Commit 8c0d0fe0 authored by Harini Katakam's avatar Harini Katakam Committed by Jakub Kicinski
Browse files

net: macb: Optimize reading HW timestamp 



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: default avatarHarini Katakam <harini.katakam@xilinx.com>
Signed-off-by: default avatarMichal Simek <michal.simek@xilinx.com>
Signed-off-by: default avatarRadhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent ee4e92c2

drivers/net/ethernet/cadence/macb_ptp.c

+2 −2
Original line number Diff line number Diff line
@@ -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;

}