linux-kernel - Re: [PATCH v3 1/3] davinci: vpss: dm365: enable ISP registers

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Message-ID: <20121128200854.GH31879@valkosipuli.retiisi.org.uk>
Date:	Wed, 28 Nov 2012 22:08:54 +0200
From:	Sakari Ailus <sakari.ailus@....fi>
To:	Prabhakar Lad <prabhakar.csengg@...il.com>
Cc:	LMML <linux-media@...r.kernel.org>,
	Mauro Carvalho Chehab <mchehab@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	DLOS <davinci-linux-open-source@...ux.davincidsp.com>,
	Manjunath Hadli <manjunath.hadli@...com>,
	Prabhakar Lad <prabhakar.lad@...com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Hans Verkuil <hans.verkuil@...co.com>
Subject: Re: [PATCH v3 1/3] davinci: vpss: dm365: enable ISP registers

On Wed, Nov 28, 2012 at 04:25:32PM +0530, Prabhakar Lad wrote:
> From: Manjunath Hadli <manjunath.hadli@...com>
> 
> enable PPCR, enbale ISIF out on BCR and disable all events to
> get the correct operation from ISIF.
> 
> Signed-off-by: Manjunath Hadli <manjunath.hadli@...com>
> Signed-off-by: Lad, Prabhakar <prabhakar.lad@...com>
> ---
>  drivers/media/platform/davinci/vpss.c |   13 +++++++++++++
>  1 files changed, 13 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/media/platform/davinci/vpss.c b/drivers/media/platform/davinci/vpss.c
> index 146e4b0..34ad7bd 100644
> --- a/drivers/media/platform/davinci/vpss.c
> +++ b/drivers/media/platform/davinci/vpss.c
> @@ -52,9 +52,11 @@ MODULE_AUTHOR("Texas Instruments");
>  #define DM355_VPSSBL_EVTSEL_DEFAULT	0x4
>  
>  #define DM365_ISP5_PCCR 		0x04
> +#define DM365_ISP5_BCR			0x08
>  #define DM365_ISP5_INTSEL1		0x10
>  #define DM365_ISP5_INTSEL2		0x14
>  #define DM365_ISP5_INTSEL3		0x18
> +#define DM365_ISP5_EVTSEL		0x1c
>  #define DM365_ISP5_CCDCMUX 		0x20
>  #define DM365_ISP5_PG_FRAME_SIZE 	0x28
>  #define DM365_VPBE_CLK_CTRL 		0x00
> @@ -357,6 +359,10 @@ void dm365_vpss_set_pg_frame_size(struct vpss_pg_frame_size frame_size)
>  }
>  EXPORT_SYMBOL(dm365_vpss_set_pg_frame_size);
>  
> +#define DM365_ISP5_EVTSEL_EVT_DISABLE	0x00000000
> +#define DM365_ISP5_BCR_ISIF_OUT_ENABLE	0x00000002
> +#define DM365_ISP5_PCCR_CLK_ENABLE	0x0000007f
> +

How about defining these next to the register definitions themselves? There
also seems to be one EVTSEL bit defined in the beginning of the first chunk.
Please group these.

For that matter --- IMO you could just write zero to the register, without
defining it a name, if the purpose of the register is to select something
based on bits that are set.

>  static int __devinit vpss_probe(struct platform_device *pdev)
>  {
>  	struct resource		*r1, *r2;
> @@ -426,9 +432,16 @@ static int __devinit vpss_probe(struct platform_device *pdev)
>  		oper_cfg.hw_ops.enable_clock = dm365_enable_clock;
>  		oper_cfg.hw_ops.select_ccdc_source = dm365_select_ccdc_source;
>  		/* Setup vpss interrupts */
> +		isp5_write((isp5_read(DM365_ISP5_PCCR) |
> +				DM365_ISP5_PCCR_CLK_ENABLE), DM365_ISP5_PCCR);
> +		isp5_write((isp5_read(DM365_ISP5_BCR) |
> +			     DM365_ISP5_BCR_ISIF_OUT_ENABLE), DM365_ISP5_BCR);
>  		isp5_write(DM365_ISP5_INTSEL1_DEFAULT, DM365_ISP5_INTSEL1);
>  		isp5_write(DM365_ISP5_INTSEL2_DEFAULT, DM365_ISP5_INTSEL2);
>  		isp5_write(DM365_ISP5_INTSEL3_DEFAULT, DM365_ISP5_INTSEL3);
> +		/* No event selected */
> +		isp5_write((isp5_read(DM365_ISP5_EVTSEL) |
> +			DM365_ISP5_EVTSEL_EVT_DISABLE), DM365_ISP5_EVTSEL);

What's this? You're reading the value of the register, orring that with zero
and writing it back? :-)

>  	} else
>  		oper_cfg.hw_ops.clear_wbl_overflow = dm644x_clear_wbl_overflow;
>  

-- 
Regards,

Sakari Ailus
e-mail: sakari.ailus@....fi	XMPP: sailus@...iisi.org.uk
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