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net: macb: Optimize reading HW timestamp

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The seconds input from BD (6 bits) just needs to be ORed with the
upper bits from timer in this function. Avoid addition operation
every single time. Seconds rollover handling is left untouched.

Signed-off-by: Harini Katakam <harini.katakam@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Harini Katakam 2023-04-11 18:07:12 +05:30 committed by Jakub Kicinski
parent ee4e92c26c
commit 8c0d0fe044
1 changed files with 2 additions and 2 deletions
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4
drivers/net/ethernet/cadence/macb_ptp.c
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@ -258,6 +258,8 @@ static int gem_hw_timestamp(struct macb *bp, u32 dma_desc_ts_1,
*/
gem_tsu_get_time(&bp->ptp_clock_info, &tsu, NULL);
ts->tv_sec |= ((~GEM_DMA_SEC_MASK) & tsu.tv_sec);
/* If the top bit is set in the timestamp,
* but not in 1588 timer, it has rolled over,
* so subtract max size
@ -266,8 +268,6 @@ static int gem_hw_timestamp(struct macb *bp, u32 dma_desc_ts_1,
!(tsu.tv_sec & (GEM_DMA_SEC_TOP >> 1)))
ts->tv_sec -= GEM_DMA_SEC_TOP;
ts->tv_sec += ((~GEM_DMA_SEC_MASK) & tsu.tv_sec);
return 0;
}