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From: Robert Jarzmik <robert.jarzmik@free.fr>
To: barebox@lists.infradead.org
Subject: [PATCH 6/6] mci: pxamci poweron ramp delay
Date: Mon, 16 Apr 2012 21:47:18 +0200	[thread overview]
Message-ID: <1334605638-23095-7-git-send-email-robert.jarzmik@free.fr> (raw)
In-Reply-To: <1334605638-23095-1-git-send-email-robert.jarzmik@free.fr>

As per MMC spec, once power has been applied to an SD card, the card
can take as much as 250ms to complete its power-up cycle, and become
responsive to CMD0.

When this delay was not in place, activating the SD card in the env
init failed sometimes. With it, no more failure are observed.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
---
 drivers/mci/pxamci.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/mci/pxamci.c b/drivers/mci/pxamci.c
index 9665196..027fa7b 100644
--- a/drivers/mci/pxamci.c
+++ b/drivers/mci/pxamci.c
@@ -42,6 +42,7 @@ static int pxamci_set_power(struct pxamci_host *host, int on)
 			       !!on ^ host->pdata->gpio_power_invert);
 	else if (host->pdata && host->pdata->setpower)
 		host->pdata->setpower(&host->mci, on);
+	mdelay(250);
 	return 0;
 }
 
-- 
1.7.5.4


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  parent reply	other threads:[~2012-04-16 19:48 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-04-16 19:47 [PATCH 0/6] mci: pxamci fixes Robert Jarzmik
2012-04-16 19:47 ` [PATCH 1/6] mci: pxamci define timeouts Robert Jarzmik
2012-04-16 19:47 ` [PATCH 2/6] mci: pxamci change clocks handling Robert Jarzmik
2012-04-16 19:47 ` [PATCH 3/6] mci: pxamci fix response type Robert Jarzmik
2012-04-16 19:47 ` [PATCH 4/6] mci: pxamci fix CMD12 handling Robert Jarzmik
2012-04-16 19:47 ` [PATCH 5/6] mci: pxamci fix R1b responses Robert Jarzmik
2012-04-16 19:47 ` Robert Jarzmik [this message]
2012-04-17 20:04 ` [PATCH 0/6] mci: pxamci fixes Sascha Hauer

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