drm: omapdrm: dss: Store the debugfs root directory in struct dss_device

As part of an effort to remove the usage of global variables in the
driver, store the debugfs root directory in the dss_device structure
instead of a global variable.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>

drivers/gpu/drm/omapdrm/dss/dispc.c

@@ -4624,7 +4624,7 @@ static int dispc_bind(struct device *dev, struct device *master, void *data)
 
 	dispc_set_ops(&dispc_ops);
 
-	dispc.debugfs = dss_debugfs_create_file("dispc", dispc_dump_regs,
+	dispc.debugfs = dss_debugfs_create_file(dss, "dispc", dispc_dump_regs,
 						&dispc);
 
 	return 0;

drivers/gpu/drm/omapdrm/dss/dsi.c

@@ -5576,20 +5576,20 @@ static int dsi_bind(struct device *dev, struct device *master, void *data)
 	dsi_runtime_put(dsidev);
 
 	if (dsi->module_id == 0)
-		dsi->debugfs.regs = dss_debugfs_create_file("dsi1_regs",
+		dsi->debugfs.regs = dss_debugfs_create_file(dss, "dsi1_regs",
 							    dsi1_dump_regs,
 							    &dsi);
 	else
-		dsi->debugfs.regs = dss_debugfs_create_file("dsi2_regs",
+		dsi->debugfs.regs = dss_debugfs_create_file(dss, "dsi2_regs",
 							    dsi2_dump_regs,
 							    &dsi);
 #ifdef CONFIG_OMAP2_DSS_COLLECT_IRQ_STATS
 	if (dsi->module_id == 0)
-		dsi->debugfs.irqs = dss_debugfs_create_file("dsi1_irqs",
+		dsi->debugfs.irqs = dss_debugfs_create_file(dss, "dsi1_irqs",
 							    dsi1_dump_irqs,
 							    &dsi);
 	else
-		dsi->debugfs.irqs = dss_debugfs_create_file("dsi2_irqs",
+		dsi->debugfs.irqs = dss_debugfs_create_file(dss, "dsi2_irqs",
 							    dsi2_dump_irqs,
 							    &dsi);
 #endif

drivers/gpu/drm/omapdrm/dss/dss.c

@@ -901,25 +901,22 @@ static int dss_debug_dump_clocks(struct seq_file *s, void *p)
 	return 0;
 }
 
-static struct dentry *dss_debugfs_dir;
-
 static int dss_initialize_debugfs(struct dss_device *dss)
 {
-	dss_debugfs_dir = debugfs_create_dir("omapdss", NULL);
-	if (IS_ERR(dss_debugfs_dir)) {
-		int err = PTR_ERR(dss_debugfs_dir);
+	struct dentry *dir;
 
-		dss_debugfs_dir = NULL;
-		return err;
-	}
+	dir = debugfs_create_dir("omapdss", NULL);
+	if (IS_ERR(dir))
+		return PTR_ERR(dir);
+
+	dss->debugfs.root = dir;
 
 	return 0;
 }
 
-static void dss_uninitialize_debugfs(void)
+static void dss_uninitialize_debugfs(struct dss_device *dss)
 {
-	if (dss_debugfs_dir)
-		debugfs_remove_recursive(dss_debugfs_dir);
+	debugfs_remove_recursive(dss->debugfs.root);
 }
 
 struct dss_debugfs_entry {
@@ -942,8 +939,10 @@ static const struct file_operations dss_debug_fops = {
 	.release	= single_release,
 };
 
-struct dss_debugfs_entry *dss_debugfs_create_file(const char *name,
-		int (*show_fn)(struct seq_file *s, void *data), void *data)
+struct dss_debugfs_entry *
+dss_debugfs_create_file(struct dss_device *dss, const char *name,
+			int (*show_fn)(struct seq_file *s, void *data),
+			void *data)
 {
 	struct dss_debugfs_entry *entry;
 	struct dentry *d;
@@ -955,7 +954,7 @@ struct dss_debugfs_entry *dss_debugfs_create_file(const char *name,
 	entry->show_fn = show_fn;
 	entry->data = data;
 
-	d = debugfs_create_file(name, 0444, dss_debugfs_dir, entry,
+	d = debugfs_create_file(name, 0444, dss->debugfs.root, entry,
 				&dss_debug_fops);
 	if (IS_ERR(d)) {
 		kfree(entry);
@@ -980,7 +979,7 @@ static inline int dss_initialize_debugfs(struct dss_device *dss)
 {
 	return 0;
 }
-static inline void dss_uninitialize_debugfs(void)
+static inline void dss_uninitialize_debugfs(struct dss_device *dss)
 {
 }
 #endif /* CONFIG_OMAP2_DSS_DEBUGFS */
@@ -1472,9 +1471,10 @@ static int dss_probe(struct platform_device *pdev)
 	if (r)
 		goto err_pm_runtime_disable;
 
