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Date: Tue, 2 Feb 2021 01:53:02 +0000
From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
To: Pali Rohár <pali@...nel.org>,
Mathias Nyman <mathias.nyman@...el.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Gregory CLEMENT <gregory.clement@...tlin.com>,
Miquel Raynal <miquel.raynal@...tlin.com>,
Peter Chen <peter.chen@....com>
CC: Tomasz Maciej Nowak <tmn505@...il.com>,
"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Jun Li <jun.li@....com>, Marek Behun <marek.behun@....cz>
Subject: RE: [PATCH v2] usb: host: xhci: mvebu: make USB 3.0 PHY optional for
Armada 3720
Hi Pali,
> From: Pali Rohár, Sent: Tuesday, February 2, 2021 12:08 AM
>
> Older ATF does not provide SMC call for USB 3.0 phy power on functionality
> and therefore initialization of xhci-hcd is failing when older version of
> ATF is used. In this case phy_power_on() function returns -EOPNOTSUPP.
>
> [ 3.108467] mvebu-a3700-comphy d0018300.phy: unsupported SMC call, try updating your firmware
> [ 3.117250] phy phy-d0018300.phy.0: phy poweron failed --> -95
> [ 3.123465] xhci-hcd: probe of d0058000.usb failed with error -95
>
> This patch introduces a new plat_setup callback for xhci platform drivers
> which is called prior calling usb_add_hcd() function. This function at its
> beginning skips PHY init if hcd->skip_phy_initialization is set.
>
> Current init_quirk callback for xhci platform drivers is called from
> xhci_plat_setup() function which is called after chip reset completes.
> It happens in the middle of the usb_add_hcd() function and therefore this
> callback cannot be used for setting if PHY init should be skipped or not.
>
> For Armada 3720 this patch introduce a new xhci_mvebu_a3700_plat_setup()
> function configured as a xhci platform plat_setup callback. This new
> function calls phy_power_on() and in case it returns -EOPNOTSUPP then
> XHCI_SKIP_PHY_INIT quirk is set to instruct xhci-plat to skip PHY
> initialization.
>
> This patch fixes above failure by ignoring 'not supported' error in
> xhci-hcd driver. In this case it is expected that phy is already power on.
>
> It fixes initialization of xhci-hcd on Espressobin boards where is older
> Marvell's Arm Trusted Firmware without SMC call for USB 3.0 phy power.
>
> This is regression introduced in commit bd3d25b07342 ("arm64: dts: marvell:
> armada-37xx: link USB hosts with their PHYs") where USB 3.0 phy was defined
> and therefore xhci-hcd on Espressobin with older ATF started failing.
>
> Signed-off-by: Pali Rohár <pali@...nel.org>
> Tested-by: Tomasz Maciej Nowak <tmn505@...il.com>
> Fixes: bd3d25b07342 ("arm64: dts: marvell: armada-37xx: link USB hosts with their PHYs")
> Cc: <stable@...r.kernel.org> # 5.1+: ea17a0f153af: phy: marvell: comphy: Convert internal SMCC firmware return codes to
> errno
> Cc: <stable@...r.kernel.org> # 5.1+: f768e718911e: usb: host: xhci-plat: add priv quirk for skip PHY initialization
Thank you for the patch!
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com> # xhci-plat
Also, I tested on my environment and didn't cause any regression.
So,
Tested-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com> # On R-Car
Best regards,
Yoshihiro Shimoda
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