Subject: Re: [PATCH 1/2] can: rcar_can: Add r8a7795 support

From: Marc Kleine-Budde <[email-masked]>
Date: Mon, 29 Feb 2016 13:47:04 +0100

On 02/29/2016 11:00 AM, Marc Kleine-Budde wrote:
> I think it's better to fix the algorithm. I'll look into it.

What about:

> ./can-calc-bit-timing -c 39999998 rcar_can                                                         
> Bit timing parameters for rcar_can with 39.999998 MHz ref clock
> nominal                                 real Bitrt   nom  real SampP
> Bitrate TQ[ns] PrS PhS1 PhS2 SJW BRP Bitrate Error SampP SampP Error      CiBCR
> 1000000    125   2    3    2   1   5  999999  0.0% 75.0% 75.0%  0.0% 0x40040100
>  800000    125   3    4    2   1   5  799999  0.0% 80.0% 80.0%  0.0% 0x60040100
>  500000    125   6    7    2   1   5  499999  0.0% 87.5% 87.5%  0.0% 0xc0040100
>  250000    250   6    7    2   1  10  249999  0.0% 87.5% 87.5%  0.0% 0xc0090100
>  125000    500   6    7    2   1  20  124999  0.0% 87.5% 87.5%  0.0% 0xc0130100
>  100000    625   6    7    2   1  25   99999  0.0% 87.5% 87.5%  0.0% 0xc0180100
>   50000   1250   6    7    2   1  50   49999  0.0% 87.5% 87.5%  0.0% 0xc0310100
>   20000   3125   6    7    2   1 125   19999  0.0% 87.5% 87.5%  0.0% 0xc07c0100
>   10000   6250   6    7    2   1 250    9999  0.0% 87.5% 87.5%  0.0% 0xc0f90100

But I've to port the algorithm from can-calc-bit-timing to the kernel.

Marc

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