[PATCH] ARM: SAMSUNG: Add locking sequence for nomal mode
From: Huisung Kang <hidden>
Date: 2012-02-11 02:53:31
Also in:
linux-samsung-soc
From: Dongsoo Ha <redacted> 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 <redacted> Signed-off-by: Huisung Kang <redacted> --- 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