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| author | Kiwoong Kim <kwmad.kim@samsung.com> | 2016-09-09 01:22:22 +0200 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2016-09-21 22:28:57 +0200 |
| commit | 8794ee0c1d4ce35b8b8e4e8cdc80bba6e42206eb (patch) | |
| tree | 7e727ec4d825789f4d15d824bbdd83051804645a /drivers/scsi | |
| parent | scsi: ibmvfc: Fix I/O hang when port is not mapped (diff) | |
| download | linux-8794ee0c1d4ce35b8b8e4e8cdc80bba6e42206eb.tar.xz linux-8794ee0c1d4ce35b8b8e4e8cdc80bba6e42206eb.zip | |
scsi: ufs: Get a TM service response from the correct offset
When any UFS host controller receives a TM(Task Management) response
from a UFS device, UFS driver has been recognize like receiving a
message of "Task Management Function Complete"(00h) in all cases, so
far. That means there is no pending task for a tag of the TM request
sent before in the UFS device. That's because the byte offset 6 in TM
response which has been used to get a TM service response so far
represents just whether or not a TM transmission passes.
Regarding UFS spec, the correct byte offset to get TM service response
is 15, not 6.
I tested that UFS driver responds properly for the TM response from a
UFS device with an reference board with exynos8890, as follow: No
pending task -> Task Management Function Complete (00h) Pending task ->
Task Management Function Succeeded (08h)
[mkp: applied by hand]
Signed-off-by: Kiwoong Kim <kwmad.kim@samsung.com>
Signed-off-by: HeonGwang Chu <hg.chu@samsung.com>
Tested-by: : Kiwoong Kim <kwmad.kim@samsung.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi')
| -rw-r--r-- | drivers/scsi/ufs/ufs.h | 1 | ||||
| -rw-r--r-- | drivers/scsi/ufs/ufshcd.c | 4 |
2 files changed, 3 insertions, 2 deletions
diff --git a/drivers/scsi/ufs/ufs.h b/drivers/scsi/ufs/ufs.h index b291fa6ed2ad..845b874e2977 100644 --- a/drivers/scsi/ufs/ufs.h +++ b/drivers/scsi/ufs/ufs.h @@ -327,6 +327,7 @@ enum { MASK_QUERY_DATA_SEG_LEN = 0xFFFF, MASK_RSP_UPIU_DATA_SEG_LEN = 0xFFFF, MASK_RSP_EXCEPTION_EVENT = 0x10000, + MASK_TM_SERVICE_RESP = 0xFF, }; /* Task management service response */ diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 66f0eb80b93e..37f3c51e9d92 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -3364,8 +3364,8 @@ static int ufshcd_task_req_compl(struct ufs_hba *hba, u32 index, u8 *resp) if (ocs_value == OCS_SUCCESS) { task_rsp_upiup = (struct utp_upiu_task_rsp *) task_req_descp[index].task_rsp_upiu; - task_result = be32_to_cpu(task_rsp_upiup->header.dword_1); - task_result = ((task_result & MASK_TASK_RESPONSE) >> 8); + task_result = be32_to_cpu(task_rsp_upiup->output_param1); + task_result = task_result & MASK_TM_SERVICE_RESP; if (resp) *resp = (u8)task_result; } else { |