linux-kernel - Re: TI: X15 the connected SSD is not detected on Linux next 20221006 tag

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Date:   Wed, 30 Nov 2022 15:10:37 +0530
From:   Naresh Kamboju <naresh.kamboju@...aro.org>
To:     Serge Semin <fancer.lancer@...il.com>,
        Praneeth Bajjuri <praneeth@...com>,
        Arnd Bergmann <arnd@...db.de>
Cc:     Anders Roxell <anders.roxell@...aro.org>,
        Serge Semin <Sergey.Semin@...kalelectronics.ru>,
        Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        open list <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        regressions@...ts.linux.dev,
        "open list:LIBATA SUBSYSTEM (Serial and Parallel ATA drivers)" 
        <linux-ide@...r.kernel.org>, lkft-triage@...ts.linaro.org,
        Lukas Bulwahn <lukas.bulwahn@...il.com>,
        Niklas Cassel <niklas.cassel@....com>,
        Carlos Hernandez <ceh@...com>,
        Sumit Semwal <sumit.semwal@...aro.org>
Subject: Re: TI: X15 the connected SSD is not detected on Linux next 20221006 tag

On Mon, 17 Oct 2022 at 21:22, Serge Semin <fancer.lancer@...il.com> wrote:
>
> On Mon, Oct 17, 2022 at 09:43:24AM +0200, Anders Roxell wrote:
> > On Fri, 14 Oct 2022 at 16:06, Serge Semin
> > <Sergey.Semin@...kalelectronics.ru> wrote:
> > >
> > > On Fri, Oct 14, 2022 at 11:22:38AM +0200, Anders Roxell wrote:
> > > > On Fri, 14 Oct 2022 at 09:53, Damien Le Moal
> > > > <damien.lemoal@...nsource.wdc.com> wrote:
> > > > >
> > > > > On 10/14/22 16:31, Arnd Bergmann wrote:
> > > > > > On Fri, Oct 14, 2022, at 2:22 AM, Damien Le Moal wrote:
> > > > > >> On 10/14/22 07:07, Anders Roxell wrote:
> > > > > >> [...]
> > > > > >>>> 8)
> > > > > >>>>> If reverting these patches restores the eSATA port on this board, then you need
> > > > > >>>>> to fix the defconfig for that board.
> > > > > >>>>
> > > > > >>>> OTOH,
> > > > > >>>> Anders, enabled the new config CONFIG_AHCI_DWC=y  and tried but the
> > > > > >>>> device failed to boot.
> > > > > >>>
> > > > > >>> I thought it would work with enabling CONFIG_AHCI_DWC=y, but it didn't...
> > > > > >>
> > > > > >> As mentioned in my previous reply to Naresh, this is a new driver added in
> > > > > >> 6.1. Your board was working before so this should not be the driver needed
> > > > > >> for it.
> > > > > >>
> > > > > >>> However, reverting patch 33629d35090f ("ata: ahci: Add DWC AHCI SATA
> > > > > >>> controller support")
> > > > > >>> from next-20221013 was a success, kernel booted  and the 'mkfs.ext4' cmd was
> > > > > >>> successful.
> > > > > >>
> > > > > >> Which is very strange... There is only one hunk in that commit that could
> > > > > >> be considered suspicious:
> > > > > >>
> > > > > >> diff --git a/drivers/ata/ahci_platform.c b/drivers/ata/ahci_platform.c
> > > > > >> index 9b56490ecbc3..8f5572a9f8f1 100644
> > > > > >> --- a/drivers/ata/ahci_platform.c
> > > > > >> +++ b/drivers/ata/ahci_platform.c
> > > > > >> @@ -80,9 +80,7 @@ static SIMPLE_DEV_PM_OPS(ahci_pm_ops, ahci_platform_suspend,
> > > > > >>  static const struct of_device_id ahci_of_match[] = {
> > > > > >>         { .compatible = "generic-ahci", },
> > > > > >>         /* Keep the following compatibles for device tree compatibility */
> > > > > >> -       { .compatible = "snps,spear-ahci", },
> > > > > >>         { .compatible = "ibm,476gtr-ahci", },
> > > > > >> -       { .compatible = "snps,dwc-ahci", },
> > > > > >>         { .compatible = "hisilicon,hisi-ahci", },
> > > > > >>         { .compatible = "cavium,octeon-7130-ahci", },
