arm64: mm: fix DMA zone when dma-ranges is missing

Some platforms, like Rockchip RK3568 based Odroid M1, do not provide DMA
limits information in device-tree dma-ranges property. Still some device
drivers set DMA limit that relies on DMA zone at low 4GB memory area.
Until commit ba0fb44aed47 ("dma-mapping: replace zone_dma_bits by
zone_dma_limit"), zone_sizes_init() restricted DMA zone to low 32-bit.

Restore DMA zone 32-bit limit when the platform provides no DMA bus
limit information.

Fixes: ba0fb44aed47 ("dma-mapping: replace zone_dma_bits by zone_dma_limit")
Reported-by: Marek Szyprowski <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Suggested-by: Robin Murphy <[email protected]>
Signed-off-by: Baruch Siach <[email protected]>
Reviewed-by: Catalin Marinas <[email protected]>
Tested-by: Marek Szyprowski <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>

0 files changed, 0 insertions, 0 deletions