linux-kernel - Re: [PATCH v4 1/2] ahci: Rename flag `ATA_LFLAG_NO_DB_DELAY` to `ATA_LFLAG_NO_DEBOUNCE

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Message-ID: <734cc427-eee0-89e0-1edd-6b483191c502@molgen.mpg.de>
Date:   Thu, 6 Jan 2022 09:09:22 +0100
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Damien Le Moal <damien.lemoal@...nsource.wdc.com>
Cc:     linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/2] ahci: Rename flag `ATA_LFLAG_NO_DB_DELAY` to
 `ATA_LFLAG_NO_DEBOUNCE_DELAY`

Dear Damien,


Am 06.01.22 um 08:55 schrieb Damien Le Moal:
> On 1/6/22 16:35, Paul Menzel wrote:

>> Am 06.01.22 um 03:52 schrieb Damien Le Moal:
>>> On 1/6/22 00:36, Paul Menzel wrote:
>>>> The new name is longer, but clearer.
>>>
>>> It looks like you sent an incremental change on top of your previous
>>> patches. Please send a cleaned up series. One patch to introduce the
>>> ATA_LFLAG_NO_DEBOUNCE_DELAY flag & msleep bypass and another to add the
>>> AMD chipset.
>>>
>>> The commit message of this version patch 2 should be the explanation for
>>> the ATA_LFLAG_NO_DEBOUNCE_DELAY flag, not for adding a new chipset ID.
>>
>> Sorry, but I think you misread the patch. The flag
>> `ATA_LFLAG_NO_DB_DELAY` exists since commit e39b2bb3b7 (libata: skip
>> debounce delay on link resume).
> 
> Arg. Indeed. Ignore my comment :)
> 
> Let's wait to see if there are any more comments and I will queue this
> up for 5.17.

Thank you. In the second patch, I should have probably mentioned, that 
the flag already exists. Maybe you can amend that before applying them.

> Going forward, it would be interesting to work on reversing the default:
> no delay by default and mark all old & unknown adapters as needing the
> delay. As you mentioned, most modern AHCI adapters most likely do not
> need it.
> 
> Are you willing to take this and send a patches ?

Yes, I have it on my to-do list, but cannot promise anything.


Kind regards,

Paul


>>>> Signed-off-by: Paul Menzel <pmenzel@...gen.mpg.de>
>>>> ---
>>>>    drivers/ata/ahci_brcm.c   | 2 +-
>>>>    drivers/ata/libata-sata.c | 2 +-
>>>>    include/linux/libata.h    | 2 +-
>>>>    3 files changed, 3 insertions(+), 3 deletions(-)
>>>>
>>>> diff --git a/drivers/ata/ahci_brcm.c b/drivers/ata/ahci_brcm.c
>>>> index 6e9c5ade4c2ea..649815c196ed0 100644
>>>> --- a/drivers/ata/ahci_brcm.c
>>>> +++ b/drivers/ata/ahci_brcm.c
>>>> @@ -333,7 +333,7 @@ static struct ata_port_operations ahci_brcm_platform_ops = {
>>>>    
>>>>    static const struct ata_port_info ahci_brcm_port_info = {
>>>>    	.flags		= AHCI_FLAG_COMMON | ATA_FLAG_NO_DIPM,
>>>> -	.link_flags	= ATA_LFLAG_NO_DB_DELAY,
>>>> +	.link_flags	= ATA_LFLAG_NO_DEBOUNCE_DELAY,
>>>>    	.pio_mask	= ATA_PIO4,
>>>>    	.udma_mask	= ATA_UDMA6,
>>>>    	.port_ops	= &ahci_brcm_platform_ops,
>>>> diff --git a/drivers/ata/libata-sata.c b/drivers/ata/libata-sata.c
>>>> index b9c77885b8726..67b2e7cf3cc4e 100644
>>>> --- a/drivers/ata/libata-sata.c
>>>> +++ b/drivers/ata/libata-sata.c
>>>> @@ -317,7 +317,7 @@ int sata_link_resume(struct ata_link *link, const unsigned long *params,
>>>>    		 * immediately after resuming.  Delay 200ms before
>>>>    		 * debouncing.
>>>>    		 */
>>>> -		if (!(link->flags & ATA_LFLAG_NO_DB_DELAY))
>>>> +		if (!(link->flags & ATA_LFLAG_NO_DEBOUNCE_DELAY))
>>>>    			ata_msleep(link->ap, 200);
>>>>    
>>>>    		/* is SControl restored correctly? */
>>>> diff --git a/include/linux/libata.h b/include/linux/libata.h
>>>> index 2a8404b26083c..15802e644962d 100644
>>>> --- a/include/linux/libata.h
>>>> +++ b/include/linux/libata.h
>>>> @@ -191,7 +191,7 @@ enum {
>>>>    	ATA_LFLAG_NO_LPM	= (1 << 8), /* disable LPM on this link */
>>>>    	ATA_LFLAG_RST_ONCE	= (1 << 9), /* limit recovery to one reset */
>>>>    	ATA_LFLAG_CHANGED	= (1 << 10), /* LPM state changed on this link */
>>>> -	ATA_LFLAG_NO_DB_DELAY	= (1 << 11), /* no debounce delay on link resume */
>>>> +	ATA_LFLAG_NO_DEBOUNCE_DELAY = (1 << 11), /* no debounce delay on link resume */
>>>>    
>>>>    	/* struct ata_port flags */
>>>>    	ATA_FLAG_SLAVE_POSS	= (1 << 0), /* host supports slave dev */
>>>
>>>