> > > > > >>         { /* sentinel */ }
> > > > > >>
> > > > > >> Is your board using one of these compatible string ?
> > > > > >
> > > > > > The x15 uses "snps,dwc-ahci". I would expect it to detect the device
> > > > > > with the new driver if that is loaded, but it's possible that the
> > > > > > driver does not work on all versions of the dwc-ahci hardware.
> > > > > >
> > > > > > Anders, can you provide the boot log from a boot with the new driver
> > > > > > built in? There should be some messages from dwc-ahci about finding
> > > > > > the device, but then not ultimately working.
> > > > > >
> > > > > > Depending on which way it goes wrong, the safest fallback for 6.1 is
> > > > > > probably to move the "snps,spear-ahci" and "snps,dwc-ahci" compatible
> > > > > > strings back into the old driver, and leave the new one only for
> > > > > > the "baikal,bt1-ahci" implementation of it, until it has been
> > > > > > successfully verified on TI am5/dra7, spear13xx and exynos.
> > > > >
> > > > > OK. So a fix patch until further tests/debug is completed would be this:
> > > > >
> > > > > diff --git a/drivers/ata/ahci_dwc.c b/drivers/ata/ahci_dwc.c
> > > > > index 8fb66860db31..7a0cbab00843 100644
> > > > > --- a/drivers/ata/ahci_dwc.c
> > > > > +++ b/drivers/ata/ahci_dwc.c
> > > > > @@ -469,8 +469,6 @@ static struct ahci_dwc_plat_data ahci_bt1_plat = {
> > > > >  };
> > > > >
> > > > >  static const struct of_device_id ahci_dwc_of_match[] = {
> > > > > -       { .compatible = "snps,dwc-ahci", &ahci_dwc_plat },
> > > > > -       { .compatible = "snps,spear-ahci", &ahci_dwc_plat },
> > > > >         { .compatible = "baikal,bt1-ahci", &ahci_bt1_plat },
> > > > >         {},
> > > > >  };
> > > > > diff --git a/drivers/ata/ahci_platform.c b/drivers/ata/ahci_platform.c
> > > > > index 8f5572a9f8f1..9b56490ecbc3 100644
> > > > > --- a/drivers/ata/ahci_platform.c
> > > > > +++ b/drivers/ata/ahci_platform.c
> > > > > @@ -80,7 +80,9 @@ static SIMPLE_DEV_PM_OPS(ahci_pm_ops, ahci_platform_suspend,
> > > > >  static const struct of_device_id ahci_of_match[] = {
> > > > >         { .compatible = "generic-ahci", },
> > > > >         /* Keep the following compatibles for device tree compatibility */
> > > > > +       { .compatible = "snps,spear-ahci", },
> > > > >         { .compatible = "ibm,476gtr-ahci", },
> > > > > +       { .compatible = "snps,dwc-ahci", },
> > > > >         { .compatible = "hisilicon,hisi-ahci", },
> > > > >         { .compatible = "cavium,octeon-7130-ahci", },
> > > > >         { /* sentinel */ }


FYI,

We have been noticing this problem [a] & [b] on Linux mainline master 6.1.0-rc7

    Test error: mkfs.ext4
/dev/disk/by-id/ata-SanDisk_SSD_PLUS_120GB_190702A00D84 failed; job
exit

Please suggest a way forward on this reported issue on arm32 TI BeagleBoard X15
device. Build and Kernel configs details provided in the metadata section.

metadata:
  git_ref: master
  git_repo: https://gitlab.com/Linaro/lkft/mirrors/torvalds/linux-mainline
  git_sha: b7b275e60bcd5f89771e865a8239325f86d9927d
  git_describe: v6.1-rc7
  kernel_version: 6.1.0-rc7
  kernel-config: https://builds.tuxbuild.com/2I9I42JhhQqS9GOpFppfRiuqtRW/config
  build-url: https://gitlab.com/Linaro/lkft/mirrors/torvalds/linux-mainline/-/pipelines/706371149
  artifact-location: https://builds.tuxbuild.com/2I9I42JhhQqS9GOpFppfRiuqtRW
  toolchain: gcc-10

[a] https://lkft.validation.linaro.org/scheduler/job/5892099
[b] https://lore.kernel.org/all/20221017155246.zxal2cfehjgaajcu@mobilestation/

- Naresh