How to use the "MIPI_DSI_CLKCTRL.DPHY_SEL" register in i.MX7

toshiharu_shimi

Hello,

i.MX7Dual can select "1.5Gbps D-PHY" or "1Gbps D-PHY" with the D-PHY Select bit in the register "MIPI_DSI_CLKCTRL.DPHY_SEL".

In what case should "1Gbps D-PHY" be selected?

Alejandro_Salas

Hello @toshiharu_shimi

The DPHY_SEL bit is used to change the PHY version.

When it is 0, is selected the 2nd generation running up to 1.5Gbps.

When it is 1, is selected the 1st generation running up to 1.0Gbps.

Best regards,

Salas.

toshiharu_shimi

Hello @Alejandro_Salas

Thank you for your reply.

Does it mean that there are two D-PHY hardware blocks and I can choose one of them?

Normally, should I choose the 1.5Gbps D-PHY? Are there any cases where I should choose the 1.0Gbps D-PHY?
Currently, my product is using the 1.0Gbps D-PHY, but it occasionally malfunctions.
Since changing to the 1.5Gbps D-PHY prevents these malfunctions, should I use the 1.5Gbps D-PHY?

Alejandro_Salas

Hello @toshiharu_shimi

Yes, your diagram can represent that DPHY_SEL bit is doing.

About of 1.0Gbps phy, unfortunately we have not documented when 1.0Gbps is needed to use, but is prefereable to use the default DPHY (1.5Gbps).

Best regards,

--... ...--

Salas.