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staging/rdma/hfi1: Add one-time LCB reset 

Add one-time LCB reset on driver load to pre-emptively work
around any LCB power cycle issues.

Reviewed-by: Easwar Hariharan <easwar.hariharan@intel.com>
Signed-off-by: Dean Luick <dean.luick@intel.com>
Signed-off-by: Jubin John <jubin.john@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dean Luick 2015-12-01 15:38:15 -05:00 committed by Greg Kroah-Hartman
parent 92d207f315
commit bbdeb33d27
2 changed files with 23 additions and 0 deletions
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20
drivers/staging/rdma/hfi1/chip.c
View File

@ -5896,6 +5896,23 @@ void init_qsfp(struct hfi1_pportdata *ppd)
}
}
/*
* Do a one-time initialize of the LCB block.
*/
static void init_lcb(struct hfi1_devdata *dd)
{
/* the DC has been reset earlier in the driver load */
/* set LCB for cclk loopback on the port */
write_csr(dd, DC_LCB_CFG_TX_FIFOS_RESET, 0x01);
write_csr(dd, DC_LCB_CFG_LANE_WIDTH, 0x00);
write_csr(dd, DC_LCB_CFG_REINIT_AS_SLAVE, 0x00);
write_csr(dd, DC_LCB_CFG_CNT_FOR_SKIP_STALL, 0x110);
write_csr(dd, DC_LCB_CFG_CLK_CNTR, 0x08);
write_csr(dd, DC_LCB_CFG_LOOPBACK, 0x02);
write_csr(dd, DC_LCB_CFG_TX_FIFOS_RESET, 0x00);
}
int bringup_serdes(struct hfi1_pportdata *ppd)
{
struct hfi1_devdata *dd = ppd->dd;
@ -5917,6 +5934,9 @@ int bringup_serdes(struct hfi1_pportdata *ppd)
/* Set linkinit_reason on power up per OPA spec */
ppd->linkinit_reason = OPA_LINKINIT_REASON_LINKUP;
/* one-time init of the LCB */
init_lcb(dd);
if (loopback) {
ret = init_loopback(dd);
if (ret < 0)

3
drivers/staging/rdma/hfi1/chip_registers.h
View File

@ -318,6 +318,9 @@
#define DC_LCB_CFG_TX_FIFOS_RADR_RST_VAL_SHIFT 0
#define DC_LCB_CFG_TX_FIFOS_RESET (DC_LCB_CSRS + 0x000000000008)
#define DC_LCB_CFG_TX_FIFOS_RESET_VAL_SHIFT 0
#define DC_LCB_CFG_REINIT_AS_SLAVE (DC_LCB_CSRS + 0x000000000030)
#define DC_LCB_CFG_CNT_FOR_SKIP_STALL (DC_LCB_CSRS + 0x000000000040)
#define DC_LCB_CFG_CLK_CNTR (DC_LCB_CSRS + 0x000000000110)
#define DC_LCB_ERR_CLR (DC_LCB_CSRS + 0x000000000308)
#define DC_LCB_ERR_EN (DC_LCB_CSRS + 0x000000000310)
#define DC_LCB_ERR_FLG (DC_LCB_CSRS + 0x000000000300)