linux-kernel - Re: [PATCH] soundwire: qcom: adjust autoenumeration timeout

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Message-ID: <e9f4001d-a9f4-fae7-521a-76f8880ba82b@linux.intel.com>
Date:   Fri, 29 Apr 2022 11:19:40 -0500
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        vkoul@...nel.org
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        bard.liao@...el.com,
        Srinivasa Rao Mandadapu <quic_srivasam@...cinc.com>
Subject: Re: [PATCH] soundwire: qcom: adjust autoenumeration timeout



On 4/29/22 11:09, Srinivas Kandagatla wrote:
> Currently timeout for autoenumeration during probe and bus reset is set to
> 2 secs which is really a big value. This can have an adverse effect on
> boot time if the slave device is not ready/reset.
> This was the case with wcd938x which was not reset yet but we spent 2
> secs waiting in the soundwire controller probe. Reduce this time to
> 1/10 of Hz which should be good enough time to finish autoenumeration
> if any slaves are available on the bus.

Can I ask why this is dependent on a software configuration you have no control on?

Why not simply:

#define TIMEOUT_MS		100

?

> 
> Reported-by: Srinivasa Rao Mandadapu <quic_srivasam@...cinc.com>
> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> ---
>  drivers/soundwire/qcom.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/soundwire/qcom.c b/drivers/soundwire/qcom.c
> index da1ad7ebb1aa..432e5cb9a4d2 100644
> --- a/drivers/soundwire/qcom.c
> +++ b/drivers/soundwire/qcom.c
> @@ -105,7 +105,7 @@
>  
>  #define SWRM_SPECIAL_CMD_ID	0xF
>  #define MAX_FREQ_NUM		1
> -#define TIMEOUT_MS		(2 * HZ)
> +#define TIMEOUT_MS		(HZ/10)
>  #define QCOM_SWRM_MAX_RD_LEN	0x1
>  #define QCOM_SDW_MAX_PORTS	14
>  #define DEFAULT_CLK_FREQ	9600000