-	dss->debugfs.clk = dss_debugfs_create_file("clk", dss_debug_dump_clocks,
+	dss->debugfs.clk = dss_debugfs_create_file(dss, "clk",
+						   dss_debug_dump_clocks, dss);
+	dss->debugfs.dss = dss_debugfs_create_file(dss, "dss", dss_dump_regs,
 						   dss);
-	dss->debugfs.dss = dss_debugfs_create_file("dss", dss_dump_regs, dss);
 
 	/* Add all the child devices as components. */
 	device_for_each_child(&pdev->dev, &match, dss_add_child_component);
@@ -1488,7 +1488,7 @@ static int dss_probe(struct platform_device *pdev)
 err_uninit_debugfs:
 	dss_debugfs_remove_file(dss->debugfs.clk);
 	dss_debugfs_remove_file(dss->debugfs.dss);
-	dss_uninitialize_debugfs();
+	dss_uninitialize_debugfs(dss);
 
 err_pm_runtime_disable:
 	pm_runtime_disable(&pdev->dev);
@@ -1517,7 +1517,7 @@ static int dss_remove(struct platform_device *pdev)
 
 	dss_debugfs_remove_file(dss->debugfs.clk);
 	dss_debugfs_remove_file(dss->debugfs.dss);
-	dss_uninitialize_debugfs();
+	dss_uninitialize_debugfs(dss);
 
 	pm_runtime_disable(&pdev->dev);
 

drivers/gpu/drm/omapdrm/dss/dss.h

@@ -263,6 +263,7 @@ struct dss_device {
 	const struct dss_features *feat;
 
 	struct {
+		struct dentry *root;
 		struct dss_debugfs_entry *clk;
 		struct dss_debugfs_entry *dss;
 	} debugfs;
@@ -290,12 +291,14 @@ static inline bool dss_mgr_is_lcd(enum omap_channel id)
 
 /* DSS */
 #if defined(CONFIG_OMAP2_DSS_DEBUGFS)
-struct dss_debugfs_entry *dss_debugfs_create_file(const char *name,
-		int (*show_fn)(struct seq_file *s, void *data), void *data);
+struct dss_debugfs_entry *
+dss_debugfs_create_file(struct dss_device *dss, const char *name,
+			int (*show_fn)(struct seq_file *s, void *data),
+			void *data);
 void dss_debugfs_remove_file(struct dss_debugfs_entry *entry);
 #else
 static inline struct dss_debugfs_entry *
-dss_debugfs_create_file(const char *name,
+dss_debugfs_create_file(struct dss_device *dss, const char *name,
 			int (*show_fn)(struct seq_file *s, void *data),
 			void *data)
 {

drivers/gpu/drm/omapdrm/dss/hdmi4.c

@@ -780,7 +780,8 @@ static int hdmi4_bind(struct device *dev, struct device *master, void *data)
 		return r;
 	}
 
-	hdmi.debugfs = dss_debugfs_create_file("hdmi", hdmi_dump_regs, &hdmi);
+	hdmi.debugfs = dss_debugfs_create_file(dss, "hdmi", hdmi_dump_regs,
+					       &hdmi);
 
 	return 0;
 err:

drivers/gpu/drm/omapdrm/dss/hdmi5.c

@@ -777,7 +777,8 @@ static int hdmi5_bind(struct device *dev, struct device *master, void *data)
 		return r;
 	}
 
-	hdmi.debugfs = dss_debugfs_create_file("hdmi", hdmi_dump_regs, &hdmi);
+	hdmi.debugfs = dss_debugfs_create_file(dss, "hdmi", hdmi_dump_regs,
+					       &hdmi);
 
 	return 0;
 err:

drivers/gpu/drm/omapdrm/dss/venc.c

@@ -917,7 +917,8 @@ static int venc_bind(struct device *dev, struct device *master, void *data)
 		goto err_probe_of;
 	}
 
-	venc.debugfs = dss_debugfs_create_file("venc", venc_dump_regs, &venc);
+	venc.debugfs = dss_debugfs_create_file(dss, "venc", venc_dump_regs,
+						&venc);
 
 	venc_init_output(pdev);