linux-kernel - Re: [PATCH] i2c-designware: Mask interrupts during i2c controller enable

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Message-ID: <20140405061316.GF19349@intel.com>
Date:	Sat, 5 Apr 2014 09:13:16 +0300
From:	"Westerberg, Mika" <mika.westerberg@...el.com>
To:	"Du, Wenkai" <wenkai.du@...el.com>
Cc:	"linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
	Wolfram Sang <wsa@...-dreams.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] i2c-designware: Mask interrupts during i2c controller
 enable

On Sat, Apr 05, 2014 at 12:54:33AM +0300, Du, Wenkai wrote:
> >Interrupt masking is done already after each transaction.
> 
> At end of transfer, the code uses __i2c_dw_enable(dev, false) to disable
> adapter. This function doesn't mask interrupts. There is another function
> i2c_dw_disable that masks and clears interrupts. This could be used, but
> that means we need to fix in 2 places: 

Please check i2c_dw_isr() and tell me in which code path interrupts are not
getting masked. Or am I missing something fundamental here?

In case of abort, we mask interrupts. Also whenever the transaction
completes we mask interrupts (in i2c_dw_xfer_msg()).

Only place where we didn't do that, as far as I can tell, is right after
reset because of the HW default value that unmasks most of them.
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