OMAP4: DSS2: HDMI: HDMI panel driver addition in the DSS

The panel driver(hdmi_omap4_panel.c) in omap2/dss acts as a controller
to manage the enable and disable requests and synchronize audio and video.
Signed-off-by: Mythri P K <mythripk@ti.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/video/omap2/dss/dss.h

@@ -477,6 +477,8 @@ void omapdss_hdmi_display_disable(struct omap_dss_device *dssdev);
 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 hdmi_panel_init(void);
+void hdmi_panel_exit(void);
 
 /* RFBI */
 #ifdef CONFIG_OMAP2_DSS_RFBI

drivers/video/omap2/dss/hdmi_omap4_panel.c

+/*
+ * hdmi_omap4_panel.c
+ *
+ * HDMI library support functions for TI OMAP4 processors.
+ *
+ * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com/
+ * Authors:	Mythri P k <mythripk@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/mutex.h>
+#include <linux/module.h>
+#include <plat/display.h>
+
+#include "dss.h"
+
+static struct {
+	struct mutex hdmi_lock;
+} hdmi;
+
+
+static int hdmi_panel_probe(struct omap_dss_device *dssdev)
+{
+	DSSDBG("ENTER hdmi_panel_probe\n");
+
+	dssdev->panel.config = OMAP_DSS_LCD_TFT |
+			OMAP_DSS_LCD_IVS | OMAP_DSS_LCD_IHS;
+
+	/*
+	 * Initialize the timings to 640 * 480
+	 * This is only for framebuffer update not for TV timing setting
+	 * Setting TV timing will be done only on enable
+	 */
+	dssdev->panel.timings.x_res = 640;
+	dssdev->panel.timings.y_res = 480;
+
+	DSSDBG("hdmi_panel_probe x_res= %d y_res = %d\n",
+		dssdev->panel.timings.x_res,
+		dssdev->panel.timings.y_res);
+	return 0;
+}
+
+static void hdmi_panel_remove(struct omap_dss_device *dssdev)
+{
+
+}
+
+static int hdmi_panel_enable(struct omap_dss_device *dssdev)
+{
+	int r = 0;
+	DSSDBG("ENTER hdmi_panel_enable\n");
+
+	mutex_lock(&hdmi.hdmi_lock);
+
+	if (dssdev->state != OMAP_DSS_DISPLAY_DISABLED) {
+		r = -EINVAL;
+		goto err;
+	}
+
+	r = omapdss_hdmi_display_enable(dssdev);
+	if (r) {
+		DSSERR("failed to power on\n");
+		goto err;
+	}
+
+	dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
+
+err:
+	mutex_unlock(&hdmi.hdmi_lock);
+
+	return r;
+}
+
+static void hdmi_panel_disable(struct omap_dss_device *dssdev)
+{
+	mutex_lock(&hdmi.hdmi_lock);
+
+	if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
+		omapdss_hdmi_display_disable(dssdev);
+
+	dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
+
+	mutex_unlock(&hdmi.hdmi_lock);
+}
+
+static int hdmi_panel_suspend(struct omap_dss_device *dssdev)
+{
+	int r = 0;
+
+	mutex_lock(&hdmi.hdmi_lock);
+
+	if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE) {
+		r = -EINVAL;
+		goto err;
+	}
+
+	dssdev->state = OMAP_DSS_DISPLAY_SUSPENDED;
+
+	omapdss_hdmi_display_disable(dssdev);
+
+err:
+	mutex_unlock(&hdmi.hdmi_lock);
+
+	return r;
+}
+
+static int hdmi_panel_resume(struct omap_dss_device *dssdev)
+{
+	int r = 0;
+
+	mutex_lock(&hdmi.hdmi_lock);
+
+	if (dssdev->state != OMAP_DSS_DISPLAY_SUSPENDED) {
+		r = -EINVAL;
+		goto err;
+	}
+
+	r = omapdss_hdmi_display_enable(dssdev);
+	if (r) {
+		DSSERR("failed to power on\n");
+		goto err;
+	}
+
+	dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
+
+err:
+	mutex_unlock(&hdmi.hdmi_lock);
+
+	return r;
+}
+
+static void hdmi_get_timings(struct omap_dss_device *dssdev,
+			struct omap_video_timings *timings)
+{
+	mutex_lock(&hdmi.hdmi_lock);
+
+	*timings = dssdev->panel.timings;
+
+	mutex_unlock(&hdmi.hdmi_lock);
+}
+
+static void hdmi_set_timings(struct omap_dss_device *dssdev,
+			struct omap_video_timings *timings)
+{
+	DSSDBG("hdmi_set_timings\n");
+
+	mutex_lock(&hdmi.hdmi_lock);
+
+	dssdev->panel.timings = *timings;
+
+	if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE) {
+		/* turn the hdmi off and on to get new timings to use */
+		omapdss_hdmi_display_disable(dssdev);
+		omapdss_hdmi_display_set_timing(dssdev);
+	}
+
+	mutex_unlock(&hdmi.hdmi_lock);
+}
+
+static int hdmi_check_timings(struct omap_dss_device *dssdev,
+			struct omap_video_timings *timings)
+{
+	int r = 0;
+
+	DSSDBG("hdmi_check_timings\n");
+
+	mutex_lock(&hdmi.hdmi_lock);
+
+	r = omapdss_hdmi_display_check_timing(dssdev, timings);
+	if (r) {
+		DSSERR("Timing cannot be applied\n");
+		goto err;
+	}
+err:
+	mutex_unlock(&hdmi.hdmi_lock);
+	return r;
+}
+
+static struct omap_dss_driver hdmi_driver = {
+	.probe		= hdmi_panel_probe,
+	.remove		= hdmi_panel_remove,
+	.enable		= hdmi_panel_enable,
+	.disable	= hdmi_panel_disable,
+	.suspend	= hdmi_panel_suspend,
+	.resume		= hdmi_panel_resume,
+	.get_timings	= hdmi_get_timings,
+	.set_timings	= hdmi_set_timings,
+	.check_timings	= hdmi_check_timings,
+	.driver			= {
+		.name   = "hdmi_panel",
+		.owner  = THIS_MODULE,
+	},
+};
+
+int hdmi_panel_init(void)
+{
+	mutex_init(&hdmi.hdmi_lock);
+
+	omap_dss_register_driver(&hdmi_driver);
+
+	return 0;
+}
+
+void hdmi_panel_exit(void)
+{
+	omap_dss_unregister_driver(&hdmi_driver);
+
+}