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

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Date:   Fri, 9 Aug 2019 14:13:46 +0000
From:   Stephen Douthit <stephend@...icom-usa.com>
To:     Jens Axboe <axboe@...nel.dk>
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 8/8/19 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.

I'll resend.

Would you like a separate cleanup patch for ahci_pci_tbl as well?