[cc: -dmitry, -guenter]
Dear Damien,
Am 04.01.22 um 09:36 schrieb Damien Le Moal:
On 12/31/21 16:08, Paul Menzel wrote:
Am 31.12.21 um 01:52 schrieb Damien Le Moal:
On 12/30/21 20:08, Paul Menzel wrote:
board_ahci_nomsi,
board_ahci_noncq,
board_ahci_nosntf,
@@ -141,6 +142,13 @@ static const struct ata_port_info ahci_port_info[] = {
.udma_mask = ATA_UDMA6,
.port_ops = &ahci_ops,
},
+ [board_ahci_nodbdelay] = {
+ .flags = AHCI_FLAG_COMMON,
+ .link_flags = ATA_LFLAG_NO_DB_DELAY,
+ .pio_mask = ATA_PIO4,
+ .udma_mask = ATA_UDMA6,
+ .port_ops = &ahci_ops,
+ },
[board_ahci_nomsi] = {
AHCI_HFLAGS (AHCI_HFLAG_NO_MSI),
.flags = AHCI_FLAG_COMMON,
@@ -437,6 +445,7 @@ static const struct pci_device_id ahci_pci_tbl[] = {
board_ahci_al },
/* AMD */
{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_HUDSON2_SATA_IDE), board_ahci },
+ { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_HUDSON2_SATA_AHCI), board_ahci_nodbdelay },
Patch 1 introduces this macro in pci_ids.h, but it is used only here. So
to keep with the current style in this structure, drop the macro (so
drop patch 1).
I wait for your answer of the second patch, and then I am going to sent v4.
Let's use the numeric value. No macro definition needed.
Alright. I am going to follow the maintainers wishes.
{ PCI_VDEVICE(AMD, 0x7900), board_ahci }, /* AMD CZ */
{ PCI_VDEVICE(AMD, 0x7901), board_ahci_mobile }, /* AMD Green Sardine */
/* AMD is using RAID class only for ahci controllers */
Do you have a AHCI device at hand, where you could also test if
everything works fine without the delay?
Unfortunately, I do not have any board with this adapter.
Sorry, we misunderstand each other. (I wrote a reply to my own patch [1].)
I think the delay is not necessary for any modern AHCI controller. It’d
be great, if you could test, if it’s also true on the systems you have
by just skipping the delay.
I need to figure out how to safely test suspend/resume remotely (working
from home) :)
Please note, I tested the cold bootup, where `sata_link_resume()` is
also run.
It would indeed be great to have the default as "no delay on resume" and
add the delay only for chipsets that need it. However, it is unclear
which chipset need the delay, right?
Yes, it’s unclear for what chipset (PHY?) it was added, as the git
history i not available in the repository, and I have not found it yet.
So I think we are stuck with switching chipsets to "no delay" one by
one by testing. Once the majority of drivers are converted, we can
reverse the default to be "no delay" and mark untested drivers as
needing the delay.
For easy testing, a new CLI parameter to skip the delay might be handy.
Kind regards,
Paul
[1]: https://lore.kernel.org/linux-ide/20211227162658.11314-2-pmenzel@xxxxxxxxxxxxx/T/#m697d2121463a4c946730e6b83940e12d6d7e6700
