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

   1 From 674d82a3db9b47a7772ac732a560979ea22d5c3d Mon Sep 17 00:00:00 2001
   2 From: popcornmix <popcornmix@gmail.com>
   3 Date: Wed, 3 Oct 2012 21:31:48 +0100
   4 Subject: [PATCH 037/196] Allow the number of cycles delay between sdcard
   5  peripheral writes to be specified on command line with
   6  sdhci-bcm2708.cycle_delay
   7
   8 ---
   9  drivers/mmc/host/sdhci-bcm2708.c | 5 ++++-
  10  1 file changed, 4 insertions(+), 1 deletion(-)
  11
  12 diff --git a/drivers/mmc/host/sdhci-bcm2708.c b/drivers/mmc/host/sdhci-bcm2708.c
  13 index 7ce2829..ffd7310 100644
  14 --- a/drivers/mmc/host/sdhci-bcm2708.c
  15 +++ b/drivers/mmc/host/sdhci-bcm2708.c
  16 @@ -77,6 +77,8 @@
  17  #define REG_EXRDFIFO_EN     0x80
  18  #define REG_EXRDFIFO_CFG    0x84
  19
  20 +int cycle_delay=2;
  21 +
  22  /*****************************************************************************\
  23   *                                                                          *
  24   * Debug                                                                    *
  25 @@ -249,7 +251,7 @@ static void sdhci_bcm2708_raw_writel(struct sdhci_host *host, u32 val, int reg)
  26                 /* host->clock is the clock freq in Hz */
  27                 static hptime_t last_write_hpt;
  28                 hptime_t now = hptime();
  29 -               ns_2clk = 2000000000/host->clock;
  30 +               ns_2clk = cycle_delay*1000000/(host->clock/1000);
  31
  32                 if (now == last_write_hpt || now == last_write_hpt+1) {
  33                          /* we can't guarantee any significant time has
  34 @@ -1388,6 +1390,7 @@ module_param(emmc_clock_freq, int, 0444);
  35  module_param(sync_after_dma, bool, 0444);
  36  module_param(missing_status, bool, 0444);
  37  module_param(enable_llm, bool, 0444);
  38 +module_param(cycle_delay, int, 0444);
  39
  40  MODULE_DESCRIPTION("Secure Digital Host Controller Interface platform driver");
  41  MODULE_AUTHOR("Broadcom <info@broadcom.com>");
  42 --
  43 1.9.1
  44