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SubjectRe: [alsa-devel] [RFC PATCH 15/40] soundwire: cadence_master: handle multiple status reports per Slave
On Thu, Jul 25, 2019 at 06:40:07PM -0500, Pierre-Louis Bossart wrote:
> When a Slave reports multiple status in the sticky bits, find the
> latest configuration from the mirror of the PING frame status and
> update the status directly.
>
> Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
> ---
> drivers/soundwire/cadence_master.c | 34 ++++++++++++++++++++++++------
> 1 file changed, 28 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/soundwire/cadence_master.c b/drivers/soundwire/cadence_master.c
> index 889fa2cd49ae..25d5c7267c15 100644
> --- a/drivers/soundwire/cadence_master.c
> +++ b/drivers/soundwire/cadence_master.c
> @@ -643,13 +643,35 @@ static int cdns_update_slave_status(struct sdw_cdns *cdns,
>
> /* first check if Slave reported multiple status */
> if (set_status > 1) {
> + u32 val;
> +
> dev_warn_ratelimited(cdns->dev,
> - "Slave reported multiple Status: %d\n",
> - mask);
> - /*
> - * TODO: we need to reread the status here by
> - * issuing a PING cmd
> - */
> + "Slave %d reported multiple Status: %d\n",
> + i, mask);
> +
> + /* re-check latest status extracted from PING commands */
> + val = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT);
> + val >>= (i * 2);

Superfluous parentheses.

> +
> + switch (val & 0x3) {
> + case 0:
> + status[i] = SDW_SLAVE_UNATTACHED;
> + break;
> + case 1:
> + status[i] = SDW_SLAVE_ATTACHED;
> + break;
> + case 2:
> + status[i] = SDW_SLAVE_ALERT;
> + break;
> + default:

There aren't many values left for the "default" case :-) But I'm not sure whether
any of

+ case 3:

or

+ case 3:
+ default:

would improve readability.

Thanks
Guennadi

> + status[i] = SDW_SLAVE_RESERVED;
> + break;
> + }
> +
> + dev_warn_ratelimited(cdns->dev,
> + "Slave %d status updated to %d\n",
> + i, status[i]);
> +
> }
> }
>
> --
> 2.20.1
>
> _______________________________________________
> Alsa-devel mailing list
> Alsa-devel@alsa-project.org
> https://mailman.alsa-project.org/mailman/listinfo/alsa-devel

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