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isci: Changes in COMSAS timings enabling ISCI to detect buggy disc drives.

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This patch extends timings in COMSAS signaling, so ISCI can detect disc
drives having issues to send COMSAS in correct time frame.

Signed-off-by: Andrzej Jakowski <andrzej.jakowski@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Andrzej Jakowski 2012-03-08 19:38:50 +00:00 committed by Dan Williams
parent d1dc5e2d21
commit 6119908f0f
2 changed files with 63 additions and 0 deletions
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55
drivers/scsi/isci/phy.c
View File

@ -668,6 +668,19 @@ static const char *phy_event_name(u32 event_code)
phy_to_host(iphy)->id, iphy->phy_index, \
phy_state_name(state), phy_event_name(code), code)
void scu_link_layer_set_txcomsas_timeout(struct isci_phy *iphy, u32 timeout)
{
u32 val;
/* Extend timeout */
val = readl(&iphy->link_layer_registers->transmit_comsas_signal);
val &= ~SCU_SAS_LLTXCOMSAS_GEN_VAL(NEGTIME, SCU_SAS_LINK_LAYER_TXCOMSAS_NEGTIME_MASK);
val |= SCU_SAS_LLTXCOMSAS_GEN_VAL(NEGTIME, timeout);
writel(val, &iphy->link_layer_registers->transmit_comsas_signal);
}
enum sci_status sci_phy_event_handler(struct isci_phy *iphy, u32 event_code)
{
enum sci_phy_states state = iphy->sm.current_state_id;
@ -683,6 +696,13 @@ enum sci_status sci_phy_event_handler(struct isci_phy *iphy, u32 event_code)
sci_phy_start_sata_link_training(iphy);
iphy->is_in_link_training = true;
break;
case SCU_EVENT_RECEIVED_IDENTIFY_TIMEOUT:
/* Extend timeout value */
scu_link_layer_set_txcomsas_timeout(iphy, SCU_SAS_LINK_LAYER_TXCOMSAS_NEGTIME_EXTENDED);
/* Start the oob/sn state machine over again */
sci_change_state(&iphy->sm, SCI_PHY_STARTING);
break;
default:
phy_event_dbg(iphy, state, event_code);
return SCI_FAILURE;
@ -717,9 +737,19 @@ enum sci_status sci_phy_event_handler(struct isci_phy *iphy, u32 event_code)
sci_phy_start_sata_link_training(iphy);
break;
case SCU_EVENT_LINK_FAILURE:
/* Change the timeout value to default */
scu_link_layer_set_txcomsas_timeout(iphy, SCU_SAS_LINK_LAYER_TXCOMSAS_NEGTIME_DEFAULT);
/* Link failure change state back to the starting state */
sci_change_state(&iphy->sm, SCI_PHY_STARTING);
break;
case SCU_EVENT_RECEIVED_IDENTIFY_TIMEOUT:
/* Extend the timeout value */
scu_link_layer_set_txcomsas_timeout(iphy, SCU_SAS_LINK_LAYER_TXCOMSAS_NEGTIME_EXTENDED);
/* Start the oob/sn state machine over again */
sci_change_state(&iphy->sm, SCI_PHY_STARTING);
break;
default:
phy_event_warn(iphy, state, event_code);
return SCI_FAILURE;
@ -740,7 +770,14 @@ enum sci_status sci_phy_event_handler(struct isci_phy *iphy, u32 event_code)
sci_phy_start_sata_link_training(iphy);
break;
case SCU_EVENT_RECEIVED_IDENTIFY_TIMEOUT:
/* Extend the timeout value */
scu_link_layer_set_txcomsas_timeout(iphy, SCU_SAS_LINK_LAYER_TXCOMSAS_NEGTIME_EXTENDED);
/* Start the oob/sn state machine over again */
sci_change_state(&iphy->sm, SCI_PHY_STARTING);
break;
case SCU_EVENT_LINK_FAILURE:
scu_link_layer_set_txcomsas_timeout(iphy, SCU_SAS_LINK_LAYER_TXCOMSAS_NEGTIME_DEFAULT);
case SCU_EVENT_HARD_RESET_RECEIVED:
/* Start the oob/sn state machine over again */
