Increase SDMMC_BUSYD0END_TIMEOUT_US from 1s to 2s to avoid timeout error during blocks erase on some sdcard
Issue seen on Kingston 16GB : Device: STM32 SDMMC2 Manufacturer ID: 27 OEM: 5048 Name: SD16G Bus Speed: 50000000 Mode: SD High Speed (50MHz) card capabilities: widths [4, 1] modes [SD Legacy, SD High Speed (50MHz)] host capabilities: widths [4, 1] modes [MMC legacy, SD Legacy, MMC High Speed (26MHz), SD High Speed (50MHz), MMC High Speed (52MHz)] Rd Block Len: 512 SD version 3.0 High Capacity: Yes Capacity: 14.5 GiB Bus Width: 4-bit Erase Group Size: 512 Bytes
Issue reproduced with following command:
STM32MP> mmc erase 0 100000
MMC erase: dev # 0, block # 0, count 1048576 ... mmc erase failed 16384 blocks erased: ERROR
By by setting SDMMC_BUSYD0END_TIMEOUT_US at 2 seconds and by adding time measurement in stm32_sdmmc2_end_cmd() as shown below:
+start = get_timer(0); /* Polling status register */ ret = readl_poll_timeout(priv->base + SDMMC_STA, status, status & mask, SDMMC_BUSYD0END_TIMEOUT_US);
+printf("time = %ld ms\n", get_timer(start));
We get the following trace:
STM32MP> mmc erase 0 100000
MMC erase: dev # 0, block # 0, count 1048576 ... time = 17 ms time = 1 ms time = 1025 ms time = 54 ms time = 56 ms time = 1021 ms time = 57 ms time = 56 ms time = 1020 ms time = 53 ms time = 57 ms time = 1021 ms time = 53 ms time = 57 ms time = 1313 ms time = 54 ms time = 56 ms time = 1026 ms time = 54 ms time = 56 ms time = 1036 ms time = 54 ms time = 56 ms time = 1028 ms time = 53 ms time = 56 ms time = 1027 ms time = 54 ms time = 56 ms time = 1024 ms time = 54 ms time = 56 ms time = 1020 ms time = 54 ms time = 57 ms time = 1023 ms time = 54 ms time = 56 ms time = 1033 ms time = 53 ms time = 57 ms .... time = 53 ms time = 57 ms time = 1021 ms time = 56 ms time = 56 ms time = 1026 ms time = 54 ms time = 56 ms 1048576 blocks erased: OK
We see that 1 second timeout is not enough, we also see one measurement up to 1313 ms. Set the timeout to 2 second to keep a security margin.
Signed-off-by: Patrice Chotard patrice.chotard@st.com ---
drivers/mmc/stm32_sdmmc2.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/mmc/stm32_sdmmc2.c b/drivers/mmc/stm32_sdmmc2.c index 867ed569eb..0ade1b160e 100644 --- a/drivers/mmc/stm32_sdmmc2.c +++ b/drivers/mmc/stm32_sdmmc2.c @@ -190,7 +190,7 @@ struct stm32_sdmmc2_ctx { #define SDMMC_IDMACTRL_IDMAEN BIT(0)
#define SDMMC_CMD_TIMEOUT 0xFFFFFFFF -#define SDMMC_BUSYD0END_TIMEOUT_US 1000000 +#define SDMMC_BUSYD0END_TIMEOUT_US 2000000
static void stm32_sdmmc2_start_data(struct stm32_sdmmc2_priv *priv, struct mmc_data *data,