How can I make the mask channel the IPU of i.MX 6 work?

[arnobpau]

• My goal is:
  • I want to test the mask channel of the IPU of i.MX 6. I have successfully enabled and used the overlay channel, so I know how to use it. But the mask channel does not work. How can I do this? The following mentions my procedure in detail.
• I have used the chipset:
  • i.MX 6Dual/6Quad Applications Processor
• I have used the board:
  • BD-SL-i.MX6 (SABRE Lite)
• I have tried the following register operations for IPU masking:
  • I have checked several registers to enable masking with IPU:
    • IPUx_CONF
      • DP_EN: I have set 1.
      • DC_EN: I have set 1.
      • DI0_EN: I have set 1.
      • DI1_EN: I have set 1.
      • DMFC_EN: I have set 1.
    • IPUx_IDMAC_CH_EN_2
      • IDMAC_CH_EN_44: I have set 1.
      • IDMAC_CH_EN_40: I have set 1.
    • IPUx_DI0_GENERAL
      • Di0_mask_sel: I have set 1.
    • IPUx_DI1_GENERAL
      • Di1_mask_sel: I have set 1.
    • IPUx_DC_GEN
      • IPUx_DC_GEN_MASK_EN: I have set 1.
      • IPUx_DC_GEN_MASK4CHAN_5: I have set 1.
    • IPUx_DC_DI0_CONF_1
      • [31-0]: I have set 0xFFFF.
    • IPUx_DC_DI1_CONF_1
      • [31-0]: I have set 0xFFFF.
    • IPUx_DMFC_GENERAL_1
      • DMFC_burst_size_9: I have set 0b01.
• I have tried the following memory operations for IPU masking:
  • To enable masking, I have written into Channel Parameter Memory (CPMEM) at channel 44 for the following purposes:
    • Frame Width: I have set 500.
    • Frame Height: I have set 500.
    • Stride Line: I have left it unchanged. So the value is set by the Linux kernel.
    • Ext Mem Buffer 0 Address: I have set ((CFG_FBMEM_START + 0x600000) / 8).
    • Ext Mem Buffer 1 Address: I have set ((CFG_FBMEM_START + 0x600000) / 8).
    • Pixel Format Select: I have set 4'h6.

[joanxie]

you need to set register according to your connection, since you set IPUx_DC_GEN_MASK4CHAN_5 to 1, so you need MEM->DP, and use channel #23 as input channel, right？and you can refer to the display driver:

ipu_disp.c\ipu3\mxc\drivers - linux-imx - i.MX Linux kernel