target/linux/brcm2708/patches-3.18/0059-mmc-Disable-CMD23-transfers-on-all-cards.patch

   1 From 06c752756a452a0c59447836edce57ef7393be5c Mon Sep 17 00:00:00 2001
   2 From: P33M <P33M@github.com>
   3 Date: Tue, 13 Jan 2015 17:12:18 +0000
   4 Subject: [PATCH 059/114] mmc: Disable CMD23 transfers on all cards
   5
   6 Pending wire-level investigation of these types of transfers
   7 and associated errors on bcm2835-mmc, disable for now. Fallback of
   8 CMD18/CMD25 transfers will be used automatically by the MMC layer.
   9
  10 Reported/Tested-by: Gellert Weisz <gellert@raspberrypi.org>
  11 ---
  12  drivers/mmc/core/quirks.c | 4 ++++
  13  1 file changed, 4 insertions(+)
  14
  15 --- a/drivers/mmc/core/quirks.c
  16 +++ b/drivers/mmc/core/quirks.c
  17 @@ -95,5 +95,9 @@ void mmc_fixup_device(struct mmc_card *c
  18                         f->vendor_fixup(card, f->data);
  19                 }
  20         }
  21 +       /* SDHCI on BCM2708 - bug causes a certain sequence of CMD23 operations to fail.
  22 +        * Disable this flag for all cards (fall-back to CMD25/CMD18 multi-block transfers).
  23 +        */
  24 +       card->quirks |= MMC_QUIRK_BLK_NO_CMD23;
  25  }
  26  EXPORT_SYMBOL(mmc_fixup_device);