bochs: add endian switching support
Recently (qemu 2.2+) the qemu stdvga got a register to switch the vga
framebuffer endianness. This patch adds code to explicitly set the
endianness of the framebuffer. In most cases this has no effect as
the default is guest architecture endianness. It is needed though in
case a architecture supports both big and little endian, i.e. for
ppc64le.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/bochs/bochs_hw.c b/drivers/gpu/drm/bochs/bochs_hw.c
index e8b1dacc..4603897 100644
--- a/drivers/gpu/drm/bochs/bochs_hw.c
+++ b/drivers/gpu/drm/bochs/bochs_hw.c
@@ -51,7 +51,7 @@
{
struct bochs_device *bochs = dev->dev_private;
struct pci_dev *pdev = dev->pdev;
- unsigned long addr, size, mem, ioaddr, iosize;
+ unsigned long addr, size, mem, ioaddr, iosize, qext_size;
u16 id;
if (pdev->resource[2].flags & IORESOURCE_MEM) {
@@ -115,6 +115,24 @@
size / 1024, addr,
bochs->ioports ? "ioports" : "mmio",
ioaddr);
+
+ if (bochs->mmio && pdev->revision >= 2) {
+ qext_size = readl(bochs->mmio + 0x600);
+ if (qext_size < 4 || qext_size > iosize)
+ goto noext;
+ DRM_DEBUG("Found qemu ext regs, size %ld\n", qext_size);
+ if (qext_size >= 8) {
+#ifdef __BIG_ENDIAN
+ writel(0xbebebebe, bochs->mmio + 0x604);
+#else
+ writel(0x1e1e1e1e, bochs->mmio + 0x604);
+#endif
+ DRM_DEBUG(" qext endian: 0x%x\n",
+ readl(bochs->mmio + 0x604));
+ }
+ }
+
+noext:
return 0;
}