From: "Arnd Bergmann" <arnd@arndb.de>
To: "Aaro Koskinen" <aaro.koskinen@iki.fi>
Cc: "Tony Lindgren" <tony@atomide.com>,
"Lukas Bulwahn" <lukas.bulwahn@gmail.com>,
"Janusz Krzysztofik" <jmkrzyszt@gmail.com>,
"Krzysztof Kozlowski" <krzysztof.kozlowski@linaro.org>,
linux-arm-kernel@lists.infradead.org,
Linux-OMAP <linux-omap@vger.kernel.org>,
linux-usb@vger.kernel.org, linux-samsung-soc@vger.kernel.org,
kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 3/4] usb: remove OMAP USB Device Controller and OHCI support for OMAP1/2 chips
Date: Thu, 12 Jan 2023 15:31:20 +0100 [thread overview]
Message-ID: <179739a0-5d75-412b-964b-16d5cb6d306d@app.fastmail.com> (raw)
In-Reply-To: <20230112140524.GK730856@darkstar.musicnaut.iki.fi>
On Thu, Jan 12, 2023, at 15:05, Aaro Koskinen wrote:
> On Thu, Jan 12, 2023 at 11:19:53AM +0100, Arnd Bergmann wrote:
>> On Thu, Jan 12, 2023, at 10:53, Tony Lindgren wrote:
>>
>> So if we want to kill off the old DMA stuff there is actually
>> a choice between either making omap_udc PIO-only or converting
>> it to use the standard dmaengine interface.
>
> I use this driver on Palm TE and 770, and without it those boards would
> be useless for my use cases. Also DMA doubles the throughput, probably
> also power usage is smaller.
Ok, if the performance is important, converting to dmaengine
is probably best. Do you know if this is just a straightforward
replacement of the function calls, or are there technical reasons
why it's not using the dmaengine interface yet?
Arnd
next prev parent reply other threads:[~2023-01-12 14:42 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-12 8:37 [PATCH 0/4] Further code removal after Arnd's latest cleanup Lukas Bulwahn
2023-01-12 8:37 ` [PATCH 1/4] ARM: s3c: remove obsolete s3c-cpu-freq header Lukas Bulwahn
2023-01-12 8:57 ` Krzysztof Kozlowski
2023-01-12 8:37 ` [PATCH 2/4] ARM: pxa: remove further dead code after pxa93 support removal Lukas Bulwahn
2023-01-12 9:05 ` Arnd Bergmann
2023-01-12 9:26 ` Lukas Bulwahn
2023-01-12 10:30 ` Arnd Bergmann
2023-01-12 8:37 ` [PATCH 4/4] ARM: debug: remove references in DEBUG_UART_8250_SHIFT to removed configs Lukas Bulwahn
[not found] ` <20230112083746.9551-4-lukas.bulwahn@gmail.com>
2023-01-12 9:02 ` [PATCH 3/4] usb: remove OMAP USB Device Controller and OHCI support for OMAP1/2 chips Arnd Bergmann
2023-01-12 9:19 ` Lukas Bulwahn
2023-01-12 9:53 ` Arnd Bergmann
2023-01-12 9:53 ` Tony Lindgren
2023-01-12 10:19 ` Arnd Bergmann
2023-01-12 14:05 ` Aaro Koskinen
2023-01-12 14:31 ` Arnd Bergmann [this message]
2023-01-13 7:14 ` Tony Lindgren
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