From aca900831c8edd712a68b8c37171bda4fe7152e1 Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexdeucher@gmail.com>
Date: Fri, 2 Oct 2009 17:36:41 -0400
Subject: [PATCH] --- yaml --- r: 167043 b: refs/heads/master c:
 b442962a9e826e6d408886b3e52c88b774201983 h: refs/heads/master i:   167041:
 3311a1a37e4bc815cb2114f5c652b6cb0edb650a   167039:
 114e73836925bf884a1b74cc678ccbf0dc1598e9 v: v3

---
 [refs]                                     |  2 +-
 trunk/drivers/gpu/drm/radeon/radeon_bios.c | 49 +++++++++++++++++++++-
 2 files changed, 48 insertions(+), 3 deletions(-)

diff --git a/[refs] b/[refs]
index e65a8cfc00d0..40f40d17870a 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: ac447df4f2283a116a3fbbc28cbaabf05758b736
+refs/heads/master: b442962a9e826e6d408886b3e52c88b774201983
diff --git a/trunk/drivers/gpu/drm/radeon/radeon_bios.c b/trunk/drivers/gpu/drm/radeon/radeon_bios.c
index 96e37a6e7ce4..34a9b9119518 100644
--- a/trunk/drivers/gpu/drm/radeon/radeon_bios.c
+++ b/trunk/drivers/gpu/drm/radeon/radeon_bios.c
@@ -33,12 +33,50 @@
 /*
  * BIOS.
  */
+
+/* If you boot an IGP board with a discrete card as the primary,
+ * the IGP rom is not accessible via the rom bar as the IGP rom is
+ * part of the system bios.  On boot, the system bios puts a
+ * copy of the igp rom at the start of vram if a discrete card is
+ * present.
+ */
+static bool igp_read_bios_from_vram(struct radeon_device *rdev)
+{
+	uint8_t __iomem *bios;
+	resource_size_t vram_base;
+	resource_size_t size = 256 * 1024; /* ??? */
+
+	rdev->bios = NULL;
+	vram_base = drm_get_resource_start(rdev->ddev, 0);
+	bios = ioremap(vram_base, size);
+	if (!bios) {
+		DRM_ERROR("Unable to mmap vram\n");
+		return false;
+	}
+
+	if (size == 0 || bios[0] != 0x55 || bios[1] != 0xaa) {
+		iounmap(bios);
+		DRM_ERROR("bad rom signature\n");
+		return false;
+	}
+	rdev->bios = kmalloc(size, GFP_KERNEL);
+	if (rdev->bios == NULL) {
+		iounmap(bios);
+		DRM_ERROR("kmalloc failed\n");
+		return false;
+	}
+	memcpy(rdev->bios, bios, size);
+	iounmap(bios);
+	return true;
+}
+
 static bool radeon_read_bios(struct radeon_device *rdev)
 {
 	uint8_t __iomem *bios;
 	size_t size;
 
 	rdev->bios = NULL;
+	/* XXX: some cards may return 0 for rom size? ddx has a workaround */
 	bios = pci_map_rom(rdev->pdev, &size);
 	if (!bios) {
 		return false;
@@ -341,7 +379,9 @@ static bool legacy_read_disabled_bios(struct radeon_device *rdev)
 
 static bool radeon_read_disabled_bios(struct radeon_device *rdev)
 {
-	if (rdev->family >= CHIP_RV770)
+	if (rdev->flags & RADEON_IS_IGP)
+		return igp_read_bios_from_vram(rdev);
+	else if (rdev->family >= CHIP_RV770)
 		return r700_read_disabled_bios(rdev);
 	else if (rdev->family >= CHIP_R600)
 		return r600_read_disabled_bios(rdev);
@@ -356,7 +396,12 @@ bool radeon_get_bios(struct radeon_device *rdev)
 	bool r;
 	uint16_t tmp;
 
-	r = radeon_read_bios(rdev);
+	if (rdev->flags & RADEON_IS_IGP) {
+		r = igp_read_bios_from_vram(rdev);
+		if (r == false)
+			r = radeon_read_bios(rdev);
+	} else
+		r = radeon_read_bios(rdev);
 	if (r == false) {
 		r = radeon_read_disabled_bios(rdev);
 	}