diff mbox series

[01/12] slimbus: qcom-ngd-ctrl: check for device runtime PM status during ISR

Message ID 20221118065246.6835-2-srinivas.kandagatla@linaro.org
State New
Headers
Series slimbus: patches (set 1) for 6.2 |

Commit Message

Srinivas Kandagatla Nov. 18, 2022, 6:52 a.m. UTC 
  From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

Slimbus core interrupt is getting fired after suspend. At this point
ADSP slimbus hardware is off with gated clocks which is leading to an
unclocked access when HLOS slimbus tried to read the interrupt
status register in the ISR.

Co-developed-by: Chandana Kishori Chiluveru <cchiluve@codeaurora.org>
Signed-off-by: Chandana Kishori Chiluveru <cchiluve@codeaurora.org>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
---
 drivers/slimbus/qcom-ngd-ctrl.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/slimbus/qcom-ngd-ctrl.c b/drivers/slimbus/qcom-ngd-ctrl.c
index 76c5e446d243..964adf77b51b 100644
--- a/drivers/slimbus/qcom-ngd-ctrl.c
+++ b/drivers/slimbus/qcom-ngd-ctrl.c
@@ -763,7 +763,14 @@  static irqreturn_t qcom_slim_ngd_interrupt(int irq, void *d)
 {
 	struct qcom_slim_ngd_ctrl *ctrl = d;
 	void __iomem *base = ctrl->ngd->base;
-	u32 stat = readl(base + NGD_INT_STAT);
+	u32 stat;
+
+	if (pm_runtime_suspended(ctrl->ctrl.dev)) {
+		dev_warn_once(ctrl->dev, "Interrupt received while suspended\n");
+		return IRQ_NONE;
+	}
+
+	stat = readl(base + NGD_INT_STAT);
 
 	if ((stat & NGD_INT_MSG_BUF_CONTE) ||
 		(stat & NGD_INT_MSG_TX_INVAL) || (stat & NGD_INT_DEV_ERR) ||