SM8550: mask the IPCC mailbox irq on suspend (parity with SM8750)

projects/ROCKNIX/devices/SM8550/patches/linux/0502-wakeup-qcom-ipcc-remove-IRQF-NO-SUSPEND.patch

@@ -0,0 +1,32 @@
+From: Ashketchup <ashley@shuuri.net>
+Subject: [PATCH] wakeup: qcom-ipcc: remove IRQF_NO_SUSPEND across system suspend
+
+The SM8550 deep-sleep self-wake (every few minutes) is the ADSP charger firmware
+pushing BATTMGR_NOTIFICATION over pmic_glink. Those notifications ring the IPCC
+mailbox IRQ, which is requested with IRQF_NO_SUSPEND and so is never masked across
+system suspend, pulling the SoC back out of deep sleep.
+
+Drop IRQF_NO_SUSPEND so the IPCC IRQ is masked during suspend like a normal IRQ.
+Co-processor doorbells (charger, sensors, modem) no longer wake the AP while it is
+asleep; pending signals are handled on resume instead. This mirrors the patch
+ROCKNIX already carries for SM8750, which uses the same battmgr/pmic_glink charger
+model and sleeps reliably with it.
+
+Verified on the Retroid Pocket 6: 30+ minute uninterrupted deep sleeps where
+the device previously could not stay asleep past 5 to 10 minutes.
+
+Signed-off-by: Ashketchup <ashley@shuuri.net>
+---
+diff --git a/drivers/mailbox/qcom-ipcc.c b/drivers/mailbox/qcom-ipcc.c
+index d957d989c..2e4bb5efb 100644
+--- a/drivers/mailbox/qcom-ipcc.c
++++ b/drivers/mailbox/qcom-ipcc.c
+@@ -321,7 +321,7 @@ static int qcom_ipcc_probe(struct platform_device *pdev)
+ 		goto err_mbox;
+
+ 	ret = devm_request_irq(&pdev->dev, ipcc->irq, qcom_ipcc_irq_fn,
+-			       IRQF_TRIGGER_HIGH | IRQF_NO_SUSPEND |
++			       IRQF_TRIGGER_HIGH |
+ 			       IRQF_NO_THREAD, name, ipcc);
+ 	if (ret < 0) {
+ 		dev_err(&pdev->dev, "Failed to register the irq: %d\n", ret);