omapdrm: hdmi4: hook up the HDMI CEC support

Hook up the HDMI CEC support in the hdmi4 driver.

It add the CEC irq handler, the CEC (un)init calls and tells the CEC
implementation when the physical address changes.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/gpu/drm/omapdrm/dss/Kconfig

@@ -65,6 +65,14 @@ config OMAP4_DSS_HDMI
 	help
 	  HDMI support for OMAP4 based SoCs.
 
+config OMAP4_DSS_HDMI_CEC
+	bool "Enable HDMI CEC support for OMAP4"
+	depends on OMAP4_DSS_HDMI
+	select CEC_CORE
+	default y
+	---help---
+	  When selected the HDMI transmitter will support the CEC feature.
+
 config OMAP5_DSS_HDMI
 	bool "HDMI support for OMAP5"
 	default n

drivers/gpu/drm/omapdrm/dss/Makefile

@@ -14,5 +14,6 @@ omapdss-$(CONFIG_OMAP2_DSS_DSI) += dsi.o
 omapdss-$(CONFIG_OMAP2_DSS_HDMI_COMMON) += hdmi_common.o hdmi_wp.o hdmi_pll.o \
 	hdmi_phy.o
 omapdss-$(CONFIG_OMAP4_DSS_HDMI) += hdmi4.o hdmi4_core.o
+omapdss-$(CONFIG_OMAP4_DSS_HDMI_CEC) += hdmi4_cec.o
 omapdss-$(CONFIG_OMAP5_DSS_HDMI) += hdmi5.o hdmi5_core.o
 ccflags-$(CONFIG_OMAP2_DSS_DEBUG) += -DDEBUG

drivers/gpu/drm/omapdrm/dss/hdmi4.c

@@ -36,9 +36,11 @@
 #include <linux/of.h>
 #include <linux/of_graph.h>
 #include <sound/omap-hdmi-audio.h>
+#include <media/cec.h>
 
 #include "omapdss.h"
 #include "hdmi4_core.h"
+#include "hdmi4_cec.h"
 #include "dss.h"
 #include "hdmi.h"
 
@@ -96,6 +98,13 @@ static irqreturn_t hdmi_irq_handler(int irq, void *data)
 	} else if (irqstatus & HDMI_IRQ_LINK_DISCONNECT) {
 		hdmi_wp_set_phy_pwr(wp, HDMI_PHYPWRCMD_LDOON);
 	}
+	if (irqstatus & HDMI_IRQ_CORE) {
+		u32 intr4 = hdmi_read_reg(hdmi->core.base, HDMI_CORE_SYS_INTR4);
+
+		hdmi_write_reg(hdmi->core.base, HDMI_CORE_SYS_INTR4, intr4);
+		if (intr4 & 8)
+			hdmi4_cec_irq(&hdmi->core);
+	}
 
 	return IRQ_HANDLED;
 }
@@ -392,6 +401,8 @@ static void hdmi_display_disable(struct omap_dss_device *dssdev)
 
 	DSSDBG("Enter hdmi_display_disable\n");
 
+	hdmi4_cec_set_phys_addr(&hdmi.core, CEC_PHYS_ADDR_INVALID);
+
 	mutex_lock(&hdmi.lock);
 
 	spin_lock_irqsave(&hdmi.audio_playing_lock, flags);
@@ -492,7 +503,11 @@ static int hdmi_read_edid(struct omap_dss_device *dssdev,
 	}
 
 	r = read_edid(edid, len);
-
+	if (r >= 256)
+		hdmi4_cec_set_phys_addr(&hdmi.core,
+					cec_get_edid_phys_addr(edid, r, NULL));
+	else
+		hdmi4_cec_set_phys_addr(&hdmi.core, CEC_PHYS_ADDR_INVALID);
 	if (need_enable)
 		hdmi4_core_disable(dssdev);
 
@@ -726,6 +741,10 @@ static int hdmi4_bind(struct device *dev, struct device *master, void *data)
 	if (r)
 		goto err;
 
+	r = hdmi4_cec_init(pdev, &hdmi.core, &hdmi.wp);
+	if (r)
+		goto err;
+
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0) {
 		DSSERR("platform_get_irq failed\n");
@@ -770,6 +789,8 @@ static void hdmi4_unbind(struct device *dev, struct device *master, void *data)
 
 	hdmi_uninit_output(pdev);
 
+	hdmi4_cec_uninit(&hdmi.core);
+
 	hdmi_pll_uninit(&hdmi.pll);
 
 	pm_runtime_disable(&pdev->dev);