On Thu, Nov 01 2007, Jeff Garzik wrote:
> Jens Axboe wrote:
>> On Thu, Nov 01 2007, Jeff Garzik wrote:
>>> Jens Axboe wrote:
>>>> Reverting just the default AHCI flags makes it work again. IOW, with the
>>>> below patch I can suspend properly with current -git.
>>>> diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
>>>> index ed9b407..77f7631 100644
>>>> --- a/drivers/ata/ahci.c
>>>> +++ b/drivers/ata/ahci.c
>>>> @@ -190,8 +190,7 @@ enum {
>>>> AHCI_FLAG_COMMON = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
>>>> ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA |
>>>> - ATA_FLAG_ACPI_SATA | ATA_FLAG_AN |
>>>> - ATA_FLAG_IPM,
>>>> + ATA_FLAG_ACPI_SATA | ATA_FLAG_AN,
>>>> AHCI_LFLAG_COMMON = ATA_LFLAG_SKIP_D2H_BSY,
>>>
>>> sounds like the easy thing to do, in light of this breakage, might be to
>>> default it to off, add a module parameter turning it on by setting that
>>> flag.
>> Wouldn't it be better to just get this bug fixed? IOW, is there a reason
>> for disabling ALPM if it's Bug Free?
>> I'd suggest committing the patch disabling IPM, then Kristen can debug
>> the thing in piece in quiet. Once confident it works with ahci again, we
>> can revert that commit.
>
> Right -- if you are going to commit a patch "disabling" it, it is best to
> do so via a simple module option, which allows users to easily try the
> feature in parallel with Intel's debugging.
OK, so you just want the option to be temporary? In that case I think a
config option is better, since you don't risk breaking peoples setups
later when removing the option. That can be quite annoying. Ala the
below.
diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index ba63619..e276ab6 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -48,6 +48,14 @@ config SATA_AHCI
If unsure, say N.
+config SATA_AHCI_IPM
+ bool "AHCI power management"
+ depends on EXPERIMENTAL && SATA_AHCI
+ help
+ This option adds support for AHCI power management. It current
+ breaks suspend on some laptops. This option is temporary and will
+ go away once those issues are fully resolved.
+
config SATA_SVW
tristate "ServerWorks Frodo / Apple K2 SATA support"
depends on PCI
diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index ed9b407..37266ce 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -190,8 +190,11 @@ enum {
AHCI_FLAG_COMMON = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA |
- ATA_FLAG_ACPI_SATA | ATA_FLAG_AN |
- ATA_FLAG_IPM,
+ ATA_FLAG_ACPI_SATA | ATA_FLAG_AN
+#ifdef CONFIG_SATA_AHCI_IPM
+ | ATA_FLAG_IPM
+#endif
+ ,
AHCI_LFLAG_COMMON = ATA_LFLAG_SKIP_D2H_BSY,
};
--
Jens Axboe
-
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