DM365 使用BT656协议驱动LCD的实现
前两天已经调好了，主要是对davinci_platform.c的修改
因为输入输出都为pal的制式，所以就在pal的函数中进行了修改。
在PAL设置的函数中，修改如下：
/*
* setting PAL mode
*/
static void davinci_enc_set_pal(struct vid_enc_mode_info *mode_info)
{
enableDigitalOutput(0); //gjx orignal : 0
if (cpu_is_davinci_dm355()) {
dispc_reg_out(VENC_CLKCTL, 0x1);
dispc_reg_out(VENC_VIDCTL, 0);
/* DM350 Configure VDAC_CONFIG */
davinci_writel(0x0E21A6B6, DM3XX_VDAC_CONFIG);
} else if (cpu_is_davinci_dm365()) {
dispc_reg_out(VENC_VMOD,0x1043);//gjx 1:YCC8; 0: ;4:PAL; 3:Composite output enable.Video encoder enable.
dispc_reg_out(VENC_CLKCTL, 0x11); //gjx enable digital lcd clock;orignal:0x1
dispc_reg_out(VENC_VIDCTL, 0x6000); //gjx vclk pin output enable & vclk polarity inverse(6000)
dispc_reg_out(VENC_YCCCTL, 0x1); //gjx bt656
/* Set OSD clock and OSD Sync Adavance registers */
dispc_reg_out(VENC_OSDCLK0, 1); //gjx
dispc_reg_out(VENC_OSDCLK1, 2); //gjx
dispc_reg_out(VENC_VDPRO, 0x20);//xjx
davinci_writel(0x081141CF, DM3XX_VDAC_CONFIG);
} else {
/* to set VENC CLK DIV to 1 - final clock is 54 MHz */
dispc_reg_merge(VENC_VIDCTL, 0, 1 << 1);
/* Set REC656 Mode */
dispc_reg_out(VENC_YCCCTL, 0x1);
}
dispc_reg_out(VENC_SYNCCTL,0);//gjx
if (cpu_is_davinci_dm355()) {
davinci_writel(mode_info->left_margin,
(DM355_OSD_REG_BASE + OSD_BASEPX));
davinci_writel(mode_info->upper_margin,
(DM355_OSD_REG_BASE + OSD_BASEPY));
} else if (cpu_is_davinci_dm365()) {
davinci_writel(mode_info->left_margin,
(DM365_OSD_REG_BASE + OSD_BASEPX));
/* PAL display shows shakiness in the OSD0 when
* this is set to upper margin. Need to bump it
* by 2
*/
davinci_writel((mode_info->upper_margin + 2),
(DM365_OSD_REG_BASE + OSD_BASEPY));
} else {
davinci_writel(mode_info->left_margin,
(DM644X_OSD_REG_BASE + OSD_BASEPX));
davinci_writel(mode_info->upper_margin,
(DM644X_OSD_REG_BASE + OSD_BASEPY));
}
dispc_reg_merge(VENC_VMOD, VENC_VMOD_VENC, VENC_VMOD_VENC);
dispc_reg_out(VENC_DACTST, 0x0);
dispc_reg_out(VENC_CMPNT, 0);
}
环境变量
setenv bootargs mem=70M console=ttyS0,115200n8 root=/dev/nfs rw nfsroot=192.168.0.168:/home/gjx/workdir/filesys ip=192.168.0.3:192.168.0.168:192.168.0.1:255.255.255.0::eth0:off eth=00:40:01:2B:64:60 video=davincifb:vid0=OFF:vid1=OFF:osd0=720x576x16,4050K dm365_imp.oper_mode=0 davinci_capture.device_type=1 davinci_enc_mngr.ch0_mode=pal
这样重新编译内核就直接可以输出bt656的视频了，直接接支持BT656的LCD就显示成功了。