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Commitde04bb0089("drm/panel/panel-simple: Use the new allocation in place of devm_kzalloc()") moved the call to drm_panel_init into the devm_drm_panel_alloc(), which needs a connector type to initialize properly. In the panel-dpi compatible case, the passed panel_desc structure is an empty one used as a discriminant, and the connector type it contains isn't actually initialized. It is initialized through a call to panel_dpi_probe() later in the function, which used to be before the call to drm_panel_init() that got merged into devm_drm_panel_alloc(). So, we do need a proper panel_desc pointer before the call to devm_drm_panel_alloc() now. All cases associate their panel_desc with the panel compatible and use of_device_get_match_data, except for the panel-dpi compatible. In that case, we're expected to call panel_dpi_probe, which will allocate and initialize the panel_desc for us. Let's create such a helper function that would be called first in the driver and will lookup the desc by compatible, or allocate one if relevant. Reported-by: Francesco Dolcini <francesco@dolcini.it> Closes: https://lore.kernel.org/all/20250612081834.GA248237@francesco-nb/ Fixes:de04bb0089("drm/panel/panel-simple: Use the new allocation in place of devm_kzalloc()") Reviewed-by: Javier Martinez Canillas <javierm@redhat.com> Tested-by: Francesco Dolcini <francesco.dolcini@toradex.com> # Toradex Colibri iMX6 Link: https://lore.kernel.org/r/20250626-drm-panel-simple-fixes-v2-4-5afcaa608bdc@kernel.org Signed-off-by: Maxime Ripard <mripard@kernel.org>
Linux kernel
============
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