From: Maya Erez <qca_merez@qca.qualcomm.com>
Date: Wed, 5 Apr 2017 11:58:09 +0000 (+0300)
Subject: wil6210: protect against sporadic interrupt during suspend flow
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=a3839fbcf0351e8192429f1cc1c499799465737f;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

wil6210: protect against sporadic interrupt during suspend flow

During the suspend flow, wil6210 HW can send sporadic interrupts,
while PCIe bus is not operational.
To prevent that, keep the interrupts disabled during the suspend
flow and re-enable them only after PCIe enablement in resume.

Signed-off-by: Maya Erez <qca_merez@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
---

diff --git a/drivers/net/wireless/ath/wil6210/pm.c b/drivers/net/wireless/ath/wil6210/pm.c
index a0acb2d0cb79..7260bef314a4 100644
--- a/drivers/net/wireless/ath/wil6210/pm.c
+++ b/drivers/net/wireless/ath/wil6210/pm.c
@@ -80,12 +80,20 @@ int wil_suspend(struct wil6210_priv *wil, bool is_runtime)
 		}
 	}
 
-	if (wil->platform_ops.suspend)
+	/* Disable PCIe IRQ to prevent sporadic IRQs when PCIe is suspending */
+	wil_dbg_pm(wil, "Disabling PCIe IRQ before suspending\n");
+	wil_disable_irq(wil);
+
+	if (wil->platform_ops.suspend) {
 		rc = wil->platform_ops.suspend(wil->platform_handle);
+		if (rc)
+			wil_enable_irq(wil);
+	}
 
 out:
 	wil_dbg_pm(wil, "suspend: %s => %d\n",
 		   is_runtime ? "runtime" : "system", rc);
+
 	return rc;
 }
 
@@ -104,6 +112,9 @@ int wil_resume(struct wil6210_priv *wil, bool is_runtime)
 		}
 	}
 
+	wil_dbg_pm(wil, "Enabling PCIe IRQ\n");
+	wil_enable_irq(wil);
+
 	/* if netif up, bring hardware up
 	 * During open(), IFF_UP set after actual device method
 	 * invocation. This prevent recursive call to wil_up()