linux-kernel - Re: [PATCH 08/11] spi-dw: Ensure fifo lenght is set.

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Date:	Wed, 22 Jun 2011 21:20:11 -0700
From:	Dirk Brandewie <dirk.brandewie@...il.com>
To:	Grant Likely <grant.likely@...retlab.ca>
CC:	linux-kernel@...r.kernel.org,
	spi-devel-general@...ts.sourceforge.net
Subject: Re: [PATCH 08/11] spi-dw: Ensure fifo lenght is set.

On 06/22/2011 08:55 PM, Grant Likely wrote:
> On Wed, Jun 22, 2011 at 8:00 PM,<dirk.brandewie@...il.com>  wrote:
>> From: Dirk Brandewie<dirk.brandewie@...il.com>
>>
>> Bug on fifo_len not being set.  The fifo sizing routine does not work
>> since the txfltr register can not be written while the controller is
>> enabled. The max value of txfltr can be larger than the fifo.  The
>> register allows values upto 0x3f (63) the fifo depth on the Intel
>> SOC's if 40
>>
>> Signed-off-by: Dirk Brandewie<dirk.brandewie@...il.com>
>> ---
>>   drivers/spi/spi-dw.c |   18 ++----------------
>>   1 files changed, 2 insertions(+), 16 deletions(-)
>>
>> diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c
>> index ad92826..cc38aa0 100644
>> --- a/drivers/spi/spi-dw.c
>> +++ b/drivers/spi/spi-dw.c
>> @@ -776,25 +776,11 @@ static int destroy_queue(struct spi_dw *dws)
>>   /* Restart the controller, disable all interrupts, clean rx fifo */
>>   static void spi_dw_hw_init(struct spi_dw *dws)
>>   {
>> +       BUG_ON(!dws->fifo_len);
>> +
>
> Ditto here.  BUG is too big a reaction.  Fail to initialize the
> device, sure, and print a warning, but don't BUG.

Ack,  I was trying to make sure the bug got caught while I was working towards 
getting the rest of my changes in.

--Dirk

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