linux-kernel - [PATCH] mmc, AT91: fix init fequency problem

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Message-ID: <4D8B0A8B.6030002@aksignal.cz>
Date:	Thu, 24 Mar 2011 10:10:35 +0100
From:	Prchal Jiří <jiri.prchal@...ignal.cz>
To:	linux-mmc@...r.kernel.org, nicolas.ferre@...el.com,
	linux-arm-kernel@...ts.infradead.org
CC:	linux-kernel@...r.kernel.org
Subject: [PATCH] mmc, AT91: fix init fequency problem

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@...ignal.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;
--
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