From 4d9130d59e96c0153d87d8be137bfbdd312b905b Mon Sep 17 00:00:00 2001
From: Evoke Zhang <evoke.zhang@amlogic.com>
Date: Tue, 20 Aug 2019 15:02:30 +0800
Subject: [PATCH] tvafe: update snow playing nosig state [1/1]

PD#SWPL-12778

Problem:
atv signal can't recover after hot plug cable

Solution:
update snow playing nosig state

Verify:
x301

Change-Id: I143ca203c60e5090d41e543306f3929b4544af0c
Signed-off-by: Evoke Zhang <evoke.zhang@amlogic.com>
---
 drivers/amlogic/media/vin/tvin/tvafe/tvafe.c   | 18 ++++++++++++++++--
 .../amlogic/media/vin/tvin/tvafe/tvafe_cvd.h   |  1 +
 .../amlogic/media/vin/tvin/tvafe/tvafe_debug.c |  2 +-
 3 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/drivers/amlogic/media/vin/tvin/tvafe/tvafe.c b/drivers/amlogic/media/vin/tvin/tvafe/tvafe.c
index ca65de035755..b021b348d58f 100644
--- a/drivers/amlogic/media/vin/tvin/tvafe/tvafe.c
+++ b/drivers/amlogic/media/vin/tvin/tvafe/tvafe.c
@@ -700,8 +700,22 @@ bool tvafe_is_nosig(struct tvin_frontend_s *fe)
 
 	ret = tvafe_cvd2_no_sig(&tvafe->cvd2, &devp->mem);
 	if ((!tvafe_mode) && (port == TVIN_PORT_CVBS3) &&
-		(devp->flags & TVAFE_FLAG_DEV_SNOW_FLAG)) /* playing snow */
-		ret = true;
+		(devp->flags & TVAFE_FLAG_DEV_SNOW_FLAG)) { /* playing snow */
+		tvafe->cvd2.info.snow_state[3] = tvafe->cvd2.info.snow_state[2];
+		tvafe->cvd2.info.snow_state[2] = tvafe->cvd2.info.snow_state[1];
+		tvafe->cvd2.info.snow_state[1] = tvafe->cvd2.info.snow_state[0];
+		if (ret)
+			tvafe->cvd2.info.snow_state[0] = 0;
+		else
+			tvafe->cvd2.info.snow_state[0] = 1;
+		if ((tvafe->cvd2.info.snow_state[3] +
+			tvafe->cvd2.info.snow_state[2] +
+			tvafe->cvd2.info.snow_state[1] +
+			tvafe->cvd2.info.snow_state[0]) == 4)
+			ret = false;
+		else
+			ret = true;
+	}
 	if ((port == TVIN_PORT_CVBS3) &&
 		(tvafe->cvd2.config_fmt == TVIN_SIG_FMT_CVBS_PAL_I)) {
 		/*fix black side when config atv snow*/
diff --git a/drivers/amlogic/media/vin/tvin/tvafe/tvafe_cvd.h b/drivers/amlogic/media/vin/tvin/tvafe/tvafe_cvd.h
index ce6b1715f5ff..7ecfea2a6d33 100644
--- a/drivers/amlogic/media/vin/tvin/tvafe/tvafe_cvd.h
+++ b/drivers/amlogic/media/vin/tvin/tvafe/tvafe_cvd.h
@@ -136,6 +136,7 @@ struct tvafe_cvd2_info_s {
 	unsigned short dgain[4];
 	unsigned short dgain_cnt;
 #endif
+	unsigned char snow_state[4]; /* 0:nosig, 1:stable */
 	unsigned int comb_check_cnt;
 	unsigned int fmt_shift_cnt;
 	unsigned short nonstd_cnt;
diff --git a/drivers/amlogic/media/vin/tvin/tvafe/tvafe_debug.c b/drivers/amlogic/media/vin/tvin/tvafe/tvafe_debug.c
index 40466ca42dbf..4648832a172a 100644
--- a/drivers/amlogic/media/vin/tvin/tvafe/tvafe_debug.c
+++ b/drivers/amlogic/media/vin/tvin/tvafe/tvafe_debug.c
@@ -491,7 +491,7 @@ static const char *tvafe_debug_usage_str = {
 "\n"
 "    echo afe_ver > /sys/class/tvafe/tvafe0/debug;show tvafe version\n"
 "\n"
-"    echo snow val(d) > /sys/class/tvafe/tvafe0/debug;snow on/off\n"
+"    echo snowon val(d) > /sys/class/tvafe/tvafe0/debug;snow on/off\n"
 "\n"
 "    echo frame_skip_enable val(d) > /sys/class/tvafe/tvafe0/debug;frame skip enable/disable\n"
 "\n"