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@mediatek.com>
---
drivers/memory/mtk-smi.c | 129 +++++++++++++++++++++++++++++++++++++++
1 file changed, 129 insertions(+)
diff --git a/drivers/memory/mtk-smi.c b/drivers/memory/mtk-smi.c
index 733e22f695ab..acc8904dd117 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>
@@ -34,6 +38,8 @@
#define SMI_FIFO_TH1 0x238
#define SMI_FIFO_TH2 0x23c
#define SMI_DCM 0x300
+#define SMI_COMMON_CLAMP_EN_SET 0x3c4
+#define SMI_COMMON_CLAMP_EN_CLR 0x3c8
#define SMI_DUMMY 0x444
/* SMI LARB */
@@ -134,6 +140,7 @@ 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 +157,7 @@ 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 +165,10 @@ struct mtk_smi_larb { /* larb: local arbiter */
int larbid;
u32 *mmu;
unsigned char *bank;
+ struct regmap *smi_comm_syscon; /* smi-comm or sub-comm */
+ u8 smi_comm_in_port_id; /* smi-comm or sub-comm */
+ struct notifier_block nb;
+ struct reset_control *rst_con;
};
static int
@@ -478,6 +490,19 @@ 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,
@@ -531,6 +556,7 @@ 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 = {
@@ -582,6 +608,45 @@ 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;
+
+ /* smi_comm_syscon may be NULL if the subsys doesn't have bus glitch issues */
+ if (!larb->smi_comm_syscon)
+ return -EINVAL;
+
+ reg = enable ? SMI_COMMON_CLAMP_EN_SET : SMI_COMMON_CLAMP_EN_CLR;
+
+ ret = regmap_write(larb->smi_comm_syscon, reg, larb->smi_comm_in_port_id);
+ if (ret)
+ dev_err(dev, "Unable to %s clamp for input port %d: %d\n",
+ enable ? "enable" : "disable",
+ larb->smi_comm_in_port_id, 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;
@@ -638,6 +703,51 @@ 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 || !larb_gen->clamp_port || !larb_gen->clamp_port[larb_id])
+ return 0;
+
+ larb->smi_comm_in_port_id = larb_gen->clamp_port[larb_id];
+ larb->smi_comm_syscon = syscon_regmap_lookup_by_phandle(dev->of_node,
+ "mediatek,smi");
+ if (IS_ERR(larb->smi_comm_syscon)) {
+ larb->smi_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);
+ 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;
@@ -648,6 +758,7 @@ 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))
@@ -664,6 +775,14 @@ 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);
@@ -673,6 +792,7 @@ 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;
}
@@ -681,6 +801,9 @@ static void mtk_smi_larb_remove(struct platform_device *pdev)
{
struct mtk_smi_larb *larb = platform_get_drvdata(pdev);
+ if (larb->nb.notifier_call)
+ dev_pm_genpd_remove_notifier(&pdev->dev);
+
device_link_remove(&pdev->dev, larb->smi_common_dev);
pm_runtime_disable(&pdev->dev);
component_del(&pdev->dev, &mtk_smi_larb_component_ops);
@@ -803,6 +926,11 @@ 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,
@@ -847,6 +975,7 @@ 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},
--
2.46.0On Mi, 2025-08-06 at 16:59 +0800, Friday Yang wrote:
> 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@mediatek.com>
> ---
> drivers/memory/mtk-smi.c | 129 +++++++++++++++++++++++++++++++++++++++
> 1 file changed, 129 insertions(+)
>
> diff --git a/drivers/memory/mtk-smi.c b/drivers/memory/mtk-smi.c
> index 733e22f695ab..acc8904dd117 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>
> @@ -34,6 +38,8 @@
> #define SMI_FIFO_TH1 0x238
> #define SMI_FIFO_TH2 0x23c
> #define SMI_DCM 0x300
> +#define SMI_COMMON_CLAMP_EN_SET 0x3c4
> +#define SMI_COMMON_CLAMP_EN_CLR 0x3c8
> #define SMI_DUMMY 0x444
>
> /* SMI LARB */
> @@ -134,6 +140,7 @@ 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 +157,7 @@ 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 +165,10 @@ struct mtk_smi_larb { /* larb: local arbiter */
> int larbid;
> u32 *mmu;
> unsigned char *bank;
> + struct regmap *smi_comm_syscon; /* smi-comm or sub-comm */
