From: Russell King <rmk+lkml@arm.linux.org.uk>
To: Anderson Briglia <anderson.briglia@indt.org.br>
Cc: linux-kernel@vger.kernel.org, Tony Lindgren <tony@atomide.com>
Subject: Re: [patch 3/5] MMC OMAP driver
Date: Wed, 1 Feb 2006 10:21:13 +0000 [thread overview]
Message-ID: <20060201102113.GD27735@flint.arm.linux.org.uk> (raw)
In-Reply-To: <43DF6807.9020907@indt.org.br>
On Tue, Jan 31, 2006 at 09:37:11AM -0400, Anderson Briglia wrote:
> Here are some misc fixes we've had in the OMAP tree. Might be worth
> testing them on other platforms too.
I've already provided feedback on this a year or so ago - and it
annoys me that absolutely _nothing_ has happened as a result.
The quoted part of this patch is WRONG and will _NEVER_ be merged.
You must NOT enable the clock until the power is stable. Maybe
this is a cause of the problems that you're seeing with various
cards, since you're not allowing them to reset correctly?
Fix this first, then re-test to see if every other fix you have
is actually necessary.
Sorry, but not following the power up protocol invalidates all other
testing wrt card initialisation behaviour.
> Index: linux-2.6.15-mmc_omap/drivers/mmc/mmc.c
> ===================================================================
> --- linux-2.6.15-mmc_omap.orig/drivers/mmc/mmc.c 2006-01-30 10:24:50.000000000 -0400
> +++ linux-2.6.15-mmc_omap/drivers/mmc/mmc.c 2006-01-30 10:25:19.000000000 -0400
> @@ -704,6 +704,7 @@ static void mmc_power_up(struct mmc_host
> int bit = fls(host->ocr_avail) - 1;
>
> host->ios.vdd = bit;
> + host->ios.clock = host->f_min;
> host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
> host->ios.chip_select = MMC_CS_DONTCARE;
> host->ios.power_mode = MMC_POWER_UP;
> @@ -712,7 +713,6 @@ static void mmc_power_up(struct mmc_host
>
> mmc_delay(1);
>
> - host->ios.clock = host->f_min;
> host->ios.power_mode = MMC_POWER_ON;
> host->ops->set_ios(host, &host->ios);
>
--
Russell King
Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/
maintainer of: 2.6 Serial core
prev parent reply other threads:[~2006-02-01 10:21 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-31 13:37 [patch 3/5] MMC OMAP driver Anderson Briglia
2006-01-31 15:02 ` Pierre Ossman
2006-02-01 10:21 ` Russell King [this message]
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