The dme_peer get/set attribute commands are prone to errors, therefore
we add three retries for the UIC command sending.
Error code returned from ufshcd_send_uic_cmd() is checked, and unless
it was successful or the retries have finished, another command will be
sent.
Signed-off-by: Lee Susman <lsus...@codeaurora.org>
Signed-off-by: Yaniv Gardi <yga...@codeaurora.org>
---
drivers/scsi/ufs/ufshcd.c | 40 +++++++++++++++++++++++++++++-----------
1 file changed, 29 insertions(+), 11 deletions(-)
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 217b5cf..8d5bdf0 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -69,6 +69,9 @@
/* Task management command timeout */
#define TM_CMD_TIMEOUT 100 /* msecs */
+/* maximum number of retries for a general UIC command */
+#define UFS_UIC_COMMAND_RETRIES 3
+
/* maximum number of link-startup retries */
#define DME_LINKSTARTUP_RETRIES 3
@@ -2184,6 +2187,7 @@ int ufshcd_dme_set_attr(struct ufs_hba *hba, u32 attr_sel,
};
const char *set = action[!!peer];
int ret;
+ int retries = UFS_UIC_COMMAND_RETRIES;
uic_cmd.command = peer ?
UIC_CMD_DME_PEER_SET : UIC_CMD_DME_SET;
@@ -2191,10 +2195,18 @@ int ufshcd_dme_set_attr(struct ufs_hba *hba, u32
attr_sel,
uic_cmd.argument2 = UIC_ARG_ATTR_TYPE(attr_set);
uic_cmd.argument3 = mib_val;
- ret = ufshcd_send_uic_cmd(hba, &uic_cmd);
- if (ret)
- dev_err(hba->dev, "%s: attr-id 0x%x val 0x%x error code %d\n",
- set, UIC_GET_ATTR_ID(attr_sel), mib_val, ret);
+ do {
+ /* for peer attributes we retry upon failure */
+ ret = ufshcd_send_uic_cmd(hba, &uic_cmd);
+ if (ret)
+ dev_dbg(hba->dev, "%s: attr-id 0x%x val 0x%x error code
%d\n",
+ set, UIC_GET_ATTR_ID(attr_sel), mib_val, ret);
+ } while (ret && peer && --retries);
+
+ if (!retries)
+ dev_err(hba->dev, "%s: attr-id 0x%x val 0x%x failed %d
retries\n",
+ set, UIC_GET_ATTR_ID(attr_sel), mib_val,
+ retries);
return ret;
}
@@ -2219,6 +2231,7 @@ int ufshcd_dme_get_attr(struct ufs_hba *hba, u32 attr_sel,
};
const char *get = action[!!peer];
int ret;
+ int retries = UFS_UIC_COMMAND_RETRIES;
struct ufs_pa_layer_attr orig_pwr_info;
struct ufs_pa_layer_attr temp_pwr_info;
bool pwr_mode_change = false;
@@ -2249,14 +2262,19 @@ int ufshcd_dme_get_attr(struct ufs_hba *hba, u32
attr_sel,
UIC_CMD_DME_PEER_GET : UIC_CMD_DME_GET;
uic_cmd.argument1 = attr_sel;
- ret = ufshcd_send_uic_cmd(hba, &uic_cmd);
- if (ret) {
- dev_err(hba->dev, "%s: attr-id 0x%x error code %d\n",
- get, UIC_GET_ATTR_ID(attr_sel), ret);
- goto out;
- }
+ do {
+ /* for peer attributes we retry upon failure */
+ ret = ufshcd_send_uic_cmd(hba, &uic_cmd);
+ if (ret)
+ dev_dbg(hba->dev, "%s: attr-id 0x%x error code %d\n",
+ get, UIC_GET_ATTR_ID(attr_sel), ret);
+ } while (ret && peer && --retries);
+
+ if (!retries)
+ dev_err(hba->dev, "%s: attr-id 0x%x failed %d retries\n",
+ get, UIC_GET_ATTR_ID(attr_sel), retries);
- if (mib_val)
+ if (mib_val && !ret)
*mib_val = uic_cmd.argument3;
if (peer && (hba->quirks & UFSHCD_QUIRK_DME_PEER_ACCESS_AUTO_MODE)
--
1.8.5.2
--
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