1. 14 Feb, 2017 1 commit
    • Anssi Hannula's avatar
      mmc: core: fix multi-bit bus width without high-speed mode · 3d4ef329
      Anssi Hannula authored
      Commit 577fb131 ("mmc: rework selection of bus speed mode")
      refactored bus width selection code to mmc_select_bus_width().
      
      However, it also altered the behavior to not call the selection code in
      non-high-speed modes anymore.
      
      This causes 1-bit mode to always be used when the high-speed mode is not
      enabled, even though 4-bit and 8-bit bus are valid bus widths in the
      backwards-compatibility (legacy) mode as well (see e.g. 5.3.2 Bus Speed
      Modes in JEDEC 84-B50). This results in a significant regression in
      transfer speeds.
      
      Fix the code to allow 4-bit and 8-bit widths even without high-speed
      mode, as before.
      
      Tested with a Zynq-7000 PicoZed 7020 board.
      
      Fixes: 577fb131 ("mmc: rework selection of bus speed mode")
      Signed-off-by: default avatarAnssi Hannula <anssi.hannula@bitwise.fi>
      Cc: <stable@vger.kernel.org>
      Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
      3d4ef329
  2. 12 Feb, 2017 1 commit
  3. 11 Feb, 2017 8 commits
  4. 10 Feb, 2017 25 commits
  5. 09 Feb, 2017 5 commits