From: Juergen Beisert <jbe@pengutronix.de>
To: barebox@lists.infradead.org
Subject: [PATCH 4/6] MCI/Core: honor transmission limits at the card's side
Date: Fri, 26 Apr 2013 11:31:50 +0200 [thread overview]
Message-ID: <1366968712-17851-5-git-send-email-jbe@pengutronix.de> (raw)
In-Reply-To: <1366968712-17851-1-git-send-email-jbe@pengutronix.de>
The host limits are only one limit we must honor when changing the transmission frequency.
The SD cards have their own limits, so take them also into account.
Signed-off-by: Juergen Beisert <jbe@pengutronix.de>
---
drivers/mci/mci-core.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/mci/mci-core.c b/drivers/mci/mci-core.c
index 9aeaa4d..42e3d4b 100644
--- a/drivers/mci/mci-core.c
+++ b/drivers/mci/mci-core.c
@@ -605,13 +605,17 @@ static void mci_set_clock(struct mci *mci, unsigned clock)
{
struct mci_host *host = mci->host;
- /* check against any given limits */
+ /* check against any given limits at the host's side */
if (clock > host->f_max)
clock = host->f_max;
if (clock < host->f_min)
clock = host->f_min;
+ /* check against the limit at the card's side */
+ if (mci->tran_speed != 0 && clock > mci->tran_speed)
+ clock = mci->tran_speed;
+
host->clock = clock; /* the new target frequency */
mci_set_ios(mci);
}
--
1.8.2.rc2
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next prev parent reply other threads:[~2013-04-26 9:32 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-26 9:31 Some fixes and improvements while working with the Chumby Juergen Beisert
2013-04-26 9:31 ` [PATCH 1/6] MXS/MCI: add forgotten header file Juergen Beisert
2013-04-26 9:31 ` [PATCH 2/6] MXS/MCI: don't touch variables in the host structure Juergen Beisert
2013-04-26 9:31 ` [PATCH 3/6] MCI/Core: increase the transmission frequency while card detection Juergen Beisert
2013-04-26 9:31 ` Juergen Beisert [this message]
2013-04-26 9:31 ` [PATCH 5/6] MCI/MXS: report a better matching error code when the transfer fails Juergen Beisert
2013-04-26 9:31 ` [PATCH 6/6] MCI/Core: move an ugly ifdef to the header file Juergen Beisert
2013-04-26 22:04 ` Sascha Hauer
2013-04-26 22:08 ` Some fixes and improvements while working with the Chumby Sascha Hauer
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