This is a note to let you know that I've just added the patch titled
drm/radeon/kms: fix for radeon on systems >4GB without
to the 2.6.33-longterm tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/longterm/longterm-queue-2.6.33.git;a=summary
The filename of the patch is:
drm-radeon-kms-fix-for-radeon-on-systems-4gb-without.patch
and it can be found in the queue-2.6.33 subdirectory.
If you, or anyone else, feels it should not be added to the 2.6.33 longterm
tree,
please let <[email protected]> know about it.
>From 62fff811d73095bd95579d72f558f03c78f7914a Mon Sep 17 00:00:00 2001
From: Daniel Haid <[email protected]>
Date: Wed, 8 Jun 2011 20:04:45 +1000
Subject: drm/radeon/kms: fix for radeon on systems >4GB without
hardware iommu
From: Daniel Haid <[email protected]>
commit 62fff811d73095bd95579d72f558f03c78f7914a upstream.
On my x86_64 system with >4GB of ram and swiotlb instead of
a hardware iommu (because I have a VIA chipset), the call
to pci_set_dma_mask (see below) with 40bits returns an error.
But it seems that the radeon driver is designed to have
need_dma32 = true exactly if pci_set_dma_mask is called
with 32 bits and false if it is called with 40 bits.
I have read somewhere that the default are 32 bits. So if the
call fails I suppose that need_dma32 should be set to true.
And indeed the patch fixes the problem I have had before
and which I had described here:
http://choon.net/forum/read.php?21,106131,115940
Acked-by: Alex Deucher <[email protected]>
Signed-off-by: Dave Airlie <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/gpu/drm/radeon/radeon_device.c | 1 +
1 file changed, 1 insertion(+)
--- a/drivers/gpu/drm/radeon/radeon_device.c
+++ b/drivers/gpu/drm/radeon/radeon_device.c
@@ -682,6 +682,7 @@ int radeon_device_init(struct radeon_dev
dma_bits = rdev->need_dma32 ? 32 : 40;
r = pci_set_dma_mask(rdev->pdev, DMA_BIT_MASK(dma_bits));
if (r) {
+ rdev->need_dma32 = true;
printk(KERN_WARNING "radeon: No suitable DMA available.\n");
}
Patches currently in longterm-queue-2.6.33 which might be from [email protected]
are
/home/gregkh/linux/longterm/longterm-queue-2.6.33/queue-2.6.33/drm-radeon-kms-fix-for-radeon-on-systems-4gb-without.patch
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