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Subject[PATCH 1/2] net: stmmac: Fix TX timestamp calculation
Date
When using GMAC4 the value written in PTP_SSIR should be shifted however
the shifted value is also used in subsequent calculations which results
in a bad timestamp value.

Signed-off-by: Fredrik Hallenberg <megahallon@gmail.com>
---
drivers/net/ethernet/stmicro/stmmac/stmmac_hwtstamp.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_hwtstamp.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_hwtstamp.c
index 721b61655..08c19ebd5 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_hwtstamp.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_hwtstamp.c
@@ -34,6 +34,7 @@ static u32 stmmac_config_sub_second_increment(void __iomem *ioaddr,
{
u32 value = readl(ioaddr + PTP_TCR);
unsigned long data;
+ u32 reg_value;

/* For GMAC3.x, 4.x versions, convert the ptp_clock to nano second
* formula = (1/ptp_clock) * 1000000000
@@ -50,10 +51,11 @@ static u32 stmmac_config_sub_second_increment(void __iomem *ioaddr,

data &= PTP_SSIR_SSINC_MASK;

+ reg_value = data;
if (gmac4)
- data = data << GMAC4_PTP_SSIR_SSINC_SHIFT;
+ reg_value <<= GMAC4_PTP_SSIR_SSINC_SHIFT;

- writel(data, ioaddr + PTP_SSIR);
+ writel(reg_value, ioaddr + PTP_SSIR);

return data;
}
--
2.15.1
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