* Aaro Koskinen <aaro.koskinen@xxxxxxxxx> [090527 07:55]:
> Use longer noise filter period for fast and standard mode. Based on an
> earlier patch by Eero Nurkkala.
>
> Signed-off-by: Aaro Koskinen <aaro.koskinen@xxxxxxxxx>
Ben this should be queued too.
Acked-by: Tony Lindgren <tony@xxxxxxxxxxx>
> ---
> drivers/i2c/busses/i2c-omap.c | 14 ++++++++++++--
> 1 files changed, 12 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
> index 5d9880c..8c76cea 100644
> --- a/drivers/i2c/busses/i2c-omap.c
> +++ b/drivers/i2c/busses/i2c-omap.c
> @@ -333,8 +333,18 @@ static int omap_i2c_init(struct omap_i2c_dev *dev)
>
> if (cpu_is_omap2430() || cpu_is_omap34xx()) {
>
> - /* HSI2C controller internal clk rate should be 19.2 Mhz */
> - internal_clk = 19200;
> + /*
> + * HSI2C controller internal clk rate should be 19.2 Mhz for
> + * HS and for all modes on 2430. On 34xx we can use lower rate
> + * to get longer filter period for better noise suppression.
> + * The filter is iclk (fclk for HS) period.
> + */
> + if (dev->speed > 400 || cpu_is_omap_2430())
> + internal_clk = 19200;
> + else if (dev->speed > 100)
> + internal_clk = 9600;
> + else
> + internal_clk = 4000;
> fclk_rate = clk_get_rate(dev->fclk) / 1000;
>
> /* Compute prescaler divisor */
> --
> 1.5.4.3
>
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