ASoC: mediatek: mt8195: update audio tuner settings

Audio tuner is used to handle clock drift between 26M and APLL domain.

It's expected when abs(chg_cnt) equals to upper bound, tuner updates pcw
setting automatically, and then abs(chg_cnt) decreases.
In the stress test, we found abs(chg_cnt) possibly equals to 2 at the
unexpected timing. This results in wrong pcw updating.
Finally, abs(chg_cnt) will always be larger than upper bound,

As a result, we update the upper bound to 3 to handle the corner case.

Signed-off-by: Trevor Wu <trevor.wu@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20220927151141.11846-1-trevor.wu@mediatek.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/mediatek/mt8195/mt8195-afe-clk.c b/sound/soc/mediatek/mt8195/mt8195-afe-clk.c
index 2ee3872..9ca2cb8 100644 (file)
--- a/sound/soc/mediatek/mt8195/mt8195-afe-clk.c
+++ b/sound/soc/mediatek/mt8195/mt8195-afe-clk.c
@@ -117,7 +117,7 @@ static struct mt8195_afe_tuner_cfg mt8195_afe_tuner_cfgs[MT8195_AUD_PLL_NUM] = {
                .upper_bound_reg = AFE_APLL_TUNER_CFG,
                .upper_bound_shift = 8,
                .upper_bound_maskbit = 0xff,
-               .upper_bound_default = 0x2,
+               .upper_bound_default = 0x3,
        },
        [MT8195_AUD_PLL2] = {
                .id = MT8195_AUD_PLL2,
@@ -135,7 +135,7 @@ static struct mt8195_afe_tuner_cfg mt8195_afe_tuner_cfgs[MT8195_AUD_PLL_NUM] = {
                .upper_bound_reg = AFE_APLL_TUNER_CFG1,
                .upper_bound_shift = 8,
                .upper_bound_maskbit = 0xff,
-               .upper_bound_default = 0x2,
+               .upper_bound_default = 0x3,
        },
        [MT8195_AUD_PLL3] = {
                .id = MT8195_AUD_PLL3,