linux-kernel - Re: [PATCH 05/15] media: blackfin: bfin_capture: improve queue

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Message-ID: <CA+V-a8sAFPabRRUUwfZUG4zW-YYKKj5SfoLJ0ptVn=x4qNrGxw@mail.gmail.com>
Date:	Wed, 21 Jan 2015 11:29:29 +0000
From:	"Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:	Scott Jiang <scott.jiang.linux@...il.com>
Cc:	LMML <linux-media@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	adi-buildroot-devel@...ts.sourceforge.net,
	Mauro Carvalho Chehab <m.chehab@...sung.com>
Subject: Re: [PATCH 05/15] media: blackfin: bfin_capture: improve
 queue_setup() callback

On Wed, Jan 21, 2015 at 10:01 AM, Scott Jiang
<scott.jiang.linux@...il.com> wrote:
> 2014-12-20 18:47 GMT+08:00 Lad, Prabhakar <prabhakar.csengg@...il.com>:
>> this patch improves the queue_setup() callback.
>>
>> Signed-off-by: Lad, Prabhakar <prabhakar.csengg@...il.com>
>> ---
>>  drivers/media/platform/blackfin/bfin_capture.c | 10 ++++++----
>>  1 file changed, 6 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/media/platform/blackfin/bfin_capture.c b/drivers/media/platform/blackfin/bfin_capture.c
>> index 8bd94a1..76d42bb 100644
>> --- a/drivers/media/platform/blackfin/bfin_capture.c
>> +++ b/drivers/media/platform/blackfin/bfin_capture.c
>> @@ -44,7 +44,6 @@
>>  #include <media/blackfin/ppi.h>
>>
>>  #define CAPTURE_DRV_NAME        "bfin_capture"
>> -#define BCAP_MIN_NUM_BUF        2
>>
>>  struct bcap_format {
>>         char *desc;
>> @@ -292,11 +291,14 @@ static int bcap_queue_setup(struct vb2_queue *vq,
>>  {
>>         struct bcap_device *bcap_dev = vb2_get_drv_priv(vq);
>>
>> -       if (*nbuffers < BCAP_MIN_NUM_BUF)
>> -               *nbuffers = BCAP_MIN_NUM_BUF;
>> +       if (fmt && fmt->fmt.pix.sizeimage < bcap_dev->fmt.sizeimage)
>> +               return -EINVAL;
>> +
>> +       if (vq->num_buffers + *nbuffers < 3)
>> +               *nbuffers = 3 - vq->num_buffers;
>
> It seems it changes the minimum buffers from 2 to 3?
>
will replace it with,

if (vq->num_buffers + *nbuffers < 2)
       *nbuffers = 2;

Thanks,
--Prabhakar Lad
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