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Subject: Re: [PATCH v3 3/3] memory: mtk-smi: Add bandwidth initial golden
 setting
To:     Ming-Fan Chen <ming-fan.chen@mediatek.com>,
        Rob Herring <robh+dt@kernel.org>
Cc:     Yong Wu <yong.wu@mediatek.com>, Evan Green <evgreen@chromium.org>,
        Joerg Roedel <jroedel@suse.de>, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-mediatek@lists.infradead.org, wsd_upstream@mediatek.com
References: <1578465691-30692-1-git-send-email-ming-fan.chen@mediatek.com>
 <1578465691-30692-5-git-send-email-ming-fan.chen@mediatek.com>
From:   Matthias Brugger <matthias.bgg@gmail.com>
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Message-ID: <8d168fcc-3b85-a893-316b-8d7b4d29dea4@gmail.com>
Date:   Wed, 12 Feb 2020 13:17:56 +0100
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On 08/01/2020 07:41, Ming-Fan Chen wrote:
> SMI bandwidth initial golden setting for MT6779 make sure
> better performance of memory control for multimedia modules.
> 
> changelog since v2:
> Define local variable from long to short
> Merge writel_relaxed into one line
> Remove SMI_LARB_SW_FLAG in smi-larb
> 
> Signed-off-by: Ming-Fan Chen <ming-fan.chen@mediatek.com>
> ---
>  drivers/memory/mtk-smi.c |  118 +++++++++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 117 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/memory/mtk-smi.c b/drivers/memory/mtk-smi.c
> index d0b747a..222ac7e 100644
> --- a/drivers/memory/mtk-smi.c
> +++ b/drivers/memory/mtk-smi.c
> @@ -41,21 +41,47 @@
>  #define SMI_LARB_NONSEC_CON(id)	(0x380 + ((id) * 4))
>  #define F_MMU_EN		BIT(0)
>  
> +#define SMI_LARB_CMD_THRT_CON	 0x24
> +#define SMI_LARB_OSTDL_PORT	 0x200
> +#define SMI_LARB_OSTDL_PORTx(id) (SMI_LARB_OSTDL_PORT + (((id) & 0x1f) << 2))
> +
>  /* SMI COMMON */
> +#define SMI_L1LEN			0x100
> +#define SMI_L1ARB0			0x104
> +#define SMI_L1ARB(id)			(SMI_L1ARB0 + (((id) & 0x7) << 2))
> +
>  #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))
>  
> +#define SMI_M4U_TH			0x234
> +#define SMI_FIFO_TH1			0x238
> +#define SMI_FIFO_TH2			0x23c
> +#define SMI_DCM				0x300
> +#define SMI_DUMMY			0x444
> +
> +#define SMI_LARB_PORT_NR_MAX		32
> +#define SMI_LARB_MISC_NR		1
> +
>  enum mtk_smi_gen {
>  	MTK_SMI_GEN1,
>  	MTK_SMI_GEN2
>  };
>  
> +struct mtk_smi_reg_pair {
> +	u16	offset;
> +	u32	value;
> +};
> +
>  struct mtk_smi_common_plat {
>  	enum mtk_smi_gen gen;
>  	bool             has_gals;
>  	u32              bus_sel; /* Balance some larbs to enter mmu0 or mmu1 */
> +	bool                          has_bwc;

bwc = bandwith configuration ?

> +	u8                            larb_nr;
> +	const u16                     *l1arb;
> +	const struct mtk_smi_reg_pair *misc;

maybe encapsulate this in a new struct mtk_smi_common_bwidth_config or something
like this?

>  };
>  
>  struct mtk_smi_larb_gen {
> @@ -63,6 +89,9 @@ struct mtk_smi_larb_gen {
>  	void (*config_port)(struct device *);
>  	unsigned int			larb_direct_to_common_mask;
>  	bool				has_gals;
> +	bool				has_bwc;
> +	const u8			(*ostdl)[SMI_LARB_PORT_NR_MAX];

array of pointers? maybe:
const u8		*ostdl[SMI_LARB_PORT_NR_MAX];

or even better
const u8		**ostdl;


> +	const struct mtk_smi_reg_pair	(*misc)[SMI_LARB_MISC_NR];

Same here.

