[PATCH 2/6] soundwire: cadence_master: add hw_reset capability in debugfs

From: Pierre-Louis Bossart
Date: Tue Aug 13 2019 - 17:33:17 EST


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@xxxxxxxxxxxxxxx>
---
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;
+
+ 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);
}
EXPORT_SYMBOL_GPL(sdw_cdns_debugfs_init);

--
2.20.1