From mboxrd@z Thu Jan 1 00:00:00 1970 From: Heiko =?ISO-8859-1?Q?St=FCbner?= Subject: Re: [PATCH] i2c: rk3x: fix interrupt handling issue Date: Fri, 08 Aug 2014 12:15:11 +0200 Message-ID: <1676136.zY2YY7tt5d@diego> References: <1407490900-4718-1-git-send-email-addy.ke@rock-chips.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7Bit Return-path: In-Reply-To: <1407490900-4718-1-git-send-email-addy.ke@rock-chips.com> Sender: linux-kernel-owner@vger.kernel.org To: Addy Ke Cc: wsa@the-dreams.de, max.schwarz@online.de, olof@lixom.net, dianders@chromium.org, linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, cf@rock-chips.com, xjq@rock-chips.com, huangtao@rock-chips.com, zyw@rock-chips.com, yzq@rock-chips.com, hj@rock-chips.com, kever.yang@rock-chips.com, hl@rock-chips.com, caesar.wang@rock-chips.com, zhengsq@rock-chips.com List-Id: linux-i2c@vger.kernel.org Am Freitag, 8. August 2014, 17:41:40 schrieb Addy Ke: > If slave holds scl, I2C_IPD[7] will be set 1 by controller > for debugging. Driver must ignore it. > > [ 5.752391] rk3x-i2c ff160000.i2c: unexpected irq in WRITE: 0x80 > [ 5.939027] rk3x-i2c ff160000.i2c: timeout, ipd: 0x80, state: 4 > > Signed-off-by: Addy Ke I checked the manuals, bits [31:7] are marked as reserved in all of them, so Reviewed-by: Heiko Stuebner > --- > drivers/i2c/busses/i2c-rk3x.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/i2c/busses/i2c-rk3x.c b/drivers/i2c/busses/i2c-rk3x.c > index 9e3084c..eab49e6 100644 > --- a/drivers/i2c/busses/i2c-rk3x.c > +++ b/drivers/i2c/busses/i2c-rk3x.c > @@ -399,7 +399,7 @@ static irqreturn_t rk3x_i2c_irq(int irqno, void *dev_id) > } > > /* is there anything left to handle? */ > - if (unlikely(ipd == 0)) > + if (unlikely((ipd & REG_INT_ALL) == 0)) > goto out; > > switch (i2c->state) {