commit a6c8e8bbdf24ece39e4f55c8ab464d28e5e44745
author Jiaxun Yang <jiaxun.yang@flygoat.com> Wed May 28 12:02:49 2025 +0100
committer Gerd Hoffmann <kraxel@redhat.com> Mon Jun 02 11:20:05 2025 +0200
tree 2af63ab3f0564407f768de701f95ead6241dafa7
parent 9029a010ec413e6c3c0eb52c29c252a5b9a9f774

ahci: Fix hangs due to controller reset

After adding AHCI controller reset functionality there are multiple
reports on AHCI booting regression.

As per my experiments on various machines, to reset controller
properly it is necessary to poll HOST_CTL_RESET bit until it's
clear. It is also required to read back HOST_CTL after changing
HOST_CTL_AHCI_EN bits to ensure the controller has accepted write.

Tested on ASMedia ASM1061, Intel H61 native SATA and AMD Phoenix
native SATA.

Link: https://mail.coreboot.org/hyperkitty/list/seabios@seabios.org/thread/RDNRKWBN4N5XQX2TQMM5P4WZ2OOPPNAM/
Link: https://github.com/FlyGoat/csmwrap/issues/14
Fixes: 8863cbbd15a7 ("ahci: add controller reset")
Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Acked-by: Paul Menzel <pmenzel@molgen.mpg.de>
Message-ID: <20250528-ahci-v2-1-9d7310217ca2@flygoat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>