samsung: support sysfs counter node for decon

Bug: 240346564
Test: Build for C10 or O6 device,
  cat /sys/class/drm/card0/device/decon0/decon_counters
  or same with decon2 device
Merged-In: Ief68f59dc5207367c731b75bc7cf550dd7629280
Change-Id: Ief68f59dc5207367c731b75bc7cf550dd7629280
Signed-off-by: Taylor Nelms <tknelms@google.com>

3 files changed, 57 insertions, 1 deletions

diff --git a/samsung/exynos_drm_debug.c b/samsung/exynos_drm_debug.c
index fbd50e2..5765e9b 100644
--- a/samsung/exynos_drm_debug.c
+++ b/samsung/exynos_drm_debug.c
@@ -16,6 +16,7 @@
 #include <linux/ktime.h>
 #include <linux/moduleparam.h>
 #include <linux/pm_runtime.h>
+#include <linux/sysfs.h>
 #include <linux/time.h>
 #include <video/mipi_display.h>
 #include <drm/drm_print.h>
@@ -1415,6 +1416,34 @@ err:
 	debugfs_remove_recursive(dent_dir);
 }
 
+static ssize_t decon_counters_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	uint32_t underrun_cnt, crc_cnt, ecc_cnt, idma_err_cnt;
+	const struct decon_device *decon = to_decon_device(dev);
+
+	if (!decon)
+		return -ENODEV;
+
+	underrun_cnt = decon->d.underrun_cnt;
+	crc_cnt = decon->d.crc_cnt;
+	ecc_cnt = decon->d.ecc_cnt;
+	idma_err_cnt = decon->d.idma_err_cnt;
+
+	return snprintf(buf, PAGE_SIZE,
+			"underrun_cnt: %u\n"
+			"crc_cnt: %u\n"
+			"ecc_cnt: %u\n"
+			"idma_err_cnt: %u\n",
+			underrun_cnt, crc_cnt, ecc_cnt, idma_err_cnt);
+}
+
+static DEVICE_ATTR_RO(decon_counters);
+
+static const struct attribute *decon_debug_attrs[] = {
+	&dev_attr_decon_counters.attr,
+	NULL
+};
+
 static int hibernation_show(struct seq_file *s, void *unused)
 {
 	struct decon_device *decon = s->private;
@@ -1572,6 +1601,7 @@ int dpu_init_debug(struct decon_device *decon)
 	struct exynos_dqe *dqe = decon->dqe;
 	struct dentry *debug_event;
 	struct dentry *urgent_dent;
+	int ret;
 
 	decon->d.event_log = NULL;
 	event_cnt = dpu_event_log_max;
@@ -1617,6 +1647,11 @@ int dpu_init_debug(struct decon_device *decon)
 		goto err_debugfs;
 	}
 
+	/* Create sysfs nodes */
+	ret = sysfs_create_files(&decon->dev->kobj, decon_debug_attrs);
+	if (ret)
+		pr_warn("unable to add decon_debug sysfs files (%d)\n", ret);
+
 	debugfs_create_file("force_te_on", 0664, crtc->debugfs_entry, decon, &force_te_fops);
 	debugfs_create_u32("underrun_cnt", 0664, crtc->debugfs_entry, &decon->d.underrun_cnt);
 	debugfs_create_u32("crc_cnt", 0444, crtc->debugfs_entry, &decon->d.crc_cnt);
diff --git a/samsung/exynos_drm_decon.c b/samsung/exynos_drm_decon.c
index 22c1871..cfc2999 100644
--- a/samsung/exynos_drm_decon.c
+++ b/samsung/exynos_drm_decon.c
@@ -1547,6 +1547,7 @@ static int decon_bind(struct device *dev, struct device *master, void *data)
 	struct exynos_drm_private *priv = drm_to_exynos_dev(drm_dev);
 	struct drm_plane *default_plane;
 	int i;
+	char symlink_name_buffer[7];
 
 	decon->drm_dev = drm_dev;
 
@@ -1591,6 +1592,11 @@ static int decon_bind(struct device *dev, struct device *master, void *data)
 		decon->bts.ops->init(decon);
 	}
 
+	/* Create symlink to decon device */
+	snprintf(symlink_name_buffer, 7, "decon%d", decon->id);
+	sysfs_create_link(&decon->drm_dev->dev->kobj, &decon->dev->kobj,
+			  (const char *) symlink_name_buffer);
+
 	device_create_file(dev, &dev_attr_early_wakeup);
 	decon_debug(decon, "%s -\n", __func__);
 	return 0;
@@ -1599,9 +1605,15 @@ static int decon_bind(struct device *dev, struct device *master, void *data)
 static void decon_unbind(struct device *dev, struct device *master,
 			void *data)
 {
+	char symlink_name_buffer[7];
 	struct decon_device *decon = dev_get_drvdata(dev);
-
 	decon_debug(decon, "%s +\n", __func__);
+
+	/* Remove symlink to decon device */
+	snprintf(symlink_name_buffer, 7, "decon%d", decon->id);
+	sysfs_remove_link(&decon->drm_dev->dev->kobj,
+			  (const char *) symlink_name_buffer);
+
 	device_remove_file(dev, &dev_attr_early_wakeup);
 	if (IS_ENABLED(CONFIG_EXYNOS_BTS))
 		decon->bts.ops->deinit(decon);
diff --git a/samsung/exynos_drm_decon.h b/samsung/exynos_drm_decon.h
index 69f707d..7e52f44 100644
--- a/samsung/exynos_drm_decon.h
+++ b/samsung/exynos_drm_decon.h
@@ -482,6 +482,15 @@ struct decon_device {
 	struct exynos_partial *partial;
 };
 
+static inline struct decon_device *to_decon_device(const struct device *dev)
+{
+	/* could skip with dev_get_drvdata directly, but using pdev because
+	that's how drvdata was set originally */
+	struct platform_device *pdev = to_platform_device(dev);
+
+	return (struct decon_device *)platform_get_drvdata(pdev);
+}
+
 extern struct dpu_bts_ops dpu_bts_control;
 extern struct decon_device *decon_drvdata[MAX_DECON_CNT];