IMX6: IPU1_DI1 on LVDS0

[jolaf]

Hi,

I need to configure a dual screen on an IMX6S7CVM08AC:

   - first screen is connected through parallell port on IPU1_DI0

   - second screen is connected through an LVDS bridge on LVDS0

Since IPU1_DI0 is used by my first screen, i need to redirect IPU1_DI1 on LVDS0.

On the reference manual (IMX6SDLRM) chapter 40.5.1, the table 40-5 "Channel Mapping" suggest that it is not possible to use IPU1_DI1 with LVDS0 appart from dual mode or split mode.

I'm trying to use the dual mode but ch0_mode field value from LDB_CTRL stay at 01 instead of 11:

   /unit_tests/memtool -32 20E0008 1
   E
   Reading 0x1 count starting at address 0x020E0008

   0x020E0008: 000002A5

Could someone confirm (or infirm) that IPU1_DI1 can be used on LVDS0 ?

Thanks in advance.

[igorpadykov]

Hi jolaf

one can try to use IOMUXC_GPR3 field LVDS0_MUX_CTL,described in

sect.37.4.4 GPR3 (IOMUXC_GPR3) i.MX6SDL Reference Manual

http://www.nxp.com/assets/documents/data/en/reference-manuals/IMX6SDLRM.pdf 

Best regards
igor
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[jolaf]

Hi Igor,

Thanks for your quick response. The output of memtool when I read the IOMUXC_GPR3 register is the following:

   /unit_tests/memtool -32 20E000C 1
   E
   Reading 0x1 count starting at address 0x020E000C

   0x020E000C: 01E00140

So the LVDS0_MUX_CTL field seems ok (0b01 = LVDS0 source is IPU1 DI1 port).

Best regards,

Jolaf

[igorpadykov]

Hi Jolaf

so what is the problem, had you configured for custom lcd timings and use appropriate

kernel boot parameter as for example on

https://community.nxp.com/thread/355690 

Best regards
igor