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V4L/DVB (8461): cx18: Fix 32 kHz audio sample output rate for analog tuner SIF input

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cx18: Fix 32 kHz audio sample output rate for analog tuner SIF input so it
works.  The AUX_PLL VCO was being operated at 196.6 MHz out of the spec'ed
200-600 MHz range.  Fixed the multipler and post dividers to operate the VCO
within specification and added comments on how magic numbers are derived.

Thanks to Hans Verkuil for pointing out this interesting problem to solve.

Signed-off-by: Andy Walls <awalls@radix.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Andy Walls 2008-07-23 20:28:23 -03:00 committed by Mauro Carvalho Chehab
parent fff4205f1d
commit f8f6296ada
1 changed files with 29 additions and 12 deletions
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41
drivers/media/video/cx18/cx18-av-audio.c
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@ -30,7 +30,6 @@ static int set_audclk_freq(struct cx18 *cx, u32 freq)
if (freq != 32000 && freq != 44100 && freq != 48000)
return -EINVAL;
/* common for all inputs and rates */
/* SA_MCLK_SEL=1, SA_MCLK_DIV=0x10 */
cx18_av_write(cx, 0x127, 0x50);
@ -38,15 +37,20 @@ static int set_audclk_freq(struct cx18 *cx, u32 freq)
switch (freq) {
case 32000:
/* VID_PLL and AUX_PLL */
cx18_av_write4(cx, 0x108, 0x1006040f);
cx18_av_write4(cx, 0x108, 0x1408040f);
/* AUX_PLL_FRAC */
cx18_av_write4(cx, 0x110, 0x01bb39ee);
/* 0x8.9504318a * 28,636,363.636 / 0x14 = 32000 * 384 */
cx18_av_write4(cx, 0x110, 0x012a0863);
/* src3/4/6_ctl = 0x0801f77f */
/* src3/4/6_ctl */
/* 0x1.f77f = (4 * 15734.26) / 32000 */
cx18_av_write4(cx, 0x900, 0x0801f77f);
cx18_av_write4(cx, 0x904, 0x0801f77f);
cx18_av_write4(cx, 0x90c, 0x0801f77f);
/* SA_MCLK_SEL=1, SA_MCLK_DIV=0x14 */
cx18_av_write(cx, 0x127, 0x54);
break;
case 44100:
@ -54,9 +58,11 @@ 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);
/* src3/4/6_ctl = 0x08016d59 */
/* 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);
@ -67,9 +73,11 @@ 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);
/* src3/4/6_ctl = 0x08014faa */
/* 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);
@ -82,12 +90,15 @@ 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);
/* src1_ctl = 0x08010000 */
/* src1_ctl */
/* 0x1.0000 = 32000/32000 */
cx18_av_write4(cx, 0x8f8, 0x08010000);
/* src3/4/6_ctl = 0x08020000 */
/* src3/4/6_ctl */
/* 0x2.0000 = 2 * (32000/32000) */
cx18_av_write4(cx, 0x900, 0x08020000);
cx18_av_write4(cx, 0x904, 0x08020000);
cx18_av_write4(cx, 0x90c, 0x08020000);
@ -101,12 +112,15 @@ 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);
/* src1_ctl = 0x08010000 */
/* src1_ctl */
/* 0x1.60cd = 44100/32000 */
cx18_av_write4(cx, 0x8f8, 0x080160cd);
/* src3/4/6_ctl = 0x08020000 */
/* src3/4/6_ctl */
/* 0x1.7385 = 2 * (32000/44100) */
cx18_av_write4(cx, 0x900, 0x08017385);
cx18_av_write4(cx, 0x904, 0x08017385);
cx18_av_write4(cx, 0x90c, 0x08017385);
@ -117,12 +131,15 @@ 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);
/* src1_ctl = 0x08010000 */
/* src1_ctl */
/* 0x1.8000 = 48000/32000 */
cx18_av_write4(cx, 0x8f8, 0x08018000);
/* src3/4/6_ctl = 0x08020000 */
/* src3/4/6_ctl */
/* 0x1.5555 = 2 * (32000/48000) */
cx18_av_write4(cx, 0x900, 0x08015555);
cx18_av_write4(cx, 0x904, 0x08015555);
cx18_av_write4(cx, 0x90c, 0x08015555);