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net: stmmac: handle endianness in dwmac4_get_timestamp

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[ Upstream commit 224babd62d6f19581757a6d8bae3bf9501fc10de ]

GMAC IP is little-endian and used on several kind of CPU (big or little
endian). Main callbacks functions of the stmmac drivers take care about
it. It was not the case for dwmac4_get_timestamp function.

Fixes: ba1ffd74df ("stmmac: fix PTP support for GMAC4")
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alexandre Torgue
2019-02-15 10:49:09 +01:00
committed by Greg Kroah-Hartman
parent c15b7added
commit b690bf8fdb
1 changed files with 6 additions and 3 deletions
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9
drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c
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@@ -238,15 +238,18 @@ static inline u64 dwmac4_get_timestamp(void *desc, u32 ats)
static int dwmac4_rx_check_timestamp(void *desc)
{
struct dma_desc *p = (struct dma_desc *)desc;
unsigned int rdes0 = le32_to_cpu(p->des0);
unsigned int rdes1 = le32_to_cpu(p->des1);
unsigned int rdes3 = le32_to_cpu(p->des3);
u32 own, ctxt;
int ret = 1;
own = p->des3 & RDES3_OWN;
ctxt = ((p->des3 & RDES3_CONTEXT_DESCRIPTOR)
own = rdes3 & RDES3_OWN;
ctxt = ((rdes3 & RDES3_CONTEXT_DESCRIPTOR)
>> RDES3_CONTEXT_DESCRIPTOR_SHIFT);
if (likely(!own && ctxt)) {
if ((p->des0 == 0xffffffff) && (p->des1 == 0xffffffff))
if ((rdes0 == 0xffffffff) && (rdes1 == 0xffffffff))
/* Corrupted value */
ret = -EINVAL;
else