gma500: Mask out bits not part of the page table base address

[Patrik Jakobsson]

Otherwise we can't ioremap the gtt and the screen gets garbled.

Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@xxxxxxxxx>
---

diff --git a/drivers/staging/gma500/gtt.c b/drivers/staging/gma500/gtt.c
index 28f2261..78dd01b 100644
--- a/drivers/staging/gma500/gtt.c
+++ b/drivers/staging/gma500/gtt.c
@@ -397,7 +397,7 @@ int psb_gtt_init(struct drm_device *dev, int resume)
 	/* The root resource we allocate address space from */
 	dev_priv->gtt_initialized = 1;
 
-	pg->gtt_phys_start = dev_priv->pge_ctl;
+	pg->gtt_phys_start = dev_priv->pge_ctl & PAGE_MASK;
 	
 	/*
 	 *	FIXME: video mmu has hw bug to access 0x0D0000000,
--
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