Re: [PATCH v3 10/15] memory: mtk-smi: Add bus_sel for mt8183

[Yong Wu]

On Sat, 2018-11-17 at 10:35 +0800, Yong Wu wrote:
> There are 2 mmu cells in a M4U HW. we could adjust some larbs entering
> mmu0 or mmu1 to balance the bandwidth via the smi-common register
> SMI_BUS_SEL(0x220)(Each larb occupy 2 bits).
> 
> In mt8183, For better performance, we switch larb1/2/3/7 to enter
> mmu1 while the others still keep enter mmu0.

The larb listed here don't match with the code below. I will fix it.

> 
> In mt8173 and mt2712, we don't get the performance issue,
> Keep its default value(0x0), that means all the larbs enter mmu0.
> 
> Signed-off-by: Yong Wu <yong.wu@xxxxxxxxxxxx>
> ---
>  drivers/memory/mtk-smi.c | 29 ++++++++++++++++++++++++++---
>  1 file changed, 26 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/memory/mtk-smi.c b/drivers/memory/mtk-smi.c
> index 3e6e0a8..e4daabb 100644
> --- a/drivers/memory/mtk-smi.c
> +++ b/drivers/memory/mtk-smi.c
> @@ -49,6 +49,12 @@
>  #define SMI_LARB_NONSEC_CON(id)	(0x380 + ((id) * 4))
>  #define F_MMU_EN		BIT(0)
>  
> +/* SMI COMMON */
> +#define SMI_BUS_SEL			0x220
> +#define SMI_BUS_LARB_SHIFT(larbid)	((larbid) << 1)
> +/* All are MMU0 defaultly. Only specialize mmu1 here. */
> +#define F_MMU1_LARB(larbid)		(0x1 << SMI_BUS_LARB_SHIFT(larbid))
> +
>  enum mtk_smi_gen {
>  	MTK_SMI_GEN1,
>  	MTK_SMI_GEN2
> @@ -56,6 +62,8 @@ enum mtk_smi_gen {
>  
>  struct mtk_smi_common_plat {
>  	enum mtk_smi_gen gen;
> +
> +	u32 bus_sel; /* Balance some larbs to enter mmu0 or mmu1 */
>  };
>  
>  struct mtk_smi_larb_gen {
> @@ -70,8 +78,8 @@ struct mtk_smi {
>  	struct clk			*clk_apb, *clk_smi;
>  	struct clk			*clk_gals0, *clk_gals1;
>  	struct clk			*clk_async; /*only needed by mt2701*/
> -	void __iomem			*smi_ao_base;
> -
> +	void __iomem			*smi_ao_base; /* only for gen1 */
> +	void __iomem			*base;	      /* only for gen2 */
>  	const struct mtk_smi_common_plat *plat;
>  };
>  
> @@ -401,6 +409,12 @@ static int __maybe_unused mtk_smi_larb_suspend(struct device *dev)
>  	.gen = MTK_SMI_GEN2,
>  };
>  
> +static const struct mtk_smi_common_plat mtk_smi_common_mt8183 = {
> +	.gen = MTK_SMI_GEN2,
> +	.bus_sel = F_MMU1_LARB(1) | F_MMU1_LARB(3) | F_MMU1_LARB(4) |
> +		   F_MMU1_LARB(7),
> +};
> +
>  static const struct of_device_id mtk_smi_common_of_ids[] = {
>  	{
>  		.compatible = "mediatek,mt8173-smi-common",
> @@ -416,7 +430,7 @@ static int __maybe_unused mtk_smi_larb_suspend(struct device *dev)
>  	},
>  	{
>  		.compatible = "mediatek,mt8183-smi-common",
> -		.data = &mtk_smi_common_gen2,
> +		.data = &mtk_smi_common_mt8183,
>  	},
>  	{}
>  };
> @@ -473,6 +487,11 @@ static int mtk_smi_common_probe(struct platform_device *pdev)
>  		ret = clk_prepare_enable(common->clk_async);
>  		if (ret)
>  			return ret;
> +	} else {
> +		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +		common->base = devm_ioremap_resource(dev, res);
> +		if (IS_ERR(common->base))
> +			return PTR_ERR(common->base);
>  	}
>  	pm_runtime_enable(dev);
>  	platform_set_drvdata(pdev, common);
> @@ -488,6 +507,7 @@ static int mtk_smi_common_remove(struct platform_device *pdev)
>  static int __maybe_unused mtk_smi_common_resume(struct device *dev)
>  {
>  	struct mtk_smi *common = dev_get_drvdata(dev);
> +	u32 bus_sel = common->plat->bus_sel;
>  	int ret;
>  
>  	ret = mtk_smi_clk_enable(common);
> @@ -495,6 +515,9 @@ static int __maybe_unused mtk_smi_common_resume(struct device *dev)
>  		dev_err(common->dev, "Failed to enable clock(%d).\n", ret);
>  		return ret;
>  	}
> +
> +	if (common->plat->gen == MTK_SMI_GEN2 && bus_sel)
> +		writel(bus_sel, common->base + SMI_BUS_SEL);
>  	return 0;
>  }
>