target/linux/brcm2708/patches-4.4/0497-bcm2835-sdhost-Don-t-exit-cmd-wait-loop-on-error.patch

   1 From 0ca1a9040cff3ace3d7fce5cdd83f1cbaa8da50c Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.org>
   3 Date: Fri, 2 Sep 2016 17:21:42 +0100
   4 Subject: [PATCH] bcm2835-sdhost: Don't exit cmd wait loop on error
   5
   6 The FAIL flag can be set in the CMD register before command processing
   7 is complete, leading to spurious "failed to complete" errors. This has
   8 the effect of promoting harmless CRC7 errors during CMD1 processing
   9 into errors that can delay and even prevent booting.
  10
  11 Also:
  12 1) Convert the last KERN_ERROR message in the register dumping to
  13    KERN_INFO.
  14 2) Remove an unnecessary reset call from  bcm2835_sdhost_add_host.
  15
  16 See: https://github.com/raspberrypi/linux/pull/1492
  17
  18 Signed-off-by: Phil Elwell <phil@raspberrypi.org>
  19 ---
  20  drivers/mmc/host/bcm2835-sdhost.c | 10 +++-------
  21  1 file changed, 3 insertions(+), 7 deletions(-)
  22
  23 --- a/drivers/mmc/host/bcm2835-sdhost.c
  24 +++ b/drivers/mmc/host/bcm2835-sdhost.c
  25 @@ -373,7 +373,7 @@ static void bcm2835_sdhost_dumpregs(stru
  26         pr_info("%s: SDRSP2 0x%08x\n",
  27                 mmc_hostname(host->mmc),
  28                 bcm2835_sdhost_read(host, SDRSP2));
  29 -       pr_err("%s: SDRSP3 0x%08x\n",
  30 +       pr_info("%s: SDRSP3 0x%08x\n",
  31                 mmc_hostname(host->mmc),
  32                 bcm2835_sdhost_read(host, SDRSP3));
  33         pr_info("%s: SDHSTS 0x%08x\n",
  34 @@ -1183,9 +1183,8 @@ static void bcm2835_sdhost_finish_comman
  35                 retries = 1; // We've already waited long enough this time
  36         }
  37
  38 -       retries = host->cmd_quick_poll_retries;
  39         for (sdcmd = bcm2835_sdhost_read(host, SDCMD);
  40 -            (sdcmd & SDCMD_NEW_FLAG) && !(sdcmd & SDCMD_FAIL_FLAG) && retries;
  41 +            (sdcmd & SDCMD_NEW_FLAG) && retries;
  42              retries--) {
  43                 cpu_relax();
  44                 sdcmd = bcm2835_sdhost_read(host, SDCMD);
  45 @@ -1208,8 +1207,7 @@ static void bcm2835_sdhost_finish_comman
  46                         usleep_range(1, 10);
  47                         spin_lock_irqsave(&host->lock, *irq_flags);
  48                         sdcmd = bcm2835_sdhost_read(host, SDCMD);
  49 -                       if (!(sdcmd & SDCMD_NEW_FLAG) ||
  50 -                           (sdcmd & SDCMD_FAIL_FLAG))
  51 +                       if (!(sdcmd & SDCMD_NEW_FLAG))
  52                                 break;
  53                 }
  54         }
  55 @@ -1892,8 +1890,6 @@ int bcm2835_sdhost_add_host(struct bcm28
  56
  57         mmc = host->mmc;
  58
  59 -       bcm2835_sdhost_reset_internal(host);
  60 -
  61         mmc->f_max = host->max_clk;
  62         mmc->f_min = host->max_clk / SDCDIV_MAX_CDIV;
  63