V4L/DVB (6270): V4L: Honor dev->ctl_invert when setting up the decoder in saa7134

When user sets dev->ctl_invert, driver writes negative values to
SAA7134_DEC_LUMA_CONTRAST and SAA7134_DEC_CHROMA_SATURATION,
but general code that initializes decorder ignores that

Signed-off-by: Maxim Levitsky <maximlevitsky@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/saa7134/saa7134-video.c

@@ -584,9 +584,13 @@ static void set_tvnorm(struct saa7134_dev *dev, struct saa7134_tvnorm *norm)
 	saa_writeb(SAA7134_SYNC_CTRL,             sync_control);
 	saa_writeb(SAA7134_LUMA_CTRL,             luma_control);
 	saa_writeb(SAA7134_DEC_LUMA_BRIGHT,       dev->ctl_bright);
-	saa_writeb(SAA7134_DEC_LUMA_CONTRAST,     dev->ctl_contrast);
 
-	saa_writeb(SAA7134_DEC_CHROMA_SATURATION, dev->ctl_saturation);
+	saa_writeb(SAA7134_DEC_LUMA_CONTRAST,
+		dev->ctl_invert ? -dev->ctl_contrast : dev->ctl_contrast);
+
+	saa_writeb(SAA7134_DEC_CHROMA_SATURATION,
+		dev->ctl_invert ? -dev->ctl_saturation : dev->ctl_saturation);
+
 	saa_writeb(SAA7134_DEC_CHROMA_HUE,        dev->ctl_hue);
 	saa_writeb(SAA7134_CHROMA_CTRL1,          norm->chroma_ctrl1);
 	saa_writeb(SAA7134_CHROMA_GAIN,           norm->chroma_gain);