>  };
>  
>  struct mtk_smi {
> @@ -159,6 +188,8 @@ void mtk_smi_larb_put(struct device *larbdev)
>  static void mtk_smi_larb_config_port_gen2_general(struct device *dev)
>  {
>  	struct mtk_smi_larb *larb = dev_get_drvdata(dev);
> +	const struct mtk_smi_reg_pair *misc;
> +	const u8 *ostdl;
>  	u32 reg;
>  	int i;
>  
> @@ -170,6 +201,18 @@ static void mtk_smi_larb_config_port_gen2_general(struct device *dev)
>  		reg |= F_MMU_EN;
>  		writel(reg, larb->base + SMI_LARB_NONSEC_CON(i));
>  	}
> +
> +	if (!larb->larb_gen->has_bwc)

I'd prefer
if (larb->larb_gen->has_bwc) {
...
}

> +		return;
> +
> +	for (i = 0, ostdl = larb->larb_gen->ostdl[larb->larbid];
> +		i < SMI_LARB_PORT_NR_MAX; i++)

ostdl = larb->larb_gen->ostdl[larb->larbid];

for (i = 0, ; i < SMI_LARB_PORT_NR_MAX; i++)


> +		writel_relaxed(ostdl[i], larb->base + SMI_LARB_OSTDL_PORTx(i));
> +
> +	for (i = 0, misc = larb->larb_gen->misc[larb->larbid];
> +		i < SMI_LARB_MISC_NR; i++)

same here.

> +		writel_relaxed(misc[i].value, larb->base + misc[i].offset);

new line here.

> +	wmb(); /* make sure settings are written */
>  }
>  
>  static void mtk_smi_larb_config_port_mt8173(struct device *dev)
> @@ -239,11 +282,53 @@ static void mtk_smi_larb_config_port_gen1(struct device *dev)
>  	.larb_direct_to_common_mask = BIT(8) | BIT(9),      /* bdpsys */
>  };
>  
> +static const u8 mtk_smi_larb_mt6779_ostdl[][SMI_LARB_PORT_NR_MAX] = {

static const u8 mtk_smi_larb_mt6779_ostdl[MTK_LARB_NR_MAX][SMI_LARB_PORT_NR_MAX]

otherwise if we forget a line, the driver could access random memory.


> +	{0x28, 0x28, 0x01, 0x28, 0x01, 0x01, 0x0a, 0x0a, 0x28,},
> +	{0x28, 0x01, 0x28, 0x28, 0x0a, 0x01, 0x01, 0x0d, 0x0d, 0x07,
> +	 0x01, 0x07, 0x01, 0x28,},
> +	{0x18, 0x01, 0x08, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x02,
> +	 0x01, 0x01},
> +	{0x01, 0x03, 0x02, 0x01, 0x01, 0x01, 0x01, 0x04, 0x02, 0x01,
> +	 0x04, 0x01, 0x01, 0x01, 0x01, 0x04, 0x0b, 0x13, 0x14,},
> +	{},
> +	{0x13, 0x0f, 0x0d, 0x07, 0x07, 0x04, 0x03, 0x01, 0x03, 0x01,
> +	 0x05, 0x0c, 0x01, 0x01, 0x08, 0x06, 0x02, 0x01, 0x08, 0x08,
> +	 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,},
> +	{0x01, 0x01, 0x01,},
> +	{0x01, 0x01, 0x01, 0x01,},
> +	{0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,},
> +	{0x1f, 0x1a, 0x02, 0x04, 0x1f, 0x02, 0x14, 0x01, 0x1f, 0x04,
> +	 0x04, 0x01, 0x01, 0x01, 0x02, 0x02, 0x04, 0x02, 0x01, 0x02,
> +	 0x04, 0x02, 0x02, 0x01,},
> +	{0x1f, 0x1a, 0x02, 0x04, 0x1f, 0x02, 0x14, 0x01, 0x1f, 0x1a,
> +	 0x02, 0x04, 0x1f, 0x02, 0x14, 0x01, 0x01, 0x02, 0x02, 0x04,
> +	 0x02, 0x0a, 0x02, 0x02, 0x04, 0x02, 0x0a, 0x02, 0x04, 0x02, 0x04,},
> +	{0x01, 0x01, 0x01, 0x01, 0x01,},
> +};
> +
> +static const struct mtk_smi_reg_pair
> +mtk_smi_larb_mt6779_misc[][SMI_LARB_MISC_NR] = {

same here.

