linux-kernel - Re: [PATCH 19/19] ASoC: amd: ps: increase runtime suspend delay

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Message-ID: <c7f018e3-c8be-6819-0ece-244bfb943c62@linux.intel.com>
Date:   Wed, 11 Jan 2023 10:02:52 -0600
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Vijendar Mukunda <Vijendar.Mukunda@....com>, broonie@...nel.org,
        vkoul@...nel.org, alsa-devel@...a-project.org
Cc:     Mastan.Katragadda@....com, Sunil-kumar.Dommati@....com,
        open list <linux-kernel@...r.kernel.org>,
        Basavaraj.Hiregoudar@....com, Takashi Iwai <tiwai@...e.com>,
        Liam Girdwood <lgirdwood@...il.com>, Mario.Limonciello@....com,
        arungopal.kondaveeti@....com,
        Syed Saba Kareem <Syed.SabaKareem@....com>
Subject: Re: [PATCH 19/19] ASoC: amd: ps: increase runtime suspend delay



On 1/11/23 03:02, Vijendar Mukunda wrote:
> To avoid ACP entering into D3 state during slave enumeration and
> initialization on two soundwire controller instances for multiple codecs,
> increase the runtime suspend delay to 3 seconds.

You have a parent PCI device and a set of child devices for each
manager. The parent PCI device cannot suspend before all its children
are also suspended, so shouldn't the delay be modified at the manager level?

Not getting what this delay is and how this would deal with a lengthy
enumeration/initialization process.

> 
> Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda@....com>
> ---
>  sound/soc/amd/ps/acp63.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/sound/soc/amd/ps/acp63.h b/sound/soc/amd/ps/acp63.h
> index 833d0b5aa73d..6c8849f2bcec 100644
> --- a/sound/soc/amd/ps/acp63.h
> +++ b/sound/soc/amd/ps/acp63.h
> @@ -51,7 +51,7 @@
>  #define MIN_BUFFER MAX_BUFFER
>  
>  /* time in ms for runtime suspend delay */
> -#define ACP_SUSPEND_DELAY_MS	2000
> +#define ACP_SUSPEND_DELAY_MS	3000
>  
>  #define ACP63_DMIC_ADDR		2
>  #define ACP63_PDM_MODE_DEVS		3