Add support for DVI monitors

Signed-off-by: Robert Winkler <robert.winkler@boundarydevices.com>
Acked-by: Max Krummenacher <max.krummenacher@toradex.com>
(cherry picked from commit 6877ada3d15adf762cae8b7edce979a77ebc0313)
(cherry picked from commit 51394b5f2b7ecfcc87c43c41e630c3e49fce3003)

1 files changed, 43 insertions, 57 deletions

diff --git a/drivers/video/fbdev/mxc/mxc_hdmi.c b/drivers/video/fbdev/mxc/mxc_hdmi.c
index 6bb39f9795d1..e3b164e2f1bb 100644
--- a/drivers/video/fbdev/mxc/mxc_hdmi.c
+++ b/drivers/video/fbdev/mxc/mxc_hdmi.c
@@ -162,7 +162,6 @@ struct mxc_hdmi {
 	bool dft_mode_set;
 	char *dft_mode_str;
 	int default_bpp;
-	u8 latest_intr_stat;
 	bool irq_enabled;
 	spinlock_t irq_lock;
 	bool phy_enabled;
@@ -2009,58 +2008,48 @@ static void hotplug_worker(struct work_struct *work)
 	struct delayed_work *delay_work = to_delayed_work(work);
 	struct mxc_hdmi *hdmi =
 		container_of(delay_work, struct mxc_hdmi, hotplug_work);
-	u32 phy_int_stat, phy_int_pol, phy_int_mask;
-	u8 val;
+	u32 hdmi_phy_stat0, hdmi_phy_pol0, hdmi_phy_mask0;
 	unsigned long flags;
 	char event_string[32];
 	char *envp[] = { event_string, NULL };
 
-	phy_int_stat = hdmi->latest_intr_stat;
-	phy_int_pol = hdmi_readb(HDMI_PHY_POL0);
 
-	dev_dbg(&hdmi->pdev->dev, "phy_int_stat=0x%x, phy_int_pol=0x%x\n",
-			phy_int_stat, phy_int_pol);
+	hdmi_phy_stat0 = hdmi_readb(HDMI_PHY_STAT0);
+	hdmi_phy_pol0 = hdmi_readb(HDMI_PHY_POL0);
+
+	dev_dbg(&hdmi->pdev->dev, "hdmi_phy_stat0=0x%x, hdmi_phy_pol0=0x%x\n",
+			hdmi_phy_stat0, hdmi_phy_pol0);
+
+	/* Make HPD intr active low to capture unplug event or
+	 * active high to capture plugin event */
+	hdmi_writeb((HDMI_DVI_STAT & ~hdmi_phy_stat0), HDMI_PHY_POL0);
 
 	/* check cable status */
-	if (phy_int_stat & HDMI_IH_PHY_STAT0_HPD) {
-		/* cable connection changes */
-		if (phy_int_pol & HDMI_PHY_HPD) {
-			/* Plugin event */
-			dev_dbg(&hdmi->pdev->dev, "EVENT=plugin\n");
-			mxc_hdmi_cable_connected(hdmi);
-
-			/* Make HPD intr active low to capture unplug event */
-			val = hdmi_readb(HDMI_PHY_POL0);
-			val &= ~HDMI_PHY_HPD;
-			hdmi_writeb(val, HDMI_PHY_POL0);
-
-			hdmi_set_cable_state(1);
-
-			sprintf(event_string, "EVENT=plugin");
-			kobject_uevent_env(&hdmi->pdev->dev.kobj, KOBJ_CHANGE, envp);
+	if (hdmi_phy_stat0 & HDMI_DVI_STAT) {
+		/* Plugin event */
+		dev_dbg(&hdmi->pdev->dev, "EVENT=plugin\n");
+		mxc_hdmi_cable_connected(hdmi);
+
+		hdmi_set_cable_state(1);
+
+		sprintf(event_string, "EVENT=plugin");
+		kobject_uevent_env(&hdmi->pdev->dev.kobj, KOBJ_CHANGE, envp);
 #ifdef CONFIG_MXC_HDMI_CEC
-			mxc_hdmi_cec_handle(0x80);
+		mxc_hdmi_cec_handle(0x80);
 #endif
-		} else if (!(phy_int_pol & HDMI_PHY_HPD)) {
-			/* Plugout event */
-			dev_dbg(&hdmi->pdev->dev, "EVENT=plugout\n");
-			hdmi_set_cable_state(0);
-			mxc_hdmi_abort_stream();
-			mxc_hdmi_cable_disconnected(hdmi);
-
-			/* Make HPD intr active high to capture plugin event */
-			val = hdmi_readb(HDMI_PHY_POL0);
-			val |= HDMI_PHY_HPD;
-			hdmi_writeb(val, HDMI_PHY_POL0);
+	} else {
+		/* Plugout event */
+		dev_dbg(&hdmi->pdev->dev, "EVENT=plugout\n");
+		hdmi_set_cable_state(0);
+		mxc_hdmi_abort_stream();
+		mxc_hdmi_cable_disconnected(hdmi);
 
