Currently, rl6231_pll_calc provide a working PLL parameters for given freq_in and freq_out. However, in some cases it is not the perfect parameter. For example if freq_in = 19200000 and freq_out = 24576000, the calculated parameter will gengrate 24.5647 MHz which is not exactly the same as what we need. But the PLL can output 24.576 MHz as exactly what we expect if we set the best PLL parameter. To improve it, we put the best match parameters in a preset table. We can search the preset table first, if there is no preset parameter for the given freq_in and freq_out, we can still calculate a working PLL parameter.
Signed-off-by: Bard Liao bardliao@realtek.com --- sound/soc/codecs/rl6231.c | 27 ++++++++++++++++++++++++++- 1 file changed, 26 insertions(+), 1 deletion(-)
diff --git a/sound/soc/codecs/rl6231.c b/sound/soc/codecs/rl6231.c index 56650d6..96f3e90 100644 --- a/sound/soc/codecs/rl6231.c +++ b/sound/soc/codecs/rl6231.c @@ -43,6 +43,19 @@ int rl6231_calc_dmic_clk(int rate) } EXPORT_SYMBOL_GPL(rl6231_calc_dmic_clk);
+struct pll_calc_map { + unsigned int pll_in; + unsigned int pll_out; + int k; + int n; + int m; + bool m_bp; +}; + +static const struct pll_calc_map pll_preset_table[] = { + {19200000, 24576000, 3, 30, 3, false}, +}; + /** * rl6231_pll_calc - Calcualte PLL M/N/K code. * @freq_in: external clock provided to codec. @@ -57,7 +70,7 @@ 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 k, red, n_t, pll_out, in_t, out_t; + 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; @@ -65,6 +78,18 @@ int rl6231_pll_calc(const unsigned int freq_in, if (RL6231_PLL_INP_MAX < freq_in || RL6231_PLL_INP_MIN > freq_in) return -EINVAL;
+ for (i = 0; i < ARRAY_SIZE(pll_preset_table); i++) { + if (freq_in == pll_preset_table[i].pll_in && + freq_out == pll_preset_table[i].pll_out) { + 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; + 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;