Re: [PATCH] drm/i915: Disable stolen on 865G

On Thu, Aug 04, 2016 at 06:31:21PM +0200, Daniel Vetter wrote:

On Thu, Aug 04, 2016 at 10:56:04AM +0100, Chris Wilson wrote:

quoted

It appears our calculation for the address of stolen memory is incorrect
for 865G, so for the time being disable our use of that memory.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=96473
Fixes: 0ad98c74e093 ("drm/i915: Deatermine the stolen memory base address...")
Signed-off-by: Chris Wilson <redacted>
Cc: Ville Syrj�l� <redacted>
Cc: Daniel Vetter <redacted>
Cc: stable@vger.kernel.org

Acked-by: Daniel Vetter <redacted>

There's a potentially better patch (one that actually fixes the stolen
base calculation) attached to the bug.

quoted

---
 drivers/gpu/drm/i915/i915_gem_stolen.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c b/drivers/gpu/drm/i915/i915_gem_stolen.c
index e1791fe96674..8b501ddbc784 100644
--- a/drivers/gpu/drm/i915/i915_gem_stolen.c
+++ b/drivers/gpu/drm/i915/i915_gem_stolen.c

@@ -122,6 +122,7 @@ static unsigned long i915_stolen_to_physical(struct drm_device *dev)
 		 * always at TOUD? Ie. is it always the last
 		 * one to be allocated by the BIOS?
 		 */
+		if (0) /* https://bugs.freedesktop.org/show_bug.cgi?id=96473 */
 		pci_bus_read_config_word(dev->pdev->bus, PCI_DEVFN(0, 0),
 					 I865_TOUD, &toud);
 

-- 
2.8.1

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

-- 
Ville Syrj�l�
Intel OTC