This is a note to let you know that I've just added the patch titled
iio/adc: ingenic: Fix AUX/VBAT readings when touchscreen is used
to the 5.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
iio-adc-ingenic-fix-aux-vbat-readings-when-touchscreen-is-used.patch
and it can be found in the queue-5.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 6d6aa2907d59ddd3c0ebb2b93e1ddc84e474485b Mon Sep 17 00:00:00 2001
From: Paul Cercueil <paul@xxxxxxxxxxxxxxx>
Date: Tue, 3 Nov 2020 20:12:38 +0000
Subject: iio/adc: ingenic: Fix AUX/VBAT readings when touchscreen is used
From: Paul Cercueil <paul@xxxxxxxxxxxxxxx>
commit 6d6aa2907d59ddd3c0ebb2b93e1ddc84e474485b upstream.
When the command feature of the ADC is used, it is possible to program
the ADC, and specify at each step what input should be processed, and in
comparison to what reference.
This broke the AUX and battery readings when the touchscreen was
enabled, most likely because the CMD feature would change the VREF all
the time.
Now, when AUX or battery are read, we temporarily disable the CMD
feature, which means that we won't get touchscreen readings in that time
frame. But it now gives correct values for AUX / battery, and the
touchscreen isn't disabled for long enough to be an actual issue.
Fixes: b96952f498db ("IIO: Ingenic JZ47xx: Add touchscreen mode.")
Signed-off-by: Paul Cercueil <paul@xxxxxxxxxxxxxxx>
Acked-by: Artur Rojek <contact@xxxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20201103201238.161083-1-paul@xxxxxxxxxxxxxxx
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/iio/adc/ingenic-adc.c | 32 ++++++++++++++++++++++++++------
1 file changed, 26 insertions(+), 6 deletions(-)
--- a/drivers/iio/adc/ingenic-adc.c
+++ b/drivers/iio/adc/ingenic-adc.c
@@ -177,13 +177,12 @@ static void ingenic_adc_set_config(struc
mutex_unlock(&adc->lock);
}
-static void ingenic_adc_enable(struct ingenic_adc *adc,
- int engine,
- bool enabled)
+static void ingenic_adc_enable_unlocked(struct ingenic_adc *adc,
+ int engine,
+ bool enabled)
{
u8 val;
- mutex_lock(&adc->lock);
val = readb(adc->base + JZ_ADC_REG_ENABLE);
if (enabled)
@@ -192,20 +191,41 @@ static void ingenic_adc_enable(struct in
val &= ~BIT(engine);
writeb(val, adc->base + JZ_ADC_REG_ENABLE);
+}
+
+static void ingenic_adc_enable(struct ingenic_adc *adc,
+ int engine,
+ bool enabled)
+{
+ mutex_lock(&adc->lock);
+ ingenic_adc_enable_unlocked(adc, engine, enabled);
mutex_unlock(&adc->lock);
}
static int ingenic_adc_capture(struct ingenic_adc *adc,
int engine)
{
+ u32 cfg;
u8 val;
int ret;
- ingenic_adc_enable(adc, engine, true);
+ /*
+ * Disable CMD_SEL temporarily, because it causes wrong VBAT readings,
+ * probably due to the switch of VREF. We must keep the lock here to
+ * avoid races with the buffer enable/disable functions.
+ */
+ mutex_lock(&adc->lock);
+ cfg = readl(adc->base + JZ_ADC_REG_CFG);
+ writel(cfg & ~JZ_ADC_REG_CFG_CMD_SEL, adc->base + JZ_ADC_REG_CFG);
+
+ ingenic_adc_enable_unlocked(adc, engine, true);
ret = readb_poll_timeout(adc->base + JZ_ADC_REG_ENABLE, val,
!(val & BIT(engine)), 250, 1000);
if (ret)
- ingenic_adc_enable(adc, engine, false);
+ ingenic_adc_enable_unlocked(adc, engine, false);
+
+ writel(cfg, adc->base + JZ_ADC_REG_CFG);
+ mutex_unlock(&adc->lock);
return ret;
}
Patches currently in stable-queue which might be from paul@xxxxxxxxxxxxxxx are
queue-5.9/iio-adc-ingenic-fix-aux-vbat-readings-when-touchscreen-is-used.patch
queue-5.9/iio-adc-ingenic-fix-battery-vref-for-jz4770-soc.patch
