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Over Sampling Rate (OSR) is defined as CLK_ADC frequency divided by the audio sample rate (Fs). OSR = CLK_ADC / FS The available OSRs are 32, 64, 128 or 256. Note that the OSR and Fs values must be selected such that the maximum frequency of CLK_ADC is less than 6.144 MHz. It is recommended to match the relationship between OSR and clock SRC according to following Table. ADC_RATE: 00(OSR=32) | CLK_ADC_SRC: 11(CODEC 1/8) ADC_RATE: 01(OSR=64) | CLK_ADC_SRC: 10(CODEC1/4) ADC_RATE: 10(OSR=128) | CLK_ADC_SRC: 01(CODEC 1/2) ADC_RATE: 11(OSR=256) | CLK_ADC_SRC: 00(CODEC CLK) The over sampling rate about DAC follows the same rule with ADCs. The driver changes the OSR to 64 value when initiation for better FLL performance and applies the dynamic SRC change by different OSR. Signed-off-by: John Hsu <KCHSU0@nuvoton.com> Signed-off-by: Mark Brown <broonie@kernel.org> |
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| .. | ||
| aoa | ||
| arm | ||
| atmel | ||
| core | ||
| drivers | ||
| firewire | ||
| hda | ||
| i2c | ||
| isa | ||
| mips | ||
| oss | ||
| parisc | ||
| pci | ||
| pcmcia | ||
| ppc | ||
| sh | ||
| soc | ||
| sparc | ||
| spi | ||
| synth | ||
| usb | ||
| ac97_bus.c | ||
| Kconfig | ||
| last.c | ||
| Makefile | ||
| sound_core.c | ||