u-boot-iot2050: Add a temporary workaround for the eMMC issue

After approximately 2 months of operation, the device may fail to detect
the eMMC when rebooting. This commit provides a temporary workaround to
bypass the eMMC issue.

TODO: Implement a permanent solution for eMMC detection issues.

Related to #440.

Signed-off-by: Li Hua Qian <huaqian.li@siemens.com>

recipes-bsp/u-boot/files/0013-driver-iot2050-Add-a-temporary-workaround-for-the-eMMC.patch

@@ -0,0 +1,40 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Li Hua Qian <huaqian.li@siemens.com>
+Date: Mon, 4 Nov 2024 10:46:14 +0800
+Subject: [PATCH] driver: iot2050: Add a temporary workaround for the eMMC
+ issue
+
+After approximately 2 months of operation, the device may fail to detect
+the eMMC when rebooting. This commit provides a temporary workaround to
+bypass the eMMC issue.
+
+TODO: Implement a permanent solution for eMMC detection issues.
+
+Signed-off-by: Li Hua Qian <huaqian.li@siemens.com>
+---
+ drivers/mmc/mmc.c | 12 ++++++++++--
+ 1 file changed, 10 insertions(+), 2 deletions(-)
+
+diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
+index 31cfda288587..dff0ff89a801 100644
+--- a/drivers/mmc/mmc.c
++++ b/drivers/mmc/mmc.c
+@@ -729,8 +729,16 @@ static int mmc_send_op_cond(struct mmc *mmc)
+ 		if (mmc->ocr & OCR_BUSY)
+ 			break;
+
+-		if (get_timer(start) > timeout)
+-			return -ETIMEDOUT;
++		/*
++		 * TODO: Implement a permanent solution for the eMMC detection issues.
++		 * After approximately 2 months of operation, the device may fail to
++		 * detect the eMMC when rebooting. Here provides a temporary workaround
++		 * to bypass the issue.
++		 */
++		if (get_timer(start) > timeout) {
++			printf("mmc: eMMC is busy, continue booting\n");
++			break; //return -ETIMEDOUT;
++		}
+ 		udelay(100);
+ 	}
+ 	mmc->op_cond_pending = 1;

recipes-bsp/u-boot/u-boot-iot2050_2023.10.bb

@@ -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-driver-iot2050-Add-a-temporary-workaround-for-the-eMMC.patch \
     "
 
 SRC_URI[sha256sum] = "e00e6c6f014e046101739d08d06f328811cebcf5ae101348f409cbbd55ce6900"