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ASoC: rl6231: Add the K bypass for the PLL parameters 

The patch adds the K bypass for the PLL parameters.

Signed-off-by: Oder Chiou <oder_chiou@realtek.com>
Link: https://lore.kernel.org/r/20200504074007.13002-2-oder_chiou@realtek.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Oder Chiou 2020-05-04 15:40:07 +08:00 committed by Mark Brown
parent e149ca29f3
commit c25504ad64
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
2 changed files with 20 additions and 10 deletions
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29
sound/soc/codecs/rl6231.c
View File

@ -97,12 +97,13 @@ struct pll_calc_map {
int n;
int m;
bool m_bp;
bool k_bp;
};
static const struct pll_calc_map pll_preset_table[] = {
{19200000, 4096000, 23, 14, 1, false},
{19200000, 24576000, 3, 30, 3, false},
{3840000, 24576000, 3, 30, 0, true},
{19200000, 4096000, 23, 14, 1, false, false},
{19200000, 24576000, 3, 30, 3, false, false},
{3840000, 24576000, 3, 30, 0, true, false},
};
static unsigned int find_best_div(unsigned int in,
@ -128,7 +129,7 @@ static unsigned int find_best_div(unsigned int in,
* rl6231_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.
* @pll_code: Pointer to structure with M, N, K, m_bypass and k_bypass flag.
*
* Calcualte M/N/K code to configure PLL for codec.
*
@ -143,7 +144,7 @@ int rl6231_pll_calc(const unsigned int freq_in,
unsigned int red, pll_out, in_t, out_t, div, div_t;
unsigned int red_t = abs(freq_out - freq_in);
unsigned int f_in, f_out, f_max;
bool bypass = false;
bool m_bypass = false, k_bypass = false;
if (RL6231_PLL_INP_MAX < freq_in || RL6231_PLL_INP_MIN > freq_in)
return -EINVAL;
@ -154,7 +155,8 @@ int rl6231_pll_calc(const unsigned int freq_in,
k = pll_preset_table[i].k;
m = pll_preset_table[i].m;
n = pll_preset_table[i].n;
bypass = pll_preset_table[i].m_bp;
m_bypass = pll_preset_table[i].m_bp;
k_bypass = pll_preset_table[i].k_bp;
pr_debug("Use preset PLL parameter table\n");
goto code_find;
}
@ -172,12 +174,14 @@ int rl6231_pll_calc(const unsigned int freq_in,
f_in = freq_in / div;
f_out = freq_out / div;
k = min_k;
if (min_k < -1)
min_k = -1;
for (k_t = min_k; k_t <= max_k; k_t++) {
for (n_t = 0; n_t <= max_n; n_t++) {
in_t = f_in * (n_t + 2);
pll_out = f_out * (k_t + 2);
if (in_t == pll_out) {
bypass = true;
m_bypass = true;
n = n_t;
k = k_t;
goto code_find;
@ -185,7 +189,7 @@ int rl6231_pll_calc(const unsigned int freq_in,
out_t = in_t / (k_t + 2);
red = abs(f_out - out_t);
if (red < red_t) {
bypass = true;
m_bypass = true;
n = n_t;
m = 0;
k = k_t;
@ -197,7 +201,7 @@ int rl6231_pll_calc(const unsigned int freq_in,
out_t = in_t / ((m_t + 2) * (k_t + 2));
red = abs(f_out - out_t);
if (red < red_t) {
bypass = false;
m_bypass = false;
n = n_t;
m = m_t;
k = k_t;
@ -211,8 +215,13 @@ int rl6231_pll_calc(const unsigned int freq_in,
pr_debug("Only get approximation about PLL\n");
code_find:
if (k == -1) {
k_bypass = true;
k = 0;
}
pll_code->m_bp = bypass;
pll_code->m_bp = m_bypass;
pll_code->k_bp = k_bypass;
pll_code->m_code = m;
pll_code->n_code = n;
pll_code->k_code = k;

1
sound/soc/codecs/rl6231.h
View File

@ -18,6 +18,7 @@
struct rl6231_pll_code {
bool m_bp; /* Indicates bypass m code or not. */
bool k_bp; /* Indicates bypass k code or not. */
int m_code;
int n_code;
int k_code;