linux-kernel - [PATCH 2/3] drm/bridge: ti-sn65dsi86: add debugfs

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Date:   Tue,  2 Jul 2019 08:44:17 -0700
From:   Rob Clark <robdclark@...il.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     linux-arm-msm@...r.kernel.org, Sean Paul <seanpaul@...omium.org>,
        Rob Clark <robdclark@...omium.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] drm/bridge: ti-sn65dsi86: add debugfs

From: Rob Clark <robdclark@...omium.org>

Add a debugfs file to show status registers.

Signed-off-by: Rob Clark <robdclark@...omium.org>
---
 drivers/gpu/drm/bridge/ti-sn65dsi86.c | 42 +++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
index f1a2493b86d9..a6f27648c015 100644
--- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
+++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
@@ -5,6 +5,7 @@
  */
 
 #include <linux/clk.h>
+#include <linux/debugfs.h>
 #include <linux/gpio/consumer.h>
 #include <linux/i2c.h>
 #include <linux/iopoll.h>
@@ -109,6 +110,7 @@ struct ti_sn_bridge {
 	struct drm_dp_aux		aux;
 	struct drm_bridge		bridge;
 	struct drm_connector		connector;
+	struct dentry			*debugfs;
 	struct device_node		*host_node;
 	struct mipi_dsi_device		*dsi;
 	struct clk			*refclk;
@@ -178,6 +180,42 @@ static const struct dev_pm_ops ti_sn_bridge_pm_ops = {
 	SET_RUNTIME_PM_OPS(ti_sn_bridge_suspend, ti_sn_bridge_resume, NULL)
 };
 
+static int status_show(struct seq_file *s, void *data)
+{
+	struct ti_sn_bridge *pdata = s->private;
+	unsigned int reg, val;
+
+	seq_puts(s, "STATUS REGISTERS:\n");
+
+	pm_runtime_get_sync(pdata->dev);
+
+	/* IRQ Status Registers, see Table 31 in datasheet */
+	for (reg = 0xf0; reg <= 0xf8; reg++) {
+		regmap_read(pdata->regmap, reg, &val);
+		seq_printf(s, "[0x%02x] = 0x%08x\n", reg, val);
+	}
+
+	pm_runtime_put(pdata->dev);
+
+	return 0;
+}
+
+DEFINE_SHOW_ATTRIBUTE(status);
+
+static void ti_sn_debugfs_init(struct ti_sn_bridge *pdata)
+{
+	pdata->debugfs = debugfs_create_dir("ti_sn65dsi86", NULL);
+
+	debugfs_create_file("status", 0600, pdata->debugfs, pdata,
+			&status_fops);
+}
+
+static void ti_sn_debugfs_remove(struct ti_sn_bridge *pdata)
+{
+	debugfs_remove_recursive(pdata->debugfs);
+	pdata->debugfs = NULL;
+}
+
 /* Connector funcs */
 static struct ti_sn_bridge *
 connector_to_ti_sn_bridge(struct drm_connector *connector)
@@ -869,6 +907,8 @@ static int ti_sn_bridge_probe(struct i2c_client *client,
 
 	drm_bridge_add(&pdata->bridge);
 
+	ti_sn_debugfs_init(pdata);
+
 	return 0;
 }
 
@@ -879,6 +919,8 @@ static int ti_sn_bridge_remove(struct i2c_client *client)
 	if (!pdata)
 		return -EINVAL;
 
+	ti_sn_debugfs_remove(pdata);
+
 	of_node_put(pdata->host_node);
 
 	pm_runtime_disable(pdata->dev);
-- 
2.20.1