[ts-7000] lcd driver two weeks for nothing

["chaisc97" <>]

I try to write a LCD driver, it works fine. i can show the picture on
the screen, however when i put QT on the embedded board(TS7200), when
the mouse moves, the screen show the wrong result, i found in some
place i can get the correct data from the video memory sometimes not.
i have test two video driver as follows.

the first one
/*******************************************************/
s1d13xxx_mmap(struct fb_info *info, struct file *file, struct
vm_area_struct *vma)
{
        unsigned long off, start;
        u32 len;
        unsigned long size  = vma->vm_end - vma->vm_start;
        unsigned long page, pos;

        off = vma->vm_pgoff << PAGE_SHIFT;
        vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);

        printk("vma->flag=%x\n",vma->vm_flags);
        vma->vm_flags |=VM_RESERVED;
        vma->vm_flags |=VM_READHINTMASK;
        vma->vm_flags |=VM_IO;
        vma->vm_flags |=VM_SHM;
        vma->vm_flags |= VM_LOCKED;
        printk("vma->flag=%x\n",vma->vm_flags);

        if ((vma->vm_end - vma->vm_start) > len)
                return -EINVAL;

        vma->vm_pgoff = off >> PAGE_SHIFT;

        start=vma->vm_start;
        size=vma->vm_end - vma->vm_start;
        pos=S1D_PHYSICAL_VMEM_ADDR;
while(size>0)
        {
                 if (remap_page_range(start,pos,PAGE_SIZE, PAGE_SHARED))
                        return -EAGAIN;
                        start += PAGE_SIZE;
                         pos += PAGE_SIZE;
                 if (size > PAGE_SIZE)
                        size -= PAGE_SIZE;
                else
                        size = 0;
        }

/***********************************************/
second one 
i just open the fd=/dev/mem
 mapped_memlen, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0x20200000);

what's wrong for my code



 
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