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| author | Jon Hunter | 2015-09-22 11:27:53 +0200 |
|---|---|---|
| committer | Ulf Hansson | 2015-10-26 16:00:00 +0100 |
| commit | a5f5774c55a2e3ed75f4d6c5556b7bfcb726e6f0 (patch) | |
| tree | 59d6825b63a06eb28f83cce482df405f5228e3ac /kernel | |
| parent | mmc: sdhci-pltfm: enable interrupt mode to detect card for ls1021a (diff) | |
| download | kernel-qcow2-linux-a5f5774c55a2e3ed75f4d6c5556b7bfcb726e6f0.tar.gz kernel-qcow2-linux-a5f5774c55a2e3ed75f4d6c5556b7bfcb726e6f0.tar.xz kernel-qcow2-linux-a5f5774c55a2e3ed75f4d6c5556b7bfcb726e6f0.zip | |
mmc: block: Add new ioctl to send multi commands
Certain eMMC devices allow vendor specific device information to be read
via a sequence of vendor commands. These vendor commands must be issued
in sequence and an atomic fashion. One way to support this would be to
add an ioctl function for sending a sequence of commands to the device
atomically as proposed here. These multi commands are simple array of
the existing mmc_ioc_cmd structure.
The structure passed via the ioctl uses a __u64 type to specify the number
of commands (so that the structure is aligned on a 64-bit boundary) and a
zero length array as a header for list of commands to be issued. The
maximum number of commands that can be sent is determined by
MMC_IOC_MAX_CMDS (which defaults to 255 and should be more than
sufficient).
This based upon work by Seshagiri Holi <sholi@nvidia.com>.
Signed-off-by: Seshagiri Holi <sholi@nvidia.com>
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'kernel')
0 files changed, 0 insertions, 0 deletions