linux-kernel - Re: [PATCH 3/5 v2] [media] ov9740: Fixed some settings

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Date:	Sun, 29 May 2011 12:21:27 +0200 (CEST)
From:	Guennadi Liakhovetski <g.liakhovetski@....de>
To:	Andrew Chew <achew@...dia.com>
cc:	mchehab@...hat.com, olof@...om.net, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/5 v2] [media] ov9740: Fixed some settings

On Wed, 25 May 2011, achew@...dia.com wrote:

> From: Andrew Chew <achew@...dia.com>
> 
> Based on vendor feedback, should issue a software reset at start of day.
> 
> Also, OV9740_ANALOG_CTRL15 needs to be changed so the sensor does not begin
> streaming until it is ready (otherwise, results in a nonsense frame for the
> initial frame).
> 
> For discontinuous clocks, need to change OV9740_MIPI_CTRL00.
> 
> Finally, OV9740_ISP_CTRL19 needs to be changed to really use YUYV ordering
> (the previous value was for VYUY).
> 
> Signed-off-by: Andrew Chew <achew@...dia.com>
> ---
>  drivers/media/video/ov9740.c |   10 +++++++++-
>  1 files changed, 9 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/media/video/ov9740.c b/drivers/media/video/ov9740.c
> index d5c9061..9d7c74d 100644
> --- a/drivers/media/video/ov9740.c
> +++ b/drivers/media/video/ov9740.c
> @@ -68,6 +68,7 @@
>  #define OV9740_ANALOG_CTRL04		0x3604
>  #define OV9740_ANALOG_CTRL10		0x3610
>  #define OV9740_ANALOG_CTRL12		0x3612
> +#define OV9740_ANALOG_CTRL15		0x3615
>  #define OV9740_ANALOG_CTRL20		0x3620
>  #define OV9740_ANALOG_CTRL21		0x3621
>  #define OV9740_ANALOG_CTRL22		0x3622
> @@ -222,6 +223,9 @@ struct ov9740_priv {
>  };
>  
>  static const struct ov9740_reg ov9740_defaults[] = {
> +	/* Software Reset */
> +	{ OV9740_SOFTWARE_RESET,	0x01 },
> +
>  	/* Banding Filter */
>  	{ OV9740_AEC_B50_STEP_HI,	0x00 },
>  	{ OV9740_AEC_B50_STEP_LO,	0xe8 },
> @@ -333,6 +337,7 @@ static const struct ov9740_reg ov9740_defaults[] = {
>  	{ OV9740_ANALOG_CTRL10,		0xa1 },
>  	{ OV9740_ANALOG_CTRL12,		0x24 },
>  	{ OV9740_ANALOG_CTRL22,		0x9f },
> +	{ OV9740_ANALOG_CTRL15,		0xf0 },
>  
>  	/* Sensor Control */
>  	{ OV9740_SENSOR_CTRL03,		0x42 },
> @@ -385,7 +390,7 @@ static const struct ov9740_reg ov9740_defaults[] = {
>  	{ OV9740_LN_LENGTH_PCK_LO,	0x62 },
>  
>  	/* MIPI Control */
> -	{ OV9740_MIPI_CTRL00,		0x44 },
> +	{ OV9740_MIPI_CTRL00,		0x64 }, /* 0x44 for continuous clock */

I think, the choice between continuous and discontinuous CSI-2 clock 
should become configurable. You can only use discontinuous clock with 
hosts, that support it, right? Whereas all hosts must support continuous 
clock. So, I'm not sure we should unconditionally switch to discontinuous 
clock here... Maybe it's better to keep it continuous until we make it 
configurable?

>  	{ OV9740_MIPI_3837,		0x01 },
>  	{ OV9740_MIPI_CTRL01,		0x0f },
>  	{ OV9740_MIPI_CTRL03,		0x05 },
> @@ -393,6 +398,9 @@ static const struct ov9740_reg ov9740_defaults[] = {
>  	{ OV9740_VFIFO_RD_CTRL,		0x16 },
>  	{ OV9740_MIPI_CTRL_3012,	0x70 },
>  	{ OV9740_SC_CMMM_MIPI_CTR,	0x01 },
> +
> +	/* YUYV order */
> +	{ OV9740_ISP_CTRL19,		0x02 },
>  };
>  
>  static const struct ov9740_reg ov9740_regs_vga[] = {
> -- 
> 1.7.5.2
> 

Thanks
Guennadi
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/
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