> + u8 smi_comm_in_port_id; /* smi-comm or sub-comm */
> + struct notifier_block nb;
> + struct reset_control *rst_con;
> };
>
> static int
> @@ -478,6 +490,19 @@ 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,
> @@ -531,6 +556,7 @@ 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 = {
> @@ -582,6 +608,45 @@ 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;
> +
> + /* smi_comm_syscon may be NULL if the subsys doesn't have bus glitch issues */
> + if (!larb->smi_comm_syscon)
> + return -EINVAL;
> +
> + reg = enable ? SMI_COMMON_CLAMP_EN_SET : SMI_COMMON_CLAMP_EN_CLR;
> +
> + ret = regmap_write(larb->smi_comm_syscon, reg, larb->smi_comm_in_port_id);
> + if (ret)
> + dev_err(dev, "Unable to %s clamp for input port %d: %d\n",
> + enable ? "enable" : "disable",
> + larb->smi_comm_in_port_id, 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;
> @@ -638,6 +703,51 @@ 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 || !larb_gen->clamp_port || !larb_gen->clamp_port[larb_id])
> + return 0;
> +
> + larb->smi_comm_in_port_id = larb_gen->clamp_port[larb_id];
> + larb->smi_comm_syscon = syscon_regmap_lookup_by_phandle(dev->of_node,
> + "mediatek,smi");
> + if (IS_ERR(larb->smi_comm_syscon)) {
> + larb->smi_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;
Please don't ignore errors.
regards
Philipp
On Tue, 2025-08-12 at 13:52 +0200, Philipp Zabel wrote:
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
>
>
> On Mi, 2025-08-06 at 16:59 +0800, Friday Yang wrote:
> > 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@mediatek.com>
> > ---
> > drivers/memory/mtk-smi.c | 129
> > +++++++++++++++++++++++++++++++++++++++
> > 1 file changed, 129 insertions(+)
> >
> > diff --git a/drivers/memory/mtk-smi.c b/drivers/memory/mtk-smi.c
> > index 733e22f695ab..acc8904dd117 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>
> > @@ -34,6 +38,8 @@
> > #define SMI_FIFO_TH1 0x238
> > #define SMI_FIFO_TH2 0x23c
> > #define SMI_DCM 0x300
> > +#define SMI_COMMON_CLAMP_EN_SET 0x3c4
> > +#define SMI_COMMON_CLAMP_EN_CLR 0x3c8
> > #define SMI_DUMMY 0x444
> >
> > /* SMI LARB */
> > @@ -134,6 +140,7 @@ 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 +157,7 @@ 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 +165,10 @@ struct mtk_smi_larb { /* larb: local arbiter
> > */
> > int larbid;
> > u32 *mmu;
> > unsigned char *bank;
> > + struct regmap *smi_comm_syscon; /* smi-comm
> > or sub-comm */
> > + u8 smi_comm_in_port_id; /* smi-
> > comm or sub-comm */
> > + struct notifier_block nb;
> > + struct reset_control *rst_con;
> > };
> >
> > static int
> > @@ -478,6 +490,19 @@ 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,
> > @@ -531,6 +556,7 @@ 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 = {
> > @@ -582,6 +608,45 @@ 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;
> > +
> > + /* smi_comm_syscon may be NULL if the subsys doesn't have bus
> > glitch issues */
> > + if (!larb->smi_comm_syscon)
> > + return -EINVAL;
> > +
> > + reg = enable ? SMI_COMMON_CLAMP_EN_SET :
> > SMI_COMMON_CLAMP_EN_CLR;
> > +
> > + ret = regmap_write(larb->smi_comm_syscon, reg, larb-
> > >smi_comm_in_port_id);
> > + if (ret)
> > + dev_err(dev, "Unable to %s clamp for input port %d:
> > %d\n",
> > + enable ? "enable" : "disable",
> > + larb->smi_comm_in_port_id, 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;
> > @@ -638,6 +703,51 @@ 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 || !larb_gen->clamp_port || !larb_gen-
> > >clamp_port[larb_id])
> > + return 0;
> > +
> > + larb->smi_comm_in_port_id = larb_gen->clamp_port[larb_id];
> > + larb->smi_comm_syscon = syscon_regmap_lookup_by_phandle(dev-
> > >of_node,
> > + "medi
> > atek,smi");
> > + if (IS_ERR(larb->smi_comm_syscon)) {
> > + larb->smi_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;
>
> Please don't ignore errors.
