Hi,
v5.4.y commit 31b169a8bed7 ("drm/msm/dsi: Use pm_runtime_resume_and_get to prevent refcnt leaks"), which is commit 3d07a411b4fa upstream, broke display on Dragonboard 845c(sdm845). Cherry-picking commit 6ab502bc1cf3 ("drm/msm/dsi: Enable runtime PM") from the original patch series https://patchwork.freedesktop.org/series/119583/ and it's dependent runtime PM helper routines as suggested by Dmitry https://lore.kernel.org/stable/CAA8EJpo7q9qZbgXHWe7SuQFh0EWW0ZxGL5xYX4nckoFG... fixes that display regression on DB845c.
Dmitry Baryshkov (1): PM: runtime: add devm_pm_runtime_enable helper
Douglas Anderson (1): PM: runtime: Have devm_pm_runtime_enable() handle pm_runtime_dont_use_autosuspend()
Konrad Dybcio (1): drm/msm/dsi: Enable runtime PM
drivers/base/power/runtime.c | 22 ++++++++++++++++++++++ drivers/gpu/drm/msm/dsi/phy/dsi_phy.c | 4 ++++ include/linux/pm_runtime.h | 9 +++++++++ 3 files changed, 35 insertions(+)