linux-kernel - Re: [PATCH v7 16/21] memory: mtk-smi: Add bus

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Date:   Mon, 17 Jun 2019 18:23:26 +0200
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Yong Wu <yong.wu@...iatek.com>, Joerg Roedel <joro@...tes.org>,
        Robin Murphy <robin.murphy@....com>,
        Rob Herring <robh+dt@...nel.org>
Cc:     Evan Green <evgreen@...omium.org>, Tomasz Figa <tfiga@...gle.com>,
        Will Deacon <will.deacon@....com>,
        linux-mediatek@...ts.infradead.org, srv_heupstream@...iatek.com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org, yingjoe.chen@...iatek.com,
        youlin.pei@...iatek.com, Nicolas Boichat <drinkcat@...omium.org>,
        anan.sun@...iatek.com, Matthias Kaehlcke <mka@...omium.org>
Subject: Re: [PATCH v7 16/21] memory: mtk-smi: Add bus_sel for mt8183



On 10/06/2019 14:17, 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 larb1/2/5/7 to enter
> mmu1 while the others still keep enter mmu0.
> 
> In mt8173 and mt2712, we don't get the performance issue,
> Keep its default value(0x0), that means all the larbs enter mmu0.
> 
> Note: smi gen1(mt2701/mt7623) don't have this bus_sel.
> 
> And, the base of smi-common is completely different with smi_ao_base
> of gen1, thus I add new variable for that.
> 
> CC: Matthias Brugger <matthias.bgg@...il.com>
> Signed-off-by: Yong Wu <yong.wu@...iatek.com>
> Reviewed-by: Evan Green <evgreen@...omium.org>
> ---
>  drivers/memory/mtk-smi.c | 22 ++++++++++++++++++++--
>  1 file changed, 20 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/memory/mtk-smi.c b/drivers/memory/mtk-smi.c
> index 9790801..08cf40d 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
> @@ -57,6 +63,7 @@ enum mtk_smi_gen {
>  struct mtk_smi_common_plat {
>  	enum mtk_smi_gen gen;
>  	bool             has_gals;
> +	u32              bus_sel; /* Balance some larbs to enter mmu0 or mmu1 */
>  };
>  
>  struct mtk_smi_larb_gen {
> @@ -72,8 +79,8 @@ 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 */

union {} maybe?

>  	const struct mtk_smi_common_plat *plat;
>  };
>  
> @@ -410,6 +417,8 @@ static int __maybe_unused mtk_smi_larb_suspend(struct device *dev)
>  static const struct mtk_smi_common_plat mtk_smi_common_mt8183 = {
>  	.gen      = MTK_SMI_GEN2,
>  	.has_gals = true,
> +	.bus_sel  = F_MMU1_LARB(1) | F_MMU1_LARB(2) | F_MMU1_LARB(5) |
> +		    F_MMU1_LARB(7),
>  };
>  
>  static const struct of_device_id mtk_smi_common_of_ids[] = {
> @@ -482,6 +491,11 @@ 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);

We must be backwards compatible with DT which does not have the base defined.

Regards,
Matthias

>  	}
>  	pm_runtime_enable(dev);
>  	platform_set_drvdata(pdev, common);
> @@ -497,6 +511,7 @@ 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);
> @@ -504,6 +519,9 @@ 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;
>  }
>  
>