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msm8953终端设备SD卡不识别系统把SD做成长供电
阅读量:208 次
发布时间:2019-02-28

本文共 1935 字,大约阅读时间需要 6 分钟。

msm8953

 

SD卡不识别 插卡日志

console:/ # dmesg

console:/ # cat /proc/kmsg
[  122.791973] mmc1: sdhci_msm_execute_tuning: no tuning point found
[  122.792069] mmc1: tuning execution failed: -5
<3>[  122.791973] mmc1: sdhci_msm_execute_tuning: no tuning point found
<3>[  122.792069] mmc1: tuning execution failed: -5
[  123.029692] mmc1: sdhci_msm_execute_tuning: no tuning point found
[  123.029749] mmc1: tuning execution failed: -5
<3>[  123.029692] mmc1: sdhci_msm_execute_tuning: no tuning point found
<3>[  123.029749] mmc1: tuning execution failed: -5
[  123.554364] mmc1: sdhci_msm_execute_tuning: no tuning point found
[  123.554464] mmc1: tuning execution failed: -5
<3>[  123.554364] mmc1: sdhci_msm_execute_tuning: no tuning point found
<3>[  123.554464] mmc1: tuning execution failed: -5
[  123.820137] mmc1: sdhci_msm_execute_tuning: no tuning point found
[  123.820232] mmc1: tuning execution failed: -5
<3>[  123.820137] mmc1: sdhci_msm_execute_tuning: no tuning point found
<3>[  123.820232] mmc1: tuning execution failed: -5
[  124.057573] mmc1: sdhci_msm_execute_tuning: no tuning point found
[  124.057622] mmc1: tuning execution failed: -5
[  124.125102] mmc1: mmc_sd_init_card() failure (err = -5)
[  124.125183] mmc1: error -5 whilst initialising SD card
<3>[  124.125183] mmc1: error -5 whilst initialising SD card

 

\kernel\msm-4.9\arch\arm64\boot\dts\qcom\msm8953-mtp.dtsi
文件下加一个
&sdhc_2 {
    /* device core power supply */
    vdd-supply = <&pm8953_l11>;
    qcom,vdd-voltage-level = <2950000 2950000>;
    qcom,vdd-current-level = <15000 800000>;
+    qcom,vdd-always-on;  /* ==========加入一行代码给SD卡长供电====== */
    /* device communication power supply */
    vdd-io-supply = <&pm8953_l12>;
    qcom,vdd-io-voltage-level = <1800000 2950000>;
    qcom,vdd-io-current-level = <200 22000>;

    pinctrl-names = "active", "sleep";

    pinctrl-0 = <&sdc2_clk_on &sdc2_cmd_on &sdc2_data_on &sdc2_cd_on>;
    pinctrl-1 = <&sdc2_clk_off &sdc2_cmd_off &sdc2_data_off>;

 

 

重新刷新,SD卡可正常识别,说明硬件有问题,后面交给硬件工程师

转载地址:http://pxqn.baihongyu.com/

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