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regmap: spi: Handle async writes of only one buffer

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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>
This commit is contained in:
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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drivers/base/regmap/regmap-spi.c
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@ -73,6 +73,7 @@ static int regmap_spi_async_write(void *context,
spi_message_init(&async->m); spi_message_init(&async->m);
spi_message_add_tail(&async->t[0], &async->m); spi_message_add_tail(&async->t[0], &async->m);
if (val)
spi_message_add_tail(&async->t[1], &async->m); spi_message_add_tail(&async->t[1], &async->m);
async->m.complete = regmap_spi_complete; async->m.complete = regmap_spi_complete;