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dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="TgSmzxS3" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C606C1F000E9; Thu, 30 Jul 2026 10:41:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1785408085; bh=CjTAtVu3KYZkXZ9wcCH77hKReMY6yFhPPMguW0zSoE0=; h=From:Subject:Reply-To:To:Cc:In-Reply-To:References:Date; b=TgSmzxS3ZqCA3e3E/Gm+5p0Di4rNoybGAC1GY8FPo7oxFf9gvys5RfCw+1qKLaS4L M0kqQpH1I4nKIHzuUKVxOWMd65/jx/8d1lhSxXli4dogu1cIoc9pTgwAOLvR00hCig 3prCn5S7z+VDvpyLQY54+U4Dveo7zLuHwRgX1GT/NxWyaoDAYrUakmFXYrthLnpyGP 2q42770o0Figw4+0YlV/n3xzJ4x3BLUrOo1LrUdsSRXgnm/kJZ6Kl+OLqhzb6J/ZRK Yrc7BAtg29zegEGXUaqL1Z++BPYb4O/LIeUIOn7qdUGhgmG01wwldxivJhWfHDzM69 kzdU55FtL3HVw== From: sashiko-bot@kernel.org Subject: Re: [PATCH v10 18/26] scsi: ufs: mediatek: Don't acquire dvfsrc-vcore twice Reply-To: sashiko-reviews@lists.linux.dev To: "Louis-Alexis Eyraud" Cc: conor+dt@kernel.org, olteanv@gmail.com, neil.armstrong@linaro.org, devicetree@vger.kernel.org, linux-scsi@vger.kernel.org, vkoul@kernel.org, robh@kernel.org, linux-phy@lists.infradead.org In-Reply-To: <20260730-mt8196-ufs-v10-18-bc5ecef202dc@collabora.com> References: <20260730-mt8196-ufs-v10-0-bc5ecef202dc@collabora.com> <20260730-mt8196-ufs-v10-18-bc5ecef202dc@collabora.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Date: Thu, 30 Jul 2026 10:41:24 +0000 Message-Id: <20260730104124.C606C1F000E9@smtp.kernel.org> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Thank you for your contribution! Sashiko AI review found 1 potential issue(= s) to consider: - [High] Consolidating `dvfsrc-vcore` into a single shared regulator handle= prevents the regulator core from aggregating voltage constraints, causing = independent features to overwrite each other's voltage requests and leading= to hardware undervoltage. -- --- Patch [18]: [PATCH v10 18/26] scsi: ufs: mediatek: Don't acquire dvfsrc= -vcore twice --- commit f445ade145082cbe60e3dee2e8a70aa32aec9d9b Author: Nicolas Frattaroli scsi: ufs: mediatek: Don't acquire dvfsrc-vcore twice This patch consolidates the dvfsrc-vcore regulator into a single shared handle on the host structure, rather than acquiring two separate references. > diff --git a/drivers/ufs/host/ufs-mediatek.c b/drivers/ufs/host/ufs-media= tek.c > index 0821de5b8a8fc..8214cf0b3a169 100644 > --- a/drivers/ufs/host/ufs-mediatek.c > +++ b/drivers/ufs/host/ufs-mediatek.c [ ... ] > @@ -2005,7 +1998,7 @@ static void _ufs_mtk_clk_scale(struct ufs_hba *hba,= bool scale_up) > } > =20 > if (clk_bind_vcore) { > - ret =3D regulator_set_voltage(reg, 0, INT_MAX); > + ret =3D regulator_set_voltage(host->reg_vcore, 0, INT_MAX); [Severity: High] Will consolidating to a single host->reg_vcore handle prevent the regulator core from properly aggregating voltage constraints? During a clock scale-down, ufs_mtk_clk_scale_notify() runs _ufs_mtk_clk_sca= le() with scale_up =3D false during the pre-change notification phase. Since host->reg_vcore is now a single shared consumer handle, calling regulator_set_voltage() with 0V here will immediately drop the physical voltage constraint. However, the crypto boost clock isn't downclocked until the post-change notification phase calls ufs_mtk_boost_crypt(). Can this violate DVFS constraints and cause a hardware undervoltage by dropping the voltage while the crypto clock is still running at high frequency? It appears the regulator core relies on separate consumer handles to aggreg= ate maximum voltage requests across independent features like clock scaling and crypto boost, which might explain why two separate references were original= ly used. > if (ret) { > dev_err(hba->dev, "%s: Failed to set vcore to minimum: %pe\n", > __func__, ERR_PTR(ret)); --=20 Sashiko AI review =C2=B7 https://sashiko.dev/#/patchset/20260730-mt8196-ufs= -v10-0-bc5ecef202dc@collabora.com?part=3D18