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From: Pierre Ossman <pierre@ossman.eu>
To: Linus Walleij <linus.walleij@linaro.org>,
	"Steven J. Hill" <Steven.Hill@cavium.com>,
	Vinod Koul <vinod.koul@intel.com>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
	"linux-mmc@vger.kernel.org" <linux-mmc@vger.kernel.org>,
	Ulf Hansson <ulf.hansson@linaro.org>,
	Adrian Hunter <adrian.hunter@intel.com>,
	linux-block@vger.kernel.org, Jens Axboe <axboe@kernel.dk>,
	Christoph Hellwig <hch@lst.de>, Arnd Bergmann <arnd@arndb.de>,
	Paolo Valente <paolo.valente@linaro.org>,
	Daniel Mack <daniel@zonque.org>,
	Marc Zyngier <marc.zyngier@arm.com>
Subject: Re: [RFC PATCH] mmc: core: Remove CONFIG_MMC_BLOCK_BOUNCE option.
Date: Tue, 23 May 2017 20:24:41 +0200	[thread overview]
Message-ID: <e38eb2c8-db91-1a36-925d-aa88be56a40b@ossman.eu> (raw)
In-Reply-To: <CACRpkdYV2KfyRL6eweie3Yb-Em7L9X6Y3k=SOqO107oUX9MNbw@mail.gmail.com>

On 23/05/17 11:05, Linus Walleij wrote:
> 
> Pierre, what host were you developing this for? Maybe I can try
> to get the same and test it.
> 

I think the work primarily was done with the Texas Instruments SDHCI 
host that HP used in their laptops. Ricoh controllers were also popular, 
but they had some proprietary mode that you had to get them out of.

If I recall correctly, all early SDHCI controllers needed this feature. 
I think scatter/gather was a later addition to the spec.

I take it updates to the SD specification hasn't fixed this performance 
issue?

Regards
-- 
Pierre Ossman

  parent reply	other threads:[~2017-05-23 18:24 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-05-10  8:24 [PATCH 0/5] mmc: core: modernize ioctl() requests Linus Walleij
2017-05-10  8:24 ` [PATCH 1/5] mmc: core: Delete bounce buffer Kconfig option Linus Walleij
2017-05-15 11:55   ` Ulf Hansson
2017-05-15 14:04   ` Bartlomiej Zolnierkiewicz
2017-05-18  7:48     ` Linus Walleij
2017-05-19  7:30       ` [RFC PATCH] mmc: core: Remove CONFIG_MMC_BLOCK_BOUNCE option Steven J. Hill
2017-05-23  9:05         ` Linus Walleij
2017-05-23 10:08           ` Arnd Bergmann
2017-05-23 18:24           ` Pierre Ossman [this message]
2017-05-10  8:24 ` [PATCH 2/5] mmc: core: Allocate per-request data using the block layer core Linus Walleij
2017-05-16  9:02   ` Ulf Hansson
2017-05-18  8:01     ` Linus Walleij
2017-05-16 11:54   ` Adrian Hunter
2017-05-18  8:21     ` Linus Walleij
2017-05-18 12:42       ` Adrian Hunter
2017-05-18 13:31         ` Linus Walleij
2017-05-10  8:24 ` [PATCH 3/5] mmc: block: Tag is_rpmb as bool Linus Walleij
2017-05-10  8:24 ` [PATCH 4/5] mmc: block: move single ioctl() commands to block requests Linus Walleij
2017-05-16  9:15   ` Ulf Hansson
2017-05-23  8:14   ` Avri Altman
2017-05-23  8:14     ` Avri Altman
2017-05-10  8:24 ` [PATCH 5/5] mmc: block: move multi-ioctl() to use block layer Linus Walleij
2017-05-12 21:09   ` Avri Altman
2017-05-12 21:09     ` Avri Altman
2017-05-18  9:26     ` Linus Walleij
2017-05-16  9:21   ` Ulf Hansson
2017-05-23  9:21   ` Avri Altman
2017-05-23  9:21     ` Avri Altman
2017-05-23 10:51   ` Avri Altman
2017-05-23 10:51     ` Avri Altman
2017-05-11 21:08 ` [PATCH 0/5] mmc: core: modernize ioctl() requests Ulf Hansson

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