linux-kernel - Re: [RESEND PATCH] ASoC: codecs: lpass: fix the order or clks turn off during suspend

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Date:   Thu, 23 Mar 2023 19:26:49 +0530
From:   Amit Pundir <amit.pundir@...aro.org>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     broonie@...nel.org, perex@...ex.cz, tiwai@...e.com,
        lgirdwood@...il.com, linux-kernel@...r.kernel.org,
        alsa-devel@...a-project.org, stable <stable@...r.kernel.org>
Subject: Re: [RESEND PATCH] ASoC: codecs: lpass: fix the order or clks turn
 off during suspend

On Thu, 23 Mar 2023 at 16:31, Srinivas Kandagatla
<srinivas.kandagatla@...aro.org> wrote:
>
> The order in which clocks are stopped matters as some of the clock
> like NPL are derived from MCLK.
>
> Without this patch, Dragonboard RB5 DSP would crash with below error:
>  qcom_q6v5_pas 17300000.remoteproc: fatal error received:
>  ABT_dal.c:278:ABTimeout: AHB Bus hang is detected,
>  Number of bus hang detected := 2 , addr0 = 0x3370000 , addr1 = 0x0!!!
>
> Turn off  fsgen first, followed by npl and then finally mclk, which is exactly
> the opposite order of enable sequence.
>

Tested-by: Amit Pundir <amit.pundir@...aro.org>
CC: stable@...r.kernel.org # v6.1.y


> Fixes: 1dc3459009c3 ("ASoC: codecs: lpass: register mclk after runtime pm")
> Reported-by: Amit Pundir <amit.pundir@...aro.org>
> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> ---
>
> Sorry for noise, resending this one, as I missed the asoc mailing list in my previous send.
>
>
>  sound/soc/codecs/lpass-rx-macro.c  | 4 ++--
>  sound/soc/codecs/lpass-tx-macro.c  | 4 ++--
>  sound/soc/codecs/lpass-wsa-macro.c | 4 ++--
>  3 files changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/sound/soc/codecs/lpass-rx-macro.c b/sound/soc/codecs/lpass-rx-macro.c
> index 9e0a4e8a46c3..372bea8b3525 100644
> --- a/sound/soc/codecs/lpass-rx-macro.c
> +++ b/sound/soc/codecs/lpass-rx-macro.c
> @@ -3668,9 +3668,9 @@ static int __maybe_unused rx_macro_runtime_suspend(struct device *dev)
>         regcache_cache_only(rx->regmap, true);
>         regcache_mark_dirty(rx->regmap);
>
> -       clk_disable_unprepare(rx->mclk);
> -       clk_disable_unprepare(rx->npl);
>         clk_disable_unprepare(rx->fsgen);
> +       clk_disable_unprepare(rx->npl);
> +       clk_disable_unprepare(rx->mclk);
>
>         return 0;
>  }
> diff --git a/sound/soc/codecs/lpass-tx-macro.c b/sound/soc/codecs/lpass-tx-macro.c
> index b044c9c6f89b..d9318799f6b7 100644
> --- a/sound/soc/codecs/lpass-tx-macro.c
> +++ b/sound/soc/codecs/lpass-tx-macro.c
> @@ -2096,9 +2096,9 @@ static int __maybe_unused tx_macro_runtime_suspend(struct device *dev)
>         regcache_cache_only(tx->regmap, true);
>         regcache_mark_dirty(tx->regmap);
>
> -       clk_disable_unprepare(tx->mclk);
> -       clk_disable_unprepare(tx->npl);
>         clk_disable_unprepare(tx->fsgen);
> +       clk_disable_unprepare(tx->npl);
> +       clk_disable_unprepare(tx->mclk);
>
>         return 0;
>  }
> diff --git a/sound/soc/codecs/lpass-wsa-macro.c b/sound/soc/codecs/lpass-wsa-macro.c
> index 728f26d12ab0..6484c335bd5d 100644
> --- a/sound/soc/codecs/lpass-wsa-macro.c
> +++ b/sound/soc/codecs/lpass-wsa-macro.c
> @@ -2504,9 +2504,9 @@ static int __maybe_unused wsa_macro_runtime_suspend(struct device *dev)
>         regcache_cache_only(wsa->regmap, true);
>         regcache_mark_dirty(wsa->regmap);
>
> -       clk_disable_unprepare(wsa->mclk);
> -       clk_disable_unprepare(wsa->npl);
>         clk_disable_unprepare(wsa->fsgen);
> +       clk_disable_unprepare(wsa->npl);
> +       clk_disable_unprepare(wsa->mclk);
>
>         return 0;
>  }
> --
> 2.21.0
>