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net: dsa: microchip: Fix ksz_read64() 

[ Upstream commit c34f674c8875235725c3ef86147a627f165d23b4 ]

ksz_read64() currently does some dubious byte-swapping on the two
halves of a 64-bit register, and then only returns the high bits.
Replace this with a straightforward expression.

Fixes: e66f840c08 ("net: dsa: ksz: Add Microchip KSZ8795 DSA driver")
Signed-off-by: Ben Hutchings <ben.hutchings@mind.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Ben Hutchings 2021-08-10 00:59:12 +02:00 committed by Greg Kroah-Hartman
parent 991117eeee
commit 13a381b8bc
1 changed files with 2 additions and 6 deletions
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8
drivers/net/dsa/microchip/ksz_common.h
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@ -215,12 +215,8 @@ static inline int ksz_read64(struct ksz_device *dev, u32 reg, u64 *val)
int ret;
ret = regmap_bulk_read(dev->regmap[2], reg, value, 2);
if (!ret) {
/* Ick! ToDo: Add 64bit R/W to regmap on 32bit systems */
value[0] = swab32(value[0]);
value[1] = swab32(value[1]);
*val = swab64((u64)*value);
}
if (!ret)
*val = (u64)value[0] << 32 | value[1];
return ret;
}