From: Hugues Fruchet <hugues.fruchet@st.com>
Date: Mon, 1 Apr 2019 08:55:00 +0000 (-0400)
Subject: media: stm32-dcmi: do not emit error trace in case of few overrun
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=1be0a2b702308f16fc1c1a58ada5aba13afc123e;p=openwrt%2Fstaging%2Fblogic.git

media: stm32-dcmi: do not emit error trace in case of few overrun

Report overrun error only when it exceeds a given threshold.

Signed-off-by: Hugues Fruchet <hugues.fruchet@st.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
---

diff --git a/drivers/media/platform/stm32/stm32-dcmi.c b/drivers/media/platform/stm32/stm32-dcmi.c
index 693415cf8518..b63d57cd89e5 100644
--- a/drivers/media/platform/stm32/stm32-dcmi.c
+++ b/drivers/media/platform/stm32/stm32-dcmi.c
@@ -97,6 +97,8 @@ enum state {
 
 #define TIMEOUT_MS	1000
 
+#define OVERRUN_ERROR_THRESHOLD	3
+
 struct dcmi_graph_entity {
 	struct device_node *node;
 
@@ -446,11 +448,13 @@ static irqreturn_t dcmi_irq_thread(int irq, void *arg)
 
 	spin_lock_irq(&dcmi->irqlock);
 
-	if ((dcmi->misr & IT_OVR) || (dcmi->misr & IT_ERR)) {
-		dcmi->errors_count++;
-		if (dcmi->misr & IT_OVR)
-			dcmi->overrun_count++;
+	if (dcmi->misr & IT_OVR) {
+		dcmi->overrun_count++;
+		if (dcmi->overrun_count > OVERRUN_ERROR_THRESHOLD)
+			dcmi->errors_count++;
 	}
+	if (dcmi->misr & IT_ERR)
+		dcmi->errors_count++;
 
 	if (dcmi->sd_format->fourcc == V4L2_PIX_FMT_JPEG &&
 	    dcmi->misr & IT_FRAME) {