linux-kernel - Re: SDHCI: mdelay() in hot path in esdhc_pltfm_set

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Message-ID: <CAOpc7mGgD1c4BW1DXEEZQ06njQO6tgUKi0ssAGyL4SJXajDRGw@mail.gmail.com>
Date:	Wed, 8 Jul 2015 08:22:57 +0200
From:	Holger Schurig <holgerschurig@...il.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Fabio Estevam <festevam@...il.com>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	Chris Ball <chris@...ntf.net>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	open list <linux-kernel@...r.kernel.org>,
	Dong Aisheng <b29396@...escale.com>,
	Sascha Hauer <kernel@...gutronix.de>
Subject: Re: SDHCI: mdelay() in hot path in esdhc_pltfm_set_clock looses CAN
 (!) frames

Wow, at last some reaction. And I thought nobody cares ...

BTW, removing CONFIG_MMC_CLKGATE helped a bit, because the pointless
clock-off-clock-on while the device is booting (or accessing multiple
sectors within a short time) isn't going to happen anymore.

But really, a mdelay(1) in a driver ...
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