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    Subject[PATCH 4.14 070/140] drm/radeon: insist on 32-bit DMA for Cedar on PPC64/PPC64LE
    Date
    4.14-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Ben Crocker <bcrocker@redhat.com>

    commit 2c83029cda55a5e7665c7c6326909427d6a01350 upstream.

    In radeon_device_init, set the need_dma32 flag for Cedar chips
    (e.g. FirePro 2270). This fixes, or at least works around, a bug
    on PowerPC exposed by last year's commits

    8e3f1b1d8255105f31556aacf8aeb6071b00d469 (Russell Currey)

    and

    253fd51e2f533552ae35a0c661705da6c4842c1b (Alistair Popple)

    which enabled the 64-bit DMA iommu bypass.

    This caused the device to freeze, in some cases unrecoverably, and is
    the subject of several bug reports internal to Red Hat.

    Signed-off-by: Ben Crocker <bcrocker@redhat.com>
    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
    Cc: stable@vger.kernel.org
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/gpu/drm/radeon/radeon_device.c | 4 ++++
    1 file changed, 4 insertions(+)

    --- a/drivers/gpu/drm/radeon/radeon_device.c
    +++ b/drivers/gpu/drm/radeon/radeon_device.c
    @@ -1397,6 +1397,10 @@ int radeon_device_init(struct radeon_dev
    if ((rdev->flags & RADEON_IS_PCI) &&
    (rdev->family <= CHIP_RS740))
    rdev->need_dma32 = true;
    +#ifdef CONFIG_PPC64
    + if (rdev->family == CHIP_CEDAR)
    + rdev->need_dma32 = true;
    +#endif

    dma_bits = rdev->need_dma32 ? 32 : 40;
    r = pci_set_dma_mask(rdev->pdev, DMA_BIT_MASK(dma_bits));

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