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Message-ID: <8cb598c782fa376967f8e676b5ec9f195a3475fc.camel@mediatek.com>
Date: Sat, 2 Aug 2025 01:25:40 +0000
From: Yong Wu (吴勇) <Yong.Wu@...iatek.com>
To: "robh@...nel.org" <robh@...nel.org>, "matthias.bgg@...il.com"
	<matthias.bgg@...il.com>, "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
	"conor+dt@...nel.org" <conor+dt@...nel.org>, "krzk@...nel.org"
	<krzk@...nel.org>, Friday Yang (杨阳)
	<Friday.Yang@...iatek.com>, AngeloGioacchino Del Regno
	<angelogioacchino.delregno@...labora.com>
CC: "linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "linux-mediatek@...ts.infradead.org"
	<linux-mediatek@...ts.infradead.org>, "devicetree@...r.kernel.org"
	<devicetree@...r.kernel.org>, Project_Global_Chrome_Upstream_Group
	<Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: Re: [PATCH v8 2/2] memory: mtk-smi: mt8188: Add SMI reset and clamp
 for MT8188

On Wed, 2025-05-21 at 14:33 +0800, Friday Yang wrote:
> From: "Friday Yang" <friday.yang@...iatek.com>
> 
> To prevent handling glitch signals during MTCMOS on/off transitions,
> SMI requires clamp and reset operations. Parse the reset settings for
> SMI LARBs and the clamp settings for the SMI Sub-Common. Register
> genpd callback for the SMI LARBs located in image, camera and IPE
> subsystems, and apply reset and clamp operations within the callback.
> 
> Signed-off-by: Friday Yang <friday.yang@...iatek.com>
> Reviewed-by: AngeloGioacchino Del Regno <
> angelogioacchino.delregno@...labora.com>
> Acked-by: Rob Herring <robh@...nel.org>
> 
> ---
>  drivers/memory/mtk-smi.c | 133
> +++++++++++++++++++++++++++++++++++++++
>  1 file changed, 133 insertions(+)
> 
> diff --git a/drivers/memory/mtk-smi.c b/drivers/memory/mtk-smi.c
> index c086c22511f7..f3745f549629 100644
> --- a/drivers/memory/mtk-smi.c
> +++ b/drivers/memory/mtk-smi.c
> @@ -10,11 +10,15 @@
>  #include <linux/err.h>
>  #include <linux/io.h>
>  #include <linux/iopoll.h>
> +#include <linux/mfd/syscon.h>
>  #include <linux/module.h>
>  #include <linux/of.h>
>  #include <linux/of_platform.h>
>  #include <linux/platform_device.h>
> +#include <linux/pm_domain.h>
>  #include <linux/pm_runtime.h>
> +#include <linux/regmap.h>
> +#include <linux/reset.h>
>  #include <linux/soc/mediatek/mtk_sip_svc.h>
>  #include <soc/mediatek/smi.h>
>  #include <dt-bindings/memory/mt2701-larb-port.h>
> @@ -36,6 +40,12 @@
>  #define SMI_DCM				0x300
>  #define SMI_DUMMY			0x444
> 
> +#define SMI_COMMON_CLAMP_EN		0x3c0

Not used. remove this.

> +#define SMI_COMMON_CLAMP_EN_SET		0x3c4
> +#define SMI_COMMON_CLAMP_EN_CLR		0x3c8

Sort by the address. put above 0x444.

> +
> +#define SMI_SUB_COMM_INPORT_NR		(8)

Not used. remove this.

> +
>  /* SMI LARB */
>  #define SMI_LARB_SLP_CON                0xc
>  #define SLP_PROT_EN                     BIT(0)
> @@ -134,6 +144,7 @@ struct mtk_smi_larb_gen {
>  	unsigned int			larb_direct_to_common_mask;
>  	unsigned int			flags_general;
>  	const u8			(*ostd)[SMI_LARB_PORT_NR_MAX];
> +	const u8			*clamp_port;
>  };
> 
>  struct mtk_smi {
> @@ -150,6 +161,7 @@ struct mtk_smi {
>  };
> 
>  struct mtk_smi_larb { /* larb: local arbiter */
> +	struct device			*dev;
>  	struct mtk_smi			smi;
>  	void __iomem			*base;
>  	struct device			*smi_common_dev; /* common or
> sub-common dev */
> @@ -157,6 +169,10 @@ struct mtk_smi_larb { /* larb: local arbiter */
>  	int				larbid;
>  	u32				*mmu;
>  	unsigned char			*bank;
> +	struct regmap			*sub_comm_syscon;

This is also ok when the parent is smi-common, not just smi-sub-comm.
thus, personaly I'd like to rename to something like:

       struct regmap *smi_comm_syscon; /* smi-comm or sub_comm */

> +	u8				sub_comm_inport;
      
also rename to smi_comm_inport_id.

