Stefan Wahren
2016-08-06 12:55:37 UTC
Based on these discussions: [1], [2] this patch series implements
DDR support for the MXS MMC host driver. This feature has never been
ported from the vendor kernel.
It has been tested on a i.MX28 board with eMMC which is currently
not in mainline (Duckbill 2).
* without DDR support
dd if=/dev/zero of=test bs=8k count=10000
81920000 bytes (82 MB) copied, 14.3321 s, 5.7 MB/s
* with DDR support:
dd if=/dev/zero of=test bs=8k count=10000
81920000 bytes (82 MB) copied, 13.4781 s, 6.1 MB/s
[1] - http://www.spinics.net/lists/linux-mmc/msg32285.html
[2] - http://www.spinics.net/lists/linux-mmc/msg34418.html
Stefan Wahren (3):
DT: bindings: mmc: Add property for 3.3V only support
mmc: core: add new cap for 3.3V only DDR MMCs
mmc: mxs-mmc: Implement DDR support
Documentation/devicetree/bindings/mmc/mmc.txt | 7 +++++--
drivers/mmc/core/host.c | 2 ++
drivers/mmc/core/mmc.c | 6 ++++++
drivers/mmc/host/mxs-mmc.c | 22 ++++++++++++++++++++++
include/linux/mmc/host.h | 1 +
5 files changed, 36 insertions(+), 2 deletions(-)
DDR support for the MXS MMC host driver. This feature has never been
ported from the vendor kernel.
It has been tested on a i.MX28 board with eMMC which is currently
not in mainline (Duckbill 2).
* without DDR support
dd if=/dev/zero of=test bs=8k count=10000
81920000 bytes (82 MB) copied, 14.3321 s, 5.7 MB/s
* with DDR support:
dd if=/dev/zero of=test bs=8k count=10000
81920000 bytes (82 MB) copied, 13.4781 s, 6.1 MB/s
[1] - http://www.spinics.net/lists/linux-mmc/msg32285.html
[2] - http://www.spinics.net/lists/linux-mmc/msg34418.html
Stefan Wahren (3):
DT: bindings: mmc: Add property for 3.3V only support
mmc: core: add new cap for 3.3V only DDR MMCs
mmc: mxs-mmc: Implement DDR support
Documentation/devicetree/bindings/mmc/mmc.txt | 7 +++++--
drivers/mmc/core/host.c | 2 ++
drivers/mmc/core/mmc.c | 6 ++++++
drivers/mmc/host/mxs-mmc.c | 22 ++++++++++++++++++++++
include/linux/mmc/host.h | 1 +
5 files changed, 36 insertions(+), 2 deletions(-)
--
1.7.9.5
1.7.9.5