On 9/4/19 2:13 AM, Vinod Koul wrote:
On 13-08-19, 16:32, Pierre-Louis Bossart wrote:
Provide debugfs capability to kick link and devices into hard-reset (as defined by MIPI). This capability is really useful when some devices are no longer responsive and/or to check the software handling of resynchronization.
Signed-off-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com
drivers/soundwire/cadence_master.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+)
diff --git a/drivers/soundwire/cadence_master.c b/drivers/soundwire/cadence_master.c index 046622e4b264..bd58d80ff636 100644 --- a/drivers/soundwire/cadence_master.c +++ b/drivers/soundwire/cadence_master.c @@ -340,6 +340,23 @@ static int cdns_reg_show(struct seq_file *s, void *data) } DEFINE_SHOW_ATTRIBUTE(cdns_reg);
+static int cdns_hw_reset(void *data, u64 value) +{
- struct sdw_cdns *cdns = data;
- int ret;
- if (value != 1)
return 0;Should this not be EINVAL to indicate invalid value passed?
Maybe. I must admit I don't know what -EINVAL would do, this is used for debugfs so it's not clear to me if the user will see a difference?
- ret = sdw_cdns_exit_reset(cdns);
- dev_dbg(cdns->dev, "link hw_reset done: %d\n", ret);
- return ret;
+}
+DEFINE_DEBUGFS_ATTRIBUTE(cdns_hw_reset_fops, NULL, cdns_hw_reset, "%llu\n");
- /**
- sdw_cdns_debugfs_init() - Cadence debugfs init
- @cdns: Cadence instance
@@ -348,6 +365,9 @@ DEFINE_SHOW_ATTRIBUTE(cdns_reg); void sdw_cdns_debugfs_init(struct sdw_cdns *cdns, struct dentry *root) { debugfs_create_file("cdns-registers", 0400, root, cdns, &cdns_reg_fops);
- debugfs_create_file("cdns-hw-reset", 0200, root, cdns,
&cdns_hw_reset_fops);-- 2.20.1