From: Wolfram Sang <w.sang@pengutronix.de>
To: Philip Rakity <prakity@marvell.com>
Cc: Adrian Hunter <adrian.hunter@nokia.com>,
"linux-mmc@vger.kernel.org" <linux-mmc@vger.kernel.org>,
Mark Brown <markb@marvell.com>
Subject: Re: [PATCH] sdhci: allow for eMMC 74 clock generation by controller
Date: Wed, 22 Sep 2010 10:56:54 +0200 [thread overview]
Message-ID: <20100922085654.GA2693@pengutronix.de> (raw)
In-Reply-To: <15EE115E-4B8A-4314-BD7A-3FB24A1F1BB6@marvell.com>
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Hi,
> Patch attached. We are in a chicken and egg situation. The controller
> needs data to cause the clock to start and the first command sent by the
> mmc layer is CMD0 -- mmc_go_idle(). This is sent without the eMMC chip
> seeing the 74 clocks but since there are NOW clocks the chip see's this.
> It is not able to parse the command and we are struck.
Okay, and some host->ops->generate_initial_74_clocks() could help you
out, it seems. If it is a controller specific issue, the approach seems
in general sensible to me, unless I am missing some details.
Regards,
Wolfram
--
Pengutronix e.K. | Wolfram Sang |
Industrial Linux Solutions | http://www.pengutronix.de/ |
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next prev parent reply other threads:[~2010-09-22 8:56 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-12 5:17 RE: Bug in mmc.c == stops eMMC toshiba from working - sector check not good (PATCH) Philip Rakity
2010-03-13 5:09 ` Patch: eMMC boot partition needs to be deactivated for linux to find user partitions Philip Rakity
2010-03-15 8:08 ` Adrian Hunter
2010-03-15 18:32 ` Features vs versions (Was: Patch: eMMC boot partition needs to be deactivated for linux to find user partitions) Edward Falk
2010-03-15 18:54 ` Johnson, Charles F
2010-03-16 1:44 ` Patch: eMMC boot partition needs to be deactivated for linux to find user partitions Philip Rakity
2010-03-20 5:12 ` Philip Rakity
2010-03-22 8:25 ` Adrian Hunter
[not found] ` <639D1595-D908-473C-9A41-71B493DCD0C0@marvell.com>
2010-03-29 7:12 ` Adrian Hunter
2010-09-19 21:46 ` [PATCH] sdhci: add quirk for controllers that don't support write only detect Philip Rakity
2010-09-20 6:14 ` Wolfram Sang
2010-09-20 16:00 ` Philip Rakity
2010-09-21 5:43 ` [PATCH] sdhci: allow for eMMC 74 clock generation by controller Philip Rakity
2010-09-21 6:04 ` Adrian Hunter
2010-09-21 15:06 ` Philip Rakity
2010-09-21 16:58 ` Wolfram Sang
[not found] ` <15EE115E-4B8A-4314-BD7A-3FB24A1F1BB6@marvell.com>
2010-09-22 8:56 ` Wolfram Sang [this message]
2010-09-22 7:57 ` Adrian Hunter
2010-09-22 22:25 ` [PATCH] sdhci: print out controller name for register debug Philip Rakity
2010-09-22 23:08 ` Chris Ball
2010-09-23 8:39 ` Wolfram Sang
2010-09-23 16:12 ` Chris Ball
2010-09-23 17:11 ` Wolfram Sang
2010-09-21 6:48 ` [PATCH] sdhci: allow for eMMC 74 clock generation by controller Wolfram Sang
2010-09-23 15:24 ` Philip Rakity
2010-09-23 15:49 ` Subject: [PATCH] sdhci: Show SD Command when doing debug printks Philip Rakity
2010-10-07 23:58 ` [PATCH] sdhci: allow for eMMC 74 clock generation by controller Chris Ball
[not found] ` <763CD352-8557-46F1-89D6-5596C40C435E@marvell.com>
2010-09-24 4:49 ` [PATCH] sdhci: add quirk for controllers that don't support write only detect Wolfram Sang
2010-09-24 9:34 ` Philip Rakity
2010-03-16 20:25 ` Bug in mmc.c == stops eMMC toshiba from working - sector check not good (REPOST) (PATCH) Philip Rakity
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