From: Jason Nader <dev@xxxxxxxxxxx>
Commit b8b8b4e0c052b2c06e1c4820a8001f4e0f77900f ("ata: ahci: Add Intel
Alder Lake-P AHCI controller to low power chipsets list") enabled LPM for
Alder Lake-P AHCI adaptors, however this introduced a regression on at
least one system which causes the SATA ports to become unusable [1].
The original commit stated it is for Alder Lake-P, which I understand is a
mobile CPU, however the device ID added (0x7ae2) matches the one reported
by my system which has an Alder Lake-S desktop CPU [2]. Searching for this
device on other websites points to 0x7ae2 being for the desktop "-S"
suffix [3] and not for the "-P" suffix, which is apparently 0x51d3 [4][5].
Reverting this commit restores SATA port functionality on my system [6][7].
[1] This Ubuntu bug report also appears to suffer from the same issue, so
there are more affected systems out there:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2063229
[2] System details:
CPU: Intel i5-12400
Motherboard: Biostar B660GTN
BIOS Settings: Intel VMD off, SATA hot plug off, CSM off
>lspci -nn -s 00:17
00:17.0 SATA controller [0106]: Intel Corporation Alder Lake-S PCH SATA Controller [AHCI Mode] [8086:7ae2] (rev 11)
[3] https://devicehunt.com/view/type/pci/vendor/8086/device/7AE2
[4] https://linux-hardware.org/?id=pci:8086-51d3-1462-1333
[5] https://linux-hardware.org/?view=search&vendorid=8086&deviceid=51d3#list
[6] Kernel logs before revert:
ahci 0000:00:17.0: AHCI 0001.0301 32 slots 4 ports 6 Gbps 0xf0 impl SATA mode
ata5: SATA max UDMA/133 abar m2048@0x80702000 port 0x80702300 irq 124 lpm-pol 3
ata6: SATA max UDMA/133 abar m2048@0x80702000 port 0x80702380 irq 124 lpm-pol 3
ata7: SATA max UDMA/133 abar m2048@0x80702000 port 0x80702400 irq 124 lpm-pol 3
ata8: SATA max UDMA/133 abar m2048@0x80702000 port 0x80702480 irq 124 lpm-pol 3
ata5: SATA link down (SStatus 4 SControl 300)
ata6: SATA link down (SStatus 4 SControl 300)
ata8: SATA link down (SStatus 4 SControl 300)
ata7: SATA link down (SStatus 4 SControl 300)
[7] Kernel logs after revert:
ahci 0000:00:17.0: AHCI 0001.0301 32 slots 4 ports 6 Gbps 0xf0 impl SATA mode
ata5: SATA max UDMA/133 abar m2048@0x80802000 port 0x80802300 irq 125 lpm-pol 0
ata6: SATA max UDMA/133 abar m2048@0x80802000 port 0x80802380 irq 125 lpm-pol 0
ata7: SATA max UDMA/133 abar m2048@0x80802000 port 0x80802400 irq 125 lpm-pol 0
ata8: SATA max UDMA/133 abar m2048@0x80802000 port 0x80802480 irq 125 lpm-pol 0
ata8: SATA link down (SStatus 0 SControl 300)
ata7: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
ata5: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
ata6: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
Jason Nader (1):
ata: ahci: Revert "ata: ahci: Add Intel Alder Lake-P AHCI controller
to low power chipsets list"
drivers/ata/ahci.c | 1 -
1 file changed, 1 deletion(-)
--
2.45.0
