From b7525d1ed83868beb382e31cad54e951ea270298 Mon Sep 17 00:00:00 2001
From: qwx <devnull@localhost>
Date: Mon, 4 Mar 2019 21:37:52 +0100
Subject: igfx: add support for 915gm

tested on a t43 with igfx and a 1600x1200 t43p screen
what works: lvds, blanking
what doesn't: hwgc (not visible), snarfing edid
untested: vga

based on realemu traces.
---
 sys/src/9/pc/vgaigfx.c     | 2 ++
 sys/src/cmd/aux/vga/igfx.c | 3 ++-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/sys/src/9/pc/vgaigfx.c b/sys/src/9/pc/vgaigfx.c
index ca31dade6..8702c29ee 100644
--- a/sys/src/9/pc/vgaigfx.c
+++ b/sys/src/9/pc/vgaigfx.c
@@ -66,6 +66,7 @@ igfxblank(VGAscr *scr, int blank)
 
 	case 0x2a02:	/* GM965 */
 	case 0x2a42:	/* GM45 */
+	case 0x2592:	/* GM915 */
 		off = 0x61204;
 		break;
 
@@ -156,6 +157,7 @@ igfxcurregs(VGAscr* scr, int pipe)
 		if(pipe > 2)
 			return nil;
 		break;
+	case 0x2592:	/* GM915 */
 	case 0x2a42:	/* X200 */
 	case 0x29a2:	/* 82P965/G965 HECI desktop */
 	case 0x2a02:	/* CF-R7 */
diff --git a/sys/src/cmd/aux/vga/igfx.c b/sys/src/cmd/aux/vga/igfx.c
index 3d7841a36..c636706b0 100644
--- a/sys/src/cmd/aux/vga/igfx.c
+++ b/sys/src/cmd/aux/vga/igfx.c
@@ -379,6 +379,7 @@ devtype(Igfx *igfx)
 	case 0x29a2:	/* 82P965/G965 HECI desktop */
 	case 0x2a02:	/* GM965/GL960/X3100 - ThinkPad X61 Tablet */
 	case 0x2a42:	/* 4 Series Mobile - ThinkPad X200 */
+	case 0x2592:	/* 915GM */
 		return TypeG45;
 	}
 	return -1;
@@ -889,7 +890,7 @@ initdpll(Igfx *igfx, int x, int freq, int port)
 	dpll->ctrl.v |=  0x010000<<(p1-1);
 
 	/* FP1 P1 Post divisor */
-	if(igfx->pci->did != 0x27a2){
+	if(igfx->pci->did != 0x27a2 && igfx->pci->did != 0x2592){
 		dpll->ctrl.v &= ~0xFF;
 		dpll->ctrl.v |=  0x01<<(p1-1);
 		dpll->fp1.v = dpll->fp0.v;
-- 
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