Commit 6b8aa753 authored by Sasha Neftin's avatar Sasha Neftin Committed by Tony Nguyen
Browse files

igc: Decrease PTM short interval from 10 us to 1 us 



With the 10us interval, we were seeing PTM transactions take around 12us.
Hardware team suggested this interval could be lowered to 1us which was
confirmed with PCIe sniffer. With the 1us interval, PTM dialogs took
around 2us.

Suggested-by: default avatarVinicius Costa Gomes <vinicius.gomes@intel.com>
Signed-off-by: default avatarSasha Neftin <sasha.neftin@intel.com>
Tested-by: default avatarMuhammad Husaini Zulkifli <muhammad.husaini.zulkifli@intel.com>
Reviewed-by: default avatarMuhammad Husaini Zulkifli <muhammad.husaini.zulkifli@intel.com>
Tested-by: default avatarNaama Meir <naamax.meir@linux.intel.com>
Signed-off-by: default avatarTony Nguyen <anthony.l.nguyen@intel.com>
parent 3ed247e7

drivers/net/ethernet/intel/igc/igc_defines.h

+1 −1
Original line number Diff line number Diff line
@@ -556,7 +556,7 @@ 
#define IGC_PTM_CTRL_SHRT_CYC(usec)	(((usec) & 0x3f) << 2)

#define IGC_PTM_CTRL_PTM_TO(usec)	(((usec) & 0xff) << 8)



#define IGC_PTM_SHORT_CYC_DEFAULT	10  /* Default Short/interrupted cycle interval */

#define IGC_PTM_SHORT_CYC_DEFAULT	1   /* Default short cycle interval */

#define IGC_PTM_CYC_TIME_DEFAULT	5   /* Default PTM cycle time */

#define IGC_PTM_TIMEOUT_DEFAULT		255 /* Default timeout for PTM errors */