AM3358移植kernel3.14.26后LCD显示抖动

ThinkHero

Other Parts Discussed in Thread: AM3358

AM3358上运行kernel3.2.0时,LCD显示正常,用fbset显示:

mode "1024x768-28"
        # D: 30 MHz, H: 22.322 kHz, V: 27.694 Hz
        geometry 1024 768 1024 1536 16
        timings 33333 100 120 10 18 100 10
        accel false
        rgba 5/11,6/5,5/0,0/0
endmode

移植kernel3.14.26后,LCD能够显示,但是显示文字图形有点在抖动,用fbset看:

mode "1024x768-0"
        # D: 0.000 MHz, H: 0.000 kHz, V: 0.000 Hz
        geometry 1024 768 1024 2304 16
        timings 0 0 0 0 0 0 0
        accel true
        rgba 5/11,6/5,5/0,0/0
endmode

dts中的设置:

    panel {
        compatible = "ti,tilcdc,panel";
        status = "okay";
        pinctrl-names = "default";
        pinctrl-0 = <&lcd_pins>;
        panel-info {
            ac-bias           = <255>;
            ac-bias-intrpt    = <0>;
            dma-burst-sz      = <16>;
            bpp               = <16>;
            fdd               = <0xff>;
            sync-edge         = <0>;
            sync-ctrl         = <1>;
            raster-order      = <0>;
            fifo-th           = <6>;
            invert_pxl_clk    = <1>;
            tft-alt-mode      = <0>;
        };

        display-timings {
            1024x768p60 {
                clock-frequency = <56880000>;
                hactive = <1024>;
                vactive = <768>;
                hfront-porch = <76>;
                hback-porch = <50>;
                hsync-len = <50>;
                vfront-porch = <12>;
                vback-porch = <5>;
                vsync-len = <5>;
                hsync-active = <1>;
                vsync-active = <1>;
                de-active = <1>;
                pixelclk-active = <1>;
            };
        };
    };

在etc目录下建fb,modes,增加mode设置也没用.

请问有没有什么思路解决这个问题?

谢谢

9 年多前

0 ThinkHero 9 年多前

Prodigy 170 points

补充:

用示波器测量了AM3358到LVDS的pixclock,是56.88MHz.

自己编写了一个小程序,获取并显示fb的参数:

        if(ioctl(fb,FBIOGET_FSCREENINFO,&finfo)==0&&ioctl(fb,FBIOGET_VSCREENINFO,&vinfo)==0){
        printf("The fb pck is %d\n",vinfo.pixclock);   //显示时钟为0
            printf("The display mem is %d\n",finfo.smem_len);
            printf("The line length is %d in byte\n",finfo.line_length);
            printf("The X is %d\n",vinfo.xres);
            printf("The Y is %d\n",vinfo.yres);
        printf("The virtual X is %d\n",vinfo.xres_virtual);
            printf("The virtual Y is %d\n",vinfo.yres_virtual);
        printf("The X offset is %d\n",vinfo.xoffset);
        printf("The Y offset is %d\n",vinfo.yoffset);
            printf("The bits per pixel is %d\n",vinfo.bits_per_pixel);
            printf("The red length is %d in bits\n",vinfo.red.length);
            printf("The red offset is %d in bits\n",vinfo.red.offset);
            printf("The green length is %d in bits\n",vinfo.green.length);
            printf("The green offset is %d in bits\n",vinfo.green.offset);
            printf("The blue length is %d in bits\n",vinfo.blue.length);
            printf("The blue offset is %d in bits\n",vinfo.blue.offset);
        mLen=finfo.line_length/8*vinfo.yres;
        }