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

Message ID 20250407152759.25160-6-ulf.hansson@linaro.org
State New
Headers show
Series mmc: core: Add support for graceful host removal for eMMC/SD | expand

Commit Message

Ulf Hansson April 7, 2025, 3:27 p.m. UTC 
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>
---

Changes in v2:
	- None.

---
 drivers/mmc/core/sd.c | 25 +++++++++++++++----------
 1 file changed, 15 insertions(+), 10 deletions(-)
diff mbox series

Patch

diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
index 8eba697d3d86..cb4254a43f85 100644
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -1596,15 +1596,6 @@  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.
  */
@@ -1630,7 +1621,8 @@  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);
@@ -1730,6 +1722,19 @@  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
  */