target/linux/brcm2708/patches-4.1/0130-bcm2835-sdhost-Ignore-CRC7-for-MMC-CMD1.patch

   1 From 0bb775b407dab3bab972663ef47dde38b0d34c24 Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.org>
   3 Date: Mon, 20 Jul 2015 17:32:18 +0100
   4 Subject: [PATCH 130/171] bcm2835-sdhost: Ignore CRC7 for MMC CMD1
   5
   6 It seems that the sdhost interface returns CRC7 errors for CMD1,
   7 which is the MMC-specific SEND_OP_COND. Returning these errors to
   8 the MMC layer causes a downward spiral, but ignoring them seems
   9 to be harmless.
  10 ---
  11  drivers/mmc/host/bcm2835-sdhost.c | 39 +++++++++++++++++++++++----------------
  12  1 file changed, 23 insertions(+), 16 deletions(-)
  13
  14 --- a/drivers/mmc/host/bcm2835-sdhost.c
  15 +++ b/drivers/mmc/host/bcm2835-sdhost.c
  16 @@ -959,25 +959,32 @@ static void bcm2835_sdhost_finish_comman
  17                                 mmc_hostname(host->mmc), sdcmd, sdhsts,
  18                                 bcm2835_sdhost_read(host, SDEDM));
  19
  20 -               if (sdhsts & SDHSTS_CMD_TIME_OUT) {
  21 -                       switch (host->cmd->opcode) {
  22 -                       case 5: case 52: case 53:
  23 -                               /* Don't warn about SDIO commands */
  24 -                               break;
  25 -                       default:
  26 -                               pr_err("%s: command timeout\n",
  27 +               if ((sdhsts & SDHSTS_CRC7_ERROR) &&
  28 +                   (host->cmd->opcode == 1)) {
  29 +                       if (host->debug)
  30 +                               pr_info("%s: ignoring CRC7 error for CMD1\n",
  31 +                                       mmc_hostname(host->mmc));
  32 +               } else {
  33 +                       if (sdhsts & SDHSTS_CMD_TIME_OUT) {
  34 +                               switch (host->cmd->opcode) {
  35 +                               case 5: case 52: case 53:
  36 +                                       /* Don't warn about SDIO commands */
  37 +                                       break;
  38 +                               default:
  39 +                                       pr_err("%s: command timeout\n",
  40 +                                              mmc_hostname(host->mmc));
  41 +                                       break;
  42 +                               }
  43 +                               host->cmd->error = -ETIMEDOUT;
  44 +                       } else {
  45 +                               pr_err("%s: unexpected command error\n",
  46                                        mmc_hostname(host->mmc));
  47 -                               break;
  48 +                               bcm2835_sdhost_dumpregs(host);
  49 +                               host->cmd->error = -EIO;
  50                         }
  51 -                       host->cmd->error = -ETIMEDOUT;
  52 -               } else {
  53 -                       pr_err("%s: unexpected command error\n",
  54 -                              mmc_hostname(host->mmc));
  55 -                       bcm2835_sdhost_dumpregs(host);
  56 -                       host->cmd->error = -EIO;
  57 +                       tasklet_schedule(&host->finish_tasklet);
  58 +                       return;
  59                 }
  60 -               tasklet_schedule(&host->finish_tasklet);
  61 -               return;
  62         }
  63
  64         if (host->cmd->flags & MMC_RSP_PRESENT) {