linux-kernel - [PATCH 2/3] media: rcar-vin: Check for correct capture interrupt event

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Message-ID: <20250614141545.2860860-3-niklas.soderlund+renesas@ragnatech.se>
Date: Sat, 14 Jun 2025 16:15:44 +0200
From: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>
To: Mauro Carvalho Chehab <mchehab@...nel.org>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Sakari Ailus <sakari.ailus@...ux.intel.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	linux-media@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>
Subject: [PATCH 2/3] media: rcar-vin: Check for correct capture interrupt event

Depending on if the capture session deals with fields or whole frames
interrupts can be generated at an end of field, or end of frame event.
The interrupt mask is setup to generate an interrupt on one of the two
events depending on what is needed when the VIN is started. The end of
field bit is set in both cases so controlling the mask that generates an
interrupt have been enough to control the two use-cases.

Before extending the interrupt handler to deal with other types of
interrupt events it is needs to extended to "capture complete" check for
correct the use-case in operation. Without this the simplification in
the handler can result in corrupted frames when the mask on what type of
events can generate an interrupt generated can no longer be assumed to
only be an "capture complete" event.

Which bit is checked matches which bit is enabled at configuration time
as which event can generate an interrupt for "capture complete". There
is no functional change.

While at it switch to use the BIT() macro to describe the bit positions
for the interrupt functions.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>
---
 drivers/media/platform/renesas/rcar-vin/rcar-dma.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/media/platform/renesas/rcar-vin/rcar-dma.c b/drivers/media/platform/renesas/rcar-vin/rcar-dma.c
index 585b8b3dcfd8..85e44a00e0fc 100644
--- a/drivers/media/platform/renesas/rcar-vin/rcar-dma.c
+++ b/drivers/media/platform/renesas/rcar-vin/rcar-dma.c
@@ -115,11 +115,12 @@
 #define VNFC_S_FRAME		(1 << 0)

 /* Video n Interrupt Enable Register bits */
-#define VNIE_FIE		(1 << 4)
-#define VNIE_EFE		(1 << 1)
+#define VNIE_FIE		BIT(4)
+#define VNIE_EFE		BIT(1)

 /* Video n Interrupt Status Register bits */
-#define VNINTS_FIS		(1 << 4)
+#define VNINTS_FIS		BIT(4)
+#define VNINTS_EFS		BIT(1)

 /* Video n Data Mode Register bits */
 #define VNDMR_A8BIT(n)		(((n) & 0xff) << 24)
@@ -1034,7 +1035,7 @@ static void rvin_capture_stop(struct rvin_dev *vin)
 static irqreturn_t rvin_irq(int irq, void *data)
 {
 	struct rvin_dev *vin = data;
-	u32 status, vnms;
+	u32 capture, status, vnms;
 	int slot;
 	unsigned int handled = 0;
 	unsigned long flags;
@@ -1049,7 +1050,10 @@ static irqreturn_t rvin_irq(int irq, void *data)
 	handled = 1;

 	/* Nothing to do if nothing was captured. */
-	if (!(status & VNINTS_FIS))
+	capture = vin->format.field == V4L2_FIELD_NONE ||
+		vin->format.field == V4L2_FIELD_ALTERNATE ?
+		VNINTS_FIS : VNINTS_EFS;
+	if (!(status & capture))
 		goto done;

 	/* Nothing to do if not running. */
-- 
2.49.0