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Commit 407c71b6 authored by John Hsu's avatar John Hsu Committed by Mark Brown
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ASoC: nau8825: improve FLL function for better performance 



In FLL calculation, increase VCO/DCO frequency for better performance.
Besides, have different register configuration according to fraction or not
when apply FLL parameters.

Signed-off-by: default avatarJohn Hsu <KCHSU0@nuvoton.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 70543c30

sound/soc/codecs/nau8825.c

+34 −13
Original line number Diff line number Diff line
@@ -31,7 +31,7 @@ 
#include "nau8825.h"



#define NAU_FREF_MAX 13500000

#define NAU_FVCO_MAX 100000000

#define NAU_FVCO_MAX 124000000

#define NAU_FVCO_MIN 90000000



struct nau8825_fll {
@@ -973,8 +973,8 @@ static int nau8825_codec_probe(struct snd_soc_codec *codec) 
static int nau8825_calc_fll_param(unsigned int fll_in, unsigned int fs,

		struct nau8825_fll *fll_param)

{

	u64 fvco;

	unsigned int fref, i;

	u64 fvco, fvco_max;

	unsigned int fref, i, fvco_sel;



	/* Ensure the reference clock frequency (FREF) is <= 13.5MHz by dividing

	 * freq_in by 1, 2, 4, or 8 using FLL pre-scalar.
@@ -999,18 +999,23 @@ static int nau8825_calc_fll_param(unsigned int fll_in, unsigned int fs, 
	fll_param->ratio = fll_ratio[i].val;



	/* Calculate the frequency of DCO (FDCO) given freq_out = 256 * Fs.

	 * FDCO must be within the 90MHz - 100MHz or the FFL cannot be

	 * FDCO must be within the 90MHz - 124MHz or the FFL cannot be

	 * guaranteed across the full range of operation.

	 * FDCO = freq_out * 2 * mclk_src_scaling

	 */

	fvco_max = 0;

	fvco_sel = ARRAY_SIZE(mclk_src_scaling);

	for (i = 0; i < ARRAY_SIZE(mclk_src_scaling); i++) {

		fvco = 256 * fs * 2 * mclk_src_scaling[i].param;

		if (NAU_FVCO_MIN < fvco && fvco < NAU_FVCO_MAX)

			break;

		if (fvco > NAU_FVCO_MIN && fvco < NAU_FVCO_MAX &&

			fvco_max < fvco) {

			fvco_max = fvco;

			fvco_sel = i;

		}

	}

	if (i == ARRAY_SIZE(mclk_src_scaling))

	if (ARRAY_SIZE(mclk_src_scaling) == fvco_sel)

		return -EINVAL;

	fll_param->mclk_src = mclk_src_scaling[i].val;

	fll_param->mclk_src = mclk_src_scaling[fvco_sel].val;



	/* Calculate the FLL 10-bit integer input and the FLL 16-bit fractional

	 * input based on FDCO, FREF and FLL ratio.
@@ -1025,7 +1030,8 @@ static void nau8825_fll_apply(struct nau8825 *nau8825, 
		struct nau8825_fll *fll_param)

{

	regmap_update_bits(nau8825->regmap, NAU8825_REG_CLK_DIVIDER,

		NAU8825_CLK_MCLK_SRC_MASK, fll_param->mclk_src);

		NAU8825_CLK_SRC_MASK | NAU8825_CLK_MCLK_SRC_MASK,

		NAU8825_CLK_SRC_MCLK | fll_param->mclk_src);

	regmap_update_bits(nau8825->regmap, NAU8825_REG_FLL1,

			NAU8825_FLL_RATIO_MASK, fll_param->ratio);

	/* FLL 16-bit fractional input */
@@ -1038,10 +1044,25 @@ static void nau8825_fll_apply(struct nau8825 *nau8825, 
			NAU8825_FLL_REF_DIV_MASK, fll_param->clk_ref_div);

	/* select divided VCO input */

	regmap_update_bits(nau8825->regmap, NAU8825_REG_FLL5,

			NAU8825_FLL_FILTER_SW_MASK, 0x0000);

	/* FLL sigma delta modulator enable */

		NAU8825_FLL_CLK_SW_MASK, NAU8825_FLL_CLK_SW_REF);

	/* Disable free-running mode */

	regmap_update_bits(nau8825->regmap,

		NAU8825_REG_FLL6, NAU8825_DCO_EN, 0);

	if (fll_param->fll_frac) {

		regmap_update_bits(nau8825->regmap, NAU8825_REG_FLL5,

			NAU8825_FLL_PDB_DAC_EN | NAU8825_FLL_LOOP_FTR_EN |

			NAU8825_FLL_FTR_SW_MASK,

			NAU8825_FLL_PDB_DAC_EN | NAU8825_FLL_LOOP_FTR_EN |

			NAU8825_FLL_FTR_SW_FILTER);

		regmap_update_bits(nau8825->regmap, NAU8825_REG_FLL6,

			NAU8825_SDM_EN_MASK, NAU8825_SDM_EN);

			NAU8825_SDM_EN, NAU8825_SDM_EN);

	} else {

		regmap_update_bits(nau8825->regmap, NAU8825_REG_FLL5,

			NAU8825_FLL_PDB_DAC_EN | NAU8825_FLL_LOOP_FTR_EN |

			NAU8825_FLL_FTR_SW_MASK, NAU8825_FLL_FTR_SW_ACCU);

		regmap_update_bits(nau8825->regmap,

			NAU8825_REG_FLL6, NAU8825_SDM_EN, 0);

	}

}



/* freq_out must be 256*Fs in order to achieve the best performance */

sound/soc/codecs/nau8825.h

+8 −5
Original line number Diff line number Diff line
@@ -123,15 +123,18 @@ 
#define NAU8825_FLL_REF_DIV_MASK		(0x3 << 10)



/* FLL5 (0x08) */

#define NAU8825_FLL_FILTER_SW_MASK		(0x1 << 14)

#define NAU8825_FLL_PDB_DAC_EN		(0x1 << 15)

#define NAU8825_FLL_LOOP_FTR_EN		(0x1 << 14)

#define NAU8825_FLL_CLK_SW_MASK		(0x1 << 13)

#define NAU8825_FLL_CLK_SW_N2			(0x1 << 13)

#define NAU8825_FLL_CLK_SW_REF		(0x0 << 13)

#define NAU8825_FLL_FTR_SW_MASK		(0x1 << 12)

#define NAU8825_FLL_FTR_SW_ACCU		(0x1 << 12)

#define NAU8825_FLL_FTR_SW_FILTER		(0x0 << 12)



/* FLL6 (0x9) */

#define NAU8825_DCO_EN_MASK			(0x1 << 15)

#define NAU8825_DCO_EN				(0x1 << 15)

#define NAU8825_DCO_DIS				(0x0 << 15)

#define NAU8825_SDM_EN_MASK			(0x1 << 14)

#define NAU8825_SDM_EN				(0x1 << 14)

#define NAU8825_SDM_DIS				(0x0 << 14)



/* HSD_CTRL (0xc) */

#define NAU8825_HSD_AUTO_MODE	(1 << 6)