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| author | Antti Palosaari <crope@iki.fi> | 2013-07-31 21:48:51 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <m.chehab@samsung.com> | 2013-08-20 16:01:52 -0300 |
| commit | 22ca680e02aceb88d939b1eb1bbe3e94b71bf555 (patch) | |
| tree | 73660253d8593cf876c88f78ebcaae8d70e77328 /drivers/staging | |
| parent | 6450e5091c6dfc12afc164e8225b7677b1b1a422 (diff) | |
| download | linux-22ca680e02aceb88d939b1eb1bbe3e94b71bf555.tar.gz linux-22ca680e02aceb88d939b1eb1bbe3e94b71bf555.tar.bz2 linux-22ca680e02aceb88d939b1eb1bbe3e94b71bf555.zip | |
[media] msi3101: correct ADC sampling rate calc a little bit
No need to compare numbers, we could just store that fractional
value MSB directly.
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Diffstat (limited to 'drivers/staging')
| -rw-r--r-- | drivers/staging/media/msi3101/sdr-msi3101.c | 23 |
1 files changed, 8 insertions, 15 deletions
diff --git a/drivers/staging/media/msi3101/sdr-msi3101.c b/drivers/staging/media/msi3101/sdr-msi3101.c index 2b73fc1f39f4..04bbbdf0acd3 100644 --- a/drivers/staging/media/msi3101/sdr-msi3101.c +++ b/drivers/staging/media/msi3101/sdr-msi3101.c @@ -987,7 +987,7 @@ static int msi3101_tuner_write(struct msi3101_state *s, u32 data) #define DIV_R_IN 2 static int msi3101_set_usb_adc(struct msi3101_state *s) { - int ret, div_n, div_m, div_r_out, f_sr, f_vco; + int ret, div_n, div_m, div_r_out, f_sr, f_vco, fract; u32 reg4, reg3; /* * Synthesizer config is just a educated guess... @@ -998,7 +998,7 @@ static int msi3101_set_usb_adc(struct msi3101_state *s) * [12:10] output divider * [13] 0 ? * [14] 0 ? - * [15] increase sr by max fract + * [15] fractional MSB, bit 20 * [16:19] N * [23:20] ? * [24:31] 0x01 @@ -1019,6 +1019,7 @@ static int msi3101_set_usb_adc(struct msi3101_state *s) f_sr = s->ctrl_sampling_rate->val64; reg3 = 0x01c00303; + reg4 = 0x00000004; for (div_r_out = 4; div_r_out < 16; div_r_out += 2) { f_vco = f_sr * div_r_out * 12; @@ -1030,24 +1031,16 @@ static int msi3101_set_usb_adc(struct msi3101_state *s) div_n = f_vco / (F_REF * DIV_R_IN); div_m = f_vco % (F_REF * DIV_R_IN); + fract = 0x200000ul * div_m / (F_REF * DIV_R_IN); reg3 |= div_n << 16; reg3 |= (div_r_out / 2 - 1) << 10; - reg4 = 0x0ffffful * div_m / F_REF; - - if (reg4 >= 0x0ffffful) { - dev_dbg(&s->udev->dev, - "%s: extending fractional part value %08x\n", - __func__, reg4); - reg4 -= 0x0ffffful; - reg3 |= 1 << 15; - } - - reg4 = (reg4 << 8) | 0x04; + reg3 |= ((fract >> 20) & 0x000001) << 15; /* [20] */ + reg4 |= ((fract >> 0) & 0x0fffff) << 8; /* [19:0] */ dev_dbg(&s->udev->dev, - "%s: f_sr=%d f_vco=%d div_n=%d div_m=%d div_r_out=%d reg4=%08x\n", - __func__, f_sr, f_vco, div_n, div_m, div_r_out, reg4); + "%s: f_sr=%d f_vco=%d div_n=%d div_m=%d div_r_out=%d reg3=%08x reg4=%08x\n", + __func__, f_sr, f_vco, div_n, div_m, div_r_out, reg3, reg4); ret = msi3101_ctrl_msg(s, CMD_WREG, 0x00608008); if (ret) |