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 <[email protected]>
---
sound/soc/mediatek/mt8195/mt8195-afe-clk.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/sound/soc/mediatek/mt8195/mt8195-afe-clk.c b/sound/soc/mediatek/mt8195/mt8195-afe-clk.c
index 2ee3872c83c3..9ca2cb8c8a9c 100644
--- 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,
--
2.18.0
Il 27/09/22 17:11, Trevor Wu ha scritto:
> 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 <[email protected]>
Reviewed-by: AngeloGioacchino Del Regno <[email protected]>
On Tue, 27 Sep 2022 23:11:41 +0800, Trevor Wu wrote:
> 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,
>
> [...]
Applied to
https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next
Thanks!
[1/1] ASoC: mediatek: mt8195: update audio tuner settings
commit: 7ba6546b547c75b0196029c7e0aaaab2eb6694a4
All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.
You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.
If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.
Please add any relevant lists and maintainers to the CCs when replying
to this mail.
Thanks,
Mark