linux-kernel - [PATCH] media: i2c: adv7180: fix adv7280 BT.656-4 compatibility

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Message-Id: <20190827215539.1286-1-mmichilot@gateworks.com>
Date:   Tue, 27 Aug 2019 21:55:39 +0000
From:   Matthew Michilot <matthew.michilot@...il.com>
To:     lars@...afoo.de
Cc:     mchehab@...nel.org, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Matthew Michilot <matthew.michilot@...il.com>
Subject: [PATCH] media: i2c: adv7180: fix adv7280 BT.656-4 compatibility

From: Matthew Michilot <matthew.michilot@...il.com>

Captured video would be out of sync when using the adv7280 with
the BT.656-4 protocol. Certain registers (0x04, 0x31, 0xE6) had to
be configured properly to ensure BT.656-4 compatibility.

An error in the adv7280 reference manual suggested that EAV/SAV mode
was enabled by default, however upon inspecting register 0x31, it was
determined to be disabled by default.

Signed-off-by: Matthew Michilot <matthew.michilot@...il.com>
Reviewed-by: Tim Harvey <tharvey@...eworks.com>
---
 drivers/media/i2c/adv7180.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/media/i2c/adv7180.c b/drivers/media/i2c/adv7180.c
index 99697baad2ea..27da424dce76 100644
--- a/drivers/media/i2c/adv7180.c
+++ b/drivers/media/i2c/adv7180.c
@@ -94,6 +94,7 @@
 #define ADV7180_REG_SHAP_FILTER_CTL_1	0x0017
 #define ADV7180_REG_CTRL_2		0x001d
 #define ADV7180_REG_VSYNC_FIELD_CTL_1	0x0031
+#define ADV7180_VSYNC_FIELD_CTL_1_NEWAV 0x12
 #define ADV7180_REG_MANUAL_WIN_CTL_1	0x003d
 #define ADV7180_REG_MANUAL_WIN_CTL_2	0x003e
 #define ADV7180_REG_MANUAL_WIN_CTL_3	0x003f
@@ -935,10 +936,20 @@ static int adv7182_init(struct adv7180_state *state)
 		adv7180_write(state, ADV7180_REG_EXTENDED_OUTPUT_CONTROL, 0x57);
 		adv7180_write(state, ADV7180_REG_CTRL_2, 0xc0);
 	} else {
-		if (state->chip_info->flags & ADV7180_FLAG_V2)
+		if (state->chip_info->flags & ADV7180_FLAG_V2) {
+			/* ITU-R BT.656-4 compatible */
 			adv7180_write(state,
 				      ADV7180_REG_EXTENDED_OUTPUT_CONTROL,
-				      0x17);
+				      ADV7180_EXTENDED_OUTPUT_CONTROL_NTSCDIS);
+			/* Manually set NEWAVMODE */
+			adv7180_write(state,
+				      ADV7180_REG_VSYNC_FIELD_CTL_1,
+				      ADV7180_VSYNC_FIELD_CTL_1_NEWAV);
+			/* Manually set V bit end position in NTSC mode */
+			adv7180_write(state,
+				      ADV7180_REG_NTSC_V_BIT_END,
+				      ADV7180_NTSC_V_BIT_END_MANUAL_NVEND);
+		}
 		else
 			adv7180_write(state,
 				      ADV7180_REG_EXTENDED_OUTPUT_CONTROL,
-- 
2.17.1