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[117.20.68.32]) by smtp.gmail.com with UTF8SMTPSA id 20-20020a17090a199400b0027d0adf653bsm2172484pji.7.2023.11.02.01.24.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 02 Nov 2023 01:24:19 -0700 (PDT) Date: Thu, 02 Nov 2023 08:24:06 +0000 Message-Id: <20231102082406.1555227-1-nathan@nathanrossi.com> From: Nathan Rossi To: devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Nathan Rossi , Nathan Rossi , Li Jun , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , NXP Linux Team Subject: [PATCH] arm64: dts: imx8mp: imx8mq: Add parkmode-disable-ss-quirk on DWC3 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Nathan Rossi The i.MX8MP and i.MX8MQ devices both use the same DWC3 controller and are both affected by a known issue with the controller due to specific behaviour when park mode is enabled in SuperSpeed host mode operation. Under heavy USB traffic from multiple endpoints the controller will sometimes incorrectly process transactions such that some transactions are lost, or the controller may hang when processing transactions. When the controller hangs it does not recover. This issue is documented partially within the linux-imx vendor kernel which references a Synopsys STAR number 9001415732 in commits [1] and additional details in [2]. Those commits provide some additional controller internal implementation specifics around the incorrect behaviour of the SuperSpeed host controller operation when park mode is enabled. The summary of this issue is that the host controller can incorrectly enter/exit park mode such that part of the controller is in a state which behaves as if in park mode even though it is not. In this state the controller incorrectly calculates the number of TRBs available which results in incorrect access of the internal caches causing the overwrite of pending requests in the cache which should have been processed but are ignored. This can cause the controller to drop the requests or hang waiting for the pending state of the dropped requests. The workaround for this issue is to disable park mode for SuperSpeed operation of the controller through the GUCTL1[17] bit. This is already available as a quirk for the DWC3 controller and can be enabled via the 'snps,parkmode-disable-ss-quirk' device tree property. It is possible to replicate this failure on an i.MX8MP EVK with a USB Hub connecting 4 SuperSpeed USB flash drives. Performing continuous small read operations (dd if=3D/dev/sd... of=3D/dev/null bs=3D16) on the bl= ock devices will result in device errors initially and will eventually result in the controller hanging. [13240.896936] xhci-hcd xhci-hcd.0.auto: WARN Event TRB for slot 4 ep 2 w= ith no TDs queued? [13240.990708] usb 2-1.3: reset SuperSpeed USB device number 5 using xhci= -hcd [13241.015582] sd 2:0:0:0: [sdc] tag#0 UNKNOWN(0x2003) Result: hostbyte= =3D0x07 driverbyte=3DDRIVER_OK cmd_age=3D0s [13241.025198] sd 2:0:0:0: [sdc] tag#0 CDB: opcode=3D0x28 28 00 00 00 03 = e0 00 01 00 00 [13241.032949] I/O error, dev sdc, sector 992 op 0x0:(READ) flags 0x80700= phys_seg 25 prio class 2 [13272.150710] usb 2-1.2: reset SuperSpeed USB device number 4 using xhci= -hcd [13272.175469] sd 1:0:0:0: [sdb] tag#0 UNKNOWN(0x2003) Result: hostbyte= =3D0x03 driverbyte=3DDRIVER_OK cmd_age=3D31s [13272.185365] sd 1:0:0:0: [sdb] tag#0 CDB: opcode=3D0x28 28 00 00 00 03 = e0 00 01 00 00 [13272.193385] I/O error, dev sdb, sector 992 op 0x0:(READ) flags 0x80700= phys_seg 18 prio class 2 [13434.846556] xhci-hcd xhci-hcd.0.auto: xHCI host not responding to stop= endpoint command [13434.854592] xhci-hcd xhci-hcd.0.auto: xHCI host controller not respond= ing, assume dead [13434.862553] xhci-hcd xhci-hcd.0.auto: HC died; cleaning up [1] https://github.com/nxp-imx/linux-imx/commit/97a5349d936b08cf301730b59e4= e8855283f815c [2] https://github.com/nxp-imx/linux-imx/commit/b4b5cbc5a12d7c3b920d1d7cba0= ada3379e4e42b Signed-off-by: Nathan Rossi Reviewed-by: Fabio Estevam --- arch/arm64/boot/dts/freescale/imx8mp.dtsi | 2 ++ arch/arm64/boot/dts/freescale/imx8mq.dtsi | 2 ++ 2 files changed, 4 insertions(+) diff --git a/arch/arm64/boot/dts/freescale/imx8mp.dtsi b/arch/arm64/boot/dt= s/freescale/imx8mp.dtsi index c9a610ba48..1264da6012 100644 --- a/arch/arm64/boot/dts/freescale/imx8mp.dtsi +++ b/arch/arm64/boot/dts/freescale/imx8mp.dtsi @@ -2072,6 +2072,7 @@ usb_dwc3_0: usb@38100000 { phys =3D <&usb3_phy0>, <&usb3_phy0>; phy-names =3D "usb2-phy", "usb3-phy"; snps,gfladj-refclk-lpm-sel-quirk; + snps,parkmode-disable-ss-quirk; }; =20 }; @@ -2114,6 +2115,7 @@ usb_dwc3_1: usb@38200000 { phys =3D <&usb3_phy1>, <&usb3_phy1>; phy-names =3D "usb2-phy", "usb3-phy"; snps,gfladj-refclk-lpm-sel-quirk; + snps,parkmode-disable-ss-quirk; }; }; =20 diff --git a/arch/arm64/boot/dts/freescale/imx8mq.dtsi b/arch/arm64/boot/dt= s/freescale/imx8mq.dtsi index 4b1ce9fc17..c6dc3ba0d4 100644 --- a/arch/arm64/boot/dts/freescale/imx8mq.dtsi +++ b/arch/arm64/boot/dts/freescale/imx8mq.dtsi @@ -1649,6 +1649,7 @@ usb_dwc3_0: usb@38100000 { phys =3D <&usb3_phy0>, <&usb3_phy0>; phy-names =3D "usb2-phy", "usb3-phy"; power-domains =3D <&pgc_otg1>; + snps,parkmode-disable-ss-quirk; status =3D "disabled"; }; =20 @@ -1680,6 +1681,7 @@ usb_dwc3_1: usb@38200000 { phys =3D <&usb3_phy1>, <&usb3_phy1>; phy-names =3D "usb2-phy", "usb3-phy"; power-domains =3D <&pgc_otg2>; + snps,parkmode-disable-ss-quirk; status =3D "disabled"; }; =20 --- 2.42.0