> +	struct notifier_block		nb;
> +	struct reset_control		*rst_con;
>  };
> 
>  static int
> @@ -446,6 +462,19 @@ static const u8
> mtk_smi_larb_mt8195_ostd[][SMI_LARB_PORT_NR_MAX] = {
>  	[28] = {0x1a, 0x0e, 0x0a, 0x0a, 0x0c, 0x0e, 0x10,},
>  };
> 
> +static const u8 mtk_smi_larb_clamp_port_mt8188[MTK_LARB_NR_MAX] = {
> +	[9]	= BIT(1), /* larb10 */
> +	[10]	= BIT(2), /* larb11a */
> +	[11]	= BIT(2), /* larb11b */
> +	[12]	= BIT(3), /* larb11c */
> +	[13]	= BIT(0), /* larb12 */
> +	[16]	= BIT(1), /* larb15 */
> +	[17]	= BIT(2), /* larb16a */
> +	[18]	= BIT(2), /* larb16b */
> +	[19]	= BIT(3), /* larb17a */
> +	[20]	= BIT(3), /* larb17b */
> +};
> +
>  static const struct mtk_smi_larb_gen mtk_smi_larb_mt2701 = {
>  	.port_in_larb = {
>  		LARB0_PORT_OFFSET, LARB1_PORT_OFFSET,
> @@ -498,6 +527,7 @@ static const struct mtk_smi_larb_gen
> mtk_smi_larb_mt8188 = {
>  	.flags_general	            = MTK_SMI_FLAG_THRT_UPDATE |
> MTK_SMI_FLAG_SW_FLAG |
>  				      MTK_SMI_FLAG_SLEEP_CTL |
> MTK_SMI_FLAG_CFG_PORT_SEC_CTL,
>  	.ostd		            = mtk_smi_larb_mt8188_ostd,
> +	.clamp_port                 = mtk_smi_larb_clamp_port_mt8188,
>  };
> 
>  static const struct mtk_smi_larb_gen mtk_smi_larb_mt8192 = {
> @@ -549,6 +579,46 @@ static void
> mtk_smi_larb_sleep_ctrl_disable(struct mtk_smi_larb *larb)
>  	writel_relaxed(0, larb->base + SMI_LARB_SLP_CON);
>  }
> 
> +static int mtk_smi_larb_clamp_protect_enable(struct device *dev,
> bool enable)
> +{
> +	struct mtk_smi_larb *larb = dev_get_drvdata(dev);
> +	u32 reg;
> +	int ret;
> +
> +	/* sub_comm_syscon could be NULL if larb directly linked to SMI
> common */
> +	if (!larb->sub_comm_syscon)
> +		return -EINVAL;
> +
> +	reg = enable ? SMI_COMMON_CLAMP_EN_SET :
> SMI_COMMON_CLAMP_EN_CLR;
> +
> +	ret = regmap_write(larb->sub_comm_syscon, reg,
> +			   larb->sub_comm_inport);

one line.

> +	if (ret)
> +		dev_err(dev, "Unable to %s clamp for input port %d:
> %d\n",
> +			enable ? "enable" : "disable",
> +			larb->sub_comm_inport, ret);
> +
> +	return ret;
> +}
> +
> +static int mtk_smi_genpd_callback(struct notifier_block *nb,
> +				  unsigned long flags, void *data)
> +{
> +	struct mtk_smi_larb *larb = container_of(nb, struct
> mtk_smi_larb, nb);
> +	struct device *dev = larb->dev;
> +
> +	if (flags == GENPD_NOTIFY_PRE_ON || flags ==
> GENPD_NOTIFY_PRE_OFF) {
> +		/* disable related SMI sub-common port */
> +		mtk_smi_larb_clamp_protect_enable(dev, true);
> +	} else if (flags == GENPD_NOTIFY_ON) {
> +		/* enable related SMI sub-common port */
> +		reset_control_reset(larb->rst_con);
> +		mtk_smi_larb_clamp_protect_enable(dev, false);
> +	}
> +
> +	return NOTIFY_OK;
> +}
> +
>  static int mtk_smi_device_link_common(struct device *dev, struct
> device **com_dev)
>  {
>  	struct platform_device *smi_com_pdev;
> @@ -605,6 +675,53 @@ static int mtk_smi_dts_clk_init(struct device
> *dev, struct mtk_smi *smi,
>  	return ret;
>  }
> 
> +static int mtk_smi_larb_parse_clamp_optional(struct mtk_smi_larb
> *larb)
> +{
> +	struct device *dev = larb->dev;
> +	const struct mtk_smi_larb_gen *larb_gen = larb->larb_gen;
> +	u32 larb_id;
> +	int ret;
> +
> +	/*
> +	 * Only SMI LARBs in camera, image and IPE subsys need to
> +	 * apply clamp and reset operations, others can be skipped.
> +	 */
> +	ret = of_property_read_u32(dev->of_node, "mediatek,larb-id",
> &larb_id);
> +	if (ret)
> +		return -EINVAL;
> +	if (!larb_gen->clamp_port || !larb_gen->clamp_port[larb_id])
> +		return 0;
> +
> +	larb->sub_comm_inport = larb_gen->clamp_port[larb_id];
> +	larb->sub_comm_syscon = syscon_regmap_lookup_by_phandle(dev-
> >of_node,
> +								"mediat
> ek,smi");
> +	if (IS_ERR(larb->sub_comm_syscon)) {
> +		larb->sub_comm_syscon = NULL;
> +		return dev_err_probe(dev, -EINVAL,
> +				     "Unknown clamp port for larb
> %d\n", larb_id);
> +	}
> +
> +	return 0;
> +}
> +
> +static int mtk_smi_larb_parse_reset_optional(struct mtk_smi_larb
> *larb)
> +{
> +	struct device *dev = larb->dev;
> +	int ret;
> +
> +	larb->rst_con = devm_reset_control_get_optional_exclusive(dev,
> "larb");
> +	if (!larb->rst_con)
> +		return 0;
> +
> +	larb->nb.notifier_call = mtk_smi_genpd_callback;
> +	ret = dev_pm_genpd_add_notifier(dev, &larb->nb);

