[Bug 96473] i915.ko corrupt text lines at top, [drm] GPU HANG: ecode 2:0:0x037fffc1, reason: Ring hung

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96473

--- Comment #13 from Taketo Kabe <fdporg at vega.pgw.jp> ---
Temporal solution: do what kernel 3.18.x does:
don't try to determine stolen area and return zero on 865G.
This works (no text corruption, no GPU HANG), but
essentially this is same as Comment 9 test, and 
obviously isn't going in right direction.
(is reserved memory usable for /dev/fb0 in 82865G?)

diff -U 6 -p ./drivers/gpu/drm/i915/i915_gem_stolen.c.ville
./drivers/gpu/drm/i915/i915_gem_stolen.c
--- ./drivers/gpu/drm/i915/i915_gem_stolen.c.ville      2016-06-08
10:23:53.000000000 +0900
+++ ./drivers/gpu/drm/i915/i915_gem_stolen.c    2016-06-13 14:10:55.000000000
+0900
@@ -105,23 +105,26 @@ static unsigned long i915_stolen_to_phys
        base = 0;
        if (INTEL_INFO(dev)->gen >= 3) {
                /* Read Graphics Base of Stolen Memory directly */
                pci_read_config_dword(dev->pdev, 0x5c, &base);
                base &= ~((1<<20) - 1);
        } else if (IS_I865G(dev)) {
+#if 0 /* as kernel 3.14 */
                u16 toud = 0;

                /*
                 * FIXME is the graphics stolen memory region
                 * always at TOUD? Ie. is it always the last
                 * one to be allocated by the BIOS?
                 */
                pci_bus_read_config_word(dev->pdev->bus, PCI_DEVFN(0, 0),
                                         I865_TOUD, &toud);

                base = toud << 16;
+#endif
+       /*DDD*/DRM_INFO("i915_stolen_to_physical: i865 base = 0x%x\n", base);
        } else if (IS_I85X(dev)) {
                u32 tseg_size = 0;
                u32 tom;
                u8 tmp;

                pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),

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