ASoC: Intel: sof_rt5682: use RT5682S_PLL1 if needed

When 96KHz sample rate is used, and MCLK is 24.576MHz, we will need
pll_in = 24576000 and pll_out = 49152000 which is not supported by
RT5682S_PLL2. Use RT5682S_PLL1 in this case.
We don't test sample rate because RT5682S_PLL2 doesn't support 24.576MHz
input and in the MCLK = 24.576MHz, sample rate = 48KHz case, i.e.
pll_in == pll_out, PLL will not be used at all.

Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20240411220347.131267-13-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/intel/boards/sof_rt5682.c b/sound/soc/intel/boards/sof_rt5682.c
index 735e07ea62bdbb1e5a0f760ff7138ed87cb5b933..062012de3de22b32a41d5c8d09f8e988447287d2 100644 (file)
--- a/sound/soc/intel/boards/sof_rt5682.c
+++ b/sound/soc/intel/boards/sof_rt5682.c
@@ -340,8 +340,19 @@ static int sof_rt5682_hw_params(struct snd_pcm_substream *substream,
                clk_id = RT5682_SCLK_S_PLL1;
                break;
        case CODEC_RT5682S:
-               pll_id = RT5682S_PLL2;
-               clk_id = RT5682S_SCLK_S_PLL2;
+               /*
+                * For MCLK = 24.576MHz and sample rate = 96KHz case, use PLL1  We don't test
+                * pll_out or params_rate() here since rt5682s PLL2 doesn't support 24.576MHz
+                * input, so we have no choice but to use PLL1. Besides, we will not use PLL at
+                * all if pll_in == pll_out. ex, MCLK = 24.576Mhz and sample rate = 48KHz
+                */
+               if (pll_in == 24576000) {
+                       pll_id = RT5682S_PLL1;
+                       clk_id = RT5682S_SCLK_S_PLL1;
+               } else {
+                       pll_id = RT5682S_PLL2;
+                       clk_id = RT5682S_SCLK_S_PLL2;
+               }
                break;
        default:
                dev_err(rtd->dev, "invalid codec type %d\n", ctx->codec_type);