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SubjectRe: [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@samsung.com> wrote:
>> From: Seungwon Jeon <tgih.jun@samsung.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@samsung.com>
>> Signed-off-by: Alim Akhtar <alim.akhtar@samsung.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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>


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