This change breaks tons of systems.

This reverts commit 33b3ad3788aba846fc8b9a065fe2685a0b64f713.

Bug: https://bugzilla.kernel.org/show_bug.cgi?id=206973 Bug: https://bugzilla.kernel.org/show_bug.cgi?id=206697 Bug: https://bugzilla.kernel.org/show_bug.cgi?id=207763 Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1140 Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1287 Signed-off-by: Alex Deucher alexander.deucher@amd.com Cc: stable@vger.kernel.org Cc: Christoph Hellwig hch@lst.de Cc: christian.koenig@amd.com --- drivers/gpu/drm/radeon/radeon.h | 1 + drivers/gpu/drm/radeon/radeon_device.c | 13 ++++++++----- drivers/gpu/drm/radeon/radeon_ttm.c | 2 +- 3 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h index b7c3fb2bfb54..eed23dffccf4 100644 --- a/drivers/gpu/drm/radeon/radeon.h +++ b/drivers/gpu/drm/radeon/radeon.h @@ -2391,6 +2391,7 @@ struct radeon_device { struct radeon_wb wb; struct radeon_dummy_page dummy_page; bool shutdown; + bool need_dma32; bool need_swiotlb; bool accel_working; bool fastfb_working; /* IGP feature*/ diff --git a/drivers/gpu/drm/radeon/radeon_device.c b/drivers/gpu/drm/radeon/radeon_device.c index 266e3cbbd09b..f74c74ad8b5d 100644 --- a/drivers/gpu/drm/radeon/radeon_device.c +++ b/drivers/gpu/drm/radeon/radeon_device.c @@ -1363,25 +1363,28 @@ int radeon_device_init(struct radeon_device *rdev, else rdev->mc.mc_mask = 0xffffffffULL; /* 32 bit MC */

- /* set DMA mask. + /* set DMA mask + need_dma32 flags. * PCIE - can handle 40-bits. * IGP - can handle 40-bits * AGP - generally dma32 is safest * PCI - dma32 for legacy pci gart, 40 bits on newer asics */ - dma_bits = 40; + rdev->need_dma32 = false; if (rdev->flags & RADEON_IS_AGP) - dma_bits = 32; + rdev->need_dma32 = true; if ((rdev->flags & RADEON_IS_PCI) && (rdev->family <= CHIP_RS740)) - dma_bits = 32; + rdev->need_dma32 = true; #ifdef CONFIG_PPC64 if (rdev->family == CHIP_CEDAR) - dma_bits = 32; + rdev->need_dma32 = true; #endif

+ dma_bits = rdev->need_dma32 ? 32 : 40; r = dma_set_mask_and_coherent(&rdev->pdev->dev, DMA_BIT_MASK(dma_bits)); if (r) { + rdev->need_dma32 = true; + dma_bits = 32; pr_warn("radeon: No suitable DMA available\n"); return r; } diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c index 357e8e98cca9..d2550862313e 100644 --- a/drivers/gpu/drm/radeon/radeon_ttm.c +++ b/drivers/gpu/drm/radeon/radeon_ttm.c @@ -787,7 +787,7 @@ int radeon_ttm_init(struct radeon_device *rdev) &radeon_bo_driver, rdev->ddev->anon_inode->i_mapping, rdev->ddev->vma_offset_manager, - dma_addressing_limited(&rdev->pdev->dev)); + rdev->need_dma32); if (r) { DRM_ERROR("failed initializing buffer object driver(%d).\n", r); return r;