[PATCH 1/4] ARM: i.MX6 Wandboard: dont do MMDC Write Leveling Calibration

[Sascha Hauer]

On Thu, Jun 08, 2017 at 08:41:34PM +0200, Alexander Kurz wrote:
> The hardware requirements to perform a write leveling calibration are
> not fulfilled by the Wandboard modules.
> IMX6DQRM §44.11.6 "Write leveling Calibration" Note2 states that the first
> bit of each data byte group (D0, D8, ..., D56) from memory must be connected
> to the same data bus bit on the controller, which is not given on the
> Wandboard modules, resulting in unpredictable calib results and breaking the
> WBQUAD 2GiB SDRAM setup. Similar restrictions exist for the i.MX6SD.
> 
> Remove this calibration and use the MPWLDECTRL defaults.
> 
> Signed-off-by: Alexander Kurz <akurz at blala.de>

Applied, thanks

Sascha

> ---
>  arch/arm/boards/technexion-wandboard/lowlevel.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/arch/arm/boards/technexion-wandboard/lowlevel.c b/arch/arm/boards/technexion-wandboard/lowlevel.c
> index d3eb9a0..ff5ae6d 100644
> --- a/arch/arm/boards/technexion-wandboard/lowlevel.c
> +++ b/arch/arm/boards/technexion-wandboard/lowlevel.c
> @@ -276,7 +276,6 @@ static unsigned long wandboard_dram_init(void)
>  
>  	__udelay(100);
>  
> -	mmdc_do_write_level_calibration();
>  	mmdc_do_dqs_calibration();
>  #ifdef DEBUG
>  	mmdc_print_calibration_results();
> -- 
> 2.1.4
> 
> 
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