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From: Matthias Brugger <matthias.bgg@gmail.com>
To: Yong Wu <yong.wu@mediatek.com>
Cc: youlin.pei@mediatek.com, devicetree@vger.kernel.org,
	Nicolas Boichat <drinkcat@chromium.org>,
	srv_heupstream@mediatek.com, Joerg Roedel <joro@8bytes.org>,
	Will Deacon <will.deacon@arm.com>,
	linux-kernel@vger.kernel.org, Evan Green <evgreen@chromium.org>,
	Tomasz Figa <tfiga@google.com>,
	iommu@lists.linux-foundation.org,
	Rob Herring <robh+dt@kernel.org>,
	linux-mediatek@lists.infradead.org, yingjoe.chen@mediatek.com,
	anan.sun@mediatek.com, Robin Murphy <robin.murphy@arm.com>,
	Matthias Kaehlcke <mka@chromium.org>,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v7 16/21] memory: mtk-smi: Add bus_sel for mt8183
Date: Tue, 18 Jun 2019 23:07:30 +0200
Message-ID: <f3e200af-499e-a4af-9e2f-5e22ea5d8ee3@gmail.com> (raw)
In-Reply-To: <1560859855.8082.24.camel@mhfsdcap03>



On 18/06/2019 14:10, Yong Wu wrote:
> On Mon, 2019-06-17 at 18:23 +0200, Matthias Brugger wrote:
>>
>> 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@gmail.com>
>>> Signed-off-by: Yong Wu <yong.wu@mediatek.com>
>>> Reviewed-by: Evan Green <evgreen@chromium.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?
> 
> Yes. Thanks.
> 
> I will add it.
> 
>>
>>>  	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.
> 
> The smi-common node in the previous mt2712 and mt8173 also have the
> "reg" property even though they didn't use this base, Thus, It looks ok
> for all the cases.
> 

Correct, it is defined as a required property in the binding description so we
are good.
Sorry for the noise.

With the union added you can add:
Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>

>>
>> 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;
>>>  }
>>>  
>>>
> 
> 

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  reply index

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-10 12:17 [PATCH v7 00/21] MT8183 IOMMU SUPPORT Yong Wu
2019-06-10 12:17 ` [PATCH v7 01/21] dt-bindings: mediatek: Add binding for mt8183 IOMMU and SMI Yong Wu
2019-06-10 12:17 ` [PATCH v7 02/21] iommu/mediatek: Use a struct as the platform data Yong Wu
2019-06-10 12:17 ` [PATCH v7 03/21] memory: mtk-smi: Use a general config_port interface Yong Wu
2019-06-10 12:17 ` [PATCH v7 04/21] memory: mtk-smi: Use a struct for the platform data for smi-common Yong Wu
2019-06-10 12:17 ` [PATCH v7 05/21] iommu/io-pgtable-arm-v7s: Add paddr_to_iopte and iopte_to_paddr helpers Yong Wu
2019-06-10 12:17 ` [PATCH v7 06/21] iommu/io-pgtable-arm-v7s: Extend MediaTek 4GB Mode Yong Wu
2019-06-10 12:17 ` [PATCH v7 07/21] iommu/mediatek: Add bclk can be supported optionally Yong Wu
2019-06-15 19:18   ` Matthias Brugger
2019-06-10 12:17 ` [PATCH v7 08/21] iommu/mediatek: Add larb-id remapped support Yong Wu
2019-06-17  9:25   ` Matthias Brugger
2019-06-10 12:17 ` [PATCH v7 09/21] iommu/mediatek: Refine protect memory definition Yong Wu
2019-06-17  9:59   ` Matthias Brugger
2019-06-10 12:17 ` [PATCH v7 10/21] iommu/mediatek: Move reset_axi into plat_data Yong Wu
2019-06-17 10:19   ` Matthias Brugger
2019-06-10 12:17 ` [PATCH v7 11/21] iommu/mediatek: Move vld_pa_rng " Yong Wu
2019-06-17 10:27   ` Matthias Brugger
2019-06-10 12:17 ` [PATCH v7 12/21] memory: mtk-smi: Add gals support Yong Wu
2019-06-17 15:43   ` Matthias Brugger
2019-06-10 12:17 ` [PATCH v7 13/21] iommu/mediatek: Add mt8183 IOMMU support Yong Wu
2019-06-17 15:51   ` Matthias Brugger
2019-06-10 12:17 ` [PATCH v7 14/21] iommu/mediatek: Add mmu1 support Yong Wu
2019-06-17 15:58   ` Matthias Brugger
2019-06-18  6:19   ` Tomasz Figa
2019-06-18 12:09     ` Yong Wu
2019-06-18 14:05       ` Tomasz Figa
2019-06-10 12:17 ` [PATCH v7 15/21] memory: mtk-smi: Invoke pm runtime_callback to enable clocks Yong Wu
2019-06-17 16:13   ` Matthias Brugger
2019-06-10 12:17 ` [PATCH v7 16/21] memory: mtk-smi: Add bus_sel for mt8183 Yong Wu
2019-06-13  8:20   ` Pi-Hsun Shih
2019-06-17 16:28     ` Matthias Brugger
2019-06-17 16:23   ` Matthias Brugger
2019-06-18 12:10     ` Yong Wu
2019-06-18 21:07       ` Matthias Brugger [this message]
     [not found]   ` <CANdKZ0d873PJ2u=Hn_aUJBu3dDiNyueVwBv94-VXHGLJBvAbGg@mail.gmail.com>
2019-06-20  9:35     ` Matthias Brugger
2019-06-20 11:38       ` Matthias Brugger
2019-06-21  3:57         ` Pi-Hsun Shih
2019-06-10 12:17 ` [PATCH v7 17/21] memory: mtk-smi: Get rid of need_larbid Yong Wu
2019-06-18 13:45   ` Matthias Brugger
2019-06-20 13:59     ` Yong Wu
2019-06-10 12:17 ` [PATCH v7 18/21] iommu/mediatek: Fix VLD_PA_RNG register backup when suspend Yong Wu
2019-06-17 16:30   ` Matthias Brugger
2019-06-10 12:17 ` [PATCH v7 19/21] iommu/mediatek: Rename enable_4GB to dram_is_4gb Yong Wu
2019-06-18 16:06   ` Matthias Brugger
2019-06-20 13:59     ` Yong Wu
2019-06-21 10:10       ` Matthias Brugger
2019-06-22  2:42         ` Yong Wu
2019-06-10 12:17 ` [PATCH v7 20/21] iommu/mediatek: Fix iova_to_phys PA start for 4GB mode Yong Wu
2019-06-18 16:35   ` Matthias Brugger
2019-06-20 14:00     ` Yong Wu
2019-06-10 12:18 ` [PATCH v7 21/21] iommu/mediatek: Switch to SPDX license identifier Yong Wu
2019-06-17 16:33   ` Matthias Brugger

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