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[v2,0/5] mmc: core: Add support for graceful host removal for eMMC/SD

Message ID 20250407152759.25160-1-ulf.hansson@linaro.org (mailing list archive)
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Series mmc: core: Add support for graceful host removal for eMMC/SD | expand

Message

Ulf Hansson April 7, 2025, 3:27 p.m. UTC 
Changes in v2:
	- Added reviewed/tested-by tags.
	- Updated patch 2.

As pointed out by Wolfram Sang and already discussed at LKML [1] - an mmc host
driver may allow to unbind from its corresponding host device. If there is and
eMMC/SD card attached to the host, the mmc core will just try to cut the power
for it, without trying to make a graceful power-off, thus potentially we could
damage the card.

This series intends to fix this problem for eMMC/SD cards.

Please help to test and review!

Kind regards
Ulf Hansson

[1]
https://lore.kernel.org/all/20241007093447.33084-2-wsa+renesas@sang-engineering.com/

Ulf Hansson (5):
  mmc: core: Convert mmc_can_poweroff_notify() into a bool
  mmc: core: Further avoid re-storing power to the eMMC before a
    shutdown
  mmc: core: Convert into an enum for the poweroff-type for eMMC
  mmc: core: Add support for graceful host removal for eMMC
  mmc: core: Add support for graceful host removal for SD

 drivers/mmc/core/mmc.c | 71 +++++++++++++++++++++++++++++-------------
 drivers/mmc/core/sd.c  | 25 +++++++++------
 2 files changed, 64 insertions(+), 32 deletions(-)