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ASoC: nau8825: FLL parameters finetune
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The driver fine-tune some parameters to improve FLL performance.
Those items have description as follow.
(1)ICTRL_LATCH: FLL DSP speed capability control
When FLL running at high frequency with long decimal number, DSP needs
to operate at high speed. FLL DSP can optimize between performance and
power consumption by ICTRL_LATCH.(111 has highest power consumption.)
The default setting can be used to reduce power.
(2)CUTOFF500: loop filter cutoff frequency at 500Khz
It will give the best FLL performance but highest power consumption
to enable the cutoff frequency. FLL Loop Filter enable to reduce FLL
output noise, especially,(DCO frequency)/(FLL input reference frequency)
is not a integer.
(3)GAIN_ERR: FLL gain error correction threshold setting
The threshold is comparison between DCO and target frequency.
The value 1111 has the most sensitive threshold, that is, 1111 can have
the most accurate DCO to target frequency. However, the gain error setting
conditionally and inversely depends on FLL input reference clock rate.
Higher FLL reference input frequency can only set lower gain error, such
as 0000 for input reference from MCLK=12.288Mhz. On the other side, if FLL
reference input is from Frame Sync, 48KHz, higher error gain can apply
such as 1111.

Signed-off-by: John Hsu <KCHSU0@nuvoton.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
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John Hsu authored and Mark Brown committed Nov 11, 2016
1 parent d6d1974 commit aee02c7
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Showing 2 changed files with 45 additions and 8 deletions.
48 changes: 40 additions & 8 deletions sound/soc/codecs/nau8825.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -1994,8 +1994,10 @@ static void nau8825_fll_apply(struct nau8825 *nau8825,
regmap_update_bits(nau8825->regmap, NAU8825_REG_CLK_DIVIDER,
NAU8825_CLK_SRC_MASK | NAU8825_CLK_MCLK_SRC_MASK,
NAU8825_CLK_SRC_MCLK | fll_param->mclk_src);
/* Make DSP operate at high speed for better performance. */
regmap_update_bits(nau8825->regmap, NAU8825_REG_FLL1,
NAU8825_FLL_RATIO_MASK, fll_param->ratio);
NAU8825_FLL_RATIO_MASK | NAU8825_ICTRL_LATCH_MASK,
fll_param->ratio | (0x6 << NAU8825_ICTRL_LATCH_SFT));
/* FLL 16-bit fractional input */
regmap_write(nau8825->regmap, NAU8825_REG_FLL2, fll_param->fll_frac);
/* FLL 10-bit integer input */
Expand All @@ -2011,19 +2013,22 @@ static void nau8825_fll_apply(struct nau8825 *nau8825,
regmap_update_bits(nau8825->regmap,
NAU8825_REG_FLL6, NAU8825_DCO_EN, 0);
if (fll_param->fll_frac) {
/* set FLL loop filter enable and cutoff frequency at 500Khz */
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, NAU8825_SDM_EN);
NAU8825_SDM_EN | NAU8825_CUTOFF500,
NAU8825_SDM_EN | NAU8825_CUTOFF500);
} else {
/* disable FLL loop filter and cutoff frequency */
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);
regmap_update_bits(nau8825->regmap, NAU8825_REG_FLL6,
NAU8825_SDM_EN | NAU8825_CUTOFF500, 0);
}
}

Expand Down Expand Up @@ -2089,6 +2094,9 @@ static void nau8825_configure_mclk_as_sysclk(struct regmap *regmap)
NAU8825_CLK_SRC_MASK, NAU8825_CLK_SRC_MCLK);
regmap_update_bits(regmap, NAU8825_REG_FLL6,
NAU8825_DCO_EN, 0);
/* Make DSP operate as default setting for power saving. */
regmap_update_bits(regmap, NAU8825_REG_FLL1,
NAU8825_ICTRL_LATCH_MASK, 0);
}

