On Tue, 2025-01-21 at 09:53 +0100, Philipp Zabel wrote:
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>
>
> On Di, 2025-01-21 at 14:49 +0800, Friday Yang wrote:
> > From: "friday.yang" <friday.yang@xxxxxxxxxxxx>
> >
> > 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@xxxxxxxxxxxx>
> > ---
> > drivers/memory/mtk-smi.c | 141
> > +++++++++++++++++++++++++++++++++++++--
> > 1 file changed, 137 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/memory/mtk-smi.c b/drivers/memory/mtk-smi.c
> > index 5710348f72f6..aaeb80379ec1 100644
> > --- a/drivers/memory/mtk-smi.c
> > +++ b/drivers/memory/mtk-smi.c
>
> [...]
> > @@ -528,6 +598,53 @@ 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, "mediatek,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(dev, "larb");
>
> Please use devm_reset_control_get_exclusive() directly.
> Or use devm_reset_control_get_optional_exclusive(), which returns
> NULL
> instead of -ENOENT. That way you can ...
Thanks for your comment, I will fix it in this way.
>
> > + if (IS_ERR(larb->rst_con))
> > + return dev_err_probe(dev, PTR_ERR(larb->rst_con),
> > + "Failed to get larb reset
> > controller\n");
>
> ... suppress this error message in case of -ENOENT and return with:
>
> if (!larb->rst_con)
> return 0;
>
> here.
>
> > +
> > + 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;
> > @@ -538,6 +655,7 @@ 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))
> > @@ -554,15 +672,24 @@ static int mtk_smi_larb_probe(struct
> > platform_device *pdev)
> > if (ret < 0)
> > return ret;
> >
> > - pm_runtime_enable(dev);
> > + ret = mtk_smi_larb_parse_clamp_optional(larb);
> > + if (ret)
> > + goto err_link_remove;
> > +
> > + ret = mtk_smi_larb_parse_reset_optional(larb);
> > + if (ret && ret != -ENOENT)
>
> The ret != -ENOENT check could be dropped if you use
> devm_reset_control_get_optional_exclusive() above.
>
OK, I will fix it.
>
> regards
> Philipp
