[PATCH v1 1/1] sunxi: extend R528/T113-s3/D1(s) DRAM initialisation

[Andre Przywara]

On Sun, 14 Sep 2025 16:44:11 +0200
Lukas Schmid <lukas.schmid at netcube.li> wrote:

Hi Lukas,

thanks for the patch!

CC:ing the sunxi list and András, who I think has some T113-s4 device as
well.

It would be good to see some Tested-by: tags, but otherwise the patch
looks good, I'd say.

Also I hear that awboot uses 0x6800 as the chip ID for the -s4, can
someone shed some light on this?

Cheers,
Andre

> Extend the DRAM initialisation code to add support for the T113-S4 aka
> T113M4020DC0 by checking the SoC's CHIPID.
> 
> Signed-off-by: Lukas Schmid <lukas.schmid at netcube.li>
> ---
>  drivers/ram/sunxi/dram_sun20i_d1.c | 13 ++++++++++++-
>  drivers/ram/sunxi/dram_sun20i_d1.h |  7 +++++++
>  2 files changed, 19 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/ram/sunxi/dram_sun20i_d1.c b/drivers/ram/sunxi/dram_sun20i_d1.c
> index a1794032f3b..01d19d5feaa 100644
> --- a/drivers/ram/sunxi/dram_sun20i_d1.c
> +++ b/drivers/ram/sunxi/dram_sun20i_d1.c
> @@ -54,6 +54,11 @@ static void sid_read_ldoB_cal(const dram_para_t *para)
>  	clrsetbits_le32(0x3000150, 0xff00, reg << 8);
>  }
>  
> +static u32 sid_read_soc_chipid(void)
> +{
> +	return readl(SUNXI_SID_BASE + 0x00) & 0xffff;
> +}
> +
>  static void dram_voltage_set(const dram_para_t *para)
>  {
>  	int vol;
> @@ -663,6 +668,7 @@ static void mctl_phy_ac_remapping(const dram_para_t *para,
>  
>  	fuse = (readl(SUNXI_SID_BASE + 0x28) & 0xf00) >> 8;
>  	debug("DDR efuse: 0x%x\n", fuse);
> +	debug("SoC Chip ID: 0x%08x\n", sid_read_soc_chipid());
>  
>  	if (para->dram_type == SUNXI_DRAM_TYPE_DDR2) {
>  		if (fuse == 15)
> @@ -675,7 +681,12 @@ static void mctl_phy_ac_remapping(const dram_para_t *para,
>  			switch (fuse) {
>  			case 8: cfg = ac_remapping_tables[2]; break;
>  			case 9: cfg = ac_remapping_tables[3]; break;
> -			case 10: cfg = ac_remapping_tables[5]; break;
> +			case 10:
> +				if (sid_read_soc_chipid() == SUNXI_CHIPID_T113M4020DC0)
> +					cfg = ac_remapping_tables[0];
> +				else
> +					cfg = ac_remapping_tables[5];
> +				break;
>  			case 11: cfg = ac_remapping_tables[4]; break;
>  			default:
>  			case 12: cfg = ac_remapping_tables[1]; break;
> diff --git a/drivers/ram/sunxi/dram_sun20i_d1.h b/drivers/ram/sunxi/dram_sun20i_d1.h
> index 91383f6cf10..7bd8f67a77a 100644
> --- a/drivers/ram/sunxi/dram_sun20i_d1.h
> +++ b/drivers/ram/sunxi/dram_sun20i_d1.h
> @@ -19,6 +19,13 @@ enum sunxi_dram_type {
>  	SUNXI_DRAM_TYPE_LPDDR3 = 7,
>  };
>  
> +enum sunxi_soc_chipid {
> +	SUNXI_CHIPID_F133A = 0x5C00,
> +	SUNXI_CHIPID_D1S = 0x5E00,
> +	SUNXI_CHIPID_T113S3 = 0x6000,
> +	SUNXI_CHIPID_T113M4020DC0 = 0x7200,
> +};
> +
>  /*
>   * This structure contains a mixture of fixed configuration settings,
>   * variables that are used at runtime to communicate settings between