From 6b8aa753a9f93c835abc140e5e33db136322d428 Mon Sep 17 00:00:00 2001 From: Sasha Neftin <sasha.neftin@intel.com> Date: Thu, 20 Jul 2023 06:48:35 +0300 Subject: [PATCH] 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: Vinicius Costa Gomes <vinicius.gomes@intel.com> Signed-off-by: Sasha Neftin <sasha.neftin@intel.com> Tested-by: Muhammad Husaini Zulkifli <muhammad.husaini.zulkifli@intel.com> Reviewed-by: Muhammad Husaini Zulkifli <muhammad.husaini.zulkifli@intel.com> Tested-by: Naama Meir <naamax.meir@linux.intel.com> Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com> --- drivers/net/ethernet/intel/igc/igc_defines.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/intel/igc/igc_defines.h b/drivers/net/ethernet/intel/igc/igc_defines.h index 700827bdd626e..b3037016f31d2 100644 --- a/drivers/net/ethernet/intel/igc/igc_defines.h +++ b/drivers/net/ethernet/intel/igc/igc_defines.h @@ -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 */ -- 2.30.2