Re: [PATCH REBASE 1/2] i2c: tegra: I2_M_NOSTART functionality not supported in Tegra20

[Laxman Dewangan <ldewangan@xxxxxxxxxx>]

Thanks for review.

On Saturday 18 August 2012 06:17 PM, Wolfram Sang wrote:
> * PGP Signed by an unknown key
>
> On Sat, Aug 18, 2012 at 12:32:34AM +0530, Laxman Dewangan wrote:
> > +	bool has_continue_xfer_support;
> I wonder if it makes sense to carry a pointer here to the
> tegra_i2c_hw_feature in use instead of copying all entries by hand,
> since they might get more and more.

Ok, we can store the hw pointer in device structure. I will send the new 
patch.

> >   };
> >
> >   static void dvc_writel(struct tegra_i2c_dev *i2c_dev, u32 val, unsigned long reg)
> > @@ -563,7 +574,17 @@ static int tegra_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[],
> >   	if (i2c_dev->is_suspended)
> >   		return -EBUSY;
> >
> > -	clk_prepare_enable(i2c_dev->div_clk);
> > +	/* Support I2C_M_NOSTART only if HW support continue xfer. */
> > +	for (i = 0; i<  num - 1; i++) {
> > +		if ((msgs[i + 1].flags&  I2C_M_NOSTART)&&
> > +			!i2c_dev->has_continue_xfer_support) {
> > +			dev_err(i2c_dev->dev,
> > +				"mesg %d have illegal flag\n", i + 1);
> > +			return -EINVAL;
> > +		}
> > +	}
> Drivers are requested to explicitly check for features of the I2C bus
> (like M_NOSTART) before using them, so I'd skip this extra check.

Ok, I kept this as part of flag checking so illegal flag should not be 
passed. I will remove this on next version patch.

> > +
> > +	clk_prepare_enable(i2c_dev->clk);
>  From a glimpse, this change looks unrelated at least. Even wrong, no?

It was already there, just before above check. Due to insertion of 
check, this code shifted, otherwise it is not a new code.

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