From 67dbb4ea33731415fe09c62149a34f472719ac1d Mon Sep 17 00:00:00 2001
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: Tue, 27 Dec 2005 12:49:33 +1100
Subject: [PATCH] [PATCH] Fix more radeon GART start calculation cases
As reported by Jules Villard <jvillard@ens-lyon.fr> and some others, the
recent GART aperture start reconfiguration causes problems on some
setups.
What I _think_ might be happening is that the X server is also trying to
muck around with the card memory map and is forcing it back into a wrong
setting that also happens to no longer match what the DRM wants to do
and blows up. There are bugs all over the place in that code (and still
some bugs in the DRM as well anyway).
This patch attempts to avoid that by using the largest of the 2 values,
which I think will cause it to behave as it used to for you and will
still fix the problem with machines that have an aperture size smaller
than the video memory.
Acked-by: Jules Villard <jvillard@ens-lyon.fr>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
drivers/char/drm/radeon_cp.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/char/drm/radeon_cp.c b/drivers/char/drm/radeon_cp.c
index 501e557cbc868..b517ae515801b 100644
--- a/drivers/char/drm/radeon_cp.c
+++ b/drivers/char/drm/radeon_cp.c
@@ -1312,7 +1312,7 @@ static void radeon_set_pcigart(drm_radeon_private_t * dev_priv, int on)
static int radeon_do_init_cp(drm_device_t * dev, drm_radeon_init_t * init)
{
drm_radeon_private_t *dev_priv = dev->dev_private;
- unsigned int mem_size;
+ unsigned int mem_size, aper_size;
DRM_DEBUG("\n");
@@ -1527,7 +1527,9 @@ static int radeon_do_init_cp(drm_device_t * dev, drm_radeon_init_t * init)
mem_size = RADEON_READ(RADEON_CONFIG_MEMSIZE);
if (mem_size == 0)
mem_size = 0x800000;
- dev_priv->gart_vm_start = dev_priv->fb_location + mem_size;
+ aper_size = max(RADEON_READ(RADEON_CONFIG_APER_SIZE), mem_size);
+
+ dev_priv->gart_vm_start = dev_priv->fb_location + aper_size;
#if __OS_HAS_AGP
if (!dev_priv->is_pci)
--
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