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

arnobpau — Mon, 02 Mar 2020 23:16:10 GMT

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.

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

joanxie — Tue, 03 Mar 2020 04:37:56 GMT

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

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

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

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