Messages in this thread | | | Subject | Re: [PATCH 1/2] ahci: Add PhyRdy Change control on actual LPM capability | From | RunaGuo-oc <> | Date | Fri, 22 Apr 2022 17:57:19 +0800 |
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On 2022/4/21 18:39, Damien Le Moal wrote: > On 4/21/22 18:43, Runa Guo-oc wrote: >> On some platform, when OS enables LPM by default (eg, min_power), >> then, PhyRdy Change cannot be detected if ahci supports no LPM. > Do you mean "...if the ahci adapter does not support LPM." ?
Yes.
> If that is what you mean, then min_power should not be set.
Yes, I agree with you. But, as we know, link_power_management is a user policy which can be modified, if some users are not familiar with ahci spec, then the above case may happen.
> Mario has patches to fix that.
Hmm. How to patch this case ?
>> In ahci spec, PhyRdy Change cannot coexist with LPM. >> >> Adds support to control this case on actual LPM capability. >> >> Signed-off-by: Runa Guo-oc <RunaGuo-oc@zhaoxin.com> >> --- >> drivers/ata/ahci.c | 9 +++++++++ >> drivers/ata/libata-eh.c | 4 ++++ >> include/linux/libata.h | 4 ++++ >> 3 files changed, 17 insertions(+) >> >> diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c >> index 397dfd2..03f0cb3 100644 >> --- a/drivers/ata/ahci.c >> +++ b/drivers/ata/ahci.c >> @@ -1870,6 +1870,15 @@ static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent) >> else >> dev_info(&pdev->dev, "SSS flag set, parallel bus scan disabled\n"); >> >> + if (hpriv->cap & HOST_CAP_PART) >> + host->flags |= ATA_HOST_PART; >> + >> + if (hpriv->cap & HOST_CAP_SSC) >> + host->flags |= ATA_HOST_SSC; >> + >> + if (hpriv->cap2 & HOST_CAP2_SDS) >> + host->flags |= ATA_HOST_DEVSLP; >> + >> if (pi.flags & ATA_FLAG_EM) >> ahci_reset_em(host); >> >> diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c >> index 3307ed4..05b1043 100644 >> --- a/drivers/ata/libata-eh.c >> +++ b/drivers/ata/libata-eh.c >> @@ -3246,6 +3246,10 @@ static int ata_eh_set_lpm(struct ata_link *link, enum ata_lpm_policy policy, >> unsigned int err_mask; >> int rc; >> >> + /* if controller does not support lpm, then sets no LPM flags*/ >> + if (!(ap->host->flags & (ATA_HOST_PART | ATA_HOST_SSC | ATA_HOST_DEVSLP))) >> + link->flags |= ATA_LFLAG_NO_LPM; >> + >> /* if the link or host doesn't do LPM, noop */ >> if (!IS_ENABLED(CONFIG_SATA_HOST) || >> (link->flags & ATA_LFLAG_NO_LPM) || (ap && !ap->ops->set_lpm)) >> diff --git a/include/linux/libata.h b/include/linux/libata.h >> index 732de90..7a243f4 100644 >> --- a/include/linux/libata.h >> +++ b/include/linux/libata.h >> @@ -216,6 +216,10 @@ enum { >> ATA_HOST_PARALLEL_SCAN = (1 << 2), /* Ports on this host can be scanned in parallel */ >> ATA_HOST_IGNORE_ATA = (1 << 3), /* Ignore ATA devices on this host. */ >> >> + ATA_HOST_PART = (1 << 4), /* Host support partial.*/ >> + ATA_HOST_SSC = (1 << 5), /* Host support slumber.*/ >> + ATA_HOST_DEVSLP = (1 << 6), /* Host support devslp.*/ >> + >> /* bits 24:31 of host->flags are reserved for LLD specific flags */ >> >> /* various lengths of time */ >
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