Re: [PATCH 4/6] media: qcom: camss: vfe: Add support for VFE 900

[Shawn Guo]

On Tue, Sep 15, 2026 at 05:34:14PM +0800, Wenmeng Liu wrote:
> The VFE on the Nord platform reuses the gen4 VFE driver but places its
> bus registers at a different base and does not implement the write
> master CGC override register. Add a VFE 900 variant to the gen4 driver
> to handle the different bus register base, the separate location of the
> test bus control register, and to skip the missing CGC override
> register.

Are you saying VFE 900 has no CGC override register? Hardware document
seems suggest there is TITAN_A_RT_0_IFE_0_CLC_BUS_WR_INPUT_IF_CGC_OVERRIDE
at bus-module + 0x08.

Shawn

> 
> In addition, the v900 ADDR_IMAGE register takes a full byte address
> rather than the 256-byte-unit encoding used by the gen4 baseline, and
> the full IFE write master client map places the RDI clients at index 28
> (the lite instances keep RDI0 at client 0).
> 
> Signed-off-by: Wenmeng Liu <wenmeng.liu@xxxxxxxxxxxxxxxx>