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| author | Anssi Hannula <anssi.hannula@bitwise.fi> | 2017-02-13 13:46:41 +0200 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2017-02-14 08:50:10 +0100 |
| commit | 3d4ef329757cfd5e0b23cce97cdeca7e2df89c99 (patch) | |
| tree | 74bf597f6e43a0d85684dd1db535a29d23d4d29d /Documentation/video-output.txt | |
| parent | 7089db84e356562f8ba737c29e472cc42d530dbc (diff) | |
mmc: core: fix multi-bit bus width without high-speed mode
Commit 577fb13199b1 ("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: 577fb13199b1 ("mmc: rework selection of bus speed mode")
Signed-off-by: Anssi Hannula <anssi.hannula@bitwise.fi>
Cc: <stable@vger.kernel.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'Documentation/video-output.txt')
0 files changed, 0 insertions, 0 deletions