V4L/DVB (13669): tw9910: Add sync polarity support

Signed-off-by: Kuninori Morimoto <morimoto.kuninori@renesas.com>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 12 insertions, 2 deletions

diff --git a/drivers/media/video/tw9910.c b/drivers/media/video/tw9910.c
index e70905ceef48..5b801a6e1eea 100644
--- a/drivers/media/video/tw9910.c
+++ b/drivers/media/video/tw9910.c
@@ -512,12 +512,21 @@ static int tw9910_set_bus_param(struct soc_camera_device *icd,
 {
         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
         struct i2c_client *client = sd->priv;
+        u8 val = VSSL_VVALID | HSSL_DVALID;
 
         /*
          * set OUTCTR1
+         *
+         * We use VVALID and DVALID signals to control VSYNC and HSYNC
+         * outputs, in this mode their polarity is inverted.
          */
-        return i2c_smbus_write_byte_data(client, OUTCTR1,
-                                         VSSL_VVALID | HSSL_DVALID);
+        if (flags & SOCAM_HSYNC_ACTIVE_LOW)
+                val |= HSP_HI;
+
+        if (flags & SOCAM_VSYNC_ACTIVE_LOW)
+                val |= VSP_HI;
+
+        return i2c_smbus_write_byte_data(client, OUTCTR1, val);
 }
 
 static unsigned long tw9910_query_bus_param(struct soc_camera_device *icd)
@@ -527,6 +536,7 @@ static unsigned long tw9910_query_bus_param(struct soc_camera_device *icd)
         struct soc_camera_link *icl = to_soc_camera_link(icd);
         unsigned long flags = SOCAM_PCLK_SAMPLE_RISING | SOCAM_MASTER |
                 SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_HIGH |
+                SOCAM_VSYNC_ACTIVE_LOW  | SOCAM_HSYNC_ACTIVE_LOW  |
                 SOCAM_DATA_ACTIVE_HIGH | priv->info->buswidth;
 
         return soc_camera_apply_sensor_flags(icl, flags);