mmc: mmci: stm32: fix max busy timeout calculation

The way that the timeout is currently calculated could lead to a u64
timeout value in mmci_start_command(). This value is then cast in a u32
register that leads to mmc erase failed issue with some SD cards.

Fixes: 8266c58 ("mmc: mmci: add hardware busy timeout feature")
Signed-off-by: Yann Gautier <[email protected]>
Signed-off-by: Christophe Kerello <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Ulf Hansson <[email protected]>

Author: Christophe Kerello

drivers/mmc/host/mmci.c

@@ -1735,7 +1735,8 @@ static void mmci_set_max_busy_timeout(struct mmc_host *mmc)
 		return;
 
 	if (host->variant->busy_timeout && mmc->actual_clock)
-		max_busy_timeout = ~0UL / (mmc->actual_clock / MSEC_PER_SEC);
+		max_busy_timeout = U32_MAX / DIV_ROUND_UP(mmc->actual_clock,
+							  MSEC_PER_SEC);
 
 	mmc->max_busy_timeout = max_busy_timeout;
 }