>
> regards
> Philipp
Thanks for comments.
As described before, we need to return the error in
'mtk_smi_larb_parse_reset' when it fails to get reset controller,
because it is not optional now. What's more,
'devm_reset_control_get_optional_exclusive' should be replaced with
'devm_reset_control_get_exclusive' in this case.
On Wed, 2025-08-06 at 16:59 +0800, Friday Yang wrote:
> 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@mediatek.com>
> ---
> drivers/memory/mtk-smi.c | 129
> +++++++++++++++++++++++++++++++++++++++
> 1 file changed, 129 insertions(+)
>
> diff --git a/drivers/memory/mtk-smi.c b/drivers/memory/mtk-smi.c
> index 733e22f695ab..acc8904dd117 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>
> @@ -34,6 +38,8 @@
> #define SMI_FIFO_TH1 0x238
> #define SMI_FIFO_TH2 0x23c
> #define SMI_DCM 0x300
> +#define SMI_COMMON_CLAMP_EN_SET 0x3c4
> +#define SMI_COMMON_CLAMP_EN_CLR 0x3c8
> #define SMI_DUMMY 0x444
>
> /* SMI LARB */
> @@ -134,6 +140,7 @@ 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 +157,7 @@ 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 +165,10 @@ struct mtk_smi_larb { /* larb: local arbiter */
> int larbid;
> u32 *mmu;
> unsigned char *bank;
> + struct regmap *smi_comm_syscon; /* smi-comm
> or sub-comm */
> + u8 smi_comm_in_port_id; /* smi-
> comm or sub-comm */
> + struct notifier_block nb;
> + struct reset_control *rst_con;
> };
>
> static int
> @@ -478,6 +490,19 @@ 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,
> @@ -531,6 +556,7 @@ 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 = {
> @@ -582,6 +608,45 @@ 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;
> +
> + /* smi_comm_syscon may be NULL if the subsys doesn't have bus
> glitch issues */
> + if (!larb->smi_comm_syscon)
> + return -EINVAL;
> +
> + reg = enable ? SMI_COMMON_CLAMP_EN_SET :
> SMI_COMMON_CLAMP_EN_CLR;
> +
> + ret = regmap_write(larb->smi_comm_syscon, reg, larb-
> >smi_comm_in_port_id);
> + if (ret)
> + dev_err(dev, "Unable to %s clamp for input port %d:
> %d\n",
> + enable ? "enable" : "disable",
> + larb->smi_comm_in_port_id, 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;
> @@ -638,6 +703,51 @@ 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 || !larb_gen->clamp_port || !larb_gen-
> >clamp_port[larb_id])
> + return 0;
> +
> + larb->smi_comm_in_port_id = larb_gen->clamp_port[larb_id];
> + larb->smi_comm_syscon = syscon_regmap_lookup_by_phandle(dev-
> >of_node,
> + "mediat
> ek,smi");
> + if (IS_ERR(larb->smi_comm_syscon)) {
> + larb->smi_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);
> + 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;
> @@ -648,6 +758,7 @@ 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))
> @@ -664,6 +775,14 @@ 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;
If we have "larb_gen->clamp_port[larb_id]", we must have the reset
function, is this right? if yes,
if (larb->smi_comm_syscon && larb_gen->clamp_port[larb_id]) {
ret = mtk_smi_larb_parse_reset(larb); // Not optional.
}
and then we could remove the checking of larb->smi_comm_syscon in
mtk_smi_larb_clamp_protect_enable, it will be simpler.
Thanks.
