linux-kernel - Re: [PATCH] usb: gadget: Mark USB_FSL

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Date:   Wed, 27 Oct 2021 09:37:54 -0500
From:   Li Yang <leoyang.li@....com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH] usb: gadget: Mark USB_FSL_QE broken on 64-bit

On Wed, Oct 27, 2021 at 5:25 AM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>
> On 64-bit:
>
>     drivers/usb/gadget/udc/fsl_qe_udc.c: In function ‘qe_ep0_rx’:
>     drivers/usb/gadget/udc/fsl_qe_udc.c:842:13: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
>       842 |     vaddr = (u32)phys_to_virt(in_be32(&bd->buf));
>           |             ^
>     In file included from drivers/usb/gadget/udc/fsl_qe_udc.c:41:
>     drivers/usb/gadget/udc/fsl_qe_udc.c:843:28: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
>       843 |     frame_set_data(pframe, (u8 *)vaddr);
>           |                            ^
>
> The driver assumes physical and virtual addresses are 32-bit, hence it
> cannot work on 64-bit platforms.

The device is truly only used in legacy 32-bit PowerPC chips and never
tested with 64-bit.  Thanks.

>
> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>

Acked-by: Li Yang <leoyang.li@....com>

> ---
> One more casualty of CONFIG_WERROR=y.
> http://kisskb.ellerman.id.au/kisskb/buildresult/14652936/
> ---
>  drivers/usb/gadget/udc/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/usb/gadget/udc/Kconfig b/drivers/usb/gadget/udc/Kconfig
> index 8c614bb86c665c77..69394dc1cdfb6436 100644
> --- a/drivers/usb/gadget/udc/Kconfig
> +++ b/drivers/usb/gadget/udc/Kconfig
> @@ -330,6 +330,7 @@ config USB_AMD5536UDC
>  config USB_FSL_QE
>         tristate "Freescale QE/CPM USB Device Controller"
>         depends on FSL_SOC && (QUICC_ENGINE || CPM)
> +       depends on !64BIT || BROKEN
>         help
>            Some of Freescale PowerPC processors have a Full Speed
>            QE/CPM2 USB controller, which support device mode with 4
> --
> 2.25.1
>