Re: [PATCH v3 02/57] ram: rk3399: Add channel number encoder macro

[Kever Yang <kever.yang@xxxxxxxxxxxxxx>]

On 2019/7/16 下午7:56, Jagan Teki wrote:
> Add simplified and meaningful macro for channel number.
>
> Signed-off-by: Jagan Teki <jagan@xxxxxxxxxxxxxxxxxxxx>
> Signed-off-by: YouMin Chen <cym@xxxxxxxxxxxxxx>

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

Thanks,
 - Kever
> ---
>   arch/arm/include/asm/arch-rockchip/sdram_common.h | 2 ++
>   drivers/ram/rockchip/sdram_rk3399.c               | 2 +-
>   2 files changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm/include/asm/arch-rockchip/sdram_common.h b/arch/arm/include/asm/arch-rockchip/sdram_common.h
> index 92a4c485c2..076afe2ae3 100644
> --- a/arch/arm/include/asm/arch-rockchip/sdram_common.h
> +++ b/arch/arm/include/asm/arch-rockchip/sdram_common.h
> @@ -73,6 +73,8 @@ struct sdram_base_params {
>   #define SYS_REG_ROW_3_4_MASK		1
>   #define SYS_REG_CHINFO_SHIFT(ch)	(28 + (ch))
>   #define SYS_REG_ENC_DDRTYPE(n)		((n) << SYS_REG_DDRTYPE_SHIFT)
> +#define SYS_REG_ENC_NUM_CH(n)		(((n) - SYS_REG_NUM_CH_MASK) << \
> +					SYS_REG_NUM_CH_SHIFT)
>   #define SYS_REG_RANK_SHIFT(ch)		(11 + (ch) * 16)
>   #define SYS_REG_RANK_MASK		1
>   #define SYS_REG_COL_SHIFT(ch)		(9 + (ch) * 16)
> diff --git a/drivers/ram/rockchip/sdram_rk3399.c b/drivers/ram/rockchip/sdram_rk3399.c
> index f58836c037..830311ffa9 100644
> --- a/drivers/ram/rockchip/sdram_rk3399.c
> +++ b/drivers/ram/rockchip/sdram_rk3399.c
> @@ -1077,7 +1077,7 @@ static void dram_all_config(struct dram_info *dram,
>   	unsigned int channel, idx;
>   
>   	sys_reg |= SYS_REG_ENC_DDRTYPE(params->base.dramtype);
> -	sys_reg |= (params->base.num_channels - 1) << SYS_REG_NUM_CH_SHIFT;
> +	sys_reg |= SYS_REG_ENC_NUM_CH(params->base.num_channels);
>   
>   	for (channel = 0, idx = 0;
>   	     (idx < params->base.num_channels) && (channel < 2);



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