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82e4753322
A user reported that commit105c42566a("ata: ahci: force 32-bit DMA for JMicron JMB582/JMB585") made the JMicron JMB585 unusable on his board. The failure is seen as soon as the ahci driver is probed, and booting with iommu=off does not solve the problem. Looking at the AHCI specification, PxCLBU and PxFBU are both read only '0' for HBAs that do not support 64-bit addressing. For HBAs that do support 64-bit addressing, the registers are read write, with a reset value that is Implementation Specific. When using the AHCI_HFLAG_32BIT_ONLY flag, the HBA does support 64-bit addressing, and a 32-bit DMA mask is set by simply clearing HOST_CAP_64. Thus, in this case, we need to explicitly clear the registers to 0. Fixes:105c42566a("ata: ahci: force 32-bit DMA for JMicron JMB582/JMB585") Fixes:c7a42156d9("ahci: disable 64bit dma on sb600") Cc: stable@vger.kernel.org Reported-by: Roland Waltersson <roland.waltersson@netinsight.net> Closes: https://lore.kernel.org/linux-ide/IA0PR17MB668730A4ECCD65F7A1DC3EDC9EB62@IA0PR17MB6687.namprd17.prod.outlook.com/ Reviewed-by: Damien Le Moal <dlemoal@kernel.org> Link: https://lore.kernel.org/r/20260904134310.1465051-2-cassel@kernel.org Signed-off-by: Niklas Cassel <cassel@kernel.org>
2787 lines
72 KiB
2787 lines
72 KiB