From b7458b0915f9b0141defbb231250f069b85e796a Mon Sep 17 00:00:00 2001
From: Vijay Kumar Banerjee <vijaykumar9597@gmail.com>
Date: Sun, 4 Aug 2019 01:49:40 +0530
Subject: TDA19988: Import from FreeBSD

---
 freebsd/sys/dev/videomode/vesagtf.h | 86 +++++++++++++++++++++++++++++++++++++
 1 file changed, 86 insertions(+)
 create mode 100644 freebsd/sys/dev/videomode/vesagtf.h

(limited to 'freebsd/sys/dev/videomode/vesagtf.h')

diff --git a/freebsd/sys/dev/videomode/vesagtf.h b/freebsd/sys/dev/videomode/vesagtf.h
new file mode 100644
index 00000000..ea9dae40
--- /dev/null
+++ b/freebsd/sys/dev/videomode/vesagtf.h
@@ -0,0 +1,86 @@
+/*	$NetBSD$	*/
+/*	$FreeBSD$	*/
+
+/*-
+ * Copyright (c) 2006 Itronix Inc.
+ * All rights reserved.
+ *
+ * Written by Garrett D'Amore for Itronix Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of Itronix Inc. may not be used to endorse
+ *    or promote products derived from this software without specific
+ *    prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ITRONIX INC. ``AS IS'' AND ANY EXPRESS
+ * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL ITRONIX INC. BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
+ * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */ 
+
+#ifndef _DEV_VIDEOMODE_VESAGTF_H
+#define _DEV_VIDEOMODE_VESAGTF_H
+
+/*
+ * Use VESA GTF formula to generate a monitor mode, given resolution and
+ * refresh rates.
+ */
+
+struct vesagtf_params {
+	unsigned	margin_ppt;	/* vertical margin size, percent * 10
+					 * think parts-per-thousand */
+	unsigned	min_porch;	/* minimum front porch */
+	unsigned	vsync_rqd;	/* width of vsync in lines */
+	unsigned	hsync_pct;	/* hsync as % of total width */
+	unsigned	min_vsbp;	/* minimum vsync + back porch (usec) */
+	unsigned	M;		/* blanking formula gradient */
+	unsigned	C;		/* blanking formula offset */
+	unsigned	K;		/* blanking formula scaling factor */
+	unsigned	J;		/* blanking formula scaling factor */
+};
+
+/*
+ * Default values to use for params.
+ */
+#define	VESAGTF_MARGIN_PPT	18	/* 1.8% */
+#define	VESAGTF_MIN_PORCH	1	/* minimum front porch */
+#define	VESAGTF_VSYNC_RQD	3	/* vsync width in lines */
+#define	VESAGTF_HSYNC_PCT	8	/* width of hsync % of total line */
+#define	VESAGTF_MIN_VSBP	550	/* min vsync + back porch (usec) */
+#define	VESAGTF_M		600	/* blanking formula gradient */
+#define	VESAGTF_C		40	/* blanking formula offset */
+#define	VESAGTF_K		128	/* blanking formula scaling factor */
+#define	VESAGTF_J		20	/* blanking formula scaling factor */
+
+/*
+ * Use VESA GTF formula to generate monitor timings.  Assumes default
+ * GTF parameters, non-interlaced, and no margins.
+ */
+void vesagtf_mode(unsigned x, unsigned y, unsigned refresh,
+    struct videomode *);
+
+/*
+ * A more complete version, in case we ever want to use alternate GTF
+ * parameters.  EDID 1.3 allows for "secondary GTF parameters".
+ */
+void vesagtf_mode_params(unsigned x, unsigned y, unsigned refresh,
+    struct vesagtf_params *, int flags, struct videomode *);
+
+#define	VESAGTF_FLAG_ILACE	0x0001		/* use interlace */
+#define	VESAGTF_FLAG_MARGINS	0x0002		/* use margins */
+
+#endif /* _DEV_VIDEOMODE_VESAGTF_H */
-- 
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