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Date: Tue, 16 Apr 2024 07:03:11 +0000
From: Peter Wang (王信友) <peter.wang@...iatek.com>
To: "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
"angelogioacchino.delregno@...labora.com"
<angelogioacchino.delregno@...labora.com>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-mediatek@...ts.infradead.org" <linux-mediatek@...ts.infradead.org>,
"jejb@...ux.ibm.com" <jejb@...ux.ibm.com>, "devicetree@...r.kernel.org"
<devicetree@...r.kernel.org>, "avri.altman@....com" <avri.altman@....com>,
"bvanassche@....org" <bvanassche@....org>, "martin.petersen@...cle.com"
<martin.petersen@...cle.com>, "broonie@...nel.org" <broonie@...nel.org>,
"alim.akhtar@...sung.com" <alim.akhtar@...sung.com>, "conor+dt@...nel.org"
<conor+dt@...nel.org>, "robh@...nel.org" <robh@...nel.org>,
"lgirdwood@...il.com" <lgirdwood@...il.com>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>, "krzysztof.kozlowski+dt@...aro.org"
<krzysztof.kozlowski+dt@...aro.org>, "matthias.bgg@...il.com"
<matthias.bgg@...il.com>
Subject: Re: [PATCH v4 3/8] scsi: ufs: ufs-mediatek: Remove useless
mediatek,ufs-boost-crypt property
On Mon, 2024-04-15 at 13:00 +0200, AngeloGioacchino Del Regno wrote:
> There is no need to have a property that activates the inline crypto
> boost feature, as this needs many things: a regulator, three clocks,
> and the mediatek,boost-crypt-microvolt property to be set.
>
> If any one of these is missing, the feature won't be activated,
> hence, it is useless to have yet one more property to enable that.
>
> While at it, also address another two issues:
> 1. Give back the return value to the caller and make sure to fail
> probing if we get an -EPROBE_DEFER or -ENOMEM; and
> 2. Free the ufs_mtk_crypt_cfg structure allocated in the crypto
> boost function if said functionality could not be enabled because
> it's not supported, as that'd be only wasted memory.
>
> Last but not least, move the devm_kzalloc() call for
> ufs_mtk_crypt_cfg
> to after getting the dvfsrc-vcore regulator and the boost microvolt
> property, as if those fail there's no reason to even allocate that.
>
> Fixes: ac8c2459091c ("scsi: ufs-mediatek: Decouple features from
> platform bindings")
> Signed-off-by: AngeloGioacchino Del Regno <
> angelogioacchino.delregno@...labora.com>
> ---
> drivers/ufs/host/ufs-mediatek.c | 55 ++++++++++++++++++-------------
> --
> 1 file changed, 30 insertions(+), 25 deletions(-)
>
> diff --git a/drivers/ufs/host/ufs-mediatek.c b/drivers/ufs/host/ufs-
> mediatek.c
> index 688d85909ad6..47f16e6720f4 100644
> --- a/drivers/ufs/host/ufs-mediatek.c
> +++ b/drivers/ufs/host/ufs-mediatek.c
> @@ -575,51 +575,55 @@ static int ufs_mtk_init_host_clk(struct ufs_hba
> *hba, const char *name,
> return ret;
> }
>
> -static void ufs_mtk_init_boost_crypt(struct ufs_hba *hba)
> +static int ufs_mtk_init_boost_crypt(struct ufs_hba *hba)
> {
> struct ufs_mtk_host *host = ufshcd_get_variant(hba);
> struct ufs_mtk_crypt_cfg *cfg;
> struct device *dev = hba->dev;
> struct regulator *reg;
> u32 volt;
> -
> - host->crypt = devm_kzalloc(dev, sizeof(*(host->crypt)),
> - GFP_KERNEL);
> - if (!host->crypt)
> - goto disable_caps;
> + int ret;
>
> reg = devm_regulator_get_optional(dev, "dvfsrc-vcore");
> if (IS_ERR(reg)) {
> - dev_info(dev, "failed to get dvfsrc-vcore: %ld",
> - PTR_ERR(reg));
> - goto disable_caps;
> + ret = PTR_ERR(reg);
> + if (ret == -EPROBE_DEFER)
> + return ret;
> +
> + return 0;
> }
>
> - if (of_property_read_u32(dev->of_node, "mediatek,boost-crypt-
> microvolt",
> - &volt)) {
> + ret = of_property_read_u32(dev->of_node, "mediatek,boost-crypt-
> microvolt", &volt);
> + if (ret) {
> dev_info(dev, "failed to get mediatek,boost-crypt-
> microvolt");
> - goto disable_caps;
> + return 0;
> }
>
> + host->crypt = devm_kzalloc(dev, sizeof(*host->crypt),
> GFP_KERNEL);
> + if (!host->crypt)
> + return -ENOMEM;
> +
>
Hi Angelo,
If retrun -ENOMEN, host will init fail.
But previous is skip boost crypt feature only.
It change the driver behavior.
> cfg = host->crypt;
> - if (ufs_mtk_init_host_clk(hba, "crypt_mux",
> - &cfg->clk_crypt_mux))
> - goto disable_caps;
> + ret = ufs_mtk_init_host_clk(hba, "crypt_mux", &cfg-
> >clk_crypt_mux);
> + if (ret)
> + goto out;
>
> - if (ufs_mtk_init_host_clk(hba, "crypt_lp",
> - &cfg->clk_crypt_lp))
> - goto disable_caps;
> + ret = ufs_mtk_init_host_clk(hba, "crypt_lp", &cfg-
> >clk_crypt_lp);
> + if (ret)
> + goto out;
>
> - if (ufs_mtk_init_host_clk(hba, "crypt_perf",
> - &cfg->clk_crypt_perf))
> - goto disable_caps;
> + ret = ufs_mtk_init_host_clk(hba, "crypt_perf", &cfg-
> >clk_crypt_perf);
> + if (ret)
> + goto out;
>
> cfg->reg_vcore = reg;
> cfg->vcore_volt = volt;
> host->caps |= UFS_MTK_CAP_BOOST_CRYPT_ENGINE;
>
> -disable_caps:
> - return;
> +out:
> + if (ret)
> + devm_kfree(dev, host->crypt);
> + return 0;
> }
>
> static int ufs_mtk_init_va09_pwr_ctrl(struct ufs_hba *hba)
> @@ -648,8 +652,9 @@ static int ufs_mtk_init_host_caps(struct ufs_hba
> *hba)
> struct device_node *np = hba->dev->of_node;
> int ret;
>
> - if (of_property_read_bool(np, "mediatek,ufs-boost-crypt"))
> - ufs_mtk_init_boost_crypt(hba);
> + ret = ufs_mtk_init_boost_crypt(hba);
> + if (ret)
> + return ret;
>
Most ufs-mediatek platform dosen't need "mediatek,ufs-boost-crypt"
Remove this property will casue most platform try error and add init
latency.
Thanks.
Peter
> ret = ufs_mtk_init_va09_pwr_ctrl(hba);
> if (ret)
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