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regmap: spi: Handle async writes of only one buffer 

If the value is zero then assume it has been included in the register data
and don't send anything, minimising the number of interactions with the
hardware.

Signed-off-by: Mark Brown <broonie@linaro.org>
hifive-unleashed-5.1
Mark Brown 2013-10-10 22:25:23 +01:00
parent 7ccda98393
commit cd1b9dd022
1 changed files with 2 additions and 1 deletions
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3
drivers/base/regmap/regmap-spi.c
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@ -73,7 +73,8 @@ static int regmap_spi_async_write(void *context,
spi_message_init(&async->m);
spi_message_add_tail(&async->t[0], &async->m);
spi_message_add_tail(&async->t[1], &async->m);
if (val)
spi_message_add_tail(&async->t[1], &async->m);
async->m.complete = regmap_spi_complete;
async->m.context = async;