linux-kernel - [PATCH] media: sun6i-csi: Fix incorrect HSYNC/VSYNC/PCLK polarity configuration

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Message-Id: <20191128020259.1338188-1-megous@megous.com>
Date:   Thu, 28 Nov 2019 03:02:59 +0100
From:   Ondrej Jirman <megous@...ous.com>
To:     linux-sunxi@...glegroups.com
Cc:     Ondrej Jirman <megous@...ous.com>,
        Yong Deng <yong.deng@...ewell.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        linux-media@...r.kernel.org (open list:CSI DRIVERS FOR ALLWINNER V3s),
        linux-arm-kernel@...ts.infradead.org (moderated list:ARM/Allwinner
        sunXi SoC support), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] media: sun6i-csi: Fix incorrect HSYNC/VSYNC/PCLK polarity configuration

This was discovered by writing a new camera driver and wondering, why
hsync/vsync polarity setting behaves in reverse to what would be
expected. Verified by looking at the actual signals and the SoC
user manual.

Fixes: 5cc7522d8965 ("media: sun6i: Add support for Allwinner CSI V3s")
Signed-off-by: Ondrej Jirman <megous@...ous.com>
---
 drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
index f17e5550602d..98bbcca59a90 100644
--- a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
+++ b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
@@ -417,12 +417,12 @@ static void sun6i_csi_setup_bus(struct sun6i_csi_dev *sdev)
 		if (flags & V4L2_MBUS_FIELD_EVEN_LOW)
 			cfg |= CSI_IF_CFG_FIELD_POSITIVE;
 
-		if (flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)
+		if (flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH)
 			cfg |= CSI_IF_CFG_VREF_POL_POSITIVE;
-		if (flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)
+		if (flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH)
 			cfg |= CSI_IF_CFG_HREF_POL_POSITIVE;
 
-		if (flags & V4L2_MBUS_PCLK_SAMPLE_RISING)
+		if (flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)
 			cfg |= CSI_IF_CFG_CLK_POL_FALLING_EDGE;
 		break;
 	case V4L2_MBUS_BT656:
-- 
2.24.0