media: cx88: Fix PAL-Nc standard

* Fix PAL-Nc horizontal parameters according to DScaler:
https://github.com/JohnAdders/DScaler/blob/f7d92b76678e/DScaler/TVFormats.cpp#L88-L94
* Add PAL-Nc TV audio support.
* Tested with CVBS and RF on a Pinnacle PCTV HD 800i.
Signed-off-by: Jorge Maidana <jorgem.linux@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/pci/cx88/cx88-core.c

@@ -618,12 +618,24 @@ EXPORT_SYMBOL(cx88_reset);
 
 static inline unsigned int norm_swidth(v4l2_std_id norm)
 {
-	return (norm & (V4L2_STD_MN & ~V4L2_STD_PAL_Nc)) ? 754 : 922;
+	if (norm & (V4L2_STD_NTSC | V4L2_STD_PAL_M))
+		return 754;
+
+	if (norm & V4L2_STD_PAL_Nc)
+		return 745;
+
+	return 922;
 }
 
 static inline unsigned int norm_hdelay(v4l2_std_id norm)
 {
-	return (norm & (V4L2_STD_MN & ~V4L2_STD_PAL_Nc)) ? 135 : 186;
+	if (norm & (V4L2_STD_NTSC | V4L2_STD_PAL_M))
+		return 135;
+
+	if (norm & V4L2_STD_PAL_Nc)
+		return 149;
+
+	return 186;
 }
 
 static inline unsigned int norm_vdelay(v4l2_std_id norm)
@@ -636,7 +648,7 @@ static inline unsigned int norm_fsc8(v4l2_std_id norm)
 	if (norm & V4L2_STD_PAL_M)
 		return 28604892;      // 3.575611 MHz
 
-	if (norm & (V4L2_STD_PAL_Nc))
+	if (norm & V4L2_STD_PAL_Nc)
 		return 28656448;      // 3.582056 MHz
 
 	if (norm & V4L2_STD_NTSC) // All NTSC/M and variants
@@ -841,8 +853,8 @@ static int set_tvaudio(struct cx88_core *core)
 	} else if (V4L2_STD_SECAM_DK & norm) {
 		core->tvaudio = WW_DK;
 
-	} else if ((V4L2_STD_NTSC_M & norm) ||
-		   (V4L2_STD_PAL_M  & norm)) {
+	} else if ((V4L2_STD_NTSC_M | V4L2_STD_PAL_M | V4L2_STD_PAL_Nc) &
+		   norm) {
 		core->tvaudio = WW_BTSC;
 
 	} else if (V4L2_STD_NTSC_M_JP & norm) {