Add dev_pm_genpd_remove_notifier in larb_remove.

Thanks.

> +	if (ret)
> +		return dev_err_probe(dev, -EINVAL,
> +				     "Failed to add genpd callback
> %d\n", ret);
> +
> +	return 0;
> +}
> +
>  static int mtk_smi_larb_probe(struct platform_device *pdev)
>  {
>  	struct mtk_smi_larb *larb;
> @@ -615,6 +732,7 @@ static int mtk_smi_larb_probe(struct
> platform_device *pdev)
>  	if (!larb)
>  		return -ENOMEM;
> 
> +	larb->dev = dev;
>  	larb->larb_gen = of_device_get_match_data(dev);
>  	larb->base = devm_platform_ioremap_resource(pdev, 0);
>  	if (IS_ERR(larb->base))
> @@ -631,6 +749,14 @@ static int mtk_smi_larb_probe(struct
> platform_device *pdev)
>  	if (ret < 0)
>  		return ret;
> 
> +	ret = mtk_smi_larb_parse_clamp_optional(larb);
> +	if (ret)
> +		goto err_link_remove;
> +
> +	ret = mtk_smi_larb_parse_reset_optional(larb);
> +	if (ret)
> +		goto err_link_remove;
> +
>  	pm_runtime_enable(dev);
>  	platform_set_drvdata(pdev, larb);
>  	ret = component_add(dev, &mtk_smi_larb_component_ops);
> @@ -640,6 +766,7 @@ static int mtk_smi_larb_probe(struct
> platform_device *pdev)
> 
>  err_pm_disable:
>  	pm_runtime_disable(dev);
> +err_link_remove:
>  	device_link_remove(dev, larb->smi_common_dev);
>  	return ret;
>  }
> @@ -770,6 +897,11 @@ static const struct mtk_smi_common_plat
> mtk_smi_common_mt8188_vpp = {
>  	.init     = mtk_smi_common_mt8195_init,
>  };
> 
> +static const struct mtk_smi_common_plat mtk_smi_sub_common_mt8188 =
> {
> +	.type     = MTK_SMI_GEN2_SUB_COMM,
> +	.has_gals = true,
> +};
> +
>  static const struct mtk_smi_common_plat mtk_smi_common_mt8192 = {
>  	.type     = MTK_SMI_GEN2,
>  	.has_gals = true,
> @@ -814,6 +946,7 @@ static const struct of_device_id
> mtk_smi_common_of_ids[] = {
>  	{.compatible = "mediatek,mt8186-smi-common", .data =
> &mtk_smi_common_mt8186},
>  	{.compatible = "mediatek,mt8188-smi-common-vdo", .data =
> &mtk_smi_common_mt8188_vdo},
>  	{.compatible = "mediatek,mt8188-smi-common-vpp", .data =
> &mtk_smi_common_mt8188_vpp},
> +	{.compatible = "mediatek,mt8188-smi-sub-common", .data =
> &mtk_smi_sub_common_mt8188},
>  	{.compatible = "mediatek,mt8192-smi-common", .data =
> &mtk_smi_common_mt8192},
>  	{.compatible = "mediatek,mt8195-smi-common-vdo", .data =
> &mtk_smi_common_mt8195_vdo},
>  	{.compatible = "mediatek,mt8195-smi-common-vpp", .data =
> &mtk_smi_common_mt8195_vpp},
> --
> 2.46.0
> 

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