On Mon, 29 Jan 2024 at 07:46, Amit Pundir <amit.pundir@xxxxxxxxxx> wrote: > > From: Konrad Dybcio <konrad.dybcio@xxxxxxxxxx> > > [ Upstream commit 6ab502bc1cf3147ea1d8540d04b83a7a4cb6d1f1 ] > > Some devices power the DSI PHY/PLL through a power rail that we model > as a GENPD. Enable runtime PM to make it suspendable. > > Signed-off-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxx> > Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx> > Patchwork: https://patchwork.freedesktop.org/patch/543352/ > Link: https://lore.kernel.org/r/20230620-topic-dsiphy_rpm-v2-2-a11a751f34f0@xxxxxxxxxx > Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx> > Stable-dep-of: 3d07a411b4fa ("drm/msm/dsi: Use pm_runtime_resume_and_get to prevent refcnt leaks") > Signed-off-by: Amit Pundir <amit.pundir@xxxxxxxxxx> > --- > Rebased to v5.4.y: s/devm_pm_runtime_enable/pm_runtime_enable This leaks pm runtime enablement past the DSI PHY probe/remove cycle. Either the devm_pm_runtime_enable() API should be included into the backport, or ite emulation via devm_add_action_or_reset(). > > Alternate solution maybe to revert the problematic commit 31b169a8bed7 > ("drm/msm/dsi: Use pm_runtime_resume_and_get to prevent refcnt leaks") > from v5.4.y which broke display on DB845c. > > drivers/gpu/drm/msm/dsi/phy/dsi_phy.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c b/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c > index 1582386fe162..30f07b8a5421 100644 > --- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c > +++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c > @@ -606,6 +606,8 @@ static int dsi_phy_driver_probe(struct platform_device *pdev) > goto fail; > } > > + pm_runtime_enable(&pdev->dev); > + > /* PLL init will call into clk_register which requires > * register access, so we need to enable power and ahb clock. > */ > -- > 2.25.1 > -- With best wishes Dmitry
