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mmc: core: Add support for graceful host removal for SD

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An mmc host driver may allow to unbind from its corresponding host device.
If an SD card is attached to the host, the mmc core will just try to cut
the power for it, without obeying to the SD spec that potentially may
damage the card.

Let's fix this problem by implementing a graceful power-down of the card at
host removal.

Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Link: https://lore.kernel.org/r/20250407152759.25160-6-ulf.hansson@linaro.org
This commit is contained in:
Ulf Hansson 2025-04-07 17:27:55 +02:00
parent 5b79352290
commit dfc29a10c4
1 changed files with 15 additions and 10 deletions
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25
drivers/mmc/core/sd.c
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@ -1612,15 +1612,6 @@ static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
return err;
}
/*
* Host is being removed. Free up the current card.
*/
static void mmc_sd_remove(struct mmc_host *host)
{
mmc_remove_card(host->card);
host->card = NULL;
}
/*
* Card detection - card is alive.
*/
@ -1646,7 +1637,8 @@ static void mmc_sd_detect(struct mmc_host *host)
mmc_put_card(host->card, NULL);
if (err) {
mmc_sd_remove(host);
mmc_remove_card(host->card);
host->card = NULL;
mmc_claim_host(host);
mmc_detach_bus(host);
@ -1746,6 +1738,19 @@ static int _mmc_sd_suspend(struct mmc_host *host)
return err;
}
/*
* Host is being removed. Free up the current card and do a graceful power-off.
*/
static void mmc_sd_remove(struct mmc_host *host)
{
get_device(&host->card->dev);
mmc_remove_card(host->card);
_mmc_sd_suspend(host);
put_device(&host->card->dev);
host->card = NULL;
}
/*
* Callback for suspend
*/