From 75e626f6a8de25ae7225cf0510c96d1fac4f23aa Mon Sep 17 00:00:00 2001 From: Andy Walls Date: Fri, 25 Jul 2008 14:03:08 -0400 Subject: cx18: Lock the aux PLL to the video pixle rate for analog captures From: Andy Walls 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 --- linux/drivers/media/video/cx18/cx18-av-audio.c | 80 ++++++++++++++++++++++---- 1 file changed, 70 insertions(+), 10 deletions(-) (limited to 'linux') diff --git a/linux/drivers/media/video/cx18/cx18-av-audio.c b/linux/drivers/media/video/cx18/cx18-av-audio.c index 7245d37ef..0b5583788 100644 --- a/linux/drivers/media/video/cx18/cx18-av-audio.c +++ b/linux/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; } } -- cgit v1.2.3