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authorLinus Torvalds <torvalds@linux-foundation.org>2012-01-13 20:41:15 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-01-13 20:41:15 -0800
commit4b8be38cf782f8ebebc089083fa0572ade79d7ca (patch)
tree2f88a0a5c1c0be9121c31b5a2775ae2f979cfa66 /Documentation
parent5df1b274cd2f0304339c7f5586fa16cce0fdfce2 (diff)
parent0db13fc2abbb0b1a8d8efee20dfbd7f3c5d54022 (diff)
Merge tag 'mmc-merge-for-3.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc
MMC highlights for 3.3: Core: * Support for the HS200 high-speed eMMC mode. * Support SDIO 3.0 Ultra High Speed cards. * Kill pending block requests immediately if card is removed. * Enable the eMMC feature for locking boot partitions read-only until next power on, exposed via sysfs. Drivers: * Runtime PM support for Intel Medfield SDIO. * Suspend/resume support for sdhci-spear. * sh-mmcif now processes requests asynchronously. * tag 'mmc-merge-for-3.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc: (58 commits) mmc: fix a deadlock between system suspend and MMC block IO mmc: sdhci: restore the enabled dma when do reset all mmc: dw_mmc: miscaculated the fifo-depth with wrong bit operation mmc: host: Adds support for eMMC 4.5 HS200 mode mmc: core: HS200 mode support for eMMC 4.5 mmc: dw_mmc: fixed wrong bit operation for SDMMC_GET_FCNT() mmc: core: Separate the timeout value for cache-ctrl mmc: sdhci-spear: Fix compilation error mmc: sdhci: Deal with failure case in sdhci_suspend_host mmc: dw_mmc: Clear the DDR mode for non-DDR mmc: sd: Fix SDR12 timing regression mmc: sdhci: Fix tuning timer incorrect setting when suspending host mmc: core: Add option to prevent eMMC sleep command mmc: omap_hsmmc: use threaded irq handler for card-detect. mmc: sdhci-pci: enable runtime PM for Medfield SDIO mmc: sdhci: Always pass clock request value zero to set_clock host op mmc: sdhci-pci: remove SDHCI_QUIRK2_OWN_CARD_DETECTION mmc: sdhci-pci: get gpio numbers from platform data mmc: sdhci-pci: add platform data mmc: sdhci: prevent card detection activity for non-removable cards ...
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/mmc/mmc-dev-attrs.txt10
-rw-r--r--Documentation/mmc/mmc-dev-parts.txt13
2 files changed, 23 insertions, 0 deletions
diff --git a/Documentation/mmc/mmc-dev-attrs.txt b/Documentation/mmc/mmc-dev-attrs.txt
index 8898a95b41e..22ae8441489 100644
--- a/Documentation/mmc/mmc-dev-attrs.txt
+++ b/Documentation/mmc/mmc-dev-attrs.txt
@@ -64,3 +64,13 @@ Note on Erase Size and Preferred Erase Size:
size specified by the card.
"preferred_erase_size" is in bytes.
+
+SD/MMC/SDIO Clock Gating Attribute
+==================================
+
+Read and write access is provided to following attribute.
+This attribute appears only if CONFIG_MMC_CLKGATE is enabled.
+
+ clkgate_delay Tune the clock gating delay with desired value in milliseconds.
+
+echo <desired delay> > /sys/class/mmc_host/mmcX/clkgate_delay
diff --git a/Documentation/mmc/mmc-dev-parts.txt b/Documentation/mmc/mmc-dev-parts.txt
index 2db28b8e662..f08d078d43c 100644
--- a/Documentation/mmc/mmc-dev-parts.txt
+++ b/Documentation/mmc/mmc-dev-parts.txt
@@ -25,3 +25,16 @@ echo 0 > /sys/block/mmcblkXbootY/force_ro
To re-enable read-only access:
echo 1 > /sys/block/mmcblkXbootY/force_ro
+
+The boot partitions can also be locked read only until the next power on,
+with:
+
+echo 1 > /sys/block/mmcblkXbootY/ro_lock_until_next_power_on
+
+This is a feature of the card and not of the kernel. If the card does
+not support boot partition locking, the file will not exist. If the
+feature has been disabled on the card, the file will be read-only.
+
+The boot partitions can also be locked permanently, but this feature is
+not accessible through sysfs in order to avoid accidental or malicious
+bricking.