linux-kernel - RE: [PATCH V7 4/6] i2c: qup: Add bam dma capabilities

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Date:	Mon, 22 Feb 2016 17:54:57 +0530
From:	"Sricharan" <sricharan@...eaurora.org>
To:	"'Wolfram Sang'" <wsa@...-dreams.de>
Cc:	<devicetree@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
	<agross@...eaurora.org>, <linux-kernel@...r.kernel.org>,
	<linux-i2c@...r.kernel.org>, <iivanov@...sol.com>,
	<galak@...eaurora.org>, <dmaengine@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <andy.gross@...aro.org>,
	<ntelkar@...eaurora.org>, <architt@...eaurora.org>
Subject: RE: [PATCH V7 4/6] i2c: qup: Add bam dma capabilities

Hi Wolfram,

> -----Original Message-----
> From: Sricharan [mailto:sricharan@...eaurora.org]
> Sent: Saturday, February 13, 2016 12:29 PM
> To: 'Wolfram Sang'
> Cc: 'devicetree@...r.kernel.org'; 'linux-arm-msm@...r.kernel.org';
> 'agross@...eaurora.org'; 'linux-kernel@...r.kernel.org'; 'linux-
> i2c@...r.kernel.org'; 'iivanov@...sol.com'; 'galak@...eaurora.org';
> 'dmaengine@...r.kernel.org'; 'linux-arm-kernel@...ts.infradead.org';
> 'andy.gross@...aro.org'; 'ntelkar@...eaurora.org';
'architt@...eaurora.org'
> Subject: RE: [PATCH V7 4/6] i2c: qup: Add bam dma capabilities
> 
> Hi Wolfram,
> 
> > -----Original Message-----
> > From: Wolfram Sang [mailto:wsa@...-dreams.de]
> > Sent: Saturday, February 13, 2016 12:08 AM
> > To: Sricharan R
> > Cc: devicetree@...r.kernel.org; linux-arm-msm@...r.kernel.org;
> > agross@...eaurora.org; linux-kernel@...r.kernel.org; linux-
> > i2c@...r.kernel.org; iivanov@...sol.com; galak@...eaurora.org;
> > dmaengine@...r.kernel.org; linux-arm-kernel@...ts.infradead.org;
> > andy.gross@...aro.org; ntelkar@...eaurora.org; architt@...eaurora.org
> > Subject: Re: [PATCH V7 4/6] i2c: qup: Add bam dma capabilities
> >
> > On Tue, Jan 19, 2016 at 03:32:44PM +0530, Sricharan R wrote:
> > > QUP cores can be attached to a BAM module, which acts as a dma
> > > engine for the QUP core. When DMA with BAM is enabled, the BAM
> > > consumer
> > pipe
> > > transmitted data is written to the output FIFO and the BAM producer
> > > pipe received data is read from the input FIFO.
> > >
> > > With BAM capabilities, qup-i2c core can transfer more than
> > > 256 bytes, without a 'stop' which is not possible otherwise.
> > >
> > > Signed-off-by: Sricharan R <sricharan@...eaurora.org>
> > > Reviewed-by: Andy Gross <andy.gross@...aro.org>
> > > Tested-by: Archit Taneja <architt@...eaurora.org>
> > > Tested-by: Telkar Nagender <ntelkar@...eaurora.org>
> >
> > My code checkers found some issues:
> >
> >     SPARSE
> > drivers/i2c/busses/i2c-qup.c:555:6: warning: symbol 'qup_sg_set_buf'
> > was not declared. Should it be static?
> > drivers/i2c/busses/i2c-qup.c:1243:50: warning: dubious: !x & !y
> >     SMATCH
> > drivers/i2c/busses/i2c-qup.c:165 qup_sg_set_buf warn: unused return: s
> > =
> > sg_next()
> > drivers/i2c/busses/i2c-qup.c:165 qup_sg_set_buf warn: unused return: s
> > =
> > sg_next()
> > drivers/i2c/busses/i2c-qup.c:1243 qup_i2c_xfer_v2() warn: add some
> > parenthesis here?
> >     CPPCHECK
> > drivers/i2c/busses/i2c-qup.c:1243: style: Boolean result is used in
> > bitwise operation. Clarify expression with parentheses.
> >     SPATCH
> > drivers/i2c/busses/i2c-qup.c:1380:2-13: WARNING: Assignment of bool to
> > 0/1
> > drivers/i2c/busses/i2c-qup.c:1481:1-13: WARNING: Assignment of bool to
> 0/1
> >   CC      drivers/i2c/busses/i2c-qup.o
> > drivers/i2c/busses/i2c-qup.c:555:6: warning: no previous prototype for
> > 'qup_sg_set_buf' [-Wmissing-prototypes]  void qup_sg_set_buf(struct
> > scatterlist *sg, void *buf, struct qup_i2c_tag *tg,
> >
> > Can you fix them and resend??
> 
  Really sorry for the delay ,  sent it here [1]

  Also, while testing this series in one of a new platform, found that an
additional 
  Regression and a fix is required on top of this series. So can I send a
separate fix on top of this series ?


[1]   https://patchwork.ozlabs.org/patch/586125/

Regards,
 Sricharan