| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <e18bf1ba05c86b26fb4f18c444a19b391df29c55.camel@mediatek.com>
Date: Fri, 22 Nov 2024 09:41:13 +0000
From: Friday Yang (杨阳) <Friday.Yang@...iatek.com>
To: "robh@...nel.org" <robh@...nel.org>, "matthias.bgg@...il.com"
<matthias.bgg@...il.com>, Yong Wu (吴勇)
<Yong.Wu@...iatek.com>, "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
"conor+dt@...nel.org" <conor+dt@...nel.org>, "krzk@...nel.org"
<krzk@...nel.org>, 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 v2 2/2] memory: mtk-smi: mt8188: Add SMI clamp function
On Wed, 2024-11-20 at 08:49 +0100, Krzysztof Kozlowski wrote:
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
>
>
> On 20/11/2024 07:36, Friday Yang wrote:
> > In order to avoid handling glitch signal when MTCMOS on/off, SMI
> > need
> > clamp and reset operation. Parse power reset settings for LARBs
> > which
> > need to reset. Register genpd callback for SMI LARBs and apply
> > reset
> > operations in the callback.
> >
> > Signed-off-by: Friday Yang <friday.yang@...iatek.com>
> > ---
> > drivers/memory/mtk-smi.c | 175
> > ++++++++++++++++++++++++++++++++++++++-
> > 1 file changed, 171 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/memory/mtk-smi.c b/drivers/memory/mtk-smi.c
> > index 2bc034dff691..c7119f655350 100644
> > --- a/drivers/memory/mtk-smi.c
> > +++ b/drivers/memory/mtk-smi.c
> > @@ -10,15 +10,21 @@
> > #include <linux/err.h>
> > #include <linux/io.h>
> > #include <linux/iopoll.h>
> > +#include <linux/mfd/syscon.h>
>
> Where do you use it?
device_node_to_regmap need this header file.
>
> > #include <linux/module.h>
> > #include <linux/of.h>
> > #include <linux/of_platform.h>
> > #include <linux/platform_device.h>
> > +#include <linux/pm_domain.h>
>
> Where do you use it?
dev_pm_genpd_add_notifier need this header file.
>
> > #include <linux/pm_runtime.h>
> > +#include <linux/regmap.h>
>
> Where do you use it?
regmap_write need this header file.
>
> > +#include <linux/reset.h>
> > +#include <linux/reset-controller.h>
> > #include <linux/soc/mediatek/mtk_sip_svc.h>
> > #include <soc/mediatek/smi.h>
> > #include <dt-bindings/memory/mt2701-larb-port.h>
> > #include <dt-bindings/memory/mtk-memory-port.h>
> > +#include <dt-bindings/reset/mt8188-resets.h>
> >
>
> ...
reset_control_reset/devm_reset_control_get need reset.h
But reset-controller.h could be removed.
MT8188_SMI_RST_LARB10 and other index need mt8188-resets.h
>
> >
> > +static int mtk_smi_larb_parse_clamp_info(struct mtk_smi_larb
> > *larb)
> > +{
> > + struct device *dev = larb->dev;
> > + const struct mtk_smi_larb_gen *larb_gen = larb->larb_gen;
> > + struct device_node *smi_node;
> > + struct of_phandle_args args;
> > + int ret, index;
> > +
> > + /* Only SMI LARBs located in camera and image subsys need to
>
> Use Linux coding style.
Sorry for the mistake, I will fix it.
>
> > + * apply clamp and reset operation, others can be skipped.
> > + */
> > + ret = of_parse_phandle_with_fixed_args(dev->of_node,
> > + "resets", 1, 0,
> > &args);
>
> NAK
>
> > + if (ret)
> > + return 0;
> > +
> > + smi_node = of_parse_phandle(dev->of_node, "mediatek,smi", 0);
> > + if (!smi_node)
> > + return -EINVAL;
> > +
> > + index = args.args[0];
>
> That's reset, not clamp port. NAK.
I could change from 'clamp_port' to 'reset_port'.
This index is used for getting the port id from the array
'mtk_smi_larb_clamp_port_mt8188 ' in SMI driver.
It could also be used for getting the reset signal in
SMI reset controller driver.
>
> > + larb->sub_comm_inport = larb_gen->clamp_port[index];
> > + larb->sub_comm_syscon = device_node_to_regmap(smi_node);
> > + of_node_put(smi_node);
> > +
> > + if (IS_ERR(larb->sub_comm_syscon) ||
> > + larb->sub_comm_inport >= SMI_SUB_COMM_INPORT_NR) {
> > + larb->sub_comm_syscon = NULL;
> > + return -EINVAL;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static int mtk_smi_larb_parse_reset_info(struct mtk_smi_larb
> > *larb)
> > +{
> > + struct device *dev = larb->dev;
> > + int ret;
> > +
> > + /* Only SMI LARBs located in camera and image subsys need to
>
> Use Linux coding style. This applies to all your patches and all
> places
> in this patch.
OK, I will fix it.
>
> > + * apply clamp and reset operation, others can be skipped.
> > + */
> > + if (!of_find_property(dev->of_node, "resets", NULL))
>
> That's not how you use reset framework API. Use proper optional API.
Thanks, I will check the return value for devm_reset_control_get
instead of parsing 'resets' here.
>
> > + return 0;
> > +
> > + larb->rst_con = devm_reset_control_get(dev, "larb");
> > + if (IS_ERR(larb->rst_con))
> > + return dev_err_probe(dev, PTR_ERR(larb->rst_con),
> > + "Can not get larb reset
> > controller\n");
> > +
> > + larb->nb.notifier_call = mtk_smi_genpd_callback;
> > + ret = dev_pm_genpd_add_notifier(dev, &larb->nb);
> > + if (ret) {
> > + dev_err(dev, "Failed to add genpd callback %d\n",
> > ret);
> > + return -EINVAL;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > static int mtk_smi_larb_probe(struct platform_device *pdev)
> > {
> > struct mtk_smi_larb *larb;
> > @@ -538,6 +685,7 @@ 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 +702,29 @@ static int mtk_smi_larb_probe(struct
> > platform_device *pdev)
> > if (ret < 0)
> > return ret;
> >
> > - pm_runtime_enable(dev);
> > + /* find sub common to clamp larb for ISP software reset */
> > + ret = mtk_smi_larb_parse_clamp_info(larb);
> > + if (ret) {
> > + dev_err(dev, "Failed to get clamp setting for
> > larb\n");
> > + goto err_link_remove;
> > + }
> > +
> > + ret = mtk_smi_larb_parse_reset_info(larb);
> > + if (ret) {
> > + dev_err(dev, "Failed to get power setting for
> > larb\n");
> > + goto err_link_remove;
> > + }
> > +
> > platform_set_drvdata(pdev, larb);
> > ret = component_add(dev, &mtk_smi_larb_component_ops);
> > if (ret)
> > - goto err_pm_disable;
> > + goto err_link_remove;
> > +
> > + pm_runtime_enable(dev);
> > +
> > return 0;
> >
> > -err_pm_disable:
> > - pm_runtime_disable(dev);
> > +err_link_remove:
> > device_link_remove(dev, larb->smi_common_dev);
> > return ret;
> > }
> > @@ -686,6 +848,10 @@ 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,
> > +};
> > +
> > static const struct mtk_smi_common_plat mtk_smi_common_mt8192 = {
> > .type = MTK_SMI_GEN2,
> > .has_gals = true,
> > @@ -729,6 +895,7 @@ 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},
>
>
> Best regards,
> Krzysztof
Powered by blists - more mailing lists