> +	{{SMI_LARB_CMD_THRT_CON, 0x370256},},
> +	{{SMI_LARB_CMD_THRT_CON, 0x300256},},
> +	{{SMI_LARB_CMD_THRT_CON, 0x370256},},
> +	{},
> +	{{SMI_LARB_CMD_THRT_CON, 0x300256},},
> +	{{SMI_LARB_CMD_THRT_CON, 0x300256},},
> +	{{SMI_LARB_CMD_THRT_CON, 0x300256},},
> +	{{SMI_LARB_CMD_THRT_CON, 0x300256},},
> +	{{SMI_LARB_CMD_THRT_CON, 0x370256},},
> +	{{SMI_LARB_CMD_THRT_CON, 0x370256},},
> +	{{SMI_LARB_CMD_THRT_CON, 0x370256},},
> +};
> +
>  static const struct mtk_smi_larb_gen mtk_smi_larb_mt6779 = {
>  	.config_port  = mtk_smi_larb_config_port_gen2_general,
>  	.larb_direct_to_common_mask =
>  		BIT(4) | BIT(6) | BIT(11) | BIT(12) | BIT(13),
>  		/* DUMMY | IPU0 | IPU1 | CCU | MDLA */
> +	.has_bwc = true,
> +	.ostdl   = mtk_smi_larb_mt6779_ostdl,
> +	.misc    = mtk_smi_larb_mt6779_misc,
>  };
>  
>  static const struct mtk_smi_larb_gen mtk_smi_larb_mt8183 = {
> @@ -397,11 +482,30 @@ static int __maybe_unused mtk_smi_larb_suspend(struct device *dev)
>  	.gen = MTK_SMI_GEN2,
>  };
>  
> +static const u16 mtk_smi_common_mt6779_l1arb[] = {
> +	0x1000, 0x1000, 0x1000, 0x1000, 0x1000, 0x1000, 0x1000, 0x1000,
> +};
> +
> +static const struct
> +mtk_smi_reg_pair mtk_smi_common_mt6779_misc[SMI_COMMON_MISC_NR] = {
> +	{SMI_L1LEN, 0xb},
> +	{SMI_M4U_TH, 0xe100e10},
> +	{SMI_FIFO_TH1, 0x506090a},
> +	{SMI_FIFO_TH2, 0x506090a},
> +	{SMI_DCM, 0x4f1},
> +	{SMI_DUMMY, 0x1},
> +};
> +
>  static const struct mtk_smi_common_plat mtk_smi_common_mt6779 = {
>  	.gen		= MTK_SMI_GEN2,
>  	.has_gals	= true,
>  	.bus_sel	= F_MMU1_LARB(1) | F_MMU1_LARB(2) | F_MMU1_LARB(4) |
>  			  F_MMU1_LARB(5) | F_MMU1_LARB(6) | F_MMU1_LARB(7),
> +	.has_bwc	= true,
> +	.larb_nr	= ARRAY_SIZE(mtk_smi_common_mt6779_l1arb),
> +	.l1arb		= mtk_smi_common_mt6779_l1arb,
> +	.misc_nr	= ARRAY_SIZE(mtk_smi_common_mt6779_misc),
> +	.misc		= mtk_smi_common_mt6779_misc,
>  };
>  
>  static const struct mtk_smi_common_plat mtk_smi_common_mt8183 = {
> @@ -506,7 +610,7 @@ 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;
> +	int i, ret;
>  
>  	ret = mtk_smi_clk_enable(common);
>  	if (ret) {
> @@ -516,6 +620,18 @@ static int __maybe_unused mtk_smi_common_resume(struct device *dev)
>  
>  	if (common->plat->gen == MTK_SMI_GEN2 && bus_sel)
>  		writel(bus_sel, common->base + SMI_BUS_SEL);
> +
> +	if (!common->plat->has_bwc)
> +		return 0;
> +

if (common->plat->has_bwc) {
...
}
return 0;

> +	for (i = 0; i < common->plat->larb_nr; i++)
> +		writel_relaxed(common->plat->l1arb[i],
> +			       common->base + SMI_L1ARB(i));
> +
> +	for (i = 0; i < common->plat->misc_nr; i++)
> +		writel_relaxed(common->plat->misc[i].value,
> +			       common->base + common->plat->misc[i].value);
> +	wmb(); /* make sure settings are written */
>  	return 0;
>  }
>  
>