[d-kernel] [PATCH 25/39] sound: dwc-i2s: paper over RX overrun warnings on Baikal-M

[Daniil Gnusarev]

From: Alexey Sheplyakov <asheplyakov на basealt.ru>

i2s_irq_handler: avoid flooding system with RX overrun warnings

Signed-off-by: Alexey Sheplyakov <asheplyakov на basealt.ru>
X-feature-Baikal-M
X-DONTUPSTREAM
---
 sound/soc/dwc/dwc-i2s.c | 9 +++++++--
 sound/soc/dwc/local.h   | 1 +
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/sound/soc/dwc/dwc-i2s.c b/sound/soc/dwc/dwc-i2s.c
index 9ea4be56d3b70..17b5fee698161 100644
--- a/sound/soc/dwc/dwc-i2s.c
+++ b/sound/soc/dwc/dwc-i2s.c
@@ -102,6 +102,7 @@ static inline void i2s_enable_irqs(struct dw_i2s_dev *dev, u32 stream,
 
 static irqreturn_t i2s_irq_handler(int irq, void *dev_id)
 {
+	unsigned int rxor_count;
 	struct dw_i2s_dev *dev = dev_id;
 	bool irq_valid = false;
 	u32 isr[4];
@@ -138,9 +139,13 @@ static irqreturn_t i2s_irq_handler(int irq, void *dev_id)
 			irq_valid = true;
 		}
 
-		/* Error Handling: TX */
+		/* Error Handling: RX */
 		if (isr[i] & ISR_RXFO) {
-			dev_err_ratelimited(dev->dev, "RX overrun (ch_id=%d)\n", i);
+			rxor_count = READ_ONCE(dev->rx_overrun_count);
+			if (!(rxor_count & 0x3ff))
+				dev_err_ratelimited(dev->dev, "RX overrun (ch_id=%d)\n", i);
+			rxor_count++;
+			WRITE_ONCE(dev->rx_overrun_count, rxor_count);
 			irq_valid = true;
 		}
 	}
diff --git a/sound/soc/dwc/local.h b/sound/soc/dwc/local.h
index dce88c9ad5f33..be7a026e5f918 100644
--- a/sound/soc/dwc/local.h
+++ b/sound/soc/dwc/local.h
@@ -149,6 +149,7 @@ struct dw_i2s_dev {
 			bool *period_elapsed);
 	unsigned int tx_ptr;
 	unsigned int rx_ptr;
+	unsigned int rx_overrun_count;
 };
 
 #if IS_ENABLED(CONFIG_SND_DESIGNWARE_PCM)
-- 
2.42.2