openwrtv4/target/linux/brcm2708/patches-3.10/0037-Allow-the-number-of-cycles-delay-between-sdcard-peri.patch

From 674d82a3db9b47a7772ac732a560979ea22d5c3d Mon Sep 17 00:00:00 2001
From: popcornmix <popcornmix@gmail.com>
Date: Wed, 3 Oct 2012 21:31:48 +0100
Subject: [PATCH 037/196] Allow the number of cycles delay between sdcard
 peripheral writes to be specified on command line with
 sdhci-bcm2708.cycle_delay

---
 drivers/mmc/host/sdhci-bcm2708.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/sdhci-bcm2708.c b/drivers/mmc/host/sdhci-bcm2708.c
index 7ce2829..ffd7310 100644
--- a/drivers/mmc/host/sdhci-bcm2708.c
+++ b/drivers/mmc/host/sdhci-bcm2708.c
@@ -77,6 +77,8 @@
 #define REG_EXRDFIFO_EN     0x80
 #define REG_EXRDFIFO_CFG    0x84
 
+int cycle_delay=2;
+
 /*****************************************************************************\
  *									     *
  * Debug								     *
@@ -249,7 +251,7 @@ static void sdhci_bcm2708_raw_writel(struct sdhci_host *host, u32 val, int reg)
 		/* host->clock is the clock freq in Hz */
 		static hptime_t last_write_hpt;
 		hptime_t now = hptime();
-		ns_2clk = 2000000000/host->clock;
+		ns_2clk = cycle_delay*1000000/(host->clock/1000);
 
 		if (now == last_write_hpt || now == last_write_hpt+1) {
 			 /* we can't guarantee any significant time has
@@ -1388,6 +1390,7 @@ module_param(emmc_clock_freq, int, 0444);
 module_param(sync_after_dma, bool, 0444);
 module_param(missing_status, bool, 0444);
 module_param(enable_llm, bool, 0444);
+module_param(cycle_delay, int, 0444);
 
 MODULE_DESCRIPTION("Secure Digital Host Controller Interface platform driver");
 MODULE_AUTHOR("Broadcom <info@broadcom.com>");
-- 
1.9.1