From 759593ffa7e05ebea9b21135cad179982331f5d8 Mon Sep 17 00:00:00 2001
From: Tomi Valkeinen <tomi.valkeinen@ti.com>
Date: Mon, 29 Aug 2011 18:10:20 +0300
Subject: [PATCH] OMAP: DSS2: HDMI: implement detect()

Implement detect() by checking the hot plug detect status.

The implementation is not very good, as it always turns on the HDMI
output to get the detection working. HDMI driver needs improvements so
that we could enable only core parts of it.

Cc: Mythri P K <mythripk@ti.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
---
 drivers/video/omap2/dss/dss.h             |  1 +
 drivers/video/omap2/dss/dss_features.c    |  1 +
 drivers/video/omap2/dss/hdmi.c            | 17 +++++++++++++++
 drivers/video/omap2/dss/hdmi_panel.c      | 25 +++++++++++++++++++++++
 drivers/video/omap2/dss/ti_hdmi.h         |  3 +++
 drivers/video/omap2/dss/ti_hdmi_4xxx_ip.c | 12 +++++++++++
 6 files changed, 59 insertions(+)

diff --git a/drivers/video/omap2/dss/dss.h b/drivers/video/omap2/dss/dss.h
index 2e7799c8296..f58c302b730 100644
--- a/drivers/video/omap2/dss/dss.h
+++ b/drivers/video/omap2/dss/dss.h
@@ -495,6 +495,7 @@ void omapdss_hdmi_display_set_timing(struct omap_dss_device *dssdev);
 int omapdss_hdmi_display_check_timing(struct omap_dss_device *dssdev,
 					struct omap_video_timings *timings);
 int omapdss_hdmi_read_edid(u8 *buf, int len);
+bool omapdss_hdmi_detect(void);
 int hdmi_panel_init(void);
 void hdmi_panel_exit(void);
 
diff --git a/drivers/video/omap2/dss/dss_features.c b/drivers/video/omap2/dss/dss_features.c
index 076f399a915..ab4166590a7 100644
--- a/drivers/video/omap2/dss/dss_features.c
+++ b/drivers/video/omap2/dss/dss_features.c
@@ -440,6 +440,7 @@ static const struct ti_hdmi_ip_ops omap4_hdmi_functions = {
 	.phy_enable		=	ti_hdmi_4xxx_phy_enable,
 	.phy_disable		=	ti_hdmi_4xxx_phy_disable,
 	.read_edid		=	ti_hdmi_4xxx_read_edid,
+	.detect			=	ti_hdmi_4xxx_detect,
 	.pll_enable		=	ti_hdmi_4xxx_pll_enable,
 	.pll_disable		=	ti_hdmi_4xxx_pll_disable,
 	.video_enable		=	ti_hdmi_4xxx_wp_video_start,
diff --git a/drivers/video/omap2/dss/hdmi.c b/drivers/video/omap2/dss/hdmi.c
index fb85ce5a8ab..78186700266 100644
--- a/drivers/video/omap2/dss/hdmi.c
+++ b/drivers/video/omap2/dss/hdmi.c
@@ -449,6 +449,23 @@ int omapdss_hdmi_read_edid(u8 *buf, int len)
 	return r;
 }
 
+bool omapdss_hdmi_detect(void)
+{
+	int r;
+
+	mutex_lock(&hdmi.lock);
+
+	r = hdmi_runtime_get();
+	BUG_ON(r);
+
+	r = hdmi.ip_data.ops->detect(&hdmi.ip_data);
+
+	hdmi_runtime_put();
+	mutex_unlock(&hdmi.lock);
+
+	return r == 1;
+}
+
 int omapdss_hdmi_display_enable(struct omap_dss_device *dssdev)
 {
 	int r = 0;
diff --git a/drivers/video/omap2/dss/hdmi_panel.c b/drivers/video/omap2/dss/hdmi_panel.c
index 71aa8134f4f..533d5dc634d 100644
--- a/drivers/video/omap2/dss/hdmi_panel.c
+++ b/drivers/video/omap2/dss/hdmi_panel.c
@@ -25,6 +25,7 @@
 #include <linux/mutex.h>
 #include <linux/module.h>
 #include <video/omapdss.h>
+#include <linux/slab.h>
 
