summaryrefslogtreecommitdiffstats
path: root/drivers
diff options
context:
space:
mode:
authorAndy Walls <awalls@radix.net>2008-07-25 15:03:08 -0300
committerMauro Carvalho Chehab <mchehab@infradead.org>2008-07-26 12:54:19 -0300
commit35f92b2af8230ffc1146e2317e2068fefd7caacb (patch)
treea93b3228c65d4f1f9af49716c2ac178d1836b4c9 /drivers
parentf8f6296adad30cadd65555dfde489d1080b2001c (diff)
V4L/DVB (8462): cx18: Lock the aux PLL to the video pixle rate for analog captures
cx18: Lock the aux PLL to the video pixel rate for analog captures. The datasheet for the CX25840 says this is important for MPEG encoding applications. To ensure the PLL locking was correct, also fixed the aux PLL's multiplier to be computed based on a precise crystal freq of 4.5 MHz/286 * 455/2 * 8 = 28636363.6363... instead of the imporperly rounded 28636363. Signed-off-by: Andy Walls <awalls@radix.net> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/media/video/cx18/cx18-av-audio.c80
1 files changed, 70 insertions, 10 deletions
diff --git a/drivers/media/video/cx18/cx18-av-audio.c b/drivers/media/video/cx18/cx18-av-audio.c
index 7245d37ef34..0b55837880a 100644
--- a/drivers/media/video/cx18/cx18-av-audio.c
+++ b/drivers/media/video/cx18/cx18-av-audio.c
@@ -51,6 +51,16 @@ static int set_audclk_freq(struct cx18 *cx, u32 freq)
/* SA_MCLK_SEL=1, SA_MCLK_DIV=0x14 */
cx18_av_write(cx, 0x127, 0x54);
+
+ /* AUD_COUNT = 0x2fff = 8 samples * 4 * 384 - 1 */
+ cx18_av_write4(cx, 0x12c, 0x11202fff);
+
+ /*
+ * EN_AV_LOCK = 1
+ * VID_COUNT = 0x0d2ef8 = 107999.000 * 8 =
+ * ((8 samples/32,000) * (13,500,000 * 8) * 4 - 1) * 8
+ */
+ cx18_av_write4(cx, 0x128, 0xa10d2ef8);
break;
case 44100:
@@ -58,14 +68,24 @@ static int set_audclk_freq(struct cx18 *cx, u32 freq)
cx18_av_write4(cx, 0x108, 0x1009040f);
/* AUX_PLL_FRAC */
- /* 0x9.7635eb * 28,636,363 / 0x10 = 44100 * 384 */
- cx18_av_write4(cx, 0x110, 0x00ec6bd6);
+ /* 0x9.7635e7 * 28,636,363.63 / 0x10 = 44100 * 384 */
+ cx18_av_write4(cx, 0x110, 0x00ec6bce);
/* src3/4/6_ctl */
/* 0x1.6d59 = (4 * 15734.26) / 44100 */
cx18_av_write4(cx, 0x900, 0x08016d59);
cx18_av_write4(cx, 0x904, 0x08016d59);
cx18_av_write4(cx, 0x90c, 0x08016d59);
+
+ /* AUD_COUNT = 0x92ff = 49 samples * 2 * 384 - 1 */
+ cx18_av_write4(cx, 0x12c, 0x112092ff);
+
+ /*
+ * EN_AV_LOCK = 1
+ * VID_COUNT = 0x1d4bf8 = 239999.000 * 8 =
+ * ((49 samples/44,100) * (13,500,000 * 8) * 2 - 1) * 8
+ */
+ cx18_av_write4(cx, 0x128, 0xa11d4bf8);
break;
case 48000:
@@ -73,14 +93,24 @@ static int set_audclk_freq(struct cx18 *cx, u32 freq)
cx18_av_write4(cx, 0x108, 0x100a040f);
/* AUX_PLL_FRAC */
- /* 0xa.4c6b728 * 28,636,363 / 0x10 = 48000 * 384 */
- cx18_av_write4(cx, 0x110, 0x0098d6e5);
+ /* 0xa.4c6b6ea * 28,636,363.63 / 0x10 = 48000 * 384 */
+ cx18_av_write4(cx, 0x110, 0x0098d6dd);
/* src3/4/6_ctl */
/* 0x1.4faa = (4 * 15734.26) / 48000 */
cx18_av_write4(cx, 0x900, 0x08014faa);
