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bnxt_en: Fix bnxt_refclk_read()

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[ Upstream commit ddde5412fdaa5048bbca31529d46cb8da882870c ]

The upper 32-bit PHC register is not latched when reading the lower
32-bit PHC register.  Current code leaves a small window where we may
not read correct higher order bits if the lower order bits are just about
to wrap around.

This patch fixes this by reading higher order bits twice and makes
sure that final value is correctly paired with its lower 32 bits.

Fixes: 30e96f487f ("bnxt_en: Do not read the PTP PHC during chip reset")
Cc: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Pavan Chebbi
2022-07-11 22:26:18 -04:00
committed by Greg Kroah-Hartman
parent 0260a9aa5d
commit 3852f048be
1 changed files with 11 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c
View File

@@ -61,14 +61,23 @@ static int bnxt_refclk_read(struct bnxt *bp, struct ptp_system_timestamp *sts,
u64 *ns)
{
struct bnxt_ptp_cfg *ptp = bp->ptp_cfg;
u32 high_before, high_now, low;
if (test_bit(BNXT_STATE_IN_FW_RESET, &bp->state))
return -EIO;
high_before = readl(bp->bar0 + ptp->refclk_mapped_regs[1]);
ptp_read_system_prets(sts);
*ns = readl(bp->bar0 + ptp->refclk_mapped_regs[0]);
low = readl(bp->bar0 + ptp->refclk_mapped_regs[0]);
ptp_read_system_postts(sts);
*ns |= (u64)readl(bp->bar0 + ptp->refclk_mapped_regs[1]) << 32;
high_now = readl(bp->bar0 + ptp->refclk_mapped_regs[1]);
if (high_now != high_before) {
ptp_read_system_prets(sts);
low = readl(bp->bar0 + ptp->refclk_mapped_regs[0]);
ptp_read_system_postts(sts);
}
*ns = ((u64)high_now << 32) | low;
return 0;
}