Re: [PATCH v3 12/18] ram: rockchip: debug: Get the cs capacity

[Kever Yang <kever.yang@xxxxxxxxxxxxxx>]

On 2019/7/16 上午2:28, Jagan Teki wrote:
> Add code to get the channel capacity, this would help to
> print the capacity of specific channel.
>
> Here is sample print on LPDDR4, 50MHz channel 0
> BW=32 Col=10 Bk=8 CS0 Row=15 CS1 Row=15 CS=2 Die BW=16 Size=2048MB
>
> Signed-off-by: Jagan Teki <jagan@xxxxxxxxxxxxxxxxxxxx>
> Signed-off-by: YouMin Chen <cym@xxxxxxxxxxxxxx>

Reviewed-by: Kever Yang <Kever.yang@xxxxxxxxxxxxxx>

Thanks,
 - Kever
> ---
>   drivers/ram/rockchip/sdram_debug.c | 46 +++++++++++++++++++++++++++++-
>   1 file changed, 45 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/ram/rockchip/sdram_debug.c b/drivers/ram/rockchip/sdram_debug.c
> index 69a6f94a73..19e9225c12 100644
> --- a/drivers/ram/rockchip/sdram_debug.c
> +++ b/drivers/ram/rockchip/sdram_debug.c
> @@ -33,10 +33,46 @@ void sdram_print_dram_type(unsigned char dramtype)
>   	}
>   }
>   
> +/**
> + * cs  = 0, cs0
> + * cs  = 1, cs1
> + * cs => 2, cs0+cs1
> + * note: it didn't consider about row_3_4
> + */
> +u64 sdram_get_cs_cap(struct sdram_cap_info *cap_info, u32 cs, u32 dram_type)
> +{
> +	u32 bg;
> +	u64 cap[2];
> +
> +	if (dram_type == DDR4)
> +		/* DDR4 8bit dram BG = 2(4bank groups),
> +		 * 16bit dram BG = 1 (2 bank groups)
> +		 */
> +		bg = (cap_info->dbw == 0) ? 2 : 1;
> +	else
> +		bg = 0;
> +
> +	cap[0] = 1llu << (cap_info->bw + cap_info->col +
> +		 bg + cap_info->bk + cap_info->cs0_row);
> +
> +	if (cap_info->rank == 2)
> +		cap[1] = 1llu << (cap_info->bw + cap_info->col +
> +			 bg + cap_info->bk + cap_info->cs1_row);
> +	else
> +		cap[1] = 0;
> +
> +	if (cs == 0)
> +		return cap[0];
> +	else if (cs == 1)
> +		return cap[1];
> +	else
> +		return (cap[0] + cap[1]);
> +}
> +
>   void sdram_print_ddr_info(struct sdram_cap_info *cap_info,
>   			  struct sdram_base_params *base)
>   {
> -	u32 bg;
> +	u32 bg, cap;
>   
>   	bg = (cap_info->dbw == 0) ? 2 : 1;
>   
> @@ -71,4 +107,12 @@ void sdram_print_ddr_info(struct sdram_cap_info *cap_info,
>   
>   	printascii(" Die BW=");
>   	printdec(8 << cap_info->dbw);
> +
> +	cap = sdram_get_cs_cap(cap_info, 3, base->dramtype);
> +	if (cap_info->row_3_4)
> +		cap = cap * 3 / 4;
> +
> +	printascii(" Size=");
> +	printdec(cap >> 20);
> +	printascii("MB\n");
>   }



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