linux-kernel - Re: [PATCH 04/10] scsi: ufs: add quirk not to allow reset of interrupt aggregation

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Message-id: <55FA7A1F.7050604@samsung.com>
Date:	Thu, 17 Sep 2015 14:00:23 +0530
From:	Alim Akhtar <alim.akhtar@...sung.com>
To:	amit daniel kachhap <amit.daniel@...sung.com>
Cc:	linux-scsi@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	vinholikatti@...il.com, JBottomley@...n.com, essuuj@...il.com
Subject: Re: [PATCH 04/10] scsi: ufs: add quirk not to allow reset of interrupt
 aggregation

Hi Amit

On 08/26/2015 11:46 AM, amit daniel kachhap wrote:
> Few comments below,
>
> On Fri, Aug 21, 2015 at 2:57 PM, Alim Akhtar <alim.akhtar@...sung.com> wrote:
>> From: Seungwon Jeon <tgih.jun@...sung.com>
>>
>> Some host controller supports interrupt aggregation, but doesn't
>> allow to reset counter and timer by s/w.
>>
>> Signed-off-by: Seungwon Jeon <tgih.jun@...sung.com>
>> Signed-off-by: Alim Akhtar <alim.akhtar@...sung.com>
>> ---
>>   drivers/scsi/ufs/ufshcd.c |    3 ++-
>>   drivers/scsi/ufs/ufshcd.h |    6 ++++++
>>   2 files changed, 8 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
>> index b441a39..35380aa 100644
>> --- a/drivers/scsi/ufs/ufshcd.c
>> +++ b/drivers/scsi/ufs/ufshcd.c
>> @@ -3204,7 +3204,8 @@ static void ufshcd_transfer_req_compl(struct ufs_hba *hba)
>>           * false interrupt if device completes another request after resetting
>>           * aggregation and before reading the DB.
>>           */
>> -       if (ufshcd_is_intr_aggr_allowed(hba))
>> +       if (ufshcd_is_intr_aggr_allowed(hba) &&
>> +           !(hba->quirks & UFSHCI_QUIRK_BROKEN_RESET_INTR_AGGR))
> How about to rename this quirk as UFSHCI_QUIRK_SKIP_RESET_INTR_AGGR as
> there are some drawbacks about the existing method also as per the
> comments above. Or this can be also put as opts instead as quirk.
Ok will rename this. Thanks
>>                  ufshcd_reset_intr_aggr(hba);
>>
>>          tr_doorbell = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);
>> diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
>> index 24245c9..7986a54 100644
>> --- a/drivers/scsi/ufs/ufshcd.h
>> +++ b/drivers/scsi/ufs/ufshcd.h
>> @@ -471,6 +471,12 @@ struct ufs_hba {
>>           */
>>          #define UFSHCI_QUIRK_BROKEN_REQ_LIST_CLR                UFS_BIT(7)
>>
>> +       /*
>> +        * This quirk needs to be enabled if host controller doesn't allow
>> +        * that the interrupt aggregation timer and counter are reset by s/w.
>> +        */
>> +       #define UFSHCI_QUIRK_BROKEN_RESET_INTR_AGGR             UFS_BIT(8)
>> +
>>          unsigned int quirks;    /* Deviations from standard UFSHCI spec. */
>>
>>          wait_queue_head_t tm_wq;
>> --
>> 1.7.10.4
>>
>> --
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