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mmc: stm32_sdmmc2: avoid infinite while loop

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Avoid unlimited while loop by adding a timeout. The timeout is
calculated based on a minimal throughput of 256 KB/s.
The timeout is set at least to 2 seconds.

Signed-off-by: Christophe Kerello <christophe.kerello@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
This commit is contained in:
Christophe Kerello
2025-08-12 15:55:26 +02:00
committed by Patrice Chotard
parent 4c28c4d9a3
commit 1067d2060f
1 changed files with 15 additions and 1 deletions
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16
drivers/mmc/stm32_sdmmc2.c
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@@ -385,15 +385,29 @@ static int stm32_sdmmc2_end_data(struct udevice *dev,
u32 mask = SDMMC_STA_DCRCFAIL | SDMMC_STA_DTIMEOUT |
SDMMC_STA_IDMATE | SDMMC_STA_DATAEND;
u32 status;
unsigned long timeout_msecs = ctx->data_length >> 8;
unsigned long start_timeout;
/* At least, a timeout of 2 seconds is set */
if (timeout_msecs < 2000)
timeout_msecs = 2000;
if (data->flags & MMC_DATA_READ)
mask |= SDMMC_STA_RXOVERR;
else
mask |= SDMMC_STA_TXUNDERR;
start_timeout = get_timer(0);
status = readl(plat->base + SDMMC_STA);
while (!(status & mask))
while (!(status & mask)) {
if (get_timer(start_timeout) > timeout_msecs) {
ctx->dpsm_abort = true;
return -ETIMEDOUT;
}
schedule();
status = readl(plat->base + SDMMC_STA);
}
/*
* Need invalidate the dcache again to avoid any