drm/msm/dp: add debugfs nodes for video pattern tests

Add the debugfs nodes needed for the video pattern
compliance tests to MSM DP driver.

Changes in v2: rebase on top of latest patchset of dependency

Signed-off-by: Abhinav Kumar <abhinavk@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>

2 files changed, 207 insertions, 0 deletions

diff --git a/drivers/gpu/drm/msm/dp/dp_debug.c b/drivers/gpu/drm/msm/dp/dp_debug.c
index 450f65060202..84670bcdcfea 100644
--- a/drivers/gpu/drm/msm/dp/dp_debug.c
+++ b/drivers/gpu/drm/msm/dp/dp_debug.c
@@ -203,17 +203,174 @@ static ssize_t dp_debug_read_info(struct file *file, char __user *user_buff,
 	return -EINVAL;
 }
 
+static int dp_test_data_show(struct seq_file *m, void *data)
+{
+	struct drm_device *dev;
+	struct dp_debug_private *debug;
+	struct drm_connector *connector;
+	struct drm_connector_list_iter conn_iter;
+	u32 bpc;
+
+	debug = m->private;
+	dev = debug->drm_dev;
+	drm_connector_list_iter_begin(dev, &conn_iter);
+	drm_for_each_connector_iter(connector, &conn_iter) {
+
+		if (connector->connector_type !=
+			DRM_MODE_CONNECTOR_DisplayPort)
+			continue;
+
+		if (connector->status == connector_status_connected) {
+			bpc = debug->link->test_video.test_bit_depth;
+			seq_printf(m, "hdisplay: %d\n",
+					debug->link->test_video.test_h_width);
+			seq_printf(m, "vdisplay: %d\n",
+					debug->link->test_video.test_v_height);
+					seq_printf(m, "bpc: %u\n",
+					dp_link_bit_depth_to_bpc(bpc));
+		} else
+			seq_puts(m, "0");
+	}
+
+	drm_connector_list_iter_end(&conn_iter);
+
+	return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(dp_test_data);
+
+static int dp_test_type_show(struct seq_file *m, void *data)
+{
+	struct dp_debug_private *debug = m->private;
+	struct drm_device *dev = debug->drm_dev;
+	struct drm_connector *connector;
+	struct drm_connector_list_iter conn_iter;
+
+	drm_connector_list_iter_begin(dev, &conn_iter);
+	drm_for_each_connector_iter(connector, &conn_iter) {
+
+		if (connector->connector_type !=
+			DRM_MODE_CONNECTOR_DisplayPort)
+			continue;
+
+		if (connector->status == connector_status_connected)
+			seq_printf(m, "%02x", DP_TEST_LINK_VIDEO_PATTERN);
+		else
+			seq_puts(m, "0");
+	}
+	drm_connector_list_iter_end(&conn_iter);
+
+	return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(dp_test_type);
+
+static ssize_t dp_test_active_write(struct file *file,
+		const char __user *ubuf,
+		size_t len, loff_t *offp)
+{
+	char *input_buffer;
+	int status = 0;
+	struct dp_debug_private *debug;
+	struct drm_device *dev;
+	struct drm_connector *connector;
+	struct drm_connector_list_iter conn_iter;
+	int val = 0;
+
+	debug = ((struct seq_file *)file->private_data)->private;
+	dev = debug->drm_dev;
+
+	if (len == 0)
+		return 0;
+
+	input_buffer = memdup_user_nul(ubuf, len);
+	if (IS_ERR(input_buffer))
+		return PTR_ERR(input_buffer);
+
+	DRM_DEBUG_DRIVER("Copied %d bytes from user\n", (unsigned int)len);
+
+	drm_connector_list_iter_begin(dev, &conn_iter);
+	drm_for_each_connector_iter(connector, &conn_iter) {
+		if (connector->connector_type !=
+			DRM_MODE_CONNECTOR_DisplayPort)
+			continue;
+
+		if (connector->status == connector_status_connected) {
+			status = kstrtoint(input_buffer, 10, &val);
+			if (status < 0)
+				break;
+			DRM_DEBUG_DRIVER("Got %d for test active\n", val);
+			/* To prevent erroneous activation of the compliance
+			 * testing code, only accept an actual value of 1 here
+			 */
+			if (val == 1)
+				debug->panel->video_test = true;
+			else
+				debug->panel->video_test = false;
+		}
+	}
+	drm_connector_list_iter_end(&conn_iter);
+	kfree(input_buffer);
+	if (status < 0)
+		return status;
+
+	*offp += len;
+	return len;
+}
+
+static int dp_test_active_show(struct seq_file *m, void *data)
+{
+	struct dp_debug_private *debug = m->private;
+	struct drm_device *dev = debug->drm_dev;
+	struct drm_connector *connector;
+	struct drm_connector_list_iter conn_iter;
+
+	drm_connector_list_iter_begin(dev, &conn_iter);
+	drm_for_each_connector_iter(connector, &conn_iter) {
+		if (connector->connector_type !=
+			DRM_MODE_CONNECTOR_DisplayPort)
+			continue;
+
+		if (connector->status == connector_status_connected) {
+			if (debug->panel->video_test)
+				seq_puts(m, "1");
+			else
+				seq_puts(m, "0");
+		} else
+			seq_puts(m, "0");
+	}
+	drm_connector_list_iter_end(&conn_iter);
+
+	return 0;
+}
+
+static int dp_test_active_open(struct inode *inode,
+		struct file *file)
+{
+	return single_open(file, dp_test_active_show,
+			inode->i_private);
+}
+
 static const struct file_operations dp_debug_fops = {
 	.open = simple_open,
 	.read = dp_debug_read_info,
 };
 
