openwrtv4/target/linux/brcm2708/patches-3.10/0014-sdhci-bcm2708-add-allow_highspeed-parameter.patch

From 06d314090d1c837d5f2c42c9686c8e8fa7db7370 Mon Sep 17 00:00:00 2001
From: Grigori Goronzy <greg@blackbox>
Date: Mon, 11 Jun 2012 18:57:13 +0200
Subject: [PATCH 014/196] sdhci-bcm2708: add allow_highspeed parameter

Add a parameter to disable high-speed mode for the few cards that
still might have problems. High-speed mode is enabled by default.
---
 drivers/mmc/host/sdhci-bcm2708.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/sdhci-bcm2708.c b/drivers/mmc/host/sdhci-bcm2708.c
index 3001836..c64de21 100644
--- a/drivers/mmc/host/sdhci-bcm2708.c
+++ b/drivers/mmc/host/sdhci-bcm2708.c
@@ -129,6 +129,8 @@ static inline unsigned long int since_ns(hptime_t t)
 	return (unsigned long)((hptime() - t) * HPTIME_CLK_NS);
 }
 
+static bool allow_highspeed = 1;
+
 #if 0
 static void hptime_test(void)
 {
@@ -1254,7 +1256,8 @@ static int sdhci_bcm2708_probe(struct platform_device *pdev)
 	    host_priv->dma_chan, host_priv->dma_chan_base,
 	    host_priv->dma_irq);
 
-	host->mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
+    if (allow_highspeed)
+        host->mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
 #endif
 
 	ret = sdhci_add_host(host);
@@ -1357,8 +1360,12 @@ static void __exit sdhci_drv_exit(void)
 module_init(sdhci_drv_init);
 module_exit(sdhci_drv_exit);
 
+module_param(allow_highspeed, bool, 0444);
+
 MODULE_DESCRIPTION("Secure Digital Host Controller Interface platform driver");
 MODULE_AUTHOR("Broadcom <info@broadcom.com>");
 MODULE_LICENSE("GPL v2");
 MODULE_ALIAS("platform:"DRIVER_NAME);
 
+MODULE_PARM_DESC(allow_highspeed, "Allow high speed transfers modes");
+
-- 
1.9.1