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u-boot-iot2050: Reset the eMMC when it isn't reachable
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After approximately 2 months of operation, the device may fail to detect
the eMMC when rebooting. This commit provides a temporary workaround to
reset the eMMC if detection issues occur.

TODO: Implement a permanent solution for eMMC detection issues.

Related to #440.

Signed-off-by: Li Hua Qian <[email protected]>
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huaqianli committed Oct 22, 2024
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129 changes: 129 additions & 0 deletions recipes-bsp/u-boot/files/0013-board-iot2050-Reset-the-eMMC-when-it-isn-t-reachable.patch
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@@ -0,0 +1,129 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Li Hua Qian <[email protected]>
Date: Wed, 16 Oct 2024 17:03:10 +0800
Subject: [PATCH] board: iot2050: Reset the eMMC when it isn't reachable

After approximately 2 months of operation, the device may fail to detect
the eMMC when rebooting. This commit provides a temporary workaround to
reset the eMMC if detection issues occur.

TODO: Implement a permanent solution for eMMC detection issues.

Signed-off-by: Li Hua Qian <[email protected]>
---
board/siemens/iot2050/board.c | 60 +++++++++++++++++++++++++++++++
board/siemens/iot2050/iot2050.env | 9 +++++
configs/iot2050_defconfig | 3 +-
3 files changed, 71 insertions(+), 1 deletion(-)

diff --git a/board/siemens/iot2050/board.c b/board/siemens/iot2050/board.c
index 8497212ab890..55e275fe8f26 100644
--- a/board/siemens/iot2050/board.c
+++ b/board/siemens/iot2050/board.c
@@ -464,8 +464,68 @@ static bool user_button_pressed(void)

#define SERDES0_LANE_SELECT 0x00104080

+static int reset_emmc(void)
+{
+ const char *gpio_name = "gpio@601000_14";
+ struct gpio_desc gpio;
+ int ret;
+
+ ret = dm_gpio_lookup_name(gpio_name, &gpio);
+ if (ret < 0) {
+ pr_err("dm_gpio_lookup_name failed for %s: %d\n", gpio_name, ret);
+ return -1;
+ }
+
+ ret = dm_gpio_request(&gpio, "RESET_EMMC");
+ if (ret < 0) {
+ pr_err("dm_gpio_request failed for %s: %d\n", gpio_name, ret);
+ return -1;
+ }
+
+ ret = dm_gpio_set_dir_flags(&gpio, GPIOD_IS_OUT);
+ if (ret < 0) {
+ pr_err("dm_gpio_set_dir_flags failed for %s: %d\n", gpio_name, ret);
+ return -1;
+ }
+
+ dm_gpio_set_value(&gpio, 0);
+ mdelay(4 * 100);
+ dm_gpio_set_value(&gpio, 1);
+
+ return 0;
+}
+
int board_late_init(void)
{
+ /*
+ * TODO: Implement a permanent solution for eMMC detection issues.
+ * After approximately 2 months of operation, the device may fail to
+ * detect the eMMC when rebooting. This following code snippet pulls the
+ * reset pin of eMMC, providing a temporary workaround to reset the eMMC
+ * if detection issues occur.
+ */
+ struct mmc *mmc;
+ int mmc_available = 0;
+
+ if (board_is_advanced()) {
+ for (int i = 0; i < 2; i++) {
+ mmc = find_mmc_device(i);
+ if (mmc && !mmc_init(mmc)) {
+ mmc_available = 1;
+ printf("%s-[%d]: mmc %d is availbe!\n", __func__, __LINE__, i);
+ break;
+ }
+ }
+
+ if (!mmc_available) {
+ printf("%s-[%d]: eMMC wasn't found, reset eMMC ...\n",
+ __func__, __LINE__);
+ if(reset_emmc())
+ pr_err("%s [%d]: Failed to reset eMMC ...\n",
+ __func__, __LINE__);
+ }
+ }
+
/* change CTRL_MMR register to let serdes0 not output USB3.0 signals. */
writel(0x3, SERDES0_LANE_SELECT);

diff --git a/board/siemens/iot2050/iot2050.env b/board/siemens/iot2050/iot2050.env
index caa9f80e3fca..c8b855852da4 100644
--- a/board/siemens/iot2050/iot2050.env
+++ b/board/siemens/iot2050/iot2050.env
@@ -17,3 +17,12 @@ start_watchdog=
wdt start ${watchdog_timeout_ms};
echo Watchdog started, timeout ${watchdog_timeout_ms} ms;
fi
+
+/*
+ * TODO: Implement a permanent solution for eMMC detection issues.
+ * After approximately 2 months of operation, the device may fail to detect the
+ * eMMC when rebooting. This command enables the eMMC ECSD reset function on
+ * the board, providing a temporary workaround to reset the eMMC if detection
+ * issues occur.
+ */
+mmc_reset_enable=mmc rst-function 1 1 || true
diff --git a/configs/iot2050_defconfig b/configs/iot2050_defconfig
index 4fc3bcb56b8f..d3ba26705d33 100644
--- a/configs/iot2050_defconfig
+++ b/configs/iot2050_defconfig
@@ -39,7 +39,7 @@ CONFIG_AUTOBOOT_KEYED=y
CONFIG_AUTOBOOT_FLUSH_STDIN=y
CONFIG_AUTOBOOT_PROMPT="Hit SPACE to stop autoboot in %d seconds...\n"
CONFIG_AUTOBOOT_STOP_STR=" "
-CONFIG_BOOTCOMMAND="run start_watchdog; run distro_bootcmd"
+CONFIG_BOOTCOMMAND="run start_watchdog; run mmc_reset_enable; run distro_bootcmd"
# CONFIG_DISPLAY_CPUINFO is not set
CONFIG_SPL_MAX_SIZE=0x58000
CONFIG_SPL_HAS_BSS_LINKER_SECTION=y
@@ -68,6 +68,7 @@ CONFIG_CMD_DFU=y
CONFIG_CMD_GPT=y
CONFIG_CMD_I2C=y
CONFIG_CMD_MMC=y
+CONFIG_SUPPORT_EMMC_BOOT=y
CONFIG_CMD_PCI=y
CONFIG_CMD_REMOTEPROC=y
CONFIG_CMD_USB=y
1 change: 1 addition & 0 deletions recipes-bsp/u-boot/u-boot-iot2050_2023.10.bb
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,7 @@ SRC_URI += " \
file://0010-dts-iot2050-Support-new-IOT2050-SM-variant.patch \
file://0011-arm-dts-iot2050-Disable-lock-step-mode-for-all-iot20.patch \
file://0012-qspi-iot2050-Add-temporary-workaround-for-the-QSPI-i.patch \
file://0013-board-iot2050-Reset-the-eMMC-when-it-isn-t-reachable.patch \
"

SRC_URI[sha256sum] = "e00e6c6f014e046101739d08d06f328811cebcf5ae101348f409cbbd55ce6900"
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