[PATCH] wcn36xx: Check DXE IRQ reason

[Ramon Fried]

IRQ reason was not cheked for errors.
Although error handing is not currently supported, it
will be nice to output an error value to the log if the
DMA operation failed.

Signed-off-by: Ramon Fried <rfried at codeaurora.org>
---
 drivers/net/wireless/ath/wcn36xx/dxe.c | 50 +++++++++++++++++++++++++++++-----
 drivers/net/wireless/ath/wcn36xx/dxe.h |  4 +++
 2 files changed, 47 insertions(+), 7 deletions(-)

diff --git a/drivers/net/wireless/ath/wcn36xx/dxe.c b/drivers/net/wireless/ath/wcn36xx/dxe.c
index 8e4d6d9ea277..7d5ecaf02288 100644
--- a/drivers/net/wireless/ath/wcn36xx/dxe.c
+++ b/drivers/net/wireless/ath/wcn36xx/dxe.c
@@ -415,14 +415,31 @@ static irqreturn_t wcn36xx_irq_tx_complete(int irq, void *dev)
 					  WCN36XX_DXE_CH_STATUS_REG_ADDR_TX_H,
 					  &int_reason);
 
-		/* TODO: Check int_reason */
-
 		wcn36xx_dxe_write_register(wcn,
 					   WCN36XX_DXE_0_INT_CLR,
 					   WCN36XX_INT_MASK_CHAN_TX_H);
 
-		wcn36xx_dxe_write_register(wcn, WCN36XX_DXE_0_INT_ED_CLR,
-					   WCN36XX_INT_MASK_CHAN_TX_H);
+		if (int_reason & WCN36XX_CH_STAT_INT_ERR_MASK ) {
+			wcn36xx_dxe_write_register(wcn,
+						   WCN36XX_DXE_0_INT_ERR_CLR,
+						   WCN36XX_INT_MASK_CHAN_TX_H);
+
+			wcn36xx_err("DXE IRQ reported error: 0x%x in high TX channel\n",
+					int_src);
+		}
+
+		if (int_reason & WCN36XX_CH_STAT_INT_DONE_MASK) {
+			wcn36xx_dxe_write_register(wcn,
+						   WCN36XX_DXE_0_INT_DONE_CLR,
+						   WCN36XX_INT_MASK_CHAN_TX_H);
+		}
+
+		if (int_reason & WCN36XX_CH_STAT_INT_ED_MASK) {
+			wcn36xx_dxe_write_register(wcn,
+						   WCN36XX_DXE_0_INT_ED_CLR,
+						   WCN36XX_INT_MASK_CHAN_TX_H);
+		}
+
 		wcn36xx_dbg(WCN36XX_DBG_DXE, "dxe tx ready high\n");
 		reap_tx_dxes(wcn, &wcn->dxe_tx_h_ch);
 	}
@@ -431,14 +448,33 @@ static irqreturn_t wcn36xx_irq_tx_complete(int irq, void *dev)
 		wcn36xx_dxe_read_register(wcn,
 					  WCN36XX_DXE_CH_STATUS_REG_ADDR_TX_L,
 					  &int_reason);
-		/* TODO: Check int_reason */
 
 		wcn36xx_dxe_write_register(wcn,
 					   WCN36XX_DXE_0_INT_CLR,
 					   WCN36XX_INT_MASK_CHAN_TX_L);
 
-		wcn36xx_dxe_write_register(wcn, WCN36XX_DXE_0_INT_ED_CLR,
-					   WCN36XX_INT_MASK_CHAN_TX_L);
+
+		if (int_reason & WCN36XX_CH_STAT_INT_ERR_MASK ) {
+			wcn36xx_dxe_write_register(wcn,
+						   WCN36XX_DXE_0_INT_ERR_CLR,
+						   WCN36XX_INT_MASK_CHAN_TX_L);
+
+			wcn36xx_err("DXE IRQ reported error: 0x%x in low TX channel\n",
+					int_src);
+		}
+
+		if (int_reason & WCN36XX_CH_STAT_INT_DONE_MASK) {
+			wcn36xx_dxe_write_register(wcn,
+						   WCN36XX_DXE_0_INT_DONE_CLR,
+						   WCN36XX_INT_MASK_CHAN_TX_L);
+		}
+
+		if (int_reason & WCN36XX_CH_STAT_INT_ED_MASK) {
+			wcn36xx_dxe_write_register(wcn,
+						   WCN36XX_DXE_0_INT_ED_CLR,
+						   WCN36XX_INT_MASK_CHAN_TX_L);
+		}
+
 		wcn36xx_dbg(WCN36XX_DBG_DXE, "dxe tx ready low\n");
 		reap_tx_dxes(wcn, &wcn->dxe_tx_l_ch);
 	}
diff --git a/drivers/net/wireless/ath/wcn36xx/dxe.h b/drivers/net/wireless/ath/wcn36xx/dxe.h
index feb3cb7ee81f..2bc376c5391b 100644
--- a/drivers/net/wireless/ath/wcn36xx/dxe.h
+++ b/drivers/net/wireless/ath/wcn36xx/dxe.h
@@ -262,6 +262,10 @@ H2H_TEST_RX_TX = DMA2
 #define WCN36XX_DXE_0_INT_DONE_CLR		(WCN36XX_DXE_MEM_REG + 0x38)
 #define WCN36XX_DXE_0_INT_ERR_CLR		(WCN36XX_DXE_MEM_REG + 0x3C)
 
+#define WCN36XX_CH_STAT_INT_DONE_MASK   0x00008000
+#define WCN36XX_CH_STAT_INT_ERR_MASK    0x00004000
+#define WCN36XX_CH_STAT_INT_ED_MASK     0x00002000
+
 #define WCN36XX_DXE_0_CH0_STATUS		(WCN36XX_DXE_MEM_REG + 0x404)
 #define WCN36XX_DXE_0_CH1_STATUS		(WCN36XX_DXE_MEM_REG + 0x444)
 #define WCN36XX_DXE_0_CH2_STATUS		(WCN36XX_DXE_MEM_REG + 0x484)
-- 
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