+static const struct file_operations test_active_fops = {
+	.owner = THIS_MODULE,
+	.open = dp_test_active_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = single_release,
+	.write = dp_test_active_write
+};
+
 static int dp_debug_init(struct dp_debug *dp_debug, struct drm_minor *minor)
 {
 	int rc = 0;
 	struct dp_debug_private *debug = container_of(dp_debug,
 			struct dp_debug_private, dp_debug);
 	struct dentry *file;
+	struct dentry *test_active;
+	struct dentry *test_data, *test_type;
 
 	file = debugfs_create_file("dp_debug", 0444, minor->debugfs_root,
 			debug, &dp_debug_fops);
@@ -223,6 +380,33 @@ static int dp_debug_init(struct dp_debug *dp_debug, struct drm_minor *minor)
 				  DEBUG_NAME, rc);
 	}
 
+	test_active = debugfs_create_file("msm_dp_test_active", 0444,
+			minor->debugfs_root,
+			debug, &test_active_fops);
+	if (IS_ERR_OR_NULL(test_active)) {
+		rc = PTR_ERR(test_active);
+		DRM_ERROR("[%s] debugfs test_active failed, rc=%d\n",
+				  DEBUG_NAME, rc);
+	}
+
+	test_data = debugfs_create_file("msm_dp_test_data", 0444,
+			minor->debugfs_root,
+			debug, &dp_test_data_fops);
+	if (IS_ERR_OR_NULL(test_data)) {
+		rc = PTR_ERR(test_data);
+		DRM_ERROR("[%s] debugfs test_data failed, rc=%d\n",
+				  DEBUG_NAME, rc);
+	}
+
+	test_type = debugfs_create_file("msm_dp_test_type", 0444,
+			minor->debugfs_root,
+			debug, &dp_test_type_fops);
+	if (IS_ERR_OR_NULL(test_type)) {
+		rc = PTR_ERR(test_type);
+		DRM_ERROR("[%s] debugfs test_type failed, rc=%d\n",
+				  DEBUG_NAME, rc);
+	}
+
 	debug->root = minor->debugfs_root;
 
 	return rc;
diff --git a/drivers/gpu/drm/msm/dp/dp_link.h b/drivers/gpu/drm/msm/dp/dp_link.h
index e9d54db8fb61..49811b6221e5 100644
--- a/drivers/gpu/drm/msm/dp/dp_link.h
+++ b/drivers/gpu/drm/msm/dp/dp_link.h
@@ -112,6 +112,29 @@ static inline u32 dp_link_bit_depth_to_bpp(u32 tbd)
 	}
 }
 
+/**
+ * dp_test_bit_depth_to_bpc() - convert test bit depth to bpc
+ * @tbd: test bit depth
+ *
+ * Returns the bits per comp (bpc) to be used corresponding to the
+ * bit depth value. This function assumes that bit depth has
+ * already been validated.
+ */
+static inline u32 dp_link_bit_depth_to_bpc(u32 tbd)
+{
+	switch (tbd) {
+	case DP_TEST_BIT_DEPTH_6:
+		return 6;
+	case DP_TEST_BIT_DEPTH_8:
+		return 8;
+	case DP_TEST_BIT_DEPTH_10:
+		return 10;
+	case DP_TEST_BIT_DEPTH_UNKNOWN:
+	default:
+		return 0;
+	}
+}
+
 u32 dp_link_get_test_bits_depth(struct dp_link *dp_link, u32 bpp);
 int dp_link_process_request(struct dp_link *dp_link);
 int dp_link_get_colorimetry_config(struct dp_link *dp_link);