linux-kernel - Re: [PATCH 03/22] ARM: omap1: move omap15xx local bus handling to usb.c

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Message-ID: <87y302ewer.fsf@gmail.com>
Date:   Fri, 09 Aug 2019 08:32:28 +0300
From:   Felipe Balbi <felipe.balbi@...ux.intel.com>
To:     Arnd Bergmann <arnd@...db.de>, Tony Lindgren <tony@...mide.com>,
        Aaro Koskinen <aaro.koskinen@....fi>,
        Alan Stern <stern@...land.harvard.edu>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        Arnd Bergmann <arnd@...db.de>,
        Russell King <linux@...linux.org.uk>,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH 03/22] ARM: omap1: move omap15xx local bus handling to usb.c

Arnd Bergmann <arnd@...db.de> writes:

> The mach/memory.h file only exists to implement a dma offset for "Local
> Bus" devices, and that consists of the OHCI USB controller for practical
> purposes.
>
> The generic dma-mapping interface has gained this exact feature some
> years ago and can do it much more efficiently, so replace the complex
> __arch_virt_to_dma/__arch_dma_to_pfn/... logic with a much simpler boot
> time initialization.
>
> This should also make any code that performs dma mapping calls at
> runtime much more efficient, by eliminating the strcmp() along with
> the computation.
>
> Similar, a portion of the ohci-omap driver is just there for configuring
> the memory translation, this too can get moved into usb.c
>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

For all of these patches related to usb:

Acked-by: Felipe Balbi <felipe.balbi@...ux.intel.com>

Thanks for cleaning this up, Arnd.

-- 
balbi