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V4L/DVB (8462): cx18: Lock the aux PLL to the video pixle rate for analog captures

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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>
This commit is contained in:
Andy Walls 2008-07-25 15:03:08 -03:00 committed by Mauro Carvalho Chehab
parent f8f6296ada
commit 35f92b2af8
1 changed files with 70 additions and 10 deletions
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80
drivers/media/video/cx18/cx18-av-audio.c
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@ -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;
}
}