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>
This commit is contained in:
Andy Walls
Mauro Carvalho Chehab
parent
f8f6296ada
commit
35f92b2af8
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@ -51,6 +51,16 @@ static int set_audclk_freq(struct cx18 *cx, u32 freq)
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/* SA_MCLK_SEL=1, SA_MCLK_DIV=0x14 */
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cx18_av_write(cx, 0x127, 0x54);
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/* AUD_COUNT = 0x2fff = 8 samples * 4 * 384 - 1 */
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cx18_av_write4(cx, 0x12c, 0x11202fff);
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/*
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* EN_AV_LOCK = 1
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* VID_COUNT = 0x0d2ef8 = 107999.000 * 8 =
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* ((8 samples/32,000) * (13,500,000 * 8) * 4 - 1) * 8
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*/
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cx18_av_write4(cx, 0x128, 0xa10d2ef8);
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break;
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case 44100:
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@ -58,14 +68,24 @@ static int set_audclk_freq(struct cx18 *cx, u32 freq)
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cx18_av_write4(cx, 0x108, 0x1009040f);
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/* AUX_PLL_FRAC */
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/* 0x9.7635eb * 28,636,363 / 0x10 = 44100 * 384 */
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cx18_av_write4(cx, 0x110, 0x00ec6bd6);
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/* 0x9.7635e7 * 28,636,363.63 / 0x10 = 44100 * 384 */
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cx18_av_write4(cx, 0x110, 0x00ec6bce);
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/* src3/4/6_ctl */
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/* 0x1.6d59 = (4 * 15734.26) / 44100 */
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cx18_av_write4(cx, 0x900, 0x08016d59);
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cx18_av_write4(cx, 0x904, 0x08016d59);
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cx18_av_write4(cx, 0x90c, 0x08016d59);
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/* AUD_COUNT = 0x92ff = 49 samples * 2 * 384 - 1 */
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cx18_av_write4(cx, 0x12c, 0x112092ff);
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/*
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* EN_AV_LOCK = 1
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* VID_COUNT = 0x1d4bf8 = 239999.000 * 8 =
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* ((49 samples/44,100) * (13,500,000 * 8) * 2 - 1) * 8
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*/
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cx18_av_write4(cx, 0x128, 0xa11d4bf8);
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break;
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case 48000:
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@ -73,14 +93,24 @@ static int set_audclk_freq(struct cx18 *cx, u32 freq)
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cx18_av_write4(cx, 0x108, 0x100a040f);
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/* AUX_PLL_FRAC */
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/* 0xa.4c6b728 * 28,636,363 / 0x10 = 48000 * 384 */
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cx18_av_write4(cx, 0x110, 0x0098d6e5);
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/* 0xa.4c6b6ea * 28,636,363.63 / 0x10 = 48000 * 384 */
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cx18_av_write4(cx, 0x110, 0x0098d6dd);
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/* src3/4/6_ctl */
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/* 0x1.4faa = (4 * 15734.26) / 48000 */
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cx18_av_write4(cx, 0x900, 0x08014faa);
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cx18_av_write4(cx, 0x904, 0x08014faa);
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cx18_av_write4(cx, 0x90c, 0x08014faa);
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/* AUD_COUNT = 0x5fff = 4 samples * 16 * 384 - 1 */
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cx18_av_write4(cx, 0x12c, 0x11205fff);
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/*
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* EN_AV_LOCK = 1
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* VID_COUNT = 0x1193f8 = 143999.000 * 8 =
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* ((4 samples/48,000) * (13,500,000 * 8) * 16 - 1) * 8
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*/
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cx18_av_write4(cx, 0x128, 0xa11193f8);
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break;
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}
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} else {
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@ -90,8 +120,8 @@ static int set_audclk_freq(struct cx18 *cx, u32 freq)
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cx18_av_write4(cx, 0x108, 0x1e08040f);
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/* AUX_PLL_FRAC */
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/* 0x8.9504348 * 28,636,363 / 0x1e = 32000 * 256 */
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cx18_av_write4(cx, 0x110, 0x012a0869);
