linux-kernel - Re: [PATCH v2 1/3] i2c: cadence: Handle

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Message-ID: <66a490c827bc47d98a0118a58d7060e7@BN1BFFO11FD054.protection.gbl>
Date:	Fri, 5 Dec 2014 09:15:29 +0100
From:	Michal Simek <michal.simek@...inx.com>
To:	rajeev kumar <rajeevkumar.linux@...il.com>,
	Harini Katakam <harinik@...inx.com>
CC:	<wsa@...-dreams.de>, <mark.rutland@....com>,
	<michal.simek@...inx.com>, <soren.brinkmann@...inx.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-i2c@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	<vishnum@...inx.com>, <harinikatakamlinux@...il.com>
Subject: Re: [PATCH v2 1/3] i2c: cadence: Handle > 252 byte transfers

On 12/05/2014 06:41 AM, rajeev kumar wrote:
> On Wed, Dec 3, 2014 at 6:05 PM, Harini Katakam <harinik@...inx.com> wrote:
>> The I2C controller sends a NACK to the slave when transfer size register
>> reaches zero, irrespective of the hold bit. So, in order to handle transfers
>> greater than 252 bytes, the transfer size register has to be maintained at a
>> value >= 1. This patch implements the same.
> 
> Why 252 Bytes ?  Is it word allign or what ?
> 
>> The interrupt status is cleared at the beginning of the isr instead of
>> the end, to avoid missing any interrupts - this is in sync with the new
>> transfer handling.
>>
> 
> No need to write this, actually this is the correct way of handling interrupt.
> 
>> Signed-off-by: Harini Katakam <harinik@...inx.com>
>> ---
>>
>> v2:
>> No changes
>>
>> ---
>>  drivers/i2c/busses/i2c-cadence.c |  156 ++++++++++++++++++++------------------
>>  1 file changed, 81 insertions(+), 75 deletions(-)
>>
>> diff --git a/drivers/i2c/busses/i2c-cadence.c b/drivers/i2c/busses/i2c-cadence.c
>> index 63f3f03..e54899e 100644
>> --- a/drivers/i2c/busses/i2c-cadence.c
>> +++ b/drivers/i2c/busses/i2c-cadence.c
>> @@ -126,6 +126,7 @@
>>   * @suspended:         Flag holding the device's PM status
>>   * @send_count:                Number of bytes still expected to send
>>   * @recv_count:                Number of bytes still expected to receive
>> + * @curr_recv_count:   Number of bytes to be received in current transfer
> 
> Please do the alignment properly

Alignments are correct when you apply this patch.
Please let us know if you see any problem.

Thanks,
Michal

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