sylwester Nawrocki <s.nawrocki@...sung.com>, 
 Chanwoo Choi <cw00.choi@...sung.com>, Alim Akhtar <alim.akhtar@...sung.com>, 
 Michael Turquette <mturquette@...libre.com>, 
 Stephen Boyd <sboyd@...nel.org>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>, 
 linux-arm-kernel@...ts.infradead.org, linux-samsung-soc@...r.kernel.org, 
 linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org, 
 stable@...r.kernel.org, willmcvicker@...gle.com, kernel-team@...roid.com, 
 Peter Griffin <peter.griffin@...aro.org>
Subject: [PATCH] clk: samsung: gs101: fix synchronous external abort in
 samsung_clk_save()

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 cmu_apm support")
Signed-off-by: Peter Griffin <peter.griffin@...aro.org>
Cc: stable@...r.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-hotplug-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-gs101.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[] __initconst = {
 	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,
-- 
Peter Griffin <peter.griffin@...aro.org>