cx18_av_write4(cx, 0x904, 0x08014faa);
cx18_av_write4(cx, 0x90c, 0x08014faa);
+
+ /* AUD_COUNT = 0x5fff = 4 samples * 16 * 384 - 1 */
+ cx18_av_write4(cx, 0x12c, 0x11205fff);
+
+ /*
+ * EN_AV_LOCK = 1
+ * VID_COUNT = 0x1193f8 = 143999.000 * 8 =
+ * ((4 samples/48,000) * (13,500,000 * 8) * 16 - 1) * 8
+ */
+ cx18_av_write4(cx, 0x128, 0xa11193f8);
break;
}
} else {
@@ -90,8 +120,8 @@ static int set_audclk_freq(struct cx18 *cx, u32 freq)
cx18_av_write4(cx, 0x108, 0x1e08040f);
/* AUX_PLL_FRAC */
- /* 0x8.9504348 * 28,636,363 / 0x1e = 32000 * 256 */
- cx18_av_write4(cx, 0x110, 0x012a0869);
+ /* 0x8.9504318 * 28,636,363.63 / 0x1e = 32000 * 256 */
+ cx18_av_write4(cx, 0x110, 0x012a0863);
/* src1_ctl */
/* 0x1.0000 = 32000/32000 */
@@ -105,6 +135,16 @@ static int set_audclk_freq(struct cx18 *cx, u32 freq)
/* SA_MCLK_SEL=1, SA_MCLK_DIV=0x14 */
cx18_av_write(cx, 0x127, 0x54);
+
+ /* AUD_COUNT = 0x1fff = 8 samples * 4 * 256 - 1 */
+ cx18_av_write4(cx, 0x12c, 0x11201fff);
+
+ /*
+ * EN_AV_LOCK = 1
+ * VID_COUNT = 0x0d2ef8 = 107999.000 * 8 =
+ * ((8 samples/32,000) * (13,500,000 * 8) * 4 - 1) * 8
+ */
+ cx18_av_write4(cx, 0x128, 0xa10d2ef8);
break;
case 44100:
@@ -112,8 +152,8 @@ static int set_audclk_freq(struct cx18 *cx, u32 freq)
cx18_av_write4(cx, 0x108, 0x1809040f);
/* AUX_PLL_FRAC */
- /* 0x9.76346B * 28,636,363 / 0x18 = 44100 * 256 */
- cx18_av_write4(cx, 0x110, 0x00ec6bd6);
+ /* 0x9.7635e74 * 28,636,363.63 / 0x18 = 44100 * 256 */
+ cx18_av_write4(cx, 0x110, 0x00ec6bce);
/* src1_ctl */
/* 0x1.60cd = 44100/32000 */
@@ -124,6 +164,16 @@ static int set_audclk_freq(struct cx18 *cx, u32 freq)
cx18_av_write4(cx, 0x900, 0x08017385);
cx18_av_write4(cx, 0x904, 0x08017385);
cx18_av_write4(cx, 0x90c, 0x08017385);
+
+ /* AUD_COUNT = 0x61ff = 49 samples * 2 * 256 - 1 */
+ cx18_av_write4(cx, 0x12c, 0x112061ff);
+
+ /*
+ * EN_AV_LOCK = 1
+ * VID_COUNT = 0x1d4bf8 = 239999.000 * 8 =
+ * ((49 samples/44,100) * (13,500,000 * 8) * 2 - 1) * 8
+ */
+ cx18_av_write4(cx, 0x128, 0xa11d4bf8);
break;
case 48000:
@@ -131,8 +181,8 @@ static int set_audclk_freq(struct cx18 *cx, u32 freq)
cx18_av_write4(cx, 0x108, 0x180a040f);
/* AUX_PLL_FRAC */
- /* 0xa.4c6b728 * 28,636,363 / 0x18 = 48000 * 256 */
- cx18_av_write4(cx, 0x110, 0x0098d6e5);
+ /* 0xa.4c6b6ea * 28,636,363.63 / 0x18 = 48000 * 256 */
+ cx18_av_write4(cx, 0x110, 0x0098d6dd);
/* src1_ctl */
/* 0x1.8000 = 48000/32000 */
@@ -143,6 +193,16 @@ static int set_audclk_freq(struct cx18 *cx, u32 freq)
cx18_av_write4(cx, 0x900, 0x08015555);
cx18_av_write4(cx, 0x904, 0x08015555);
cx18_av_write4(cx, 0x90c, 0x08015555);
+
+ /* AUD_COUNT = 0x3fff = 4 samples * 16 * 256 - 1 */
+ cx18_av_write4(cx, 0x12c, 0x11203fff);
+
+ /*
+ * EN_AV_LOCK = 1
+ * VID_COUNT = 0x1193f8 = 143999.000 * 8 =
+ * ((4 samples/48,000) * (13,500,000 * 8) * 16 - 1) * 8
+ */
+ cx18_av_write4(cx, 0x128, 0xa11193f8);
break;
}
}