Re: [PATCH v3] ata: ahci: Skip 200 ms debounce delay for Marvell 88SE9235
From: Damien Le Moal
Date: Tue Feb 01 2022 - 03:27:55 EST
On 2022/02/01 16:12, Paul Menzel wrote:
> The 200 ms delay before debouncing the PHY in `sata_link_resume()` is
> not needed for the Marvell 88SE9235.
>
> $ lspci -nn -s 0021:0e:00.0
> 0021:0e:00.0 SATA controller [0106]: Marvell Technology Group Ltd. 88SE9235 PCIe 2.0 x2 4-port SATA 6 Gb/s Controller [1b4b:9235] (rev 11)
>
> So, remove it. Tested on IBM S822LC with current Linux 5.17-rc1:
>
> Currently, without this patch (with 200 ms delay), device probe for ata1
> takes 485 ms:
>
> [ 3.358158] ata1: SATA max UDMA/133 abar m2048@0x3fe881000000 port 0x3fe881000100 irq 39
> [ 3.358175] ata2: SATA max UDMA/133 abar m2048@0x3fe881000000 port 0x3fe881000180 irq 39
> [ 3.358191] ata3: SATA max UDMA/133 abar m2048@0x3fe881000000 port 0x3fe881000200 irq 39
> [ 3.358207] ata4: SATA max UDMA/133 abar m2048@0x3fe881000000 port 0x3fe881000280 irq 39
> […]
> [ 3.677542] ata3: SATA link down (SStatus 0 SControl 300)
> [ 3.677719] ata4: SATA link down (SStatus 0 SControl 300)
> [ 3.839242] ata2: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
> [ 3.839828] ata2.00: ATA-10: ST1000NX0313 00LY266 00LY265IBM, BE33, max UDMA/133
> [ 3.840029] ata2.00: 1953525168 sectors, multi 0: LBA48 NCQ (depth 32), AA
> [ 3.841796] ata2.00: configured for UDMA/133
> [ 3.843231] ata1: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
> [ 3.844083] ata1.00: ATA-10: ST1000NX0313 00LY266 00LY265IBM, BE33, max UDMA/133
> [ 3.844313] ata1.00: 1953525168 sectors, multi 0: LBA48 NCQ (depth 32), AA
> [ 3.846043] ata1.00: configured for UDMA/133
>
> With this patch (no delay) device probe for ata1 takes 273 ms:
>
> [ 3.624259] ata1: SATA max UDMA/133 abar m2048@0x3fe881000000 port 0x3f e881000100 irq 39
> [ 3.624436] ata2: SATA max UDMA/133 abar m2048@0x3fe881000000 port 0x3f e881000180 irq 39
> [ 3.624452] ata3: SATA max UDMA/133 abar m2048@0x3fe881000000 port 0x3f e881000200 irq 39
> [ 3.624468] ata4: SATA max UDMA/133 abar m2048@0x3fe881000000 port 0x3f e881000280 irq 39
> […]
> [ 3.731966] ata3: SATA link down (SStatus 0 SControl 300)
> [ 3.732069] ata4: SATA link down (SStatus 0 SControl 300)
> [ 3.897448] ata1: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
> [ 3.897678] ata2: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
> [ 3.898140] ata1.00: ATA-10: ST1000NX0313 00LY266 00LY265IBM, BE33, max UDMA/133
> [ 3.898175] ata2.00: ATA-10: ST1000NX0313 00LY266 00LY265IBM, BE33, max UDMA/133
> [ 3.898287] ata1.00: 1953525168 sectors, multi 0: LBA48 NCQ (depth 32), AA
> [ 3.898349] ata2.00: 1953525168 sectors, multi 0: LBA48 NCQ (depth 32), AA
> [ 3.900070] ata1.00: configured for UDMA/133
> [ 3.900166] ata2.00: configured for UDMA/133
>
> Signed-off-by: Paul Menzel <pmenzel@xxxxxxxxxxxxx>
> ---
> v2: address comments for commit message (but forgot v2 tag)
> v3: resend with v3 tag in subject line/commit message summary
>
> drivers/ata/ahci.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
> index ab5811ef5a53..edca4e8fd44e 100644
> --- a/drivers/ata/ahci.c
> +++ b/drivers/ata/ahci.c
> @@ -582,6 +582,8 @@ static const struct pci_device_id ahci_pci_tbl[] = {
> .driver_data = board_ahci_yes_fbs },
> { PCI_DEVICE(PCI_VENDOR_ID_MARVELL_EXT, 0x9230),
> .driver_data = board_ahci_yes_fbs },
> + { PCI_DEVICE(PCI_VENDOR_ID_MARVELL_EXT, 0x9235),
> + .driver_data = board_ahci_no_debounce_delay },
> { PCI_DEVICE(PCI_VENDOR_ID_TTI, 0x0642), /* highpoint rocketraid 642L */
> .driver_data = board_ahci_yes_fbs },
> { PCI_DEVICE(PCI_VENDOR_ID_TTI, 0x0645), /* highpoint rocketraid 644L */
Looks good. Will apply to for-5.18.
--
Damien Le Moal
Western Digital Research