static int nau8825_configure_sysclk(struct nau8825 *nau8825, int clk_id,
Expand Down Expand Up @@ -2132,10 +2140,13 @@ static int nau8825_configure_sysclk(struct nau8825 *nau8825, int clk_id,
NAU8825_DCO_EN, NAU8825_DCO_EN);
regmap_update_bits(regmap, NAU8825_REG_CLK_DIVIDER,
NAU8825_CLK_SRC_MASK, NAU8825_CLK_SRC_VCO);
/* Decrease the VCO frequency for power saving */
/* Decrease the VCO frequency and make DSP operate
* as default setting for power saving.
*/
regmap_update_bits(regmap, NAU8825_REG_CLK_DIVIDER,
NAU8825_CLK_MCLK_SRC_MASK, 0xf);
regmap_update_bits(regmap, NAU8825_REG_FLL1,
NAU8825_ICTRL_LATCH_MASK |
NAU8825_FLL_RATIO_MASK, 0x10);
regmap_update_bits(regmap, NAU8825_REG_FLL6,
NAU8825_SDM_EN, NAU8825_SDM_EN);
Expand All @@ -2159,8 +2170,13 @@ static int nau8825_configure_sysclk(struct nau8825 *nau8825, int clk_id,
* preparation halted until cross talk process finish.
*/
nau8825_sema_acquire(nau8825, 2 * HZ);
/* Higher FLL reference input frequency can only set lower
* gain error, such as 0000 for input reference from MCLK
* 12.288Mhz.
*/
regmap_update_bits(regmap, NAU8825_REG_FLL3,
NAU8825_FLL_CLK_SRC_MASK, NAU8825_FLL_CLK_SRC_MCLK);
NAU8825_FLL_CLK_SRC_MASK | NAU8825_GAIN_ERR_MASK,
NAU8825_FLL_CLK_SRC_MCLK | 0);
/* Release the semaphone. */
nau8825_sema_release(nau8825);

Expand All @@ -2176,8 +2192,16 @@ static int nau8825_configure_sysclk(struct nau8825 *nau8825, int clk_id,
* preparation halted until cross talk process finish.
*/
nau8825_sema_acquire(nau8825, 2 * HZ);
/* If FLL reference input is from low frequency source,
* higher error gain can apply such as 0xf which has
* the most sensitive gain error correction threshold,
* Therefore, FLL has the most accurate DCO to
* target frequency.
*/
regmap_update_bits(regmap, NAU8825_REG_FLL3,
NAU8825_FLL_CLK_SRC_MASK, NAU8825_FLL_CLK_SRC_BLK);
NAU8825_FLL_CLK_SRC_MASK | NAU8825_GAIN_ERR_MASK,
NAU8825_FLL_CLK_SRC_BLK |
(0xf << NAU8825_GAIN_ERR_SFT));
/* Release the semaphone. */
nau8825_sema_release(nau8825);

Expand All @@ -2194,8 +2218,16 @@ static int nau8825_configure_sysclk(struct nau8825 *nau8825, int clk_id,
* preparation halted until cross talk process finish.
*/
nau8825_sema_acquire(nau8825, 2 * HZ);
/* If FLL reference input is from low frequency source,
* higher error gain can apply such as 0xf which has
* the most sensitive gain error correction threshold,
* Therefore, FLL has the most accurate DCO to
* target frequency.
*/
regmap_update_bits(regmap, NAU8825_REG_FLL3,
NAU8825_FLL_CLK_SRC_MASK, NAU8825_FLL_CLK_SRC_FS);
NAU8825_FLL_CLK_SRC_MASK | NAU8825_GAIN_ERR_MASK,
NAU8825_FLL_CLK_SRC_FS |
(0xf << NAU8825_GAIN_ERR_SFT));
/* Release the semaphone. */
nau8825_sema_release(nau8825);

Expand Down
5 changes: 5 additions & 0 deletions sound/soc/codecs/nau8825.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -122,9 +122,13 @@
#define NAU8825_CLK_MCLK_SRC_MASK (0xf << 0)

/* FLL1 (0x04) */
#define NAU8825_ICTRL_LATCH_SFT 10
#define NAU8825_ICTRL_LATCH_MASK (0x7 << NAU8825_ICTRL_LATCH_SFT)
#define NAU8825_FLL_RATIO_MASK (0x7f << 0)

/* FLL3 (0x06) */
#define NAU8825_GAIN_ERR_SFT 12
#define NAU8825_GAIN_ERR_MASK (0xf << NAU8825_GAIN_ERR_SFT)
#define NAU8825_FLL_INTEGER_MASK (0x3ff << 0)
#define NAU8825_FLL_CLK_SRC_SFT 10
#define NAU8825_FLL_CLK_SRC_MASK (0x3 << NAU8825_FLL_CLK_SRC_SFT)
Expand All @@ -148,6 +152,7 @@
/* FLL6 (0x9) */
#define NAU8825_DCO_EN (0x1 << 15)
#define NAU8825_SDM_EN (0x1 << 14)
#define NAU8825_CUTOFF500 (0x1 << 13)

/* HSD_CTRL (0xc) */
#define NAU8825_HSD_AUTO_MODE (1 << 6)
Expand Down

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