Messages in this thread | | | From | Arnd Bergmann <> | Subject | Re: [PATCH v2] ata: add AMD Seattle platform driver | Date | Tue, 26 Jan 2016 13:17:16 +0100 |
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On Monday 25 January 2016 15:43:00 Tejun Heo wrote: > On Thu, Jan 14, 2016 at 10:31:11AM -0600, Brijesh Singh wrote: > > AMD Seattle SATA controller mostly conforms to AHCI interface with some > > special register to control SGPIO interface. In the case of an AHCI > > controller, the SGPIO feature is ideally implemented using the > > "Enclosure Management" register of the AHCI controller, but those > > registeres are not implemented in the Seattle SoC. Instead SoC > > (Rev B0 onwards) provides a 32-bit SGPIO control register which should > > be programmed to control the activity, locate and fault LEDs. > > > > The driver is based on ahci_platform driver. > > > > Signed-off-by: Brijesh Singh <brijesh.singh@amd.com> > > Acked-by: Hans de Goede <hdegoede@redhat.com> > > CC: tj@kernel.org > > CC: linux-ide@vger.kernel.org > > Hans, can you please review the patch? >
I think it needs more work: The changelog describes it as a normal driver, but based on the previous discussion, this is just a hack to work around broken BIOS versions that can no longer be fixed in the field, and there has not been a decision what the proper representation should be in ACPI.
The patch also fails to address the devicetree based case, even though we did come to a conclusion that the current behavior is a regression (compared to what we had in drivers/ide/) and that there is a relatively simple fix to do it right.
I'd rather see this problem solved for DT first and then have a discussion about what the ACPI binding should look like, with a review from ACPI folks before this hack gets cemented in the kernel.
Arnd
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