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[ Upstream commitf1bc9fc4a0] 64-bit DMA detection will fail if axienet was started before (by boot loader, boot ROM, etc). In this state axienet will not start properly. XAXIDMA_TX_CDESC_OFFSET + 4 register (MM2S_CURDESC_MSB) is used to detect 64-bit DMA capability here. But datasheet says: When DMACR.RS is 1 (axienet is in enabled state), CURDESC_PTR becomes Read Only (RO) and is used to fetch the first descriptor. So iowrite32()/ioread32() trick to this register to detect 64-bit DMA will not work. So move axienet reset before 64-bit DMA detection. Fixes:f735c40ed9("net: axienet: Autodetect 64-bit DMA capability") Signed-off-by: Maxim Kochetkov <fido_max@inbox.ru> Reviewed-by: Robert Hancock <robert.hancock@calian.com> Reviewed-by: Radhey Shyam Pandey <radhey.shyam.pandey@amd.com> Link: https://lore.kernel.org/r/20230622192245.116864-1-fido_max@inbox.ru Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>