Add eDP display overlays for hamoa and purwa IoT EVKs - #1706
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August 18, 2026 16:57
Hamoa IoT EVKs are available with and without an eDP panel. When the panel is absent, DP3 is unused, but the base DTS still describes the eDP panel and display path. This causes the eDP driver to probe an unavailable panel, resulting in AUX probe timeouts and missing display modes. Userspace then attempts display commits through the eDP connector, causing repeated DPU vblank, frame-done, and IRQ timeout errors. Move the eDP-specific nodes into an overlay so the base DTB describes the configuration without the panel, while the overlay enables eDP for boards with the panel connected. DT overlays cannot remove properties from a node defined in the base DTB, so the /delete-property/ of #sound-dai-cells is moved into the base DTS instead of the overlay, where it takes effect. Link: https://lore.kernel.org/all/20260818-edp_overlay_for-next-v2-1-bd811d378fb7@oss.qualcomm.com/ Signed-off-by: Anand Tiwari <anand.tiwari@oss.qualcomm.com>
Purwa IoT EVKs are available with and without an eDP panel. When the panel is absent, DP3 is unused, but the base DTS still describes the eDP panel and display path. This causes the eDP driver to probe an unavailable panel, resulting in AUX probe timeouts and missing display modes. Userspace then attempts display commits through the eDP connector, causing repeated DPU vblank, frame-done, and IRQ timeout errors. Move the eDP-specific nodes into an overlay so the base DTB describes the configuration without the panel, while the overlay enables eDP for boards with the panel connected. DT overlays cannot remove properties from a node defined in the base DTB, so the /delete-property/ of #sound-dai-cells is moved into the base DTS instead of the overlay, where it takes effect. Link: https://lore.kernel.org/all/20260818-edp_overlay_for-next-v2-2-bd811d378fb7@oss.qualcomm.com/ Signed-off-by: Anand Tiwari <anand.tiwari@oss.qualcomm.com>
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August 18, 2026 14:25
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Both Hamoa and Purwa IoT EVKs are available in headed and headless
variants. The headed variants use an eDP display panel connected via
the DP3 controller, while the headless variants do not include a
display.
The existing DT is causing the eDP-panel driver to probe an unavailable
panel, resulting in AUX probe timeouts and missing display modes.
Userspace then attempts display commits through the eDP connector,
causing repeated DPU vblank, frame-done, and IRQ timeout errors.
Move the eDP-specific nodes out of the base DTS files into separate
DTBO overlays for each board. This allows the base DTBs to be used
as-is for headless variants, while the composite DTBs enable eDP
support on headed variants.
CRs-Fixed: 4543794, 4543797