linux-kernel - Re: [PATCH 1/2] soundwire: add definition for maximum number of ports

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Message-ID: <20200818063538.GV2639@vkoul-mobl>
Date:   Tue, 18 Aug 2020 12:05:38 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Bard Liao <yung-chuan.liao@...ux.intel.com>
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        tiwai@...e.de, broonie@...nel.org, gregkh@...uxfoundation.org,
        jank@...ence.com, srinivas.kandagatla@...aro.org,
        rander.wang@...ux.intel.com, ranjani.sridharan@...ux.intel.com,
        hui.wang@...onical.com, pierre-louis.bossart@...ux.intel.com,
        sanyog.r.kale@...el.com, mengdong.lin@...el.com,
        bard.liao@...el.com
Subject: Re: [PATCH 1/2] soundwire: add definition for maximum number of ports

On 18-08-20, 01:47, Bard Liao wrote:
> From: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
> 
> A Device may have at most 15 physical ports (DP0, DP1..DP14).
> 
> Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
> Reviewed-by: Rander Wang <rander.wang@...ux.intel.com>
> Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@...ux.intel.com>
> Signed-off-by: Bard Liao <yung-chuan.liao@...ux.intel.com>
> ---
>  include/linux/soundwire/sdw.h | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/include/linux/soundwire/sdw.h b/include/linux/soundwire/sdw.h
> index 76052f12c9f7..0aa4c6af7554 100644
> --- a/include/linux/soundwire/sdw.h
> +++ b/include/linux/soundwire/sdw.h
> @@ -38,7 +38,8 @@ struct sdw_slave;
>  #define SDW_FRAME_CTRL_BITS		48
>  #define SDW_MAX_DEVICES			11
>  
> -#define SDW_VALID_PORT_RANGE(n)		((n) <= 14 && (n) >= 1)
> +#define SDW_MAX_PORTS			15
> +#define SDW_VALID_PORT_RANGE(n)		((n) < SDW_MAX_PORTS && (n) >= 1)

What is the use of this one if we are allocating all ports always, Also,
I dont see it used in second patch?

>  
>  enum {
>  	SDW_PORT_DIRN_SINK = 0,
> -- 
> 2.17.1

-- 
~Vinod