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Diffstat (limited to 'sound/soc/codecs/rl6231.c')
-rw-r--r--sound/soc/codecs/rl6231.c131
1 files changed, 88 insertions, 43 deletions
diff --git a/sound/soc/codecs/rl6231.c b/sound/soc/codecs/rl6231.c
index 7b447d0b173a..d1fc1706422f 100644
--- a/sound/soc/codecs/rl6231.c
+++ b/sound/soc/codecs/rl6231.c
@@ -1,18 +1,16 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* rl6231.c - RL6231 class device shared support
*
* Copyright 2014 Realtek Semiconductor Corp.
*
* Author: Oder Chiou <oder_chiou@realtek.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/regmap.h>
+#include <linux/gcd.h>
#include "rl6231.h"
/**
@@ -71,7 +69,7 @@ EXPORT_SYMBOL_GPL(rl6231_get_pre_div);
*/
int rl6231_calc_dmic_clk(int rate)
{
- int div[] = {2, 3, 4, 6, 8, 12};
+ static const int div[] = {2, 3, 4, 6, 8, 12};
int i;
if (rate < 1000000 * div[0]) {
@@ -82,8 +80,8 @@ int rl6231_calc_dmic_clk(int rate)
for (i = 0; i < ARRAY_SIZE(div); i++) {
if ((div[i] % 3) == 0)
continue;
- /* find divider that gives DMIC frequency below 3.072MHz */
- if (3072000 * div[i] >= rate)
+ /* find divider that gives DMIC frequency below 1.536MHz */
+ if (1536000 * div[i] >= rate)
return i;
}
@@ -99,18 +97,41 @@ 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},
+ {19200000, 4096000, 23, 14, 1, false, false},
+ {19200000, 24576000, 3, 30, 3, false, false},
+ {48000000, 3840000, 23, 2, 0, false, false},
+ {3840000, 24576000, 3, 30, 0, true, false},
+ {3840000, 22579200, 3, 5, 0, true, false},
};
+static unsigned int find_best_div(unsigned int in,
+ unsigned int max, unsigned int div)
+{
+ unsigned int d;
+
+ if (in <= max)
+ return 1;
+
+ d = in / max;
+ if (in % max)
+ d++;
+
+ while (div % d != 0)
+ d++;
+
+
+ return d;
+}
+
/**
* 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.
*
@@ -120,10 +141,12 @@ int rl6231_pll_calc(const unsigned int freq_in,
const unsigned int freq_out, struct rl6231_pll_code *pll_code)
{
int max_n = RL6231_PLL_N_MAX, max_m = RL6231_PLL_M_MAX;
- int i, k, red, n_t, pll_out, in_t, out_t;
- int n = 0, m = 0, m_t = 0;
- int red_t = abs(freq_out - freq_in);
- bool bypass = false;
+ int i, k, n_t;
+ int k_t, min_k, max_k, n = 0, m = 0, m_t = 0;
+ 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 m_bypass = false, k_bypass = false;
if (RL6231_PLL_INP_MAX < freq_in || RL6231_PLL_INP_MIN > freq_in)
return -EINVAL;
@@ -134,52 +157,73 @@ 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;
}
}
- k = 100000000 / freq_out - 2;
- if (k > RL6231_PLL_K_MAX)
- k = RL6231_PLL_K_MAX;
- for (n_t = 0; n_t <= max_n; n_t++) {
- in_t = freq_in / (k + 2);
- pll_out = freq_out / (n_t + 2);
- if (in_t < 0)
- continue;
- if (in_t == pll_out) {
- bypass = true;
- n = n_t;
- goto code_find;
- }
- red = abs(in_t - pll_out);
- if (red < red_t) {
- bypass = true;
- n = n_t;
- m = m_t;
- if (red == 0)
+ min_k = 80000000 / freq_out - 2;
+ max_k = 150000000 / freq_out - 2;
+ if (max_k > RL6231_PLL_K_MAX)
+ max_k = RL6231_PLL_K_MAX;
+ if (min_k > RL6231_PLL_K_MAX)
+ min_k = max_k = RL6231_PLL_K_MAX;
+ div_t = gcd(freq_in, freq_out);
+ f_max = 0xffffffff / RL6231_PLL_N_MAX;
+ div = find_best_div(freq_in, f_max, div_t);
+ 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) {
+ m_bypass = true;
+ n = n_t;
+ k = k_t;
goto code_find;
- red_t = red;
- }
- for (m_t = 0; m_t <= max_m; m_t++) {
- out_t = in_t / (m_t + 2);
- red = abs(out_t - pll_out);
+ }
+ out_t = in_t / (k_t + 2);
+ red = abs(f_out - out_t);
if (red < red_t) {
- bypass = false;
+ m_bypass = true;
n = n_t;
- m = m_t;
+ m = 0;
+ k = k_t;
if (red == 0)
goto code_find;
red_t = red;
}
+ for (m_t = 0; m_t <= max_m; m_t++) {
+ out_t = in_t / ((m_t + 2) * (k_t + 2));
+ red = abs(f_out - out_t);
+ if (red < red_t) {
+ m_bypass = false;
+ n = n_t;
+ m = m_t;
+ k = k_t;
+ if (red == 0)
+ goto code_find;
+ red_t = red;
+ }
+ }
}
}
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;
@@ -189,7 +233,8 @@ EXPORT_SYMBOL_GPL(rl6231_pll_calc);
int rl6231_get_clk_info(int sclk, int rate)
{
- int i, pd[] = {1, 2, 3, 4, 6, 8, 12, 16};
+ int i;
+ static const int pd[] = {1, 2, 3, 4, 6, 8, 12, 16};
if (sclk <= 0 || rate <= 0)
return -EINVAL;
generated by cgit (git 2.34.1) at 2025-12-25 13:15:30 +0000