From 317806623e7ddaeebcd946a1358bd4869032d8fd Mon Sep 17 00:00:00 2001
From: Rudolf Cornelissen <rudolf.cornelissen@gmail.com>
Date: Tue, 22 Nov 2005 21:12:13 +0000
Subject: [PATCH] Added MMS (multihead cards) support by using primary adaptors
 BIOS for all cards. Confirmed a G200MMS working OK on all four heads with the
 Be test harness application. That's one card with four G200 GPU's on it!
 (thanks Cale Lewis :)

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15081 a95241bf-73f2-0310-859d-f6bbb57e9c96
---
 .../drivers/graphics/matrox/UPDATE.html       |  5 ++-
 .../kernel/drivers/graphics/matrox/driver.c   | 45 ++++++++++++++++---
 2 files changed, 43 insertions(+), 7 deletions(-)
diff --git a/src/add-ons/kernel/drivers/graphics/matrox/UPDATE.html b/src/add-ons/kernel/drivers/graphics/matrox/UPDATE.html
index 1cdcdcf6d1..a27bd7dae0 100644
--- a/src/add-ons/kernel/drivers/graphics/matrox/UPDATE.html
+++ b/src/add-ons/kernel/drivers/graphics/matrox/UPDATE.html
@@ -4,9 +4,10 @@
 </head>
 <body>
 <p><h2>Changes done for each driverversion:</h2></p>
-<p><h1>head (SVN 0.22, Rudolf)</h1></p>
+<p><h1>head (SVN 0.23, Rudolf)</h1></p>
 <ul>
-<li>Several ProposeMode updates and fixes making the Matrox driver better compatible with Dualhead Setup 0.04.
+<li>Several ProposeMode updates and fixes making the Matrox driver better compatible with Dualhead Setup 0.04;
+<li>Added support for MMS cards by letting non-primary adaptors use the BIOS from the primary adaptor if they don't have their own. Confirmed a G200MMS working OK on all four heads using the 'test harness' application from Be's R4 graphics driver kit. A big thanks to Cale Lewis for donating this card!
 </ul>
 <p><h1>mga_driver 0.20 (Rudolf)</h1></p>
 <ul>
diff --git a/src/add-ons/kernel/drivers/graphics/matrox/driver.c b/src/add-ons/kernel/drivers/graphics/matrox/driver.c
index f8ad74dbb2..e6befc4fa9 100644
--- a/src/add-ons/kernel/drivers/graphics/matrox/driver.c
+++ b/src/add-ons/kernel/drivers/graphics/matrox/driver.c
@@ -4,7 +4,7 @@
 
 	Other authors:
 	Mark Watson;
-	Rudolf Cornelissen 3/2002-11/2003.
+	Rudolf Cornelissen 3/2002-11/2005.
 */
 
 /* standard kernel driver stuff */
@@ -304,7 +304,7 @@ static status_t map_device(device_info *di)
 //	#define G400_DMA_BUFFER_SIZE 1024*1024
 
 	/*variables for making copy of ROM*/
-	char * rom_temp;
+	uint8 *rom_temp;
 	area_id rom_area;
 
 	/* MIL1 has frame_buffer in [1], control_regs in [0], and nothing in [2], while
@@ -382,9 +382,44 @@ static status_t map_device(device_info *di)
 		return rom_area;
 	}
 
-	/* make a copy of ROM for future reference*/
-	memcpy (si->rom_mirror, rom_temp, 32768);
-	if (current_settings.dumprom) dumprom (rom_temp, 32768);
+	/* if we have a MMS card which only has a BIOS on the primary card, copy the
+	 * primary card's BIOS for our reference too if we aren't primary ourselves.
+	 * (confirmed OK on 'quad' G200MMS.) */
+	if ((di->pcii.class_base == PCI_display) &&
+		(di->pcii.class_sub == PCI_display_other) &&
+		((rom_temp[0] != 0x55) || (rom_temp[1] != 0xaa)) && di->pcii.device)
+	{
+		/* locate the main VGA adaptor on our bus, should sit on device #0
+		 * (MMS cards have a own bridge: so there are only graphics cards on it's bus). */
+		uint8 index = 0;
+		bool found = false;
+		for (index = 0; index < pd->count; index++)
+		{
+			if ((pd->di[index].pcii.bus == di->pcii.bus) &&
+				(pd->di[index].pcii.device == 0x00))
+			{
+				found = true;
+				break;
+			}
+		}
+		if (found)
+		{
+			/* make the copy from the primary VGA card */
+			memcpy (si->rom_mirror, pd->di[index].si->rom_mirror, 32768);
+		}
+		else
+		{
+			/* make a copy of 'non-ok' ROM area for future reference just in case */
+			memcpy (si->rom_mirror, rom_temp, 32768);
+		}
+	}
+	else
+	{
+		/* make a copy of ROM for future reference */
+		memcpy (si->rom_mirror, rom_temp, 32768);
+	}
+
+	if (current_settings.dumprom) dumprom (si->rom_mirror, 32768);
 
 	/*disable ROM and delete the area*/
 	set_pci(PCI_rom_base,4,0);
