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phy: lynx-28g: optimize read-modify-write operation

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It is unnecessary to rewrite a register if the masked field already
contains the desired value upon reading. The hardware behaviour does not
depend upon register writes with identical values.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Link: https://patch.msgid.link/20260610151952.2141019-13-vladimir.oltean@nxp.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Vladimir Oltean
2026-06-10 18:19:48 +03:00
committed by Vinod Koul
parent c6c1d7dfd5
commit f64ef1995d
1 changed files with 2 additions and 1 deletions
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3
drivers/phy/freescale/phy-fsl-lynx-core.h
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@@ -93,7 +93,8 @@ static inline void lynx_rmw(struct lynx_priv *priv, unsigned long off, u32 val,
orig = lynx_read(priv, off);
tmp = orig & ~mask;
tmp |= val;
lynx_write(priv, off, tmp);
if (orig != tmp)
lynx_write(priv, off, tmp);
}
#define lynx_lane_rmw(lane, reg, val, mask) \