From: Dongsoo Ha <dsfine.ha@xxxxxxxxxxx>
ADC need to lock the data when read the data from register.
It is a complicated timing issue. Lock the data before start ADC and keep it.
Signed-off-by: Dongsoo Ha <dsfine.ha@xxxxxxxxxxx>
Signed-off-by: Huisung Kang <hs1218.kang@xxxxxxxxxxx>
---
arch/arm/plat-samsung/adc.c | 5 +++++
1 files changed, 5 insertions(+), 0 deletions(-)
diff --git a/arch/arm/plat-samsung/adc.c b/arch/arm/plat-samsung/adc.c index fccc644..c68d56f 100644
--- a/arch/arm/plat-samsung/adc.c
+++ b/arch/arm/plat-samsung/adc.c
@@ -224,11 +224,16 @@ int s3c_adc_read(struct s3c_adc_client *client, unsigned int ch) {
DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wake);
int ret;
+ unsigned long flags;
+
+ spin_lock_irqsave(&adc_dev->lock, flags);
client->convert_cb = s3c_convert_done;
client->wait = &wake;
client->result = -1;
+ spin_unlock_irqrestore(&adc_dev->lock, flags);
+
ret = s3c_adc_start(client, ch, 1);
if (ret < 0)
goto err;
--
1.7.1
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