From: "Prchal Jiří" <jiri.prchal@aksignal.cz>
To: linux-mmc@vger.kernel.org, nicolas.ferre@atmel.com,
linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Subject: [PATCH] mmc, AT91: fix init fequency problem
Date: Thu, 24 Mar 2011 10:10:35 +0100 [thread overview]
Message-ID: <4D8B0A8B.6030002@aksignal.cz> (raw)
In-Reply-To: <1300949648-15078-2-git-send-email-horms@verge.net.au>
Hi,
this patch fixes problem with some SD cards during initialization. Not all SD(HC) card can run at even 375kHz. Sets
minimal frequency to 200kHz.
And in function "at91_mci_set_ios" is limit to maximum division, it's only 8 bit value.
Kernel version: 2.6.38
Signed-off-by: Jiri Prchal <jiri.prchal@aksignal.cz>
---
diff -uprN -X linux-2.6.38-vanilla/Documentation/dontdiff linux-2.6.38-vanilla/drivers/mmc/host/at91_mci.c
/home/prchal/arm/fw-cdu/linux/linux-2.6.38/drivers/mmc/host/at91_mci.c
--- linux-2.6.38-vanilla/drivers/mmc/host/at91_mci.c 2011-03-15 02:20:32.000000000 +0100
+++ /home/prchal/arm/fw-cdu/linux/linux-2.6.38/drivers/mmc/host/at91_mci.c 2011-03-24 09:20:22.869370179 +0100
@@ -724,6 +724,10 @@ static void at91_mci_set_ios(struct mmc_
else
clkdiv = (at91_master_clock / ios->clock) / 2;
+ /* set maximum divider */
+ if (clkdiv > 255)
+ clkdiv = 255;
+
pr_debug("clkdiv = %d. mcck = %ld\n", clkdiv,
at91_master_clock / (2 * (clkdiv + 1)));
}
@@ -944,7 +948,7 @@ static int __init at91_mci_probe(struct
}
mmc->ops = &at91_mci_ops;
- mmc->f_min = 375000;
+ mmc->f_min = 200000; /* not all cards can run at 375kHz */
mmc->f_max = 25000000;
mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
mmc->caps = 0;
next parent reply other threads:[~2011-03-24 9:19 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1300949648-15078-1-git-send-email-horms@verge.net.au>
[not found] ` <1300949648-15078-2-git-send-email-horms@verge.net.au>
2011-03-24 9:10 ` Prchal Jiří [this message]
2011-03-24 10:20 ` [PATCH 1/2] ALSA: ASoc: TLV320AIC3X: ad SPI and clock on GPIO2 or BCLK Prchal Jiří
2011-04-02 8:26 ` [alsa-devel] " Mark Brown
2011-04-04 7:49 ` Prchal Jiří
2011-04-04 8:03 ` Mark Brown
2011-04-04 8:01 ` [PATCH] ALSA: ASoc: new functions snd_soc_7_8_* Prchal Jiří
2011-04-04 8:05 ` Mark Brown
2011-03-24 10:43 ` [PATCH 2/2] ALSA: ASoc: putting together AT91SAM9260 and TLV320AIC3X Prchal Jiří
2011-03-24 20:07 ` Ryan Mallon
2011-04-04 8:57 ` Prchal Jiří
2011-04-04 20:07 ` Ryan Mallon
2011-04-04 9:10 ` [PATCH] ARCH arm: adding new board: CDU Prchal Jiří
2011-04-04 9:16 ` Russell King - ARM Linux
2011-04-04 9:24 ` Russell King - ARM Linux
2011-04-04 20:25 ` Ryan Mallon
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