Re: [PATCH v3 28/57] ram: rk3399: Configure SLEWP_EN, SLEWN_EN for lpddr4

[Kever Yang <kever.yang@xxxxxxxxxxxxxx>]

On 2019/7/16 下午7:57, Jagan Teki wrote:
> Configure SLEWP_EN, SLEWN_EN for lpddr4 during phy IO config.
>
> 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_rk3399.c | 21 +++++++++++++++++++++
>   1 file changed, 21 insertions(+)
>
> diff --git a/drivers/ram/rockchip/sdram_rk3399.c b/drivers/ram/rockchip/sdram_rk3399.c
> index a9e092c39f..c02f936f2a 100644
> --- a/drivers/ram/rockchip/sdram_rk3399.c
> +++ b/drivers/ram/rockchip/sdram_rk3399.c
> @@ -37,6 +37,8 @@
>   
>   #define PHY_BOOSTP_EN		0x1
>   #define PHY_BOOSTN_EN		0x1
> +#define PHY_SLEWP_EN		0x1
> +#define PHY_SLEWN_EN		0x1
>   
>   #define CRU_SFTRST_DDR_CTRL(ch, n)	((0x1 << (8 + 16 + (ch) * 4)) | \
>   					((n) << (8 + (ch) * 4)))
> @@ -334,6 +336,25 @@ static int phy_io_config(const struct chan_info *chan,
>   		clrsetbits_le32(&denali_phy[937], 0xff << 20, reg_value << 20);
>   		/* PHY_939 PHY_PAD_CS_DRIVE */
>   		clrsetbits_le32(&denali_phy[939], 0xff << 20, reg_value << 20);
> +
> +		/* SLEWP_EN & SLEWN_EN */
> +		reg_value = ((PHY_SLEWP_EN << 3) | PHY_SLEWN_EN);
> +		/* PHY_924 PHY_PAD_FDBK_DRIVE */
> +		clrsetbits_le32(&denali_phy[924], 0x3f << 8, reg_value << 8);
> +		/* PHY_926 PHY_PAD_DATA_DRIVE */
> +		clrsetbits_le32(&denali_phy[926], 0x3f, reg_value);
> +		/* PHY_927 PHY_PAD_DQS_DRIVE */
> +		clrsetbits_le32(&denali_phy[927], 0x3f, reg_value);
> +		/* PHY_928 PHY_PAD_ADDR_DRIVE */
> +		clrsetbits_le32(&denali_phy[928], 0x3f << 8, reg_value << 8);
> +		/* PHY_929 PHY_PAD_CLK_DRIVE */
> +		clrsetbits_le32(&denali_phy[929], 0x3f << 8, reg_value << 8);
> +		/* PHY_935 PHY_PAD_CKE_DRIVE */
> +		clrsetbits_le32(&denali_phy[935], 0x3f << 8, reg_value << 8);
> +		/* PHY_937 PHY_PAD_RST_DRIVE */
> +		clrsetbits_le32(&denali_phy[937], 0x3f << 8, reg_value << 8);
> +		/* PHY_939 PHY_PAD_CS_DRIVE */
> +		clrsetbits_le32(&denali_phy[939], 0x3f << 8, reg_value << 8);
>   	}
>   
>   	/* speed setting */



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