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authorYaniv Gardi <ygardi@codeaurora.org>2016-02-01 15:02:46 +0200
committerMartin K. Petersen <martin.petersen@oracle.com>2016-02-23 21:27:02 -0500
commitdc3c8d3a7d455859c58de8ccfaea5def6b512079 (patch)
tree7c8d28b0fecbd1ffe507ca0de18601a636b44778 /drivers/scsi/ufs
parent53c12d0ef6fcb77aaaa4640f3e17ffe2fd9cffa0 (diff)
downloadlinux-dc3c8d3a7d455859c58de8ccfaea5def6b512079.tar.bz2
scsi: ufs: retry failed query flag requests
UFS flag query requests may fail sometimes due to timeouts etc. Add a wrapper function to retry up to 10 times in case of such failure, similar to retries being made for attribute queries. Reviewed-by: Dolev Raviv <draviv@codeaurora.org> Signed-off-by: Gilad Broner <gbroner@codeaurora.org> Signed-off-by: Yaniv Gardi <ygardi@codeaurora.org> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/ufs')
-rw-r--r--drivers/scsi/ufs/ufshcd.c63
-rw-r--r--drivers/scsi/ufs/ufshcd.h4
2 files changed, 41 insertions, 26 deletions
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index da08a40c4152..87da429ab7eb 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -1660,6 +1660,29 @@ static inline void ufshcd_init_query(struct ufs_hba *hba,
(*request)->upiu_req.selector = selector;
}
+static int ufshcd_query_flag_retry(struct ufs_hba *hba,
+ enum query_opcode opcode, enum flag_idn idn, bool *flag_res)
+{
+ int ret;
+ int retries;
+
+ for (retries = 0; retries < QUERY_REQ_RETRIES; retries++) {
+ ret = ufshcd_query_flag(hba, opcode, idn, flag_res);
+ if (ret)
+ dev_dbg(hba->dev,
+ "%s: failed with error %d, retries %d\n",
+ __func__, ret, retries);
+ else
+ break;
+ }
+
+ if (ret)
+ dev_err(hba->dev,
+ "%s: query attribute, opcode %d, idn %d, failed with error %d after %d retires\n",
+ __func__, opcode, idn, ret, retries);
+ return ret;
+}
+
/**
* ufshcd_query_flag() - API function for sending flag query requests
* hba: per-adapter instance
@@ -1669,7 +1692,7 @@ static inline void ufshcd_init_query(struct ufs_hba *hba,
*
* Returns 0 for success, non-zero in case of failure
*/
-static int ufshcd_query_flag(struct ufs_hba *hba, enum query_opcode opcode,
+int ufshcd_query_flag(struct ufs_hba *hba, enum query_opcode opcode,
enum flag_idn idn, bool *flag_res)
{
struct ufs_query_req *request = NULL;
@@ -2654,17 +2677,12 @@ static int ufshcd_config_pwr_mode(struct ufs_hba *hba,
*/
static int ufshcd_complete_dev_init(struct ufs_hba *hba)
{
- int i, retries, err = 0;
+ int i;
+ int err;
bool flag_res = 1;
- for (retries = QUERY_REQ_RETRIES; retries > 0; retries--) {
- /* Set the fDeviceInit flag */
- err = ufshcd_query_flag(hba, UPIU_QUERY_OPCODE_SET_FLAG,
- QUERY_FLAG_IDN_FDEVICEINIT, NULL);
- if (!err || err == -ETIMEDOUT)
- break;
- dev_dbg(hba->dev, "%s: error %d retrying\n", __func__, err);
- }
