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[ Upstream commitd2bd3fcb82] The shutdown function can be called when the display is already unprepared. For example during reboot this trigger a kernel backlog. Calling the drm_panel_unprepare, allow us to avoid to trigger the kernel warning. Fixes:2e87bad7cd("drm/panel: Add Synaptics R63353 panel driver") Tested-by: Dario Binacchi <dario.binacchi@amarulasolutions.com> Signed-off-by: Michael Trimarchi <michael@amarulasolutions.com> Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com> Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org> Reviewed-by: Jessica Zhang <quic_jesszhan@quicinc.com> Link: https://lore.kernel.org/r/20241205163002.1804784-1-dario.binacchi@amarulasolutions.com Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org> Link: https://patchwork.freedesktop.org/patch/msgid/20241205163002.1804784-1-dario.binacchi@amarulasolutions.com Signed-off-by: Sasha Levin <sashal@kernel.org>