linux-kernel - Re: [PATCH] ata: ahci: Lookup PCS register offset based on PCI device ID

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Date:   Fri, 9 Aug 2019 07:16:11 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     Stephen Douthit <stephend@...icom-usa.com>
Cc:     "linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ata: ahci: Lookup PCS register offset based on PCI device
 ID

On 8/9/19 7:13 AM, Stephen Douthit wrote:
> On 8/8/19 11:46 PM, Jens Axboe wrote:
>> On 8/8/19 1:24 PM, Stephen Douthit wrote:
>>> Intel moved the PCS register from 0x92 to 0x94 on Denverton for some
>>> reason, so now we get to check the device ID before poking it on reset.
>>>
>>> Signed-off-by: Stephen Douthit <stephend@...icom-usa.com>
>>> ---
>>>     drivers/ata/ahci.c | 42 +++++++++++++++++++++++++++++++++++++++---
>>>     1 file changed, 39 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
>>> index f7652baa6337..7090c7754fc2 100644
>>> --- a/drivers/ata/ahci.c
>>> +++ b/drivers/ata/ahci.c
>>> @@ -623,6 +623,41 @@ static void ahci_pci_save_initial_config(struct pci_dev *pdev,
>>>     	ahci_save_initial_config(&pdev->dev, hpriv);
>>>     }
>>>     
>>> +/*
>>> + * Intel moved the PCS register on the Denverton AHCI controller, see which
>>> + * offset this controller is using
>>> + */
>>> +static int ahci_pcs_offset(struct ata_host *host)
>>> +{
>>> +	struct pci_dev *pdev = to_pci_dev(host->dev);
>>> +
>>> +	switch (pdev->device) {
>>> +	case 0x19b0:
>>> +	case 0x19b1:
>>> +	case 0x19b2:
>>> +	case 0x19b3:
>>> +	case 0x19b4:
>>> +	case 0x19b5:
>>> +	case 0x19b6:
>>> +	case 0x19b7:
>>> +	case 0x19bE:
>>> +	case 0x19bF:
>>> +	case 0x19c0:
>>> +	case 0x19c1:
>>> +	case 0x19c2:
>>> +	case 0x19c3:
>>> +	case 0x19c4:
>>> +	case 0x19c5:
>>> +	case 0x19c6:
>>> +	case 0x19c7:
>>> +	case 0x19cE:
>>> +	case 0x19cF:
>>
>> Any particular reason why you made some of hex alphas upper case?
> 
> No good reason.  These were copied from the ahci_pci_tbl above and I
> didn't notice the mixed case.

Ah I see.

> I'll resend.
> 
> Would you like a separate cleanup patch for ahci_pci_tbl as well?

Yes please, I have a hard time reading the weird mixed case.

-- 
Jens Axboe