 #include "dss.h"
 
@@ -198,6 +199,29 @@ err:
 	return r;
 }
 
+static bool hdmi_detect(struct omap_dss_device *dssdev)
+{
+	int r;
+
+	mutex_lock(&hdmi.hdmi_lock);
+
+	if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE) {
+		r = omapdss_hdmi_display_enable(dssdev);
+		if (r)
+			goto err;
+	}
+
+	r = omapdss_hdmi_detect();
+
+	if (dssdev->state == OMAP_DSS_DISPLAY_DISABLED ||
+			dssdev->state == OMAP_DSS_DISPLAY_SUSPENDED)
+		omapdss_hdmi_display_disable(dssdev);
+err:
+	mutex_unlock(&hdmi.hdmi_lock);
+
+	return r;
+}
+
 static struct omap_dss_driver hdmi_driver = {
 	.probe		= hdmi_panel_probe,
 	.remove		= hdmi_panel_remove,
@@ -209,6 +233,7 @@ static struct omap_dss_driver hdmi_driver = {
 	.set_timings	= hdmi_set_timings,
 	.check_timings	= hdmi_check_timings,
 	.read_edid	= hdmi_read_edid,
+	.detect		= hdmi_detect,
 	.driver			= {
 		.name   = "hdmi_panel",
 		.owner  = THIS_MODULE,
diff --git a/drivers/video/omap2/dss/ti_hdmi.h b/drivers/video/omap2/dss/ti_hdmi.h
index 390cd85b122..d48603c8e23 100644
--- a/drivers/video/omap2/dss/ti_hdmi.h
+++ b/drivers/video/omap2/dss/ti_hdmi.h
@@ -94,6 +94,8 @@ struct ti_hdmi_ip_ops {
 
 	int (*read_edid)(struct hdmi_ip_data *ip_data, u8 *edid, int len);
 
+	bool (*detect)(struct hdmi_ip_data *ip_data);
+
 	int (*pll_enable)(struct hdmi_ip_data *ip_data);
 
 	void (*pll_disable)(struct hdmi_ip_data *ip_data);
@@ -114,6 +116,7 @@ struct hdmi_ip_data {
 int ti_hdmi_4xxx_phy_enable(struct hdmi_ip_data *ip_data);
 void ti_hdmi_4xxx_phy_disable(struct hdmi_ip_data *ip_data);
 int ti_hdmi_4xxx_read_edid(struct hdmi_ip_data *ip_data, u8 *edid, int len);
+bool ti_hdmi_4xxx_detect(struct hdmi_ip_data *ip_data);
 void ti_hdmi_4xxx_wp_video_start(struct hdmi_ip_data *ip_data, bool start);
 int ti_hdmi_4xxx_pll_enable(struct hdmi_ip_data *ip_data);
 void ti_hdmi_4xxx_pll_disable(struct hdmi_ip_data *ip_data);
diff --git a/drivers/video/omap2/dss/ti_hdmi_4xxx_ip.c b/drivers/video/omap2/dss/ti_hdmi_4xxx_ip.c
index e9885dcc412..da7fe50fc12 100644
--- a/drivers/video/omap2/dss/ti_hdmi_4xxx_ip.c
+++ b/drivers/video/omap2/dss/ti_hdmi_4xxx_ip.c
@@ -416,6 +416,18 @@ int ti_hdmi_4xxx_read_edid(struct hdmi_ip_data *ip_data,
 	return l;
 }
 
+bool ti_hdmi_4xxx_detect(struct hdmi_ip_data *ip_data)
+{
+	int r;
+
+	void __iomem *base = hdmi_core_sys_base(ip_data);
+
+	/* HPD */
+	r = REG_GET(base, HDMI_CORE_SYS_SYS_STAT, 1, 1);
+
+	return r == 1;
+}
+
 static void hdmi_core_init(struct hdmi_core_video_config *video_cfg,
 			struct hdmi_core_infoframe_avi *avi_cfg,
 			struct hdmi_core_packet_enable_repeat *repeat_cfg)
-- 
2.41.0