SN65DP159: 4K HDMI monitor cannot display in AMD platform

Hugo Liu

Genius 5095 points

Part Number: SN65DP159

Hi Sir,

Our customer is used the AMD platform. But Through DP159EVM cant run the 4k 60Hz(4K 30Hz is OK).

We have change monitor & cable not improve. Do you have any idea or any experience?

Hugo

over 6 years ago

0 David (ASIC) Liu over 6 years ago

TI__Guru**** 176991 points

Hugo

Are they in pin strap or I2C mode?

Have they tried to connect the monitor directly to the AMD platform and see if 4K 60Hz is supported?

If it is in I2C mode, please dump out the DP159 registers.

Thanks
David

0 Brian Zhou over 6 years ago in reply to David (ASIC) Liu

TI__Guru*** 145550 points

Hugo:

any update?

0 Hugo Liu over 6 years ago in reply to Brian Zhou

Genius 5095 points

Hi Sir,

This is I2C register

Hugo

8132.DP159.zip

0 David (ASIC) Liu over 6 years ago in reply to Hugo Liu

TI__Guru**** 176991 points

Hugo

Register dump shows at 4k@60Hz, they need to change the TX_TERM_CTL (Register 0x0Bh, bit [4:3]) needs to be set to 0x11. Bit 1 of register 0x0Bh also needs to be set to 1 base on the DDC snoop.

When they change from 4k@30Hz to 4k@60Hz, do they toggle HDP_SNK?

Thanks

David

0 Hugo Liu over 6 years ago in reply to David (ASIC) Liu

Genius 5095 points

Hi David,

We had try 0xB0 bit[4:3] set to 0x11, and Bit 1 set to 1&0, but also not 4K60Hz.

0 David (ASIC) Liu over 6 years ago in reply to Hugo Liu

TI__Guru**** 176991 points

Hugo

4k@30Hz is HDMI1.4 and 4k@60Hz is HDMI2.0.

For HDMI1.4, TMDS_CLOCK_RATIO_STATUS bit needs to be set to 'b0, and for HDMI2.0, TMDS_CLOCK_RATIO_STATUS bit needs to be set to 'b1.

The TMDS_CLOCK_RATIO_STATUS bit can be set automatically by snooping the DDC bus, or can be set manually, but DDC_TRAINING must be disabled first.

Are they changing from HDM1.4 to HDMI2.0 on the fly? If they do, do they toggle HPD_SNK when they change from HDMI1.4 to HDMI2.0? If they do not toggle HPD_SNK, are they toggle PD_EN when changing from HDMI1.4 to HDMI2.0?

Please dump out both Page 0 and Page 1 register one more time after you make the change.

Thanks

David

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SN65DP159: 4K HDMI monitor cannot display in AMD platform