mxc_hdmi: default to keep-alive (don't detect disconnect)

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
(cherry picked from commit 60709839eda8310d86b778aab8c2c22844e4141c)

Author: Eric Nelson

drivers/video/mxc/mxc_hdmi.c

@@ -941,6 +941,9 @@ static u8 hdmi_edid_i2c_read(struct mxc_hdmi *hdmi,
 	return data;
 }
 
+static int keepalive=1;
+module_param(keepalive, int, 0644);
+MODULE_PARM_DESC(keepalive, "Allow only CEA modes");
 
 /* "Power-down enable (active low)"
  * That mean that power up == 1! */
@@ -1987,6 +1990,7 @@ static void hotplug_worker(struct work_struct *work)
 	u32 hdmi_phy_stat0, hdmi_phy_pol0, hdmi_phy_mask0;
 	unsigned long flags;
 	char event_string[32];
+	int isalive = 0;
 	char *envp[] = { event_string, NULL };
 
 
@@ -2013,7 +2017,10 @@ static void hotplug_worker(struct work_struct *work)
 #endif
 		hdmi_set_cable_state(1);
 
-	} else {
+		if (keepalive)
+                        hdmi_writeb(HDMI_DVI_STAT, HDMI_PHY_POL0);
+		isalive=1;
+	} else if (!keepalive) {
 		/* Plugout event */
 		dev_dbg(&hdmi->pdev->dev, "EVENT=plugout\n");
 		hdmi_set_cable_state(0);
@@ -2032,16 +2039,18 @@ static void hotplug_worker(struct work_struct *work)
 	 * completed before next interrupt processed */
 	spin_lock_irqsave(&hdmi->irq_lock, flags);
 
-	/* Re-enable HPD interrupts */
-	hdmi_phy_mask0 = hdmi_readb(HDMI_PHY_MASK0);
-	hdmi_phy_mask0 &= ~HDMI_DVI_STAT;
-	hdmi_writeb(hdmi_phy_mask0, HDMI_PHY_MASK0);
+	if (!(keepalive || isalive)) {
+		/* Re-enable HPD interrupts */
+		hdmi_phy_mask0 = hdmi_readb(HDMI_PHY_MASK0);
+		hdmi_phy_mask0 &= ~HDMI_DVI_STAT;
+		hdmi_writeb(hdmi_phy_mask0, HDMI_PHY_MASK0);
 
-	/* Unmute interrupts */
-	hdmi_writeb(~HDMI_DVI_IH_STAT, HDMI_IH_MUTE_PHY_STAT0);
+		/* Unmute interrupts */
+		hdmi_writeb(~HDMI_DVI_IH_STAT, HDMI_IH_MUTE_PHY_STAT0);
 
-	if (hdmi_readb(HDMI_IH_FC_STAT2) & HDMI_IH_FC_STAT2_OVERFLOW_MASK)
-		mxc_hdmi_clear_overflow(hdmi);
+		if (hdmi_readb(HDMI_IH_FC_STAT2) & HDMI_IH_FC_STAT2_OVERFLOW_MASK)
+			mxc_hdmi_clear_overflow(hdmi);
+	}
 
 	spin_unlock_irqrestore(&hdmi->irq_lock, flags);
 }