Description
Describe the bug
Logged from https://forums.raspberrypi.com/viewtopic.php?p=2315116#p2315116
Waveshare 13.3" DSI display in 4 lane mode ends up asking a CM4 for a PV timing with horizontal front porch of 320. The resulting timing appears to be an HFP of 64 (320 & 0xff).
PV feeding HDMI or DPI outputs are quite happy to take HFP > 255.
There are a couple of other PV register bits that are set differently for DSI to the others, but none immediately scream that they are a limitation.
Steps to reproduce the behaviour
dtoverlay=vc4-kms-dsi-waveshare-panel,13_3inch_4lane
kmstest --flip will report a refresh rate of 66.7Hz instead of 60Hz.
DSI analyser agrees.
Device (s)
Raspberry Pi CM4, Raspberry Pi CM4 Lite
System
Raspberry Pi OS with 6.12.33 kernel.
Logs
No response
Additional context
No response
Metadata
Metadata
Assignees
Labels
No labels