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请教： VPBE的Gamma Correction RAM Table 写不进去，为什么？

Cheng Jordan
Intellectual 370 points


各位专家大家好：
     我根据 VPBE UG 的4.5.5.7 Gamma Correction RAM Table 对RAM 进行如下操作:
static void davinci_enc_set_prgb(struct vid_enc_mode_info *mode_info)
{
 
       unsigned int pll_div6; //added by chengxiaoguang 11-09-19
   u32 readparm,ii;
 
 
................................................
 
 
////read gamma control register value ;
    readparm = dispc_reg_in(VENC_GAMCTL);
    printk("VENC_GAMCTL = %x \n",readparm);
 
    ///////dispc_reg_out(VENC_RAMADR,0);
    for(ii=0;ii<0x7F;ii++)
          {
       dispc_reg_out(VENC_RAMADR,ii);
               dispc_reg_out(VENC_RAMPORT,((ii<<9)|((ii<<1)+1)));
            }
    dispc_reg_out(VENC_RAMADR,0);
    for(ii=0;ii<0x7F;ii++)
         {
       readparm=dispc_reg_in(VENC_RAMPORT);
        printk("%08x ",readparm);
         }
 
 
.......................................................
 
    dispc_reg_merge(VENC_GAMCTL,3 , 1);
 
 
}

发现读出来的值都是00，并且打开了gamma 矫正选项以后屏是黑的，请问哪里出了问题，谢谢。