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[v3,9/9,media] tvp5150: disable output while signal not locked

Message ID 1457969017-4088-9-git-send-email-l.stach@pengutronix.de (mailing list archive)
State New, archived
Headers show

Commit Message

Lucas Stach March 14, 2016, 3:23 p.m. UTC 
From: Philipp Zabel <p.zabel@pengutronix.de>

To avoid short frames on stream start, keep output pins at high impedance
while we are not properly locked onto the input signal.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
---
 drivers/media/i2c/tvp5150.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)
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Patch

diff --git a/drivers/media/i2c/tvp5150.c b/drivers/media/i2c/tvp5150.c
index b5140253b648..13ce826a4093 100644
--- a/drivers/media/i2c/tvp5150.c
+++ b/drivers/media/i2c/tvp5150.c
@@ -51,6 +51,7 @@  struct tvp5150 {
 	v4l2_std_id detected_norm;
 	u32 input;
 	u32 output;
+	u32 oe;
 	int enable;
 	bool lock;
 };
@@ -809,8 +810,11 @@  static irqreturn_t tvp5150_isr(int irq, void *dev_id)
 	if (status) {
 		regmap_write(map, TVP5150_INT_STATUS_REG_A, status);
 
-		if (status & TVP5150_INT_A_LOCK)
+		if (status & TVP5150_INT_A_LOCK) {
 			decoder->lock = !!(status & TVP5150_INT_A_LOCK_STATUS);
+			regmap_update_bits(decoder->regmap, TVP5150_MISC_CTL,
+					   0xd, decoder->lock ? decoder->oe : 0);
+		}
 
 		return IRQ_HANDLED;
 	}
@@ -841,6 +845,7 @@  static int tvp5150_enable(struct v4l2_subdev *sd)
 				   0x7, 0x7);
 		/* disable HSYNC, VSYNC/PALI, AVID, and FID/GLCO */
 		regmap_update_bits(decoder->regmap, TVP5150_MISC_CTL, 0x4, 0x0);
+		decoder->oe = 0x9;
 		break;
 	case V4L2_MBUS_PARALLEL:
 		/* 8-bit YUV 4:2:2 */
@@ -848,6 +853,7 @@  static int tvp5150_enable(struct v4l2_subdev *sd)
 				   0x7, 0x0);
 		/* enable HSYNC, VSYNC/PALI, AVID, and FID/GLCO */
 		regmap_update_bits(decoder->regmap, TVP5150_MISC_CTL, 0x4, 0x4);
+		decoder->oe = 0xd;
 		break;
 	default:
 		return -EINVAL;
@@ -994,9 +1000,9 @@  static int tvp5150_s_stream(struct v4l2_subdev *sd, int enable)
 	struct tvp5150 *decoder = container_of(sd, struct tvp5150, sd);
 
 	if (enable) {
-		/* Enable YUV(OUT7:0), clock */
+		/* Enable YUV(OUT7:0), (SYNC), clock signal, if locked */
 		regmap_update_bits(decoder->regmap, TVP5150_MISC_CTL, 0xd,
-			(decoder->bus_type == V4L2_MBUS_BT656) ? 0x9 : 0xd);
+				   decoder->lock ? decoder->oe : 0);
 		if (decoder->irq) {
 			/* Enable lock interrupt */
 			regmap_update_bits(decoder->regmap,