AM335X内核移植中的SD卡驱动问题

xiaoxia jiang

SDK版本为8.0，启动后打印log

[    1.693930] mousedev: PS/2 mouse device common for all mice
[    1.699960] i2c /dev entries driver
[    1.705907] omap_hsmmc 48060000.mmc: Got CD GPIO
[    1.746774] ledtrig-cpu: registered to indicate activity on CPUs
[    1.754566] oprofile: using arm/armv7
[    1.759592] Initializing XFRM netlink socket
[    1.764633] NET: Registered protocol family 10
[    1.774912] sit: IPv6 over IPv4 tunneling driver
[    1.782636] NET: Registered protocol family 17
[    1.787507] NET: Registered protocol family 15
[    1.792659] Key type dns_resolver registered
[    1.797426] omap_voltage_late_init: Voltage driver support not added
[    1.804085] sr_dev_init: No voltage domain specified for smartreflex0. Cannot initialize
[    1.812592] sr_dev_init: No voltage domain specified for smartreflex1. Cannot initialize
[    1.822562] ThumbEE CPU extension supported.
[    1.827207] Registering SWP/SWPB emulation handler
[    1.832240] SmartReflex Class3 initialized
[    1.848085] omap_hsmmc 48060000.mmc: no support for card's volts
[    1.854393] mmc0: error -22 whilst initialising SD card
[    1.861362] omap-gpmc 50000000.gpmc: GPMC revision 6.0
[    1.867151] gpmc_mem_init: disabling cs 0 mapped at 0x0-0x1000000

mmc0: error -22 whilst initialising SD card这是什么原因导致的？

8 年多前

0 Jian Zhou 8 年多前

TI__Mastermind 45260 points

请问这是TI开发板上的log还是您自己板子上的log？

0 xiaoxia jiang 8 年多前回复 Jian Zhou

Prodigy 190 points

自己板子上的

0 Yaoming Qin 8 年多前

TI__Mastermind 35157 points

查查您的硬件, 看是不是线记错了，您可以参考 http://www.friendlyarm.net/forum/topic/867

0 zoro 5 年多前

Prodigy 220 points

3年后, 遇到相同问题, 记录帮助后面的同志们

原因如下:

dts中mmc没有设置 vmmc-supply的值

因为我们的硬件sd上一直有电的,所以我把这个vmmc-supply删除了,觉得没有什么用.

但是代码中

omap_hsmmc_reg_get

-> mmc_regulator_get_supply

-> mmc_regulator_get_ocrmask 这里会去解析vmmc-supply相关的东西

解析ok的话会对mmc->ocr_avail赋值

这个值不对的话

其实在后面还有这样一句

if (!mmc->ocr_avail)
mmc->ocr_avail = mmc_pdata(host)->ocr_mask;

不幸的是 ocr_mask 也是空

于是mmc->ocr_avail为空就会打印

omap_hsmmc 48060000.mmc: no support for card's volts

对于不需要上下电的sd来说 vmmc-supply可以这样设置

&mmc1 {
    status = "okay";
    bus-width = <4>;
    pinctrl-names = "default";
    pinctrl-0 = <&mmc1_pins>;
    vmmc-supply = <&vmmcsd_fixed>;
    broken-cd;
};

/ {

.......

    vmmcsd_fixed: fixedregulator0 {
        compatible = "regulator-fixed";
        regulator-name = "vmmcsd_fixed";
        regulator-min-microvolt = <3300000>;
        regulator-max-microvolt = <3300000>;
    };
};

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AM335X内核移植中的SD卡驱动问题