sci_change_state(&iphy->sm, SCI_PHY_STARTING);
@ -753,6 +790,9 @@ enum sci_status sci_phy_event_handler(struct isci_phy *iphy, u32 event_code)
case SCI_PHY_SUB_AWAIT_SAS_POWER:
switch (scu_get_event_code(event_code)) {
case SCU_EVENT_LINK_FAILURE:
/* Change the timeout value to default */
scu_link_layer_set_txcomsas_timeout(iphy, SCU_SAS_LINK_LAYER_TXCOMSAS_NEGTIME_DEFAULT);
/* Link failure change state back to the starting state */
sci_change_state(&iphy->sm, SCI_PHY_STARTING);
break;
@ -764,6 +804,9 @@ enum sci_status sci_phy_event_handler(struct isci_phy *iphy, u32 event_code)
case SCI_PHY_SUB_AWAIT_SATA_POWER:
switch (scu_get_event_code(event_code)) {
case SCU_EVENT_LINK_FAILURE:
/* Change the timeout value to default */
scu_link_layer_set_txcomsas_timeout(iphy, SCU_SAS_LINK_LAYER_TXCOMSAS_NEGTIME_DEFAULT);
/* Link failure change state back to the starting state */
sci_change_state(&iphy->sm, SCI_PHY_STARTING);
break;
@ -788,6 +831,9 @@ enum sci_status sci_phy_event_handler(struct isci_phy *iphy, u32 event_code)
case SCI_PHY_SUB_AWAIT_SATA_PHY_EN:
switch (scu_get_event_code(event_code)) {
case SCU_EVENT_LINK_FAILURE:
/* Change the timeout value to default */
scu_link_layer_set_txcomsas_timeout(iphy, SCU_SAS_LINK_LAYER_TXCOMSAS_NEGTIME_DEFAULT);
/* Link failure change state back to the starting state */
sci_change_state(&iphy->sm, SCI_PHY_STARTING);
break;
@ -836,6 +882,9 @@ enum sci_status sci_phy_event_handler(struct isci_phy *iphy, u32 event_code)
SCI_PHY_SUB_AWAIT_SIG_FIS_UF);
break;
case SCU_EVENT_LINK_FAILURE:
/* Change the timeout value to default */
scu_link_layer_set_txcomsas_timeout(iphy, SCU_SAS_LINK_LAYER_TXCOMSAS_NEGTIME_DEFAULT);
/* Link failure change state back to the starting state */
sci_change_state(&iphy->sm, SCI_PHY_STARTING);
break;
@ -859,6 +908,9 @@ enum sci_status sci_phy_event_handler(struct isci_phy *iphy, u32 event_code)
break;
case SCU_EVENT_LINK_FAILURE:
/* Change the timeout value to default */
scu_link_layer_set_txcomsas_timeout(iphy, SCU_SAS_LINK_LAYER_TXCOMSAS_NEGTIME_DEFAULT);
/* Link failure change state back to the starting state */
sci_change_state(&iphy->sm, SCI_PHY_STARTING);
break;
@ -871,6 +923,9 @@ enum sci_status sci_phy_event_handler(struct isci_phy *iphy, u32 event_code)
case SCI_PHY_READY:
switch (scu_get_event_code(event_code)) {
case SCU_EVENT_LINK_FAILURE:
/* Set default timeout */
scu_link_layer_set_txcomsas_timeout(iphy, SCU_SAS_LINK_LAYER_TXCOMSAS_NEGTIME_DEFAULT);
/* Link failure change state back to the starting state */
sci_change_state(&iphy->sm, SCI_PHY_STARTING);
break;

8
drivers/scsi/isci/registers.h
View File

@ -1239,6 +1239,14 @@ struct scu_transport_layer_registers {
#define SCU_SAS_LLCTL_GEN_BIT(name) \
SCU_GEN_BIT(SCU_SAS_LINK_LAYER_CONTROL_ ## name)
#define SCU_SAS_LINK_LAYER_TXCOMSAS_NEGTIME_DEFAULT (0xF0)
#define SCU_SAS_LINK_LAYER_TXCOMSAS_NEGTIME_EXTENDED (0x1FF)
#define SCU_SAS_LINK_LAYER_TXCOMSAS_NEGTIME_SHIFT (0)
#define SCU_SAS_LINK_LAYER_TXCOMSAS_NEGTIME_MASK (0x3FF)
#define SCU_SAS_LLTXCOMSAS_GEN_VAL(name, value) \
SCU_GEN_VALUE(SCU_SAS_LINK_LAYER_TXCOMSAS_ ## name, value)
/* #define SCU_FRXHECR_DCNT_OFFSET 0x00B0 */
#define SCU_PSZGCR_OFFSET 0x00E4