linux-kernel - RE: [PATCH] ARM: i.MX35: Add set_rate and round_rate calls to csi

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Date:	Tue, 20 Mar 2012 15:57:52 +0200
From:	Alex Gershgorin <alexg@...rolight.com>
To:	'Sascha Hauer' <s.hauer@...gutronix.de>
CC:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"g.liakhovetski@....de" <g.liakhovetski@....de>,
	"fabio.estevam@...escale.com" <fabio.estevam@...escale.com>
Subject: RE: [PATCH] ARM: i.MX35: Add set_rate and round_rate calls to
	csi_clk


Hi Sascha,

Thanks for you comments.

On Tue, Mar 20, 2012 at 12:29:52PM +0200, Alex Gershgorin wrote:
> This patch add set_rate and round_rate calls to csi_clk. This is needed
> to give mx3-camera control over master clock rate to camera.

> >The file you are patching is scheduled for removal in favour for the
> >common clock framework, so you are flogging a dead horse here. I suggest
> >that you wait some time until I finished the i.MX35 patches for this.

This patch allows me to move forward, without this patch the camera just does not work. I'll use it as a temporary patch and happily wait for you to finish your work on i.MX35 patches :-)
 
> +static int csi_set_rate(struct clk *clk, unsigned long rate)
> +{
> +	unsigned long div;
> +	unsigned long parent_rate;
> +	unsigned long pdr2 = __raw_readl(CCM_BASE + CCM_PDR2);
> +
> +	if (pdr2 & (1 << 7))
> +		parent_rate = get_rate_arm();
> +	else
> +		parent_rate = get_rate_ppll();
> +
> +	div = parent_rate / rate;
> +
> +	/* Set clock divider */
> +	pdr2 |= ((div - 1) & 0x3f) << 16;

> >btw you forget to clear the divider bits in pdr2 before
> >setting the new values.

 Totally agree with you.



Regards,
Alex Gershgorin


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