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From: Felipe Balbi <balbi-l0cyMroinI0@public.gmane.org>
To: Shubhrajyoti Datta
	<omaplinuxkernel-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: balbi-l0cyMroinI0@public.gmane.org,
	Shubhrajyoti D <shubhrajyoti-l0cyMroinI0@public.gmane.org>,
	linux-omap-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
	ben-linux-elnMNo+KYs3YtjvyW6yDsg@public.gmane.org,
	tony-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org,
	w.sang-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org
Subject: Re: [PATCH] i2c: omap: re-factor omap_i2c_init function
Date: Tue, 23 Oct 2012 20:57:06 +0300	[thread overview]
Message-ID: <20121023175706.GC32517@arwen.pp.htv.fi> (raw)
In-Reply-To: <CAM=Q2cs-+O_BFrZFX4fuBooogEZiQO2Zxbm8W40vN9hmampLCA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>

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Hi,

On Tue, Oct 23, 2012 at 11:26:15PM +0530, Shubhrajyoti Datta wrote:
> >> @@ -1268,23 +1271,8 @@ static int omap_i2c_runtime_resume(struct device *dev)
> >>  {
> >>       struct omap_i2c_dev *_dev = dev_get_drvdata(dev);
> >>
> >> -     if (_dev->flags & OMAP_I2C_FLAG_RESET_REGS_POSTIDLE) {
> >> -             omap_i2c_write_reg(_dev, OMAP_I2C_CON_REG, 0);
> >> -             omap_i2c_write_reg(_dev, OMAP_I2C_PSC_REG, _dev->pscstate);
> >> -             omap_i2c_write_reg(_dev, OMAP_I2C_SCLL_REG, _dev->scllstate);
> >> -             omap_i2c_write_reg(_dev, OMAP_I2C_SCLH_REG, _dev->sclhstate);
> >> -             omap_i2c_write_reg(_dev, OMAP_I2C_BUF_REG, _dev->bufstate);
> >> -             omap_i2c_write_reg(_dev, OMAP_I2C_SYSC_REG, _dev->syscstate);
> >> -             omap_i2c_write_reg(_dev, OMAP_I2C_WE_REG, _dev->westate);
> >> -             omap_i2c_write_reg(_dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN);
> >> -     }
> >> -
> >> -     /*
> >> -      * Don't write to this register if the IE state is 0 as it can
> >> -      * cause deadlock.
> >> -      */
> >> -     if (_dev->iestate)
> >> -             omap_i2c_write_reg(_dev, OMAP_I2C_IE_REG, _dev->iestate);
> >
> > this part is not on __omap_i2c_init() so you're potentially causing a
> > regression here.
> 
> iestate is set at init so cannot be zero. so the check was removed.

so you never read it back ? Then you need to add a note for that in
changelog, since this is a behavior change ;-)


-- 
balbi

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WARNING: multiple messages have this Message-ID (diff)
From: balbi@ti.com (Felipe Balbi)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] i2c: omap: re-factor omap_i2c_init function
Date: Tue, 23 Oct 2012 20:57:06 +0300	[thread overview]
Message-ID: <20121023175706.GC32517@arwen.pp.htv.fi> (raw)
In-Reply-To: <CAM=Q2cs-+O_BFrZFX4fuBooogEZiQO2Zxbm8W40vN9hmampLCA@mail.gmail.com>

Hi,

On Tue, Oct 23, 2012 at 11:26:15PM +0530, Shubhrajyoti Datta wrote:
> >> @@ -1268,23 +1271,8 @@ static int omap_i2c_runtime_resume(struct device *dev)
> >>  {
> >>       struct omap_i2c_dev *_dev = dev_get_drvdata(dev);
> >>
> >> -     if (_dev->flags & OMAP_I2C_FLAG_RESET_REGS_POSTIDLE) {
> >> -             omap_i2c_write_reg(_dev, OMAP_I2C_CON_REG, 0);
> >> -             omap_i2c_write_reg(_dev, OMAP_I2C_PSC_REG, _dev->pscstate);
> >> -             omap_i2c_write_reg(_dev, OMAP_I2C_SCLL_REG, _dev->scllstate);
> >> -             omap_i2c_write_reg(_dev, OMAP_I2C_SCLH_REG, _dev->sclhstate);
> >> -             omap_i2c_write_reg(_dev, OMAP_I2C_BUF_REG, _dev->bufstate);
> >> -             omap_i2c_write_reg(_dev, OMAP_I2C_SYSC_REG, _dev->syscstate);
> >> -             omap_i2c_write_reg(_dev, OMAP_I2C_WE_REG, _dev->westate);
> >> -             omap_i2c_write_reg(_dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN);
> >> -     }
> >> -
> >> -     /*
> >> -      * Don't write to this register if the IE state is 0 as it can
> >> -      * cause deadlock.
> >> -      */
> >> -     if (_dev->iestate)
> >> -             omap_i2c_write_reg(_dev, OMAP_I2C_IE_REG, _dev->iestate);
> >
> > this part is not on __omap_i2c_init() so you're potentially causing a
> > regression here.
> 
> iestate is set at init so cannot be zero. so the check was removed.

so you never read it back ? Then you need to add a note for that in
changelog, since this is a behavior change ;-)


-- 
balbi
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  parent reply	other threads:[~2012-10-23 17:57 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-10-23 15:27 [PATCH] i2c: omap: re-factor omap_i2c_init function Shubhrajyoti D
2012-10-23 15:27 ` Shubhrajyoti D
2012-10-23 17:18 ` Felipe Balbi
2012-10-23 17:18   ` Felipe Balbi
2012-10-23 17:56   ` Shubhrajyoti Datta
2012-10-23 17:56     ` Shubhrajyoti Datta
     [not found]     ` <CAM=Q2cs-+O_BFrZFX4fuBooogEZiQO2Zxbm8W40vN9hmampLCA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-10-23 17:57       ` Felipe Balbi [this message]
2012-10-23 17:57         ` Felipe Balbi
     [not found]         ` <20121023175706.GC32517-S8G//mZuvNWo5Im9Ml3/Zg@public.gmane.org>
2012-10-23 18:04           ` Shubhrajyoti Datta
2012-10-23 18:04             ` Shubhrajyoti Datta
2012-10-25  5:57         ` Shubhrajyoti Datta
2012-10-25  5:57           ` Shubhrajyoti Datta
     [not found] ` <1351006039-24332-1-git-send-email-shubhrajyoti-l0cyMroinI0@public.gmane.org>
2012-10-23 19:11   ` Felipe Balbi
2012-10-23 19:11     ` Felipe Balbi
2012-10-25  5:32     ` Shubhrajyoti
2012-10-25  5:32       ` Shubhrajyoti

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