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[SCSI] isci: change sas phy timeouts from 54us to 59us

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Need the following workaround in the driver for interoperability with
the older Intel SSD drives and any other SATA drive that may exhibit the
same behavior. This is a corner case where SCU speed is limited to
either 3G or 1.5G and the drive has a period of DC idle when it switches
speed during SATA speed negotiation. Workaround :change PHYTOV[31:24]
from 0x36 to 0x3B.

Signed-off-by: Marcin Tomczak <marcin.tomczak@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Marcin Tomczak 2011-07-29 17:16:50 -07:00 committed by James Bottomley
parent ee33e2b771
commit 985af6f70d
2 changed files with 25 additions and 0 deletions
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13
drivers/scsi/isci/phy.c
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@ -104,6 +104,7 @@ sci_phy_link_layer_initialization(struct isci_phy *iphy,
u32 parity_count = 0;
u32 llctl, link_rate;
u32 clksm_value = 0;
u32 sp_timeouts = 0;
iphy->link_layer_registers = reg;
@ -211,6 +212,18 @@ sci_phy_link_layer_initialization(struct isci_phy *iphy,
llctl |= SCU_SAS_LLCTL_GEN_VAL(MAX_LINK_RATE, link_rate);
writel(llctl, &iphy->link_layer_registers->link_layer_control);
sp_timeouts = readl(&iphy->link_layer_registers->sas_phy_timeouts);
/* Clear the default 0x36 (54us) RATE_CHANGE timeout value. */
sp_timeouts &= ~SCU_SAS_PHYTOV_GEN_VAL(RATE_CHANGE, 0xFF);
/* Set RATE_CHANGE timeout value to 0x3B (59us). This ensures SCU can
* lock with 3Gb drive when SCU max rate is set to 1.5Gb.
*/
sp_timeouts |= SCU_SAS_PHYTOV_GEN_VAL(RATE_CHANGE, 0x3B);
writel(sp_timeouts, &iphy->link_layer_registers->sas_phy_timeouts);
if (is_a2(ihost->pdev)) {
/* Program the max ARB time for the PHY to 700us so we inter-operate with
* the PMC expander which shuts down PHYs if the expander PHY generates too

12
drivers/scsi/isci/registers.h
View file

@ -1299,6 +1299,18 @@ struct scu_transport_layer_registers {
#define SCU_AFE_XCVRCR_OFFSET 0x00DC
#define SCU_AFE_LUTCR_OFFSET 0x00E0
#define SCU_SAS_PHY_TIMER_TIMEOUT_VALUES_ALIGN_DETECTION_SHIFT (0UL)
#define SCU_SAS_PHY_TIMER_TIMEOUT_VALUES_ALIGN_DETECTION_MASK (0x000000FFUL)
#define SCU_SAS_PHY_TIMER_TIMEOUT_VALUES_HOT_PLUG_SHIFT (8UL)
#define SCU_SAS_PHY_TIMER_TIMEOUT_VALUES_HOT_PLUG_MASK (0x0000FF00UL)
#define SCU_SAS_PHY_TIMER_TIMEOUT_VALUES_COMSAS_DETECTION_SHIFT (16UL)
#define SCU_SAS_PHY_TIMER_TIMEOUT_VALUES_COMSAS_DETECTION_MASK (0x00FF0000UL)
#define SCU_SAS_PHY_TIMER_TIMEOUT_VALUES_RATE_CHANGE_SHIFT (24UL)
#define SCU_SAS_PHY_TIMER_TIMEOUT_VALUES_RATE_CHANGE_MASK (0xFF000000UL)
#define SCU_SAS_PHYTOV_GEN_VAL(name, value) \
SCU_GEN_VALUE(SCU_SAS_PHY_TIMER_TIMEOUT_VALUES_##name, value)
#define SCU_SAS_LINK_LAYER_CONTROL_MAX_LINK_RATE_SHIFT (0)
#define SCU_SAS_LINK_LAYER_CONTROL_MAX_LINK_RATE_MASK (0x00000003)
#define SCU_SAS_LINK_LAYER_CONTROL_MAX_LINK_RATE_GEN1 (0)