wil6210: fix for HW bug in interrupt setup logic

Hardware bug triggered by the MSI init while INTx asserted for some reason.
De-assert INTx prior to MSI set-up

Signed-off-by: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

3 files changed, 19 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/wil6210/interrupt.c b/drivers/net/wireless/ath/wil6210/interrupt.c
index 10919f95a83c..52c40e1d593a 100644
--- a/drivers/net/wireless/ath/wil6210/interrupt.c
+++ b/drivers/net/wireless/ath/wil6210/interrupt.c
@@ -493,6 +493,23 @@ free0:
 
         return rc;
 }
+/* can't use wil_ioread32_and_clear because ICC value is not ser yet */
+static inline void wil_clear32(void __iomem *addr)
+{
+        u32 x = ioread32(addr);
+
+        iowrite32(x, addr);
+}
+
+void wil6210_clear_irq(struct wil6210_priv *wil)
+{
+        wil_clear32(wil->csr + HOSTADDR(RGF_DMA_EP_RX_ICR) +
+                    offsetof(struct RGF_ICR, ICR));
+        wil_clear32(wil->csr + HOSTADDR(RGF_DMA_EP_TX_ICR) +
+                    offsetof(struct RGF_ICR, ICR));
+        wil_clear32(wil->csr + HOSTADDR(RGF_DMA_EP_MISC_ICR) +
+                    offsetof(struct RGF_ICR, ICR));
+}
 
 int wil6210_init_irq(struct wil6210_priv *wil, int irq)
 {
diff --git a/drivers/net/wireless/ath/wil6210/pcie_bus.c b/drivers/net/wireless/ath/wil6210/pcie_bus.c
index d96e81131132..c60976144db3 100644
--- a/drivers/net/wireless/ath/wil6210/pcie_bus.c
+++ b/drivers/net/wireless/ath/wil6210/pcie_bus.c
@@ -153,6 +153,7 @@ static int wil_pcie_probe(struct pci_dev *pdev, const struct pci_device_id *id)
         pci_set_drvdata(pdev, wil);
         wil->pdev = pdev;
 
+        wil6210_clear_irq(wil);
         /* FW should raise IRQ when ready */
         rc = wil_if_pcie_enable(wil);
         if (rc) {
diff --git a/drivers/net/wireless/ath/wil6210/wil6210.h b/drivers/net/wireless/ath/wil6210/wil6210.h
index 14f861cd295d..317621c49bf8 100644
--- a/drivers/net/wireless/ath/wil6210/wil6210.h
+++ b/drivers/net/wireless/ath/wil6210/wil6210.h
@@ -476,6 +476,7 @@ int wmi_rxon(struct wil6210_priv *wil, bool on);
 int wmi_get_temperature(struct wil6210_priv *wil, u32 *t_m, u32 *t_r);
 int wmi_disconnect_sta(struct wil6210_priv *wil, const u8 *mac, u16 reason);
 
+void wil6210_clear_irq(struct wil6210_priv *wil);
 int wil6210_init_irq(struct wil6210_priv *wil, int irq);
 void wil6210_fini_irq(struct wil6210_priv *wil, int irq);
 void wil6210_disable_irq(struct wil6210_priv *wil);