mfd: ab8500-gpadc: Reread on failure

Reread the gpadc once upon failure.

Signed-off-by: Jonas Aaberg <jonas.aberg@stericsson.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Reviewed-by: Mattias WALLIN <mattias.wallin@stericsson.com>
Acked-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/mfd/ab8500-gpadc.c b/drivers/mfd/ab8500-gpadc.c
index 9ed3afc31d11..7f39479c1afc 100644
--- a/drivers/mfd/ab8500-gpadc.c
+++ b/drivers/mfd/ab8500-gpadc.c
@@ -256,6 +256,11 @@ int ab8500_gpadc_convert(struct ab8500_gpadc *gpadc, u8 channel)
         int voltage;
 
         ad_value = ab8500_gpadc_read_raw(gpadc, channel);
+
+        /* On failure retry a second time */
+        if (ad_value < 0)
+                ad_value = ab8500_gpadc_read_raw(gpadc, channel);
+
         if (ad_value < 0) {
                 dev_err(gpadc->dev, "GPADC raw value failed ch: %d\n", channel);
                 return ad_value;