[PATCH 1/3] ARM: OMAP4: VC: fix I2C timing
Kevin Hilman
khilman at ti.com
Tue May 29 17:30:34 EDT 2012
Tero Kristo <t-kristo at ti.com> writes:
> Current I2C timing parameters do not work with Panda board at least.
> Parameters updated based on TI recommendation.
>
> Signed-off-by: Tero Kristo <t-kristo at ti.com>
Let's fix this correctly by deriving/calculating them from the proper
source clocks.
Otherwise, this is going to work for Panda and break for something else.
Kevin
> ---
> arch/arm/mach-omap2/vc.c | 4 +++-
> 1 files changed, 3 insertions(+), 1 deletions(-)
>
> diff --git a/arch/arm/mach-omap2/vc.c b/arch/arm/mach-omap2/vc.c
> index 1fd976e..a731400 100644
> --- a/arch/arm/mach-omap2/vc.c
> +++ b/arch/arm/mach-omap2/vc.c
> @@ -585,7 +585,9 @@ static void __init omap4_vc_init_channel(struct voltagedomain *voltdm)
> omap4_set_timings(voltdm, true);
>
> /* XXX These are magic numbers and do not belong! */
> - vc_val = (0x60 << OMAP4430_SCLL_SHIFT | 0x26 << OMAP4430_SCLH_SHIFT);
> + vc_val = (0x28 << OMAP4430_SCLL_SHIFT | 0x2c << OMAP4430_SCLH_SHIFT);
> + vc_val |= (0x0b << OMAP4430_HSSCLL_SHIFT);
> + vc_val |= (0x0 << OMAP4430_HSSCLH_SHIFT);
> voltdm->write(vc_val, OMAP4_PRM_VC_CFG_I2C_CLK_OFFSET);
> }
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