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Subject: Re: [PATCH v3] ata: Disable AHCI ALPM feature for Ampere Computing
 eMAG SATA
To:     Suman Tripathi <stripathi@amperecomputing.com>, axboe@kernel.dk,
        tj@kernel.org, linux-ide@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        joe@perches.com, arnd@arndb.de, gregkh@linuxfoundation.org
Cc:     patches@amperecomputing.com,
        Rameshwar Prasad Sahu <rameshwar.sahu@amperecomputing.com>
References: <1536208421-24867-1-git-send-email-stripathi@amperecomputing.com>
From:   Hans de Goede <hdegoede@redhat.com>
Message-ID: <a1c6012f-3b50-0e5e-677c-41903b4ccf64@redhat.com>
Date:   Thu, 6 Sep 2018 09:31:33 +0200
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Hi,

On 06-09-18 06:33, 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.
> 
> 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.
> 
> Changes for v3:
> 
> * Fix the indentation and whitespace warnings.
> 
> Signed-off-by: Suman Trpathi <stripathi@amperecomputing.com>
> Signed-off-by: Rameshwar Prasad Sahu <rameshwar.sahu@amperecomputing.com>

Small remark, normally the changelog is put after the Signed-off-by messages like
this:

"""
Signed-off-by: Suman Trpathi <stripathi@amperecomputing.com>
Signed-off-by: Rameshwar Prasad Sahu <rameshwar.sahu@amperecomputing.com>
---
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.
"""

This will cause git am to remove it, so that the git history just
has your original commit message.

By itself this would not be a reason to request a new version, but it
seems you've copy and pasted the patch from "git format-patch" output
into you mail client. I tried to run checkpatch myself to make
sure you caught all whitespace issues and I got this:

[hans@shalem linux]$ scripts/checkpatch.pl ~/\[PATCH\ v3\]\ ata\:\ Disable\ AHCI\ ALPM\ feature\ for\ Ampere\ Computing\ eMAG\ SATA.eml
ERROR: patch seems to be corrupt (line wrapped?)
#177: FILE: drivers/ata/ahci_platform.c:34:


ERROR: DOS line endings
#178: FILE: drivers/ata/ahci_platform.c:35:
+static const struct ata_port_info ahci_port_info_nolpm = {^M$

ERROR: DOS line endings
#179: FILE: drivers/ata/ahci_platform.c:36:
+^I.flags^I^I= AHCI_FLAG_COMMON | ATA_FLAG_NO_LPM,^M$

ERROR: DOS line endings
#180: FILE: drivers/ata/ahci_platform.c:37:
+^I.pio_mask^I= ATA_PIO4,^M$

ERROR: DOS line endings
#181: FILE: drivers/ata/ahci_platform.c:38:
+^I.udma_mask^I= ATA_UDMA6,^M$

Followed by lots more errors, line 177 of the email is empty,
while it should contain a single space. This stripping
of whitespace typically is the result of copy pasting
or some other processing of the patch.

Please try to re-send v3 using the "git send-email" command,
so that we get a patch which we can actually apply.

Regards,

Hans


> ---
>   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
>