1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/gpu/drm/bridge/dw_hdmi.c b/drivers/gpu/drm/bridge/dw_hdmi.c
index 78363552d80e..b75922d4901e 100644
--- a/drivers/gpu/drm/bridge/dw_hdmi.c
+++ b/drivers/gpu/drm/bridge/dw_hdmi.c
@@ -16,6 +16,7 @@
 #include <linux/err.h>
 #include <linux/clk.h>
 #include <linux/hdmi.h>
+#include <linux/mutex.h>
 #include <linux/of_device.h>
 
 #include <drm/drm_of.h>
@@ -126,6 +127,7 @@ struct dw_hdmi {
         struct i2c_adapter *ddc;
         void __iomem *regs;
 
+        struct mutex audio_mutex;
         unsigned int sample_rate;
         int ratio;
 
@@ -357,12 +359,16 @@ static void hdmi_set_clk_regenerator(struct dw_hdmi *hdmi,
 
 static void hdmi_init_clk_regenerator(struct dw_hdmi *hdmi)
 {
+        mutex_lock(&hdmi->audio_mutex);
         hdmi_set_clk_regenerator(hdmi, 74250000);
+        mutex_unlock(&hdmi->audio_mutex);
 }
 
 static void hdmi_clk_regenerator_update_pixel_clock(struct dw_hdmi *hdmi)
 {
+        mutex_lock(&hdmi->audio_mutex);
         hdmi_set_clk_regenerator(hdmi, hdmi->hdmi_data.video_mode.mpixelclock);
+        mutex_unlock(&hdmi->audio_mutex);
 }
 
 /*
@@ -1565,6 +1571,8 @@ int dw_hdmi_bind(struct device *dev, struct device *master,
         hdmi->ratio = 100;
         hdmi->encoder = encoder;
 
+        mutex_init(&hdmi->audio_mutex);
+
         of_property_read_u32(np, "reg-io-width", &val);
 
         switch (val) {