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| author |   Lin Gui <lin.gui@mediatek.com> | 2023-12-19 07:05:32 +0800 |
|---|---|---|
| committer |   Ulf Hansson <ulf.hansson@linaro.org> | 2024-01-02 17:54:05 +0100 |
| commit | e4df56ad0bf3506c5189abb9be83f3bea05a4c4f (patch) | |
| tree | a5db3a85f44b29dd773c5c65c3340d50b74b6687 /include/linux/mmc | |
| parent | mmc: mmc_test: Add re-tuning test (diff) | |
| download | wireguard-linux-e4df56ad0bf3506c5189abb9be83f3bea05a4c4f.tar.xz wireguard-linux-e4df56ad0bf3506c5189abb9be83f3bea05a4c4f.zip | |
mmc: core: Add wp_grp_size sysfs node
The eMMC card can be set into write-protected mode to prevent data from
being accidentally modified or deleted. Wp_grp_size (Write Protect Group
Size) refers to an attribute of the eMMC card, used to manage write
protection and is the CSD register [36:32] of the eMMC device. Wp_grp_size
(Write Protect Group Size) indicates how many eMMC blocks are contained in
each write protection group on the eMMC card.
To allow userspace easy access of the CSD register bits, let's add sysfs
node "wp_grp_size".
Signed-off-by: Lin Gui <lin.gui@mediatek.com>
Signed-off-by: Bo Ye <bo.ye@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20231218230532.82427-1-bo.ye@mediatek.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'include/linux/mmc')
| -rw-r--r-- | include/linux/mmc/card.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h index 47eeb122524c..f34407cc2788 100644 --- a/include/linux/mmc/card.h +++ b/include/linux/mmc/card.h @@ -32,6 +32,7 @@ struct mmc_csd { unsigned int r2w_factor; unsigned int max_dtr; unsigned int erase_size; /* In sectors */ + unsigned int wp_grp_size; unsigned int read_blkbits; unsigned int write_blkbits; unsigned int capacity; @@ -303,6 +304,7 @@ struct mmc_card { unsigned int eg_boundary; /* don't cross erase-group boundaries */ unsigned int erase_arg; /* erase / trim / discard */ u8 erased_byte; /* value of erased bytes */ + unsigned int wp_grp_size; /* write group size in sectors */ u32 raw_cid[4]; /* raw card CID */ u32 raw_csd[4]; /* raw card CSD */ |