diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c
index fb16a176822d..f2f101220ade 100644
--- a/drivers/gpu/drm/bridge/ite-it6505.c
+++ b/drivers/gpu/drm/bridge/ite-it6505.c
@@ -289,7 +289,7 @@
 #define WORD_LENGTH_20BIT 2
 #define WORD_LENGTH_24BIT 3
 #define DEBUGFS_DIR_NAME "it6505-debugfs"
-#define READ_BUFFER_SIZE 200
+#define READ_BUFFER_SIZE 400
 
 /* Vendor option */
 #define HDCP_DESIRED 1
@@ -3074,7 +3074,7 @@ static ssize_t receive_timing_debugfs_show(struct file *file, char __user *buf,
 	struct it6505 *it6505 = file->private_data;
 	struct drm_display_mode *vid = &it6505->video_info;
 	u8 read_buf[READ_BUFFER_SIZE];
-	u8 *str = read_buf, *end = read_buf + PAGE_SIZE;
+	u8 *str = read_buf, *end = read_buf + READ_BUFFER_SIZE;
 	ssize_t ret, count;
 
 	if (!it6505)