PKGBUILDs/core/linux-imx6/fix_cec.patch

diff -ruN a/drivers/mxc/hdmi-cec/mxc_hdmi-cec.c b/drivers/mxc/hdmi-cec/mxc_hdmi-cec.c
--- a/drivers/mxc/hdmi-cec/mxc_hdmi-cec.c	2016-03-20 07:16:03.000000000 -0600
+++ b/drivers/mxc/hdmi-cec/mxc_hdmi-cec.c	2016-03-27 02:38:59.095101603 -0600
@@ -67,7 +67,6 @@
 	u8 msg_len;
 	int tx_answer;
 	u16 latest_cec_stat;
-	u8 link_status;
 	spinlock_t irq_lock;
 	struct delayed_work hdmi_cec_work;
 	struct mutex lock;
@@ -83,8 +82,6 @@
 
 static LIST_HEAD(head);
 
-static int hdmi_cec_ready = 0;
-static int hdmi_cec_started;
 static int hdmi_cec_major;
 static struct class *hdmi_cec_class;
 static struct hdmi_cec_priv hdmi_cec_data;
@@ -98,7 +95,6 @@
 	struct hdmi_cec_priv *hdmi_cec = data;
 	u16 cec_stat = 0;
 	unsigned long flags;
-	u8 phy_stat0;
 
 	spin_lock_irqsave(&hdmi_cec->irq_lock, flags);
 
@@ -106,15 +102,7 @@
 
 	cec_stat = hdmi_readb(HDMI_IH_CEC_STAT0);
 	hdmi_writeb(cec_stat, HDMI_IH_CEC_STAT0);
-	phy_stat0 = hdmi_readb(HDMI_PHY_STAT0) & 0x02;
-	if (hdmi_cec->link_status ^ phy_stat0) {
-		/* HPD value changed */
-		hdmi_cec->link_status = phy_stat0;
-		if (hdmi_cec->link_status)
-			cec_stat |= 0x80; /* Connected */
-		else
-			cec_stat |= 0x100; /* Disconnected */
-	}
+
 	if ((cec_stat & (HDMI_IH_CEC_STAT0_ERROR_INIT | \
 		HDMI_IH_CEC_STAT0_NACK | HDMI_IH_CEC_STAT0_EOM | \
 		HDMI_IH_CEC_STAT0_DONE | 0x180)) == 0) {
@@ -314,7 +302,7 @@
 		mutex_unlock(&hdmi_cec_data.lock);
 		return -EACCES;
 	}
-	/* Ensure that there is only one writer who is the only listener of tx_cec_queue */
+	/* Ensure that there is only one writer who is the unique listener of tx_cec_queue */
 	if (hdmi_cec_data.tx_answer != CEC_TX_AVAIL) {
 		mutex_unlock(&hdmi_cec_data.lock);
 		return -EBUSY;
@@ -362,9 +350,6 @@
 {
 	u8 val;
 
-	if (!hdmi_cec_ready || hdmi_cec_started)
-		return;
-
 	val = hdmi_readb(HDMI_MC_CLKDIS);
 	val &= ~HDMI_MC_CLKDIS_CECCLK_DISABLE;
 	hdmi_writeb(val, HDMI_MC_CLKDIS);
@@ -376,12 +361,7 @@
 	val = HDMI_IH_CEC_STAT0_WAKEUP | HDMI_IH_CEC_STAT0_ERROR_FOLL | HDMI_IH_CEC_STAT0_ARB_LOST;
 	hdmi_writeb(val, HDMI_CEC_MASK);
 	hdmi_writeb(val, HDMI_IH_MUTE_CEC_STAT0);
-	hdmi_cec_data.link_status = hdmi_readb(HDMI_PHY_STAT0) & 0x02;
-	mutex_lock(&hdmi_cec_data.lock);
 	hdmi_cec_data.cec_state = true;
-	mutex_unlock(&hdmi_cec_data.lock);
-
-	hdmi_cec_started = 1;
 }
 EXPORT_SYMBOL(hdmi_cec_start_device);
 
@@ -389,9 +369,6 @@
 { 
 	u8 val;
 
-	if (!hdmi_cec_ready || !hdmi_cec_started)
-		return;
-
 	hdmi_writeb(0x10, HDMI_CEC_CTRL);
 	val = HDMI_IH_CEC_STAT0_WAKEUP | HDMI_IH_CEC_STAT0_ERROR_FOLL | HDMI_IH_CEC_STAT0_ERROR_INIT | HDMI_IH_CEC_STAT0_ARB_LOST | \
 			HDMI_IH_CEC_STAT0_NACK | HDMI_IH_CEC_STAT0_EOM | HDMI_IH_CEC_STAT0_DONE;
@@ -401,11 +378,7 @@
 	val = hdmi_readb(HDMI_MC_CLKDIS);
 	val |= HDMI_MC_CLKDIS_CECCLK_DISABLE;
 	hdmi_writeb(val, HDMI_MC_CLKDIS);
-	mutex_lock(&hdmi_cec_data.lock);
 	hdmi_cec_data.cec_state = false;
-	mutex_unlock(&hdmi_cec_data.lock);
-
-	hdmi_cec_started = 0;
 }
 EXPORT_SYMBOL(hdmi_cec_stop_device);
 
@@ -480,11 +453,18 @@
  */
 static int hdmi_cec_release(struct inode *inode, struct file *filp)
 {
+	struct hdmi_cec_event *event, *tmp_event;
 	mutex_lock(&hdmi_cec_data.lock);
 	if (open_count) {
 		open_count = 0;
 		hdmi_cec_data.cec_state = false;
 		hdmi_cec_data.Logical_address = 15;
+
+		/* Flush eventual events which have not been read by user space */
+		list_for_each_entry_safe(event, tmp_event, &head, list) {
+			list_del(&event->list);
+			vfree(event);
+		}
 	}
 	mutex_unlock(&hdmi_cec_data.lock);
 
@@ -579,7 +559,6 @@
 	INIT_DELAYED_WORK(&hdmi_cec_data.hdmi_cec_work, mxc_hdmi_cec_worker);
 
 	dev_info(&pdev->dev, "HDMI CEC initialized\n");
-	hdmi_cec_ready = 1;
 	goto out;
 
 err_out_class: