diff --git a/kernel/patches/0504-wakeup-qcom-ipcc-remove-IRQF-NO-SUSPEND.patch b/kernel/patches/0504-wakeup-qcom-ipcc-remove-IRQF-NO-SUSPEND.patch
index d9dc952..3eb5c7d 100644
--- a/kernel/patches/0504-wakeup-qcom-ipcc-remove-IRQF-NO-SUSPEND.patch
+++ b/kernel/patches/0504-wakeup-qcom-ipcc-remove-IRQF-NO-SUSPEND.patch
@@ -1,9 +1,14 @@
 From: ROCKNIX <noreply@rocknix.org>
-Subject: [PATCH] mailbox: qcom-ipcc: allow SM8750 IRQ suspension
+Subject: [PATCH] mailbox: qcom-ipcc: allow SM8750 and SM8550 IRQ suspension
 
-SM8750 suspend-to-RAM requires the IPCC summary interrupt to be suspended.
-Keep IRQF_NO_SUSPEND on every other SoC so the SM8750 workaround does not
-change established suspend behavior on the shared driver.
+SM8750 and SM8550 suspend-to-RAM require the IPCC summary interrupt to be
+suspended. On SM8550 the ADSP charger firmware pushes an unsolicited
+BATTMGR_NOTIFICATION about half a second after suspend entry; with
+IRQF_NO_SUSPEND the mailbox irq is never masked, so that notification pulls
+the SoC straight back out.
+
+Keep IRQF_NO_SUSPEND on every other SoC so the workaround does not change
+established suspend behavior on the shared driver.
 
 diff --git a/drivers/mailbox/qcom-ipcc.c b/drivers/mailbox/qcom-ipcc.c
 --- a/drivers/mailbox/qcom-ipcc.c
@@ -24,11 +29,12 @@ diff --git a/drivers/mailbox/qcom-ipcc.c b/drivers/mailbox/qcom-ipcc.c
  	int ret;
  
  	ipcc = devm_kzalloc(&pdev->dev, sizeof(*ipcc), GFP_KERNEL);
-@@ -318,9 +319,11 @@ static int qcom_ipcc_probe(struct platform_device *pdev)
+@@ -318,9 +319,12 @@ static int qcom_ipcc_probe(struct platform_device *pdev)
  	if (ret)
  		goto err_mbox;
  
-+	if (!of_device_is_compatible(pdev->dev.of_node, "qcom,sm8750-ipcc"))
++	if (!of_device_is_compatible(pdev->dev.of_node, "qcom,sm8750-ipcc") &&
++	    !of_device_is_compatible(pdev->dev.of_node, "qcom,sm8550-ipcc"))
 +		irqflags |= IRQF_NO_SUSPEND;
 +
  	ret = devm_request_irq(&pdev->dev, ipcc->irq, qcom_ipcc_irq_fn,