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sunxi: pmic_bus: Decrease boot time by not writing duplicate data

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When we clear a pmic_bus bit, we do a read-modify-write operation.
We waste some time however, by writing back the exact samea value
that was already set in the chip. Let us thus only do the write
in case data was changed.

Signed-off-by: Olliver Schinagl <oliver@schinagl.nl>
Signed-off-by: Priit Laes <plaes@plaes.org>
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
This commit is contained in:
Olliver Schinagl 2018-11-21 20:05:26 +02:00 committed by Jagan Teki
parent a8011eb84d
commit c970e8954f
1 changed files with 6 additions and 0 deletions
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6
arch/arm/mach-sunxi/pmic_bus.c
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@ -101,6 +101,9 @@ int pmic_bus_setbits(u8 reg, u8 bits)
if (ret)
return ret;
if ((val & bits) == bits)
return 0;
val |= bits;
return pmic_bus_write(reg, val);
}
@ -114,6 +117,9 @@ int pmic_bus_clrbits(u8 reg, u8 bits)
if (ret)
return ret;
if (!(val & bits))
return 0;
val &= ~bits;
return pmic_bus_write(reg, val);
}