diff options
| -rw-r--r-- | drivers/media/video/cx18/cx18-av-core.c | 69 |
1 files changed, 48 insertions, 21 deletions
diff --git a/drivers/media/video/cx18/cx18-av-core.c b/drivers/media/video/cx18/cx18-av-core.c index 33ec269a0f5..0b3d840cc2e 100644 --- a/drivers/media/video/cx18/cx18-av-core.c +++ b/drivers/media/video/cx18/cx18-av-core.c @@ -277,8 +277,15 @@ void cx18_av_std_setup(struct cx18 *cx) struct cx18_av_state *state = &cx->av_state; struct v4l2_subdev *sd = &state->sd; v4l2_std_id std = state->std; + + /* + * Video ADC crystal clock to pixel clock SRC decimation ratio + * 28.636360 MHz/13.5 Mpps * 256 = 0x21f.07b + */ + const int src_decimation = 0x21f; + int hblank, hactive, burst, vblank, vactive, sc; - int vblank656, src_decimation; + int vblank656; int luma_lpf, uv_lpf, comb; u32 pll_int, pll_frac, pll_post; @@ -342,21 +349,31 @@ void cx18_av_std_setup(struct cx18 *cx) hblank = 132; hactive = 720; + /* + * Burst gate delay (for 625 line systems) + * Hsync leading edge to color burst rise = 5.6 us + * Color burst width = 2.25 us + * Gate width = 4 pixel clocks + * (5.6 us + 2.25/2 us) * 13.5 Mpps + 4/2 clocks = 92.79 clocks + */ burst = 93; luma_lpf = 2; - src_decimation = 0x21f; if (std & V4L2_STD_PAL) { uv_lpf = 1; comb = 0x20; - sc = 688739; + /* sc = 4433618.75 * src_decimation/28636360 * 2^13 */ + sc = 688700; } else if (std == V4L2_STD_PAL_Nc) { uv_lpf = 1; comb = 0x20; - sc = 556453; + /* sc = 3582056.25 * src_decimation/28636360 * 2^13 */ + sc = 556422; } else { /* SECAM */ uv_lpf = 0; comb = 0; - sc = 672351; + /* (fr + fb)/2 = (4406260 + 4250000)/2 = 4328130 */ + /* sc = 4328130 * src_decimation/28636360 * 2^13 */ + sc = 672314; } } else { /* @@ -394,20 +411,30 @@ void cx18_av_std_setup(struct cx18 *cx) luma_lpf = 1; uv_lpf = 1; - src_decimation = 0x21f; + /* + * Burst gate delay (for 525 line systems) + * Hsync leading edge to color burst rise = 5.3 us + * Color burst width = 2.5 us + * Gate width = 4 pixel clocks + * (5.3 us + 2.5/2 us) * 13.5 Mpps + 4/2 clocks = 90.425 clocks + */ if (std == V4L2_STD_PAL_60) { - burst = 0x5b; + burst = 90; luma_lpf = 2; comb = 0x20; - sc = 688739; + /* sc = 4433618.75 * src_decimation/28636360 * 2^13 */ + sc = 688700; } else if (std == V4L2_STD_PAL_M) { - burst = 0x61; + /* The 97 needs to be verified against PAL-M timings */ + burst = 97; comb = 0x20; - sc = 555452; + /* sc = 3575611.49 * src_decimation/28636360 * 2^13 */ + sc = 555421; } else { - burst = 0x5b; + burst = 90; comb = 0x66; - sc = 556063; + /* sc = 3579545.45.. * src_decimation/28636360 * 2^13 */ + sc = 556032; } } @@ -419,23 +446,23 @@ void cx18_av_std_setup(struct cx18 *cx) pll_int, pll_frac, pll_post); if (pll_post) { - int fin, fsc, pll; + int fsc, pll; pll = (28636360L * ((((u64)pll_int) << 25) + pll_frac)) >> 25; pll /= pll_post; - CX18_DEBUG_INFO_DEV(sd, "PLL = %d.%06d MHz\n", + CX18_DEBUG_INFO_DEV(sd, "Video PLL = %d.%06d MHz\n", pll / 1000000, pll % 1000000); - CX18_DEBUG_INFO_DEV(sd, "PLL/8 = %d.%06d MHz\n", + CX18_DEBUG_INFO_DEV(sd, "Pixel rate = %d.%06d Mpixel/sec\n", pll / 8000000, (pll / 8) % 1000000); - fin = ((u64)src_decimation * pll) >> 12; - CX18_DEBUG_INFO_DEV(sd, "ADC Sampling freq = %d.%06d MHz\n", - fin / 1000000, fin % 1000000); + CX18_DEBUG_INFO_DEV(sd, "ADC XTAL/pixel clock decimation ratio " + "= %d.%03d\n", src_decimation / 256, + ((src_decimation % 256) * 1000) / 256); - fsc = (((u64)sc) * pll) >> 24L; + fsc = ((((u64)sc) * 28636360)/src_decimation) >> 13L; CX18_DEBUG_INFO_DEV(sd, - "Chroma sub-carrier freq = %d.%06d MHz\n", - fsc / 1000000, fsc % 1000000); + "Chroma sub-carrier initial freq = %d.%06d " + "MHz\n", fsc / 1000000, fsc % 1000000); CX18_DEBUG_INFO_DEV(sd, "hblank %i, hactive %i, vblank %i, " "vactive %i, vblank656 %i, src_dec %i, " |