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MIPS: qca956x: Fix gmac descriptor corruption issue

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tftp transfer failed as gmac descriptor got corrupted.
GMAC descriptors gets addresses from malloc area that
were already used and made free by some other module.
There is a cache invalidate issue when tftp transfer
happens and gmac descriptors gets corrupted.
flush_cache is needed to avoid this.

Change-Id: I40ae7c771bcac3fade78de4454bfa3dafde4b70a
Signed-off-by: Prabhu Jayakumar <pjayak@codeaurora.org>
This commit is contained in:
Prabhu Jayakumar 2016-05-09 18:18:41 +05:30 • committed by Gerrit - the friendly Code Review server
parent 8f7336f0a6
commit cb833dd465
1 changed files with 4 additions and 2 deletions
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6
board/qca/mips32/common/qca-eth-956x.c
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@ -538,10 +538,12 @@ static int ath_gmac_alloc_fifo(int ndesc, ath_gmac_desc_t ** fifo)
return -1;
}
/* Desc gets overwritten maliciously, this is temp WAR */
p = p+ 4096;
p = (uchar *) (((u32) p + CONFIG_SYS_CACHELINE_SIZE - 1) &
~(CONFIG_SYS_CACHELINE_SIZE - 1));
/* gmac descriptors got overwritten due to cache invalidation issue. So , flush_cache is needed here*/
flush_cache((u32)p, (sizeof(ath_gmac_desc_t) * ndesc));
p = UNCACHED_SDRAM(p);
for (i = 0; i < ndesc; i++)