linux-kernel - Re: [PATCH v5 2/2] ARM: davinci: dm365 EVM: add support for VPBE display

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Message-ID: <CA+V-a8t8cTqmLb86j1tjT0x-L4_zc-6V+ZZmJiW9xoKSvbTbvQ@mail.gmail.com>
Date:	Thu, 14 Mar 2013 14:09:18 +0530
From:	Prabhakar Lad <prabhakar.csengg@...il.com>
To:	Sekhar Nori <nsekhar@...com>
Cc:	LAK <linux-arm-kernel@...ts.infradead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	DLOS <davinci-linux-open-source@...ux.davincidsp.com>
Subject: Re: [PATCH v5 2/2] ARM: davinci: dm365 EVM: add support for VPBE display

Hi Sekhar,

On Tue, Dec 4, 2012 at 6:52 PM, Sekhar Nori <nsekhar@...com> wrote:
> On 12/3/2012 1:51 PM, Prabhakar Lad wrote:
>> From: Manjunath Hadli <manjunath.hadli@...com>
>>
>> add support for V4L2 video display to DM365 EVM.
>> Support for SD and ED modes is provided, along with Composite
>> and Component outputs.
>>
>> Signed-off-by: Manjunath Hadli <manjunath.hadli@...com>
>> Signed-off-by: Lad, Prabhakar <prabhakar.lad@...com>
>> ---
>>  arch/arm/mach-davinci/board-dm365-evm.c |  177 ++++++++++++++++++++++++++++++-
>>  1 files changed, 176 insertions(+), 1 deletions(-)
>>
>> diff --git a/arch/arm/mach-davinci/board-dm365-evm.c b/arch/arm/mach-davinci/board-dm365-evm.c
>> index 0c3dae6..10f2a85 100644
>> --- a/arch/arm/mach-davinci/board-dm365-evm.c
>> +++ b/arch/arm/mach-davinci/board-dm365-evm.c
>> @@ -27,6 +27,7 @@
>>  #include <linux/input.h>
>>  #include <linux/spi/spi.h>
>>  #include <linux/spi/eeprom.h>
>> +#include <linux/v4l2-dv-timings.h>
>>
>>  #include <asm/mach-types.h>
>>  #include <asm/mach/arch.h>
>> @@ -374,6 +375,180 @@ static struct vpfe_config vpfe_cfg = {
>>       .ccdc = "ISIF",
>>  };
>>
>> +/* venc standards timings */
>> +static struct vpbe_enc_mode_info dm365evm_enc_std_timing[] = {
>> +     {
>> +             .name           = "ntsc",
>> +             .timings_type   = VPBE_ENC_STD,
>> +             .std_id         = V4L2_STD_525_60,
>> +             .interlaced     = 1,
>> +             .xres           = 720,
>> +             .yres           = 480,
>> +             .aspect         = {11, 10},
>> +             .fps            = {30000, 1001},
>> +             .left_margin    = 0x79,
>> +             .right_margin   = 0,
>> +             .upper_margin   = 0x10,
>> +             .lower_margin   = 0,
>> +             .hsync_len      = 0,
>> +             .vsync_len      = 0,
>> +             .flags          = 0,
>
> I wonder what makes this entire information board specific? Shouldn't
> these (or at least most of these) be same across all devices which
> support NTSC and hence should be coming from some common code instead of
> being replicated for each platform that supports NTSC?
>
most of the structure members are board specific,

	struct v4l2_fract aspect;
	struct v4l2_fract fps;
	unsigned int left_margin;
	unsigned int right_margin;
	unsigned int upper_margin;
	unsigned int lower_margin;
	unsigned int hsync_len;
	unsigned int vsync_len;
	unsigned int flags;

And as of now there is no ready made structure within v4l2 which
provides the common data. So I'll be keeping this as it is.

Regards,
--Prabhakar

> Thanks,
> Sekhar
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