linux-kernel - Re: [PATCH v12 2/5] usb: renesas-xhci: Add the renesas xhci driver

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Message-ID: <81e0eff0-8b40-3c47-e39b-929e1dc07fd5@linux.intel.com>
Date:   Mon, 4 May 2020 16:01:08 +0300
From:   Mathias Nyman <mathias.nyman@...ux.intel.com>
To:     Vinod Koul <vkoul@...nel.org>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-arm-msm@...r.kernel.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Christian Lamparter <chunkeey@...glemail.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        John Stultz <john.stultz@...aro.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Andreas Böhler <dev@...ehler.at>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v12 2/5] usb: renesas-xhci: Add the renesas xhci driver

On 30.4.2020 19.59, Vinod Koul wrote:
> From: Christian Lamparter <chunkeey@...glemail.com>
> 
> This add a new driver for renesas xhci which is basically a firmware
> loader for uPD720201 and uPD720202 w/o ROM. The xhci-pci driver will
> invoke this driver for loading/unloading on relevant devices.
> 
> This patch adds a firmware loader for the uPD720201K8-711-BAC-A
> and uPD720202K8-711-BAA-A variant. Both of these chips are listed
> in Renesas' R19UH0078EJ0500 Rev.5.00 "User's Manual: Hardware" as
> devices which need the firmware loader on page 2 in order to
> work as they "do not support the External ROM".
> 
> The "Firmware Download Sequence" is describe in chapter
> "7.1 FW Download Interface" R19UH0078EJ0500 Rev.5.00 page 131.
> 
> The firmware "K2013080.mem" is available from a USB3.0 Host to
> PCIe Adapter (PP2U-E card) "Firmware download" archive. An
> alternative version can be sourced from Netgear's WNDR4700 GPL
> archives.
> 
> The release notes of the PP2U-E's "Firmware Download" ver 2.0.1.3
> (2012-06-15) state that the firmware is for the following devices:
>  - uPD720201 ES 2.0 sample whose revision ID is 2.
>  - uPD720201 ES 2.1 sample & CS sample & Mass product, ID is 3.
>  - uPD720202 ES 2.0 sample & CS sample & Mass product, ID is 2.
> 
> Signed-off-by: Christian Lamparter <chunkeey@...glemail.com>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> [vkoul: fixed comments:
> 	used macros for timeout count and delay
> 	removed renesas_fw_alive_check
> 	cleaned renesas_fw_callback
> 	removed recursion for renesas_fw_download
> 	add register defines and field names
> 	move to a separate file
> 	make fw loader as sync probe so that we execute in probe and
>         prevent race
> 	export symbols for xhci-pci to use]
> Signed-off-by: Vinod Koul <vkoul@...nel.org>
> ---
>  drivers/usb/host/Makefile           |   2 +-
>  drivers/usb/host/xhci-pci-renesas.c | 365 ++++++++++++++++++++++++++++
>  drivers/usb/host/xhci-pci.h         |  16 ++
>  3 files changed, 382 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/usb/host/xhci-pci-renesas.c
>  create mode 100644 drivers/usb/host/xhci-pci.h
> 
> diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
> index b191361257cc..f3a5a2f01874 100644
> --- a/drivers/usb/host/Makefile
> +++ b/drivers/usb/host/Makefile
> @@ -70,7 +70,7 @@ obj-$(CONFIG_USB_OHCI_HCD_DAVINCI)	+= ohci-da8xx.o
>  obj-$(CONFIG_USB_UHCI_HCD)	+= uhci-hcd.o
>  obj-$(CONFIG_USB_FHCI_HCD)	+= fhci.o
>  obj-$(CONFIG_USB_XHCI_HCD)	+= xhci-hcd.o
> -obj-$(CONFIG_USB_XHCI_PCI)	+= xhci-pci.o
> +obj-$(CONFIG_USB_XHCI_PCI)	+= xhci-pci.o xhci-pci-renesas.o

Hmm, now we end up with two modules, xhci-pci and xhci-pci-renesas, even if
xhci-pci-renesas just includes helper functions to load firmware for renesas.

My kbuild knowledge is limited, but one way to solve this would be to 
rename xhci-pci.c to xhci-pci-core.c and add:

xhci-pci-y := xhci-pci-core.o xhci-pci-renesas.o

unless someone can suggest a better way to solve this

-Mathias