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[v3,01/13] davinci: vpif: add check for genuine interrupts in the isr

Message ID 1340622455-10419-2-git-send-email-manjunath.hadli@ti.com (mailing list archive)
State Awaiting Upstream
Headers show

Commit Message

Manjunath Hadli June 25, 2012, 11:07 a.m. UTC 
As the same interrupt is shared between capture and display devices,
sometimes we get isr calls where the interrupt might not genuinely belong
to capture or display. Hence, add a condition in the isr to check for
interrupt ownership and channel number to make sure we do not
service wrong interrupts.

Signed-off-by: Manjunath Hadli <manjunath.hadli@ti.com>
Signed-off-by: Lad, Prabhakar <prabhakar.lad@ti.com>
---
 drivers/media/video/davinci/vpif.h         |   15 +++++++++++++++
 drivers/media/video/davinci/vpif_capture.c |    3 +++
 drivers/media/video/davinci/vpif_display.c |    3 +++
 3 files changed, 21 insertions(+), 0 deletions(-)
diff mbox

Patch

diff --git a/drivers/media/video/davinci/vpif.h b/drivers/media/video/davinci/vpif.h
index 8bcac65..a4d2141 100644
--- a/drivers/media/video/davinci/vpif.h
+++ b/drivers/media/video/davinci/vpif.h
@@ -569,6 +569,21 @@  static inline void ch3_set_vbi_addr(unsigned long top_strt_luma,
 	regw(btm_strt_luma, VPIF_CH3_BTM_STRT_ADD_VANC);
 }
 
+static inline int vpif_intr_status(int channel)
+{
+	int status = 0;
+	int mask;
+
+	if (channel < 0 || channel > 3)
+		return 0;
+
+	mask = 1 << channel;
+	status = regr(VPIF_STATUS) & mask;
+	regw(status, VPIF_STATUS_CLR);
+
+	return status;
+}
+
 #define VPIF_MAX_NAME	(30)
 
 /* This structure will store size parameters as per the mode selected by user */
diff --git a/drivers/media/video/davinci/vpif_capture.c b/drivers/media/video/davinci/vpif_capture.c
index 9604695..e011412 100644
--- a/drivers/media/video/davinci/vpif_capture.c
+++ b/drivers/media/video/davinci/vpif_capture.c
@@ -341,6 +341,9 @@  static irqreturn_t vpif_channel_isr(int irq, void *dev_id)
 	int fid = -1, i;
 
 	channel_id = *(int *)(dev_id);
+	if (!vpif_intr_status(channel_id))
+		return IRQ_NONE;
+
 	ch = dev->dev[channel_id];
 
 	field = ch->common[VPIF_VIDEO_INDEX].fmt.fmt.pix.field;
diff --git a/drivers/media/video/davinci/vpif_display.c b/drivers/media/video/davinci/vpif_display.c
index e6488ee..a5049a9 100644
--- a/drivers/media/video/davinci/vpif_display.c
+++ b/drivers/media/video/davinci/vpif_display.c
@@ -307,6 +307,9 @@  static irqreturn_t vpif_channel_isr(int irq, void *dev_id)
 	int channel_id = 0;
 
 	channel_id = *(int *)(dev_id);
+	if (!vpif_intr_status(channel_id + 2))
+		return IRQ_NONE;
+
 	ch = dev->dev[channel_id];
 	field = ch->common[VPIF_VIDEO_INDEX].fmt.fmt.pix.field;
 	for (i = 0; i < VPIF_NUMOBJECTS; i++) {