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    Subject[38/89] drm/radeon/kms: fix for radeon on systems >4GB without
    2.6.39-stable review patch.  If anyone has any objections, please let us know.

    hardware iommu

    From: Daniel Haid <>

    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:,106131,115940

    Acked-by: Alex Deucher <>
    Signed-off-by: Dave Airlie <>
    Signed-off-by: Greg Kroah-Hartman <>

    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
    @@ -752,6 +752,7 @@ 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");

     \ /
      Last update: 2011-06-16 09:03    [W:0.020 / U:2.008 seconds]
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