From: Manivannan Sadhasivam <mani@kernel.org>
To: Florian Fainelli <florian.fainelli@broadcom.com>
Cc: linux-arm-kernel@lists.infradead.org,
"Vinod Koul" <vkoul@kernel.org>,
"Neil Armstrong" <neil.armstrong@linaro.org>,
"Manivannan Sadhasivam" <mani@kernel.org>,
"Rob Herring" <robh@kernel.org>,
"Krzysztof Kozlowski" <krzk+dt@kernel.org>,
"Conor Dooley" <conor+dt@kernel.org>,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
"Ray Jui" <rjui@broadcom.com>,
"Scott Branden" <sbranden@broadcom.com>,
"Broadcom internal kernel review list"
<bcm-kernel-feedback-list@broadcom.com>,
"Alan Stern" <stern@rowland.harvard.edu>,
"Rafał Miłecki" <rafal@milecki.pl>,
"Kishon Vijay Abraham I" <kishon@kernel.org>,
"Yendapally Reddy Dhananjaya Reddy"
<yendapally.reddy@broadcom.com>,
linux-phy@lists.infradead.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org
Subject: Re: [PATCH 3/9] phy: broadcom: ns-usb3: Coordinate NSP USB2 and USB3 initialization
Date: Sun, 01 Nov 2026 16:27:10 +0530 [thread overview]
Message-ID: <179353063083.2955.13880869162770253902.b4-reply@b4> (raw)
In-Reply-To: <20261021172819.668120-4-florian.fainelli@broadcom.com>
On 2026-10-21 10:28 -0700, Florian Fainelli wrote:
> The iProc SDK holds both USB2 and USB3 cores in reset while programming
> the USB3 PLL, then releases USB2 before USB3. It also enables the USB2
> IDM interface clock. The Northstar Bx initialization used by NSP does
> not perform the USB2 setup or retain the SDK settling intervals.
>
> Implement an NSP variant with the coordinated reset sequence and
> interface clock enable. Sharing one PHY between the HCDs lets the PHY
> core serialize and reference-count initialization, preventing a later
> host probe from resetting an already active USB2 controller.
>
> Retain the downstream delays around reset and MDIO operations, and
> leave both NSP cores reset if programming fails. Keep existing
> Northstar Ax and Bx reset behavior unchanged.
>
> Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com>
- Mani
next prev parent reply other threads:[~2026-11-01 10:57 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-21 17:28 [PATCH 0/9] Fix USB2 and USB3 on NSP SoCs Florian Fainelli
2026-10-21 17:28 ` [PATCH 2/9] dt-bindings: phy: bcm-ns-usb3-phy: Describe the NSP variant Florian Fainelli
2026-10-30 18:21 ` Rob Herring
2026-10-30 19:14 ` Florian Fainelli
2026-10-21 17:28 ` [PATCH 3/9] phy: broadcom: ns-usb3: Coordinate NSP USB2 and USB3 initialization Florian Fainelli
2026-11-01 10:57 ` Manivannan Sadhasivam [this message]
2026-10-21 17:28 ` [PATCH 6/9] dt-bindings: usb: generic-ehci: Add the NSP compatible Florian Fainelli
2026-10-30 18:22 ` Rob Herring (Arm)
2026-10-21 17:28 ` [PATCH 7/9] usb: host: ehci-platform: Set the FIFO threshold on NSP Florian Fainelli
2026-10-21 17:28 ` [PATCH 8/9] ARM: dts: broadcom: Identify the NSP EHCI controller Florian Fainelli
2026-10-21 17:28 ` [PATCH 9/9] ARM: dts: broadcom: Use noncoherent USB DMA on BCM958625HR Florian Fainelli
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