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>

diff --git a/drivers/media/video/tw9910.c b/drivers/media/video/tw9910.c
index e70905c..5b801a6 100644 (file)
--- 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);