linux-kernel - Re: [PATCH v2 2/2] ata: ahci: Rename CONFIG_SATA_LPM

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Date:   Wed, 6 Apr 2022 11:10:48 +0900
From:   Damien Le Moal <damien.lemoal@...nsource.wdc.com>
To:     Mario Limonciello <mario.limonciello@....com>
Cc:     "open list:LIBATA SUBSYSTEM (Serial and Parallel ATA drivers)" 
        <linux-ide@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>, hdegoede@...hat.com,
        Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH v2 2/2] ata: ahci: Rename CONFIG_SATA_LPM_POLICY
 configuration item back

On 4/5/22 05:02, Mario Limonciello wrote:
> CONFIG_SATA_LPM_MOBILE_POLICY was renamed to CONFIG_SATA_LPM_POLICY in
> commit 4dd4d3deb502 ("ata: ahci: Rename CONFIG_SATA_LPM_MOBILE_POLICY
> configuration item").
> 
> This caused some pain as users would invisibly lose configuration policy
> defaults when they built the new kernel.  To help alleviate that, switch
> back to the old name (even if it's wrong).
> 
> Suggested-by: Christoph Hellwig <hch@...radead.org>
> Suggested-by: Damien Le Moal <damien.lemoal@...nsource.wdc.com>
> Signed-off-by: Mario Limonciello <mario.limonciello@....com>

I applied this manually as the "default 3" is from the first patch, 
which is for 5.19. This one is queued in for-5.18-fixes now. Thanks.

> ---
> v1->v2:
>   * New patch
>   drivers/ata/Kconfig | 6 ++++--
>   drivers/ata/ahci.c  | 2 +-
>   drivers/ata/ahci.h  | 2 +-
>   3 files changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
> index 3ffe14057ed2..c3194b80c655 100644
> --- a/drivers/ata/Kconfig
> +++ b/drivers/ata/Kconfig
> @@ -115,14 +115,16 @@ config SATA_AHCI
>   
>   	  If unsure, say N.
>   
> -config SATA_LPM_POLICY
> +config SATA_MOBILE_LPM_POLICY
>   	int "Default SATA Link Power Management policy for low power chipsets"
>   	range 0 4
>   	default 3
>   	depends on SATA_AHCI
>   	help
>   	  Select the Default SATA Link Power Management (LPM) policy to use
> -	  for chipsets / "South Bridges" designated as supporting low power.
> +	  for chipsets / "South Bridges" supporting low-power modes. Such
> +	  chipsets are typically found on most laptops but desktops and
> +	  servers now also widely use chipsets with low power modes support.
>   
>   	  The value set has the following meanings:
>   		0 => Keep firmware settings
> diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
> index 84456c05e845..397dfd27c90d 100644
> --- a/drivers/ata/ahci.c
> +++ b/drivers/ata/ahci.c
> @@ -1595,7 +1595,7 @@ static int ahci_init_msi(struct pci_dev *pdev, unsigned int n_ports,
>   static void ahci_update_initial_lpm_policy(struct ata_port *ap,
>   					   struct ahci_host_priv *hpriv)
>   {
> -	int policy = CONFIG_SATA_LPM_POLICY;
> +	int policy = CONFIG_SATA_MOBILE_LPM_POLICY;
>   
>   
>   	/* Ignore processing for chipsets that don't use policy */
> diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h
> index 6ead58c1b6e5..ad11a4c52fbe 100644
> --- a/drivers/ata/ahci.h
> +++ b/drivers/ata/ahci.h
> @@ -236,7 +236,7 @@ enum {
>   	AHCI_HFLAG_NO_WRITE_TO_RO	= (1 << 24), /* don't write to read
>   							only registers */
>   	AHCI_HFLAG_USE_LPM_POLICY	= (1 << 25), /* chipset that should use
> -							SATA_LPM_POLICY
> +							SATA_MOBILE_LPM_POLICY
>   							as default lpm_policy */
>   	AHCI_HFLAG_SUSPEND_PHYS		= (1 << 26), /* handle PHYs during
>   							suspend/resume */


-- 
Damien Le Moal
Western Digital Research