Fixbug: Fix the bug emmc bug

[Start-xl-wq]

拉取/合并请求描述：(PR description)

Fix the bug where the cmd6 command is sent but the status of the card is not queried, which can cause failure in switching to the high-speed mode in DDR mode.

为什么提交这份PR (why to submit this PR)

Solve the issue of normal code execution in the eMMC DDR mode.

你的解决方案是什么 (what is your solution)

Add command 13 polling in mmc_switch.

当前拉取/合并请求的状态 Intent for your PR

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• 本拉取/合并请求是一个草稿版本 This PR is for a code-review and is intended to get feedback
• 本拉取/合并请求是一个成熟版本 This PR is mature, and ready to be integrated into the repo

代码质量 Code Quality：

我在这个拉取/合并请求中已经考虑了 As part of this pull request, I've considered the following:

• 已经仔细查看过代码改动的对比 Already check the difference between PR and old code
• 代码风格正确，包括缩进空格，命名及其他风格 Style guide is adhered to, including spacing, naming and other styles
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• 所有变更均有原因及合理的，并且不会影响到其他软件组件代码或BSP All modifications are justified and not affect other components or BSP
• 对难懂代码均提供对应的注释 I've commented appropriately where code is tricky
• 代码是高质量的 Code in this PR is of high quality
• 已经使用formatting 等源码格式化工具确保格式符合RT-Thread代码规范 This PR complies with RT-Thread code specification
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[github-actions]

📌 Code Review Assignment

🏷️ Tag: components

Reviewers: Maihuanyi

Changed Files (Click to expand)

• components/drivers/sdio/dev_mmc.c

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📊 Current Review Status (Last Updated: 2026-01-19 15:25 CST)

• ⌛ Maihuanyi Pending Review

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[Start-xl-wq]

For more details, please refer to: https://club.rt-thread.org/ask/question/26ae04a2e1a47f0d.html

[Copilot]

Pull request overview

This PR fixes an eMMC bug where CMD6 (SWITCH command) is sent to modify the EXT_CSD register, but the card status is not subsequently polled to verify the operation completed successfully. This can cause failures when switching to high-speed DDR mode. The fix adds two new helper functions (mmc_send_status and mmc_poll_for_busy) that implement CMD13 status polling with timeout handling, and integrates this polling into the mmc_switch function.

Changes:

• Added mmc_send_status() function to send CMD13 and retrieve card status
• Added mmc_poll_for_busy() function to poll card status until ready or timeout
• Modified mmc_switch() to call mmc_poll_for_busy() after sending CMD6

[Start-xl-wq]

LGTM