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ASoC: wm8994: Support EFS mode for FLL

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Later WM8994 devices support an enhanced accuracy FLL divisor mode called
EFS which allows more precise selection of fractional source to output
ratios. Support this on relevant devices.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Mark Brown 2013-05-10 21:40:10 +01:00
parent f722406faa
commit d1a0a29958
1 changed files with 36 additions and 13 deletions
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49
sound/soc/codecs/wm8994.c
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@ -16,6 +16,7 @@
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/gcd.h>
#include <linux/i2c.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
@ -2005,15 +2006,16 @@ struct fll_div {
u16 outdiv;
u16 n;
u16 k;
u16 lambda;
u16 clk_ref_div;
u16 fll_fratio;
};
static int wm8994_get_fll_config(struct fll_div *fll,
static int wm8994_get_fll_config(struct wm8994 *control, struct fll_div *fll,
int freq_in, int freq_out)
{
u64 Kpart;
unsigned int K, Ndiv, Nmod;
unsigned int K, Ndiv, Nmod, gcd_fll;
pr_debug("FLL input=%dHz, output=%dHz\n", freq_in, freq_out);
@ -2062,20 +2064,30 @@ static int wm8994_get_fll_config(struct fll_div *fll,
Nmod = freq_out % freq_in;
pr_debug("Nmod=%d\n", Nmod);
/* Calculate fractional part - scale up so we can round. */
Kpart = FIXED_FLL_SIZE * (long long)Nmod;
switch (control->type) {
case WM8994:
/* Calculate fractional part - scale up so we can round. */
Kpart = FIXED_FLL_SIZE * (long long)Nmod;
do_div(Kpart, freq_in);
do_div(Kpart, freq_in);
K = Kpart & 0xFFFFFFFF;
K = Kpart & 0xFFFFFFFF;
if ((K % 10) >= 5)
K += 5;
if ((K % 10) >= 5)
K += 5;
/* Move down to proper range now rounding is done */
fll->k = K / 10;
/* Move down to proper range now rounding is done */
fll->k = K / 10;
pr_debug("N=%x K=%x\n", fll->n, fll->k);
pr_debug("N=%x K=%x\n", fll->n, fll->k);
default:
gcd_fll = gcd(freq_out, freq_in);
fll->k = (freq_out - (freq_in * fll->n)) / gcd_fll;
fll->lambda = freq_in / gcd_fll;
}
return 0;
}
@ -2139,9 +2151,9 @@ static int _wm8994_set_fll(struct snd_soc_codec *codec, int id, int src,
* analysis bugs spewing warnings.
*/
if (freq_out)
ret = wm8994_get_fll_config(&fll, freq_in, freq_out);
ret = wm8994_get_fll_config(control, &fll, freq_in, freq_out);
else
ret = wm8994_get_fll_config(&fll, wm8994->fll[id].in,
ret = wm8994_get_fll_config(control, &fll, wm8994->fll[id].in,
wm8994->fll[id].out);
if (ret < 0)
return ret;
@ -2186,6 +2198,17 @@ static int _wm8994_set_fll(struct snd_soc_codec *codec, int id, int src,
WM8994_FLL1_N_MASK,
fll.n << WM8994_FLL1_N_SHIFT);
if (fll.lambda) {
snd_soc_update_bits(codec, WM8958_FLL1_EFS_1 + reg_offset,
WM8958_FLL1_LAMBDA_MASK,
fll.lambda);
snd_soc_update_bits(codec, WM8958_FLL1_EFS_2 + reg_offset,
WM8958_FLL1_EFS_ENA, WM8958_FLL1_EFS_ENA);
} else {
snd_soc_update_bits(codec, WM8958_FLL1_EFS_2 + reg_offset,
WM8958_FLL1_EFS_ENA, 0);
}
snd_soc_update_bits(codec, WM8994_FLL1_CONTROL_5 + reg_offset,
WM8994_FLL1_FRC_NCO | WM8958_FLL1_BYP |
WM8994_FLL1_REFCLK_DIV_MASK |