drm/radeon/kms: set DMA mask properly on newer PCI asics (005a83f1) · Commits · 戴 / test

If a card wasn't PCIE, we always set the DMA mask to 32 bits. This is only applies to the old rage128/r1xx gart block on early radeon asics (~r1xx-r4xx). Newer PCI and IGP cards can handle 40 bits just fine. Signed-off-by:

Alex Deucher <alexander.deucher@amd.com> Cc: Chen Jie <chenj@lemote.com> Signed-off-by:

Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/radeon/radeon_device.c

+4 −3

Original line number	Diff line number	Diff line
		@@ -750,14 +750,15 @@ int radeon_device_init(struct radeon_device *rdev,

		/* set DMA mask + need_dma32 flags.
		* PCIE - can handle 40-bits.
		* IGP - can handle 40-bits (in theory)
		* IGP - can handle 40-bits
		* AGP - generally dma32 is safest
		* PCI - only dma32
		* PCI - dma32 for legacy pci gart, 40 bits on newer asics
		*/
		rdev->need_dma32 = false;
		if (rdev->flags & RADEON_IS_AGP)
		rdev->need_dma32 = true;
		if (rdev->flags & RADEON_IS_PCI)
		if ((rdev->flags & RADEON_IS_PCI) &&
		(rdev->family < CHIP_RS400))
		rdev->need_dma32 = true;

		dma_bits = rdev->need_dma32 ? 32 : 40;

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