> +
> pm_runtime_enable(dev);
> platform_set_drvdata(pdev, larb);
> ret = component_add(dev, &mtk_smi_larb_component_ops);
> @@ -673,6 +792,7 @@ 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;
> }
> @@ -681,6 +801,9 @@ static void mtk_smi_larb_remove(struct
> platform_device *pdev)
> {
> struct mtk_smi_larb *larb = platform_get_drvdata(pdev);
>
> + if (larb->nb.notifier_call)
> + dev_pm_genpd_remove_notifier(&pdev->dev);
> +
> device_link_remove(&pdev->dev, larb->smi_common_dev);
> pm_runtime_disable(&pdev->dev);
> component_del(&pdev->dev, &mtk_smi_larb_component_ops);
> @@ -803,6 +926,11 @@ 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,
> @@ -847,6 +975,7 @@ 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},
On Tue, 2025-08-12 at 11:43 +0000, Yong Wu (吴勇) wrote:
> On Wed, 2025-08-06 at 16:59 +0800, Friday Yang wrote:
> > 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@mediatek.com>
> > ---
> > drivers/memory/mtk-smi.c | 129
> > +++++++++++++++++++++++++++++++++++++++
> > 1 file changed, 129 insertions(+)
> >
> > diff --git a/drivers/memory/mtk-smi.c b/drivers/memory/mtk-smi.c
> > index 733e22f695ab..acc8904dd117 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>
> > @@ -34,6 +38,8 @@
> > #define SMI_FIFO_TH1 0x238
> > #define SMI_FIFO_TH2 0x23c
> > #define SMI_DCM 0x300
> > +#define SMI_COMMON_CLAMP_EN_SET 0x3c4
> > +#define SMI_COMMON_CLAMP_EN_CLR 0x3c8
> > #define SMI_DUMMY 0x444
> >
> > /* SMI LARB */
> > @@ -134,6 +140,7 @@ 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 +157,7 @@ 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 +165,10 @@ struct mtk_smi_larb { /* larb: local arbiter
> > */
> > int larbid;
> > u32 *mmu;
> > unsigned char *bank;
> > + struct regmap *smi_comm_syscon; /* smi-
> > comm
> > or sub-comm */
> > + u8 smi_comm_in_port_id; /* smi-
> > comm or sub-comm */
> > + struct notifier_block nb;
> > + struct reset_control *rst_con;
> > };
> >
> > static int
> > @@ -478,6 +490,19 @@ 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,
> > @@ -531,6 +556,7 @@ 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 = {
> > @@ -582,6 +608,45 @@ 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;
> > +
> > + /* smi_comm_syscon may be NULL if the subsys doesn't have bus
> > glitch issues */
> > + if (!larb->smi_comm_syscon)
> > + return -EINVAL;
> > +
> > + reg = enable ? SMI_COMMON_CLAMP_EN_SET :
> > SMI_COMMON_CLAMP_EN_CLR;
> > +
> > + ret = regmap_write(larb->smi_comm_syscon, reg, larb-
> > > smi_comm_in_port_id);
> >
> > + if (ret)
> > + dev_err(dev, "Unable to %s clamp for input port %d:
> > %d\n",
> > + enable ? "enable" : "disable",
> > + larb->smi_comm_in_port_id, 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;
> > @@ -638,6 +703,51 @@ 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 || !larb_gen->clamp_port || !larb_gen-
> > > clamp_port[larb_id])
> >
> > + return 0;
> > +
> > + larb->smi_comm_in_port_id = larb_gen->clamp_port[larb_id];
> > + larb->smi_comm_syscon = syscon_regmap_lookup_by_phandle(dev-
> > > of_node,
> >
> > + "mediat
> > ek,smi");
> > + if (IS_ERR(larb->smi_comm_syscon)) {
> > + larb->smi_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);
> > + 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;
> > @@ -648,6 +758,7 @@ 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))
> > @@ -664,6 +775,14 @@ 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;
>
>
> If we have "larb_gen->clamp_port[larb_id]", we must have the reset
> function, is this right? if yes,
>
> if (larb->smi_comm_syscon && larb_gen->clamp_port[larb_id]) {
> ret = mtk_smi_larb_parse_reset(larb); // Not optional.
> }
>
> and then we could remove the checking of larb->smi_comm_syscon in
> mtk_smi_larb_clamp_protect_enable, it will be simpler.
>
> Thanks.
>
Thanks for comments.
You are right. We can fix it like this. Just determine whether
clamp and reset are required in 'mtk_smi_larb_probe'. If we
have "larb_gen->clamp_port[larb_id]", then clamp and reset operations
are required. And the '_optional' suffix should be removed from the
function name in this case.
in mtk_smi_larb_probe:
...
if (larb->larb_gen->clamp_port && larb->larb_gen->clamp_port[larb-
>larbid]) {
ret = mtk_smi_larb_parse_clamp(larb, larb->larbid);
if (ret)
goto err_link_remove;
ret = mtk_smi_larb_parse_reset(larb);
if (ret)
goto err_link_remove;
}
...
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