qq2440啟動linux後插入u盤出現usb 1-1: device descriptor read/64, error -110,usb 1

上位機：ubuntu14.04 64bit

下位機:qq2440

交叉編譯器:arm-linux-gcc 3.4.1

下位機使用的linux內核版本:kernel2.6.13

1.插入u盤時錯誤信息如下:

[root@FriendlyARM /home]# usb 1-1: new full speed USB device using s3c2410-ohci and address 6
usb 1-1: device descriptor read/64, error -110
usb 1-1: device descriptor read/64, error -110
usb 1-1: new full speed USB device using s3c2410-ohci and address 7
usb 1-1: device descriptor read/64, error -110
usb 1-1: device descriptor read/64, error -110
usb 1-1: new full speed USB device using s3c2410-ohci and address 8
usb 1-1: device not accepting address 8, error -110
usb 1-1: new full speed USB device using s3c2410-ohci and address 9
usb 1-1: device not accepting address 9, error -110

2.解決方案如下:

2.1修改drivers/usb/host/ohci-s3c2410.c文件，添加以下內容：

　　a.先添加頭文件#include <mach/regs-clock.h>

　　b.在s3c2410_start_hc函數中添加以下內容：

1. unsigned long upllvalue = (0x78 << 12) | (0x02 << 4) | (0x03);
2. while (upllvalue != __raw_readl(S3C2410_UPLLCON)) {
3. __raw_writel(upllvalue, S3C2410_UPLLCON);
4. mdelay(1);
5. }

　　添加後的s3c2410_start_hc函數如下:

1. static void s3c2410_start_hc(struct platform_device *dev, struct usb_hcd *hcd)
2. {
3. struct s3c2410_hcd_info *info = dev->dev.platform_data;
4. dev_dbg(&dev->dev, "s3c2410_start_hc:\n");
5. clk_enable(clk);
6. if (info != NULL) {
7. info->hcd = hcd;
8. info->report_oc = s3c2410_hcd_oc;
9. if (info->enable_oc != NULL) {
10. (info->enable_oc)(info, 1);
11. }
12. }
13. unsigned long upllvalue = (0x78 << 12) | (0x02 << 4) | (0x03);
14. while (upllvalue != __raw_readl(S3C2410_UPLLCON)) {
15. __raw_writel(upllvalue, S3C2410_UPLLCON);
16. mdelay(1);
17. }
18. }

　　2.2總結：以上修改的函數功能是啟動主機控制器,因為usb時鐘設置有問題，因而在開啟主機控制器時修改時鐘,修改後的S3C2410_UPLLCON的值為0xF4100008;

3.注意：本版本內核沒有頭文件regs-clock.h，因而我從其他內核中復制過來的，命令如下:

jello@jello-Inspiron-N4050:~/Downloads/qq2440/linux/kernel-2.6.13$ cp /tftpboot/kernel-2.6.35.7/arch/arm/mach-s3c2410/include/mach/regs-clock.h ./