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/* 0x8.9504318 * 28,636,363.63 / 0x1e = 32000 * 256 */
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cx18_av_write4(cx, 0x110, 0x012a0863);
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/* src1_ctl */
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/* 0x1.0000 = 32000/32000 */
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@ -105,6 +135,16 @@ static int set_audclk_freq(struct cx18 *cx, u32 freq)
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/* SA_MCLK_SEL=1, SA_MCLK_DIV=0x14 */
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cx18_av_write(cx, 0x127, 0x54);
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/* AUD_COUNT = 0x1fff = 8 samples * 4 * 256 - 1 */
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cx18_av_write4(cx, 0x12c, 0x11201fff);
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/*
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* EN_AV_LOCK = 1
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* VID_COUNT = 0x0d2ef8 = 107999.000 * 8 =
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* ((8 samples/32,000) * (13,500,000 * 8) * 4 - 1) * 8
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*/
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cx18_av_write4(cx, 0x128, 0xa10d2ef8);
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break;
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case 44100:
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@ -112,8 +152,8 @@ static int set_audclk_freq(struct cx18 *cx, u32 freq)
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cx18_av_write4(cx, 0x108, 0x1809040f);
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/* AUX_PLL_FRAC */
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/* 0x9.76346B * 28,636,363 / 0x18 = 44100 * 256 */
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cx18_av_write4(cx, 0x110, 0x00ec6bd6);
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/* 0x9.7635e74 * 28,636,363.63 / 0x18 = 44100 * 256 */
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cx18_av_write4(cx, 0x110, 0x00ec6bce);
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/* src1_ctl */
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/* 0x1.60cd = 44100/32000 */
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@ -124,6 +164,16 @@ static int set_audclk_freq(struct cx18 *cx, u32 freq)
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cx18_av_write4(cx, 0x900, 0x08017385);
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cx18_av_write4(cx, 0x904, 0x08017385);
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cx18_av_write4(cx, 0x90c, 0x08017385);
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/* AUD_COUNT = 0x61ff = 49 samples * 2 * 256 - 1 */
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cx18_av_write4(cx, 0x12c, 0x112061ff);
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/*
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* EN_AV_LOCK = 1
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* VID_COUNT = 0x1d4bf8 = 239999.000 * 8 =
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* ((49 samples/44,100) * (13,500,000 * 8) * 2 - 1) * 8
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*/
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cx18_av_write4(cx, 0x128, 0xa11d4bf8);
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break;
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case 48000:
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@ -131,8 +181,8 @@ static int set_audclk_freq(struct cx18 *cx, u32 freq)
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cx18_av_write4(cx, 0x108, 0x180a040f);
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/* AUX_PLL_FRAC */
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/* 0xa.4c6b728 * 28,636,363 / 0x18 = 48000 * 256 */
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cx18_av_write4(cx, 0x110, 0x0098d6e5);
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/* 0xa.4c6b6ea * 28,636,363.63 / 0x18 = 48000 * 256 */
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cx18_av_write4(cx, 0x110, 0x0098d6dd);
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/* src1_ctl */
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/* 0x1.8000 = 48000/32000 */
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@ -143,6 +193,16 @@ static int set_audclk_freq(struct cx18 *cx, u32 freq)
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cx18_av_write4(cx, 0x900, 0x08015555);
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cx18_av_write4(cx, 0x904, 0x08015555);
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cx18_av_write4(cx, 0x90c, 0x08015555);
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/* AUD_COUNT = 0x3fff = 4 samples * 16 * 256 - 1 */
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cx18_av_write4(cx, 0x12c, 0x11203fff);
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/*
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* EN_AV_LOCK = 1
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* VID_COUNT = 0x1193f8 = 143999.000 * 8 =
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* ((4 samples/48,000) * (13,500,000 * 8) * 16 - 1) * 8
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*/
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cx18_av_write4(cx, 0x128, 0xa11193f8);
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break;
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}
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}
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