+ err = ufshcd_query_flag_retry(hba, UPIU_QUERY_OPCODE_SET_FLAG,
+ QUERY_FLAG_IDN_FDEVICEINIT, NULL);
if (err) {
dev_err(hba->dev,
"%s setting fDeviceInit flag failed with error %d\n",
@@ -2672,18 +2690,11 @@ static int ufshcd_complete_dev_init(struct ufs_hba *hba)
goto out;
}
- /* poll for max. 100 iterations for fDeviceInit flag to clear */
- for (i = 0; i < 100 && !err && flag_res; i++) {
- for (retries = QUERY_REQ_RETRIES; retries > 0; retries--) {
- err = ufshcd_query_flag(hba,
- UPIU_QUERY_OPCODE_READ_FLAG,
- QUERY_FLAG_IDN_FDEVICEINIT, &flag_res);
- if (!err || err == -ETIMEDOUT)
- break;
- dev_dbg(hba->dev, "%s: error %d retrying\n", __func__,
- err);
- }
- }
+ /* poll for max. 1000 iterations for fDeviceInit flag to clear */
+ for (i = 0; i < 1000 && !err && flag_res; i++)
+ err = ufshcd_query_flag_retry(hba, UPIU_QUERY_OPCODE_READ_FLAG,
+ QUERY_FLAG_IDN_FDEVICEINIT, &flag_res);
+
if (err)
dev_err(hba->dev,
"%s reading fDeviceInit flag failed with error %d\n",
@@ -3430,7 +3441,7 @@ static int ufshcd_enable_auto_bkops(struct ufs_hba *hba)
if (hba->auto_bkops_enabled)
goto out;
- err = ufshcd_query_flag(hba, UPIU_QUERY_OPCODE_SET_FLAG,
+ err = ufshcd_query_flag_retry(hba, UPIU_QUERY_OPCODE_SET_FLAG,
QUERY_FLAG_IDN_BKOPS_EN, NULL);
if (err) {
dev_err(hba->dev, "%s: failed to enable bkops %d\n",
@@ -3479,7 +3490,7 @@ static int ufshcd_disable_auto_bkops(struct ufs_hba *hba)
goto out;
}
- err = ufshcd_query_flag(hba, UPIU_QUERY_OPCODE_CLEAR_FLAG,
+ err = ufshcd_query_flag_retry(hba, UPIU_QUERY_OPCODE_CLEAR_FLAG,
QUERY_FLAG_IDN_BKOPS_EN, NULL);
if (err) {
dev_err(hba->dev, "%s: failed to disable bkops %d\n",
@@ -4450,8 +4461,8 @@ static int ufshcd_probe_hba(struct ufs_hba *hba)
/* clear any previous UFS device information */
memset(&hba->dev_info, 0, sizeof(hba->dev_info));
- if (!ufshcd_query_flag(hba, UPIU_QUERY_OPCODE_READ_FLAG,
- QUERY_FLAG_IDN_PWR_ON_WPE, &flag))
+ if (!ufshcd_query_flag_retry(hba, UPIU_QUERY_OPCODE_READ_FLAG,
+ QUERY_FLAG_IDN_PWR_ON_WPE, &flag))
hba->dev_info.f_power_on_wp_en = flag;
if (!hba->is_init_prefetch)
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index 2570d9477b37..8e22e6ca588b 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -3,6 +3,7 @@
*
* This code is based on drivers/scsi/ufs/ufshcd.h
* Copyright (C) 2011-2013 Samsung India Software Operations
+ * Copyright (c) 2013-2016, The Linux Foundation. All rights reserved.
*
* Authors:
* Santosh Yaraganavi <santosh.sy@samsung.com>
@@ -681,6 +682,9 @@ static inline int ufshcd_dme_peer_get(struct ufs_hba *hba,
return ufshcd_dme_get_attr(hba, attr_sel, mib_val, DME_PEER);
}
+/* Expose Query-Request API */
+int ufshcd_query_flag(struct ufs_hba *hba, enum query_opcode opcode,
+ enum flag_idn idn, bool *flag_res);
int ufshcd_hold(struct ufs_hba *hba, bool async);
void ufshcd_release(struct ufs_hba *hba);