linux-kernel - Re: [PATCH] soundwire: cadence: Write to correct address for each FIFO chunk

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Message-ID: <5b9040e8-fe19-2438-0072-74b2f0d914e3@linux.intel.com>
Date:   Mon, 19 Sep 2022 10:39:32 +0200
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Richard Fitzgerald <rf@...nsource.cirrus.com>, vkoul@...nel.org,
        yung-chuan.liao@...ux.intel.com, sanyog.r.kale@...el.com
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        patches@...nsource.cirrus.com
Subject: Re: [PATCH] soundwire: cadence: Write to correct address for each
 FIFO chunk



On 9/17/22 14:35, Richard Fitzgerald wrote:
> _cdns_xfer_msg() must add the fragment offset to msg->addr to get the
> base target address of each FIFO chunk. Otherwise every chunk will
> be written to the first 32 register addresses.
> 
> Signed-off-by: Richard Fitzgerald <rf@...nsource.cirrus.com>
> ---
>  drivers/soundwire/cadence_master.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/soundwire/cadence_master.c b/drivers/soundwire/cadence_master.c
> index 3ef472049980..ca241bbeadd9 100644
> --- a/drivers/soundwire/cadence_master.c
> +++ b/drivers/soundwire/cadence_master.c
> @@ -569,7 +569,7 @@ _cdns_xfer_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int cmd,
>  	}
>  
>  	base = CDNS_MCP_CMD_BASE;
> -	addr = msg->addr;
> +	addr = msg->addr + offset;

LGTM, probably means that sending a large command broken in several
pieces never worked. D'oh.

Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>

Thanks Richard!

>  
>  	for (i = 0; i < count; i++) {
>  		data = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num);