From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Zubair Lutfullah : <zubair.lutfullah@gmail.com>
Cc: Lee Jones <lee.jones@linaro.org>,
Samuel Ortiz <sameo@linux.intel.com>,
Jonathan Cameron <jic23@kernel.org>,
Dmitry Torokhov <dmitry.torokhov@gmail.com>,
Felipe Balbi <balbi@ti.com>,
linux-iio@vger.kernel.org, linux-input@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 5/5] mfd: input: iio: ti_amm335x: Rework TSC/ADC synchronization
Date: Fri, 20 Dec 2013 09:55:05 +0100 [thread overview]
Message-ID: <52B405E9.2020304@linutronix.de> (raw)
In-Reply-To: <20131220033634.GB2596@gmail.com>
On 12/20/2013 04:36 AM, Zubair Lutfullah : wrote:
> Indeed, due to the separation of TSC/ADC drivers, getting
> them both to work simultaneously without fault is tricky.
The race window which leads to the lockup is (as I believe) when the
hardware is finishing its work for the TSC (pre interrupt) and the ADC
parts writes to the SE register. As long as you allow both parts to
write to the register bad things can happen (as it seems). So it does
not matter if you have two drivers or one :)
> Thanks
> Zubair
>
Sebastian
next prev parent reply other threads:[~2013-12-20 8:55 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-19 15:28 am335x: IIO/ADC fixes if used together with TSC, v2 Sebastian Andrzej Siewior
2013-12-19 15:28 ` [PATCH 1/5] iio: ti_am335x_adc: Adjust the closing bracket in tiadc_read_raw() Sebastian Andrzej Siewior
2013-12-22 16:55 ` Jonathan Cameron
2014-01-06 9:36 ` Lee Jones
2013-12-19 15:28 ` [PATCH 2/5] mfd: ti_am335x_tscadc: Make am335x_tsc_se_update() local Sebastian Andrzej Siewior
2013-12-19 17:16 ` Lee Jones
2013-12-19 15:28 ` [PATCH 3/5] mfd: ti_am335x_tscadc: Don't read back REG_SE Sebastian Andrzej Siewior
2013-12-22 17:46 ` Jonathan Cameron
2014-01-06 9:35 ` Lee Jones
2014-01-06 18:10 ` Dmitry Torokhov
2013-12-19 15:28 ` [PATCH 4/5] mfd: ti_am335x: Drop am335x_tsc_se_update() from resume path Sebastian Andrzej Siewior
2013-12-22 17:48 ` Jonathan Cameron
2013-12-19 15:28 ` [PATCH 5/5] mfd: input: iio: ti_amm335x: Rework TSC/ADC synchronization Sebastian Andrzej Siewior
2013-12-19 17:18 ` Lee Jones
2013-12-19 18:53 ` Sebastian Andrzej Siewior
2013-12-19 19:01 ` Zubair Lutfullah :
2013-12-20 8:14 ` Sebastian Andrzej Siewior
2013-12-20 3:36 ` Zubair Lutfullah :
2013-12-20 8:55 ` Sebastian Andrzej Siewior [this message]
2013-12-20 4:52 ` Zubair Lutfullah :
2013-12-22 18:03 ` Jonathan Cameron
2014-01-07 8:54 ` am335x: IIO/ADC fixes if used together with TSC, v2 Lee Jones
2014-01-08 8:03 ` Dmitry Torokhov
2014-01-08 8:08 ` Lee Jones
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