-			sprintf(event_string, "EVENT=plugout");
-			kobject_uevent_env(&hdmi->pdev->dev.kobj, KOBJ_CHANGE, envp);
+		sprintf(event_string, "EVENT=plugout");
+		kobject_uevent_env(&hdmi->pdev->dev.kobj, KOBJ_CHANGE, envp);
 #ifdef CONFIG_MXC_HDMI_CEC
-			mxc_hdmi_cec_handle(0x100);
+		mxc_hdmi_cec_handle(0x100);
 #endif
 
-		} else
-			dev_dbg(&hdmi->pdev->dev, "EVENT=none?\n");
 	}
 
 	/* Lock here to ensure full powerdown sequence
@@ -2068,12 +2057,12 @@ static void hotplug_worker(struct work_struct *work)
 	spin_lock_irqsave(&hdmi->irq_lock, flags);
 
 	/* Re-enable HPD interrupts */
-	phy_int_mask = hdmi_readb(HDMI_PHY_MASK0);
-	phy_int_mask &= ~HDMI_PHY_HPD;
-	hdmi_writeb(phy_int_mask, HDMI_PHY_MASK0);
+	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_IH_MUTE_PHY_STAT0_HPD, HDMI_IH_MUTE_PHY_STAT0);
+	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);
@@ -2099,7 +2088,7 @@ static void hdcp_hdp_worker(struct work_struct *work)
 static irqreturn_t mxc_hdmi_hotplug(int irq, void *data)
 {
 	struct mxc_hdmi *hdmi = data;
-	u8 val, intr_stat;
+	u8 val;
 	unsigned long flags;
 
 	spin_lock_irqsave(&hdmi->irq_lock, flags);
@@ -2121,25 +2110,22 @@ static irqreturn_t mxc_hdmi_hotplug(int irq, void *data)
 	 * HDMI registers.
 	 */
 	/* Capture status - used in hotplug_worker ISR */
-	intr_stat = hdmi_readb(HDMI_IH_PHY_STAT0);
-
-	if (intr_stat & HDMI_IH_PHY_STAT0_HPD) {
+	if (hdmi_readb(HDMI_IH_PHY_STAT0) & HDMI_DVI_IH_STAT) {
 
 		dev_dbg(&hdmi->pdev->dev, "Hotplug interrupt received\n");
-		hdmi->latest_intr_stat = intr_stat;
 
 		/* Mute interrupts until handled */
 
 		val = hdmi_readb(HDMI_IH_MUTE_PHY_STAT0);
-		val |= HDMI_IH_MUTE_PHY_STAT0_HPD;
+		val |= HDMI_DVI_IH_STAT;
 		hdmi_writeb(val, HDMI_IH_MUTE_PHY_STAT0);
 
 		val = hdmi_readb(HDMI_PHY_MASK0);
-		val |= HDMI_PHY_HPD;
+		val |= HDMI_DVI_STAT;
 		hdmi_writeb(val, HDMI_PHY_MASK0);
 
 		/* Clear Hotplug interrupts */
-		hdmi_writeb(HDMI_IH_PHY_STAT0_HPD, HDMI_IH_PHY_STAT0);
+		hdmi_writeb(HDMI_DVI_IH_STAT, HDMI_IH_PHY_STAT0);
 
 		schedule_delayed_work(&(hdmi->hotplug_work), msecs_to_jiffies(20));
 	}
@@ -2291,13 +2277,13 @@ static void mxc_hdmi_fb_registered(struct mxc_hdmi *hdmi)
 		    HDMI_PHY_I2CM_CTLINT_ADDR);
 
 	/* enable cable hot plug irq */
-	hdmi_writeb((u8)~HDMI_PHY_HPD, HDMI_PHY_MASK0);
+	hdmi_writeb((u8)~HDMI_DVI_STAT, HDMI_PHY_MASK0);
 
 	/* Clear Hotplug interrupts */
-	hdmi_writeb(HDMI_IH_PHY_STAT0_HPD, HDMI_IH_PHY_STAT0);
+	hdmi_writeb(HDMI_DVI_IH_STAT, HDMI_IH_PHY_STAT0);
 
 	/* Unmute interrupts */
-	hdmi_writeb(~HDMI_IH_MUTE_PHY_STAT0_HPD, HDMI_IH_MUTE_PHY_STAT0);
+	hdmi_writeb(~HDMI_DVI_IH_STAT, HDMI_IH_MUTE_PHY_STAT0);
 
 	hdmi->fb_reg = true;
 
@@ -2628,10 +2614,10 @@ static int mxc_hdmi_disp_init(struct mxc_dispdrv_handle *disp,
 
 	/* Configure registers related to HDMI interrupt
 	 * generation before registering IRQ. */
-	hdmi_writeb(HDMI_PHY_HPD, HDMI_PHY_POL0);
+	hdmi_writeb(HDMI_DVI_STAT, HDMI_PHY_POL0);
 
 	/* Clear Hotplug interrupts */
-	hdmi_writeb(HDMI_IH_PHY_STAT0_HPD, HDMI_IH_PHY_STAT0);
+	hdmi_writeb(HDMI_DVI_IH_STAT, HDMI_IH_PHY_STAT0);
 
 	hdmi->nb.notifier_call = mxc_hdmi_fb_event;
 	ret = fb_register_client(&hdmi->nb);