Hi Hans,
With regards,
Suman
-----Original Message-----
From: Hans de Goede <hdegoede@xxxxxxxxxx>
Sent: Thursday, September 6, 2018 1:06 PM
To: Suman Tripathi <stripathi@xxxxxxxxxxxxxxxxxxx>; axboe@xxxxxxxxx; tj@xxxxxxxxxx; linux-ide@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; joe@xxxxxxxxxxx; arnd@xxxxxxxx; gregkh@xxxxxxxxxxxxxxxxxxx
Cc: Open Source Submission <patches@xxxxxxxxxxxxxxxxxxx>; Rameshwar Sahu <Rameshwar.Sahu@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [PATCH v3] ata: Disable AHCI ALPM feature for Ampere Computing eMAG SATA
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Hi,
On 06-09-18 20:05, Suman Tripathi wrote:
> Due to hardware errata, Ampere Computing eMAG SATA can't support AHCI
> ALPM feature. This patch disables the AHCI ALPM feature for eMAG SATA.
>
> Signed-off-by: Suman Trpathi <stripathi@xxxxxxxxxxxxxxxxxxx>
> Signed-off-by: Rameshwar Prasad Sahu
> <rameshwar.sahu@xxxxxxxxxxxxxxxxxxx>
Sorry, but the patch is still coming through mangled. Did you use git send-email ?
[Suman Tripathi] yes. I rechecked before sending twice. Sorry for the inconvenience. Will figure the issue out
Regards,
Hans
>
> ---
> Changes for v3:
>
> * Fix the indentation and whitespace warnings.
>
> Changes for v2:
>
> * Introduce the new ata_port_info object which includes ATA_FLAG_NO_LPM.
> * Include this object for eMAG SATA inside the acpi match table.
> * Retrieve the ata_port_info from the acpi match table.
>
> ---
> drivers/ata/ahci_platform.c | 15 ++++++++++++++-
> 1 file changed, 14 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/ata/ahci_platform.c b/drivers/ata/ahci_platform.c
> index 99f9a89..9ba283f 100644
> --- a/drivers/ata/ahci_platform.c
> +++ b/drivers/ata/ahci_platform.c
> @@ -33,6 +33,13 @@ static const struct ata_port_info ahci_port_info = {
> .port_ops = &ahci_platform_ops,
> };
>
> +static const struct ata_port_info ahci_port_info_nolpm = {
> + .flags = AHCI_FLAG_COMMON | ATA_FLAG_NO_LPM,
> + .pio_mask = ATA_PIO4,
> + .udma_mask = ATA_UDMA6,
> + .port_ops = &ahci_platform_ops,
> +};
> +
> static struct scsi_host_template ahci_platform_sht = {
> AHCI_SHT(DRV_NAME),
> };
> @@ -41,6 +48,7 @@ static int ahci_probe(struct platform_device *pdev)
> {
> struct device *dev = &pdev->dev;
> struct ahci_host_priv *hpriv;
> + const struct ata_port_info *port;
> int rc;
>
> hpriv = ahci_platform_get_resources(pdev);
> @@ -57,7 +65,11 @@ static int ahci_probe(struct platform_device *pdev)
> if (of_device_is_compatible(dev->of_node, "hisilicon,hisi-ahci"))
> hpriv->flags |= AHCI_HFLAG_NO_FBS | AHCI_HFLAG_NO_NCQ;
>
> - rc = ahci_platform_init_host(pdev, hpriv, &ahci_port_info,
> + port = acpi_device_get_match_data(dev);
> + if (!port)
> + port = &ahci_port_info;
> +
> + rc = ahci_platform_init_host(pdev, hpriv, port,
> &ahci_platform_sht);
> if (rc)
> goto disable_resources;
> @@ -85,6 +97,7 @@ static const struct of_device_id ahci_of_match[] = {
> MODULE_DEVICE_TABLE(of, ahci_of_match);
>
> static const struct acpi_device_id ahci_acpi_match[] = {
> + { "APMC0D33", (unsigned long)&ahci_port_info_nolpm },
> { ACPI_DEVICE_CLASS(PCI_CLASS_STORAGE_SATA_AHCI, 0xffffff) },
> {},
> };
> --
> 2.7.4
>
