xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

ASoC: rt5640: Add the function of the PLL clock calculation to RL6231 shared support

Browse Source 
The patch adds the function of the PLL clock calculation to RL6231 shared
support.

Signed-off-by: Oder Chiou <oder_chiou@realtek.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Oder Chiou
2014-05-20 15:01:54 +08:00
committed by Mark Brown
parent 49ef7925c2
commit 71c7a2d675
8 changed files with 102 additions and 206 deletions
Download Patch File Download Diff File Expand all files Collapse all files

68
sound/soc/codecs/rt5651.c
View File

@@ -1516,65 +1516,12 @@ static int rt5651_set_dai_sysclk(struct snd_soc_dai *dai,
return 0;
}
/**
* rt5651_pll_calc - Calcualte PLL M/N/K code.
* @freq_in: external clock provided to codec.
* @freq_out: target clock which codec works on.
* @pll_code: Pointer to structure with M, N, K and bypass flag.
*
* Calcualte M/N/K code to configure PLL for codec. And K is assigned to 2
* which make calculation more efficiently.
*
* Returns 0 for success or negative error code.
*/
static int rt5651_pll_calc(const unsigned int freq_in,
const unsigned int freq_out, struct rt5651_pll_code *pll_code)
{
int max_n = RT5651_PLL_N_MAX, max_m = RT5651_PLL_M_MAX;
int n = 0, m = 0, red, n_t, m_t, in_t, out_t;
int red_t = abs(freq_out - freq_in);
bool bypass = false;
if (RT5651_PLL_INP_MAX < freq_in || RT5651_PLL_INP_MIN > freq_in)
return -EINVAL;
for (n_t = 0; n_t <= max_n; n_t++) {
in_t = (freq_in >> 1) + (freq_in >> 2) * n_t;
if (in_t < 0)
continue;
if (in_t == freq_out) {
bypass = true;
n = n_t;
goto code_find;
}
for (m_t = 0; m_t <= max_m; m_t++) {
out_t = in_t / (m_t + 2);
red = abs(out_t - freq_out);
if (red < red_t) {
n = n_t;
m = m_t;
if (red == 0)
goto code_find;
red_t = red;
}
}
}
pr_debug("Only get approximation about PLL\n");
code_find:
pll_code->m_bp = bypass;
pll_code->m_code = m;
pll_code->n_code = n;
pll_code->k_code = 2;
return 0;
}
static int rt5651_set_dai_pll(struct snd_soc_dai *dai, int pll_id, int source,
unsigned int freq_in, unsigned int freq_out)
{
struct snd_soc_codec *codec = dai->codec;
struct rt5651_priv *rt5651 = snd_soc_codec_get_drvdata(codec);
struct rt5651_pll_code *pll_code = &rt5651->pll_code;
struct rl6231_pll_code pll_code;
int ret;
if (source == rt5651->pll_src && freq_in == rt5651->pll_in &&
@@ -1609,20 +1556,21 @@ static int rt5651_set_dai_pll(struct snd_soc_dai *dai, int pll_id, int source,
return -EINVAL;
}
ret = rt5651_pll_calc(freq_in, freq_out, pll_code);
ret = rl6231_pll_calc(freq_in, freq_out, &pll_code);
if (ret < 0) {
dev_err(codec->dev, "Unsupport input clock %d\n", freq_in);
return ret;
}
dev_dbg(codec->dev, "bypass=%d m=%d n=%d k=2\n", pll_code->m_bp,
(pll_code->m_bp ? 0 : pll_code->m_code), pll_code->n_code);
dev_dbg(codec->dev, "bypass=%d m=%d n=%d k=%d\n",
pll_code.m_bp, (pll_code.m_bp ? 0 : pll_code.m_code),
pll_code.n_code, pll_code.k_code);
snd_soc_write(codec, RT5651_PLL_CTRL1,
pll_code->n_code << RT5651_PLL_N_SFT | pll_code->k_code);
pll_code.n_code << RT5651_PLL_N_SFT | pll_code.k_code);
snd_soc_write(codec, RT5651_PLL_CTRL2,
(pll_code->m_bp ? 0 : pll_code->m_code) << RT5651_PLL_M_SFT |
pll_code->m_bp << RT5651_PLL_M_BP_SFT);
(pll_code.m_bp ? 0 : pll_code.m_code) << RT5651_PLL_M_SFT |
pll_code.m_bp << RT5651_PLL_M_BP_SFT);
rt5651->pll_in = freq_in;
rt5651->pll_out = freq_out;