[U-Boot] [PATCH v2 20/22] colibri_vf: adjust timing according to data sheet

Igor Opaniuk igor.opaniuk at toradex.com
Thu Mar 28 16:41:24 UTC 2019


Reviewed-by: Igor Opaniuk <igor.opaniuk at toradex.com>

On Mon, Mar 25, 2019 at 6:32 PM Marcel Ziswiler <marcel at ziswiler.com> wrote:
>
> From: Stefan Agner <stefan.agner at toradex.com>
>
> Using the DDR Validation tool in Processor Expert uncovered two
> timing inconsistencies. Since those timings are related to the
> suspend mode they do not affect or change regular memory behaviour.
>
> Signed-off-by: Stefan Agner <stefan.agner at toradex.com>
> Acked-by: Marcel Ziswiler <marcel.ziswiler at toradex.com>
>
> ---
>
> Changes in v2: None
>
>  board/toradex/colibri_vf/colibri_vf.c | 12 +++++++++---
>  1 file changed, 9 insertions(+), 3 deletions(-)
>
> diff --git a/board/toradex/colibri_vf/colibri_vf.c b/board/toradex/colibri_vf/colibri_vf.c
> index 9c5bf4951b..3e39912f91 100644
> --- a/board/toradex/colibri_vf/colibri_vf.c
> +++ b/board/toradex/colibri_vf/colibri_vf.c
> @@ -101,15 +101,21 @@ int dram_init(void)
>                 .tras_lockout      = 0,
>                 .tdal              = 12,
>                 .bstlen            = 3,
> -               .tdll              = 512,
> +               .tdll              = 512, /* not applicable since freq. scaling
> +                                          * is not used
> +                                          */
>                 .trp_ab            = 6,
>                 .tref              = 3120,
>                 .trfc              = 64,
>                 .tref_int          = 0,
>                 .tpdex             = 3,
>                 .txpdll            = 10,
> -               .txsnr             = 48,
> -               .txsr              = 468,
> +               .txsnr             = 68,  /* changed to conform to JEDEC
> +                                          * specifications
> +                                          */
> +               .txsr              = 506, /* changed to conform to JEDEC
> +                                          * specifications
> +                                          */
>                 .cksrx             = 5,
>                 .cksre             = 5,
>                 .freq_chg_en       = 0,
> --
> 2.20.1
>
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