Re: [PATCH RESEND] drm/bridge: tc358768: Enforce input bus flags via atomic_check

[Francesco Dolcini]

On Mon, Jul 06, 2026 at 10:24:17AM -0300, Leonardo Costa wrote:
> From: Leonardo Costa <leonardo.costa@xxxxxxxxxxx>
> 
> The tc358768 declares static bridge timings requiring pixel data to be
> sampled on the positive clock edge.
> 
> However, the DRM core default propagation simply copies the output-side
> bus flags, coming from the next bridge, connector or panel, to the
> input side. If the propagated flags are incompatible with the bridge
> ones, the data is wrongly sampled, typically resulting in visual
> artifacts on the panel.
> 
> Implement the atomic_check hook, replacing the mutually exclusive
> mode_fixup, and set the bridge state input bus flags to the ones
> required by the tc358768. The sync polarity defaulting previously done
> in mode_fixup is carried over into atomic_check unchanged.
> 
> Fixes: ff1ca6397b1d ("drm/bridge: Add tc358768 driver")
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Leonardo Costa <leonardo.costa@xxxxxxxxxxx>

Reviewed-by: Francesco Dolcini <francesco.dolcini@xxxxxxxxxxx>