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

   1 From 06d314090d1c837d5f2c42c9686c8e8fa7db7370 Mon Sep 17 00:00:00 2001
   2 From: Grigori Goronzy <greg@blackbox>
   3 Date: Mon, 11 Jun 2012 18:57:13 +0200
   4 Subject: [PATCH 014/196] sdhci-bcm2708: add allow_highspeed parameter
   5
   6 Add a parameter to disable high-speed mode for the few cards that
   7 still might have problems. High-speed mode is enabled by default.
   8 ---
   9  drivers/mmc/host/sdhci-bcm2708.c | 9 ++++++++-
  10  1 file changed, 8 insertions(+), 1 deletion(-)
  11
  12 diff --git a/drivers/mmc/host/sdhci-bcm2708.c b/drivers/mmc/host/sdhci-bcm2708.c
  13 index 3001836..c64de21 100644
  14 --- a/drivers/mmc/host/sdhci-bcm2708.c
  15 +++ b/drivers/mmc/host/sdhci-bcm2708.c
  16 @@ -129,6 +129,8 @@ static inline unsigned long int since_ns(hptime_t t)
  17         return (unsigned long)((hptime() - t) * HPTIME_CLK_NS);
  18  }
  19
  20 +static bool allow_highspeed = 1;
  21 +
  22  #if 0
  23  static void hptime_test(void)
  24  {
  25 @@ -1254,7 +1256,8 @@ static int sdhci_bcm2708_probe(struct platform_device *pdev)
  26             host_priv->dma_chan, host_priv->dma_chan_base,
  27             host_priv->dma_irq);
  28
  29 -       host->mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
  30 +    if (allow_highspeed)
  31 +        host->mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
  32  #endif
  33
  34         ret = sdhci_add_host(host);
  35 @@ -1357,8 +1360,12 @@ static void __exit sdhci_drv_exit(void)
  36  module_init(sdhci_drv_init);
  37  module_exit(sdhci_drv_exit);
  38
  39 +module_param(allow_highspeed, bool, 0444);
  40 +
  41  MODULE_DESCRIPTION("Secure Digital Host Controller Interface platform driver");
  42  MODULE_AUTHOR("Broadcom <info@broadcom.com>");
  43  MODULE_LICENSE("GPL v2");
  44  MODULE_ALIAS("platform:"DRIVER_NAME);
  45
  46 +MODULE_PARM_DESC(allow_highspeed, "Allow high speed transfers modes");
  47 +
  48 --
  49 1.9.1
  50