V4L/DVB (4980): Fixes bug 7267: PAL/60 is not working

On cx88 driver, sampling rate should be at chroma subcarrier freq (FSC).
However, driver were programming wrong values for PAL/60, PAL/Nc and
NTSC 4.43. This patch do the proper calculation. It also calculates
htotal, hdelay and hactive constants, according with the sampling
rate.
It is tested with PAL/60 by Piotr Maksymuk and Olivier. Also tested with
the already-supported standards.

Test is still required for PAL/Nc.

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

2 files changed, 23 insertions, 14 deletions

diff --git a/drivers/media/video/cx88/cx88-core.c b/drivers/media/video/cx88/cx88-core.c
index 453af5e943ff..18997361c75a 100644
--- a/drivers/media/video/cx88/cx88-core.c
+++ b/drivers/media/video/cx88/cx88-core.c
@@ -633,12 +633,12 @@ int cx88_reset(struct cx88_core *core)
 
 static unsigned int inline norm_swidth(struct cx88_tvnorm *norm)
 {
-        return (norm->id & V4L2_STD_625_50) ? 922 : 754;
+        return (norm->id & (V4L2_STD_MN & ~V4L2_STD_PAL_Nc)) ? 754 : 922;
 }
 
 static unsigned int inline norm_hdelay(struct cx88_tvnorm *norm)
 {
-        return (norm->id & V4L2_STD_625_50) ? 186 : 135;
+        return (norm->id & (V4L2_STD_MN & ~V4L2_STD_PAL_Nc)) ? 135 : 186;
 }
 
 static unsigned int inline norm_vdelay(struct cx88_tvnorm *norm)
@@ -648,24 +648,33 @@ static unsigned int inline norm_vdelay(struct cx88_tvnorm *norm)
 
 static unsigned int inline norm_fsc8(struct cx88_tvnorm *norm)
 {
-        static const unsigned int ntsc = 28636360;
-        static const unsigned int pal  = 35468950;
-        static const unsigned int palm  = 28604892;
-
         if (norm->id & V4L2_STD_PAL_M)
-                return palm;
+                return 28604892;      // 3.575611 MHz
+
+        if (norm->id & (V4L2_STD_PAL_Nc))
+                return 28656448;      // 3.582056 MHz
+
+        if (norm->id & V4L2_STD_NTSC) // All NTSC/M and variants
+                return 28636360;      // 3.57954545 MHz +/- 10 Hz
 
-        return (norm->id & V4L2_STD_625_50) ? pal : ntsc;
+        /* SECAM have also different sub carrier for chroma,
+           but step_db and step_dr, at cx88_set_tvnorm already handles that.
+
+           The same FSC applies to PAL/BGDKIH, PAL/60, NTSC/4.43 and PAL/N
+         */
+
+        return 35468950;      // 4.43361875 MHz +/- 5 Hz
 }
 
 static unsigned int inline norm_htotal(struct cx88_tvnorm *norm)
 {
-        /* Should always be Line Draw Time / (4*FSC) */
 
-        if (norm->id & V4L2_STD_PAL_M)
-                return 909;
+        unsigned int fsc4=norm_fsc8(norm)/2;
 
-        return (norm->id & V4L2_STD_625_50) ? 1135 : 910;
+        /* returns 4*FSC / vtotal / frames per seconds */
+        return (norm->id & V4L2_STD_625_50) ?
+                                ((fsc4+312)/625+12)/25 :
+                                ((fsc4+262)/525*1001+15000)/30000;
 }
 
 static unsigned int inline norm_vbipack(struct cx88_tvnorm *norm)
@@ -692,7 +701,7 @@ int cx88_set_scale(struct cx88_core *core, unsigned int width, unsigned int heig
         value &= 0x3fe;
         cx_write(MO_HDELAY_EVEN,  value);
         cx_write(MO_HDELAY_ODD,   value);
-        dprintk(1,"set_scale: hdelay  0x%04x\n", value);
+        dprintk(1,"set_scale: hdelay  0x%04x (width %d)\n", value,swidth);
 
         value = (swidth * 4096 / width) - 4096;
         cx_write(MO_HSCALE_EVEN,  value);
diff --git a/drivers/media/video/cx88/cx88.h b/drivers/media/video/cx88/cx88.h
index 7054e941f1d7..a9575ad8ca27 100644
--- a/drivers/media/video/cx88/cx88.h
+++ b/drivers/media/video/cx88/cx88.h
@@ -91,7 +91,7 @@ struct cx88_tvnorm {
 
 static unsigned int inline norm_maxw(struct cx88_tvnorm *norm)
 {
-        return (norm->id & V4L2_STD_625_50) ? 768 : 640;
+        return (norm->id & (V4L2_STD_MN & ~V4L2_STD_PAL_Nc)) ? 720 : 768;
 }