Re: [PATCH] i2c: i2c-omap: Fix BUFSTAT_REG reading

[Tony Lindgren <tony@atomide.com>]

* ext-eero.nurkkala@nokia.com <ext-eero.nurkkala@nokia.com> [081125 13:04]:
> From: Eero Nurkkala <ext-eero.nurkkala@nokia.com>
> 
> The number of bytes to be received is read from wrong
> place with all OMAPs with highspeed I2C support,
> which involves a FIFO and BUFSTAT_REG. It is the 6
> bits starting from the bit 8 in the BUFSTAT_REG
> that indicate this amount of bytes to be read.
> Moreover, only the 6 LSB:s are relevant for the 
> TXSTAT field. 

Pushing to l-o tree and adding to omap-fixes queue.

Tony

> Signed-off-by: Eero Nurkkala <ext-eero.nurkkala@nokia.com>
> ---
>  drivers/i2c/busses/i2c-omap.c |   10 ++++++----
>  1 files changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
> index 96f3bed..71b37ed 100644
> --- a/drivers/i2c/busses/i2c-omap.c
> +++ b/drivers/i2c/busses/i2c-omap.c
> @@ -675,8 +675,9 @@ omap_i2c_isr(int this_irq, void *dev_id)
>  				if (stat & OMAP_I2C_STAT_RRDY)
>  					num_bytes = dev->fifo_size;
>  				else
> -					num_bytes = omap_i2c_read_reg(dev,
> -							OMAP_I2C_BUFSTAT_REG);
> +					num_bytes = (omap_i2c_read_reg(dev,
> +							OMAP_I2C_BUFSTAT_REG)
> +							>> 8) & 0x3F;
>  			}
>  			while (num_bytes) {
>  				num_bytes--;
> @@ -714,8 +715,9 @@ omap_i2c_isr(int this_irq, void *dev_id)
>  				if (stat & OMAP_I2C_STAT_XRDY)
>  					num_bytes = dev->fifo_size;
>  				else
> -					num_bytes = omap_i2c_read_reg(dev,
> -							OMAP_I2C_BUFSTAT_REG);
> +					num_bytes = (omap_i2c_read_reg(dev,
> +							OMAP_I2C_BUFSTAT_REG))
> +							& 0x3F;
>  			}
>  			while (num_bytes) {
>  				num_bytes--;
> -- 
> 1.6.0
> 
> --
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