On Mon, 29 Jan 2024 at 07:46, Amit Pundir amit.pundir@linaro.org wrote:
From: Konrad Dybcio konrad.dybcio@linaro.org
[ 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@linaro.org Reviewed-by: Dmitry Baryshkov dmitry.baryshkov@linaro.org Patchwork: https://patchwork.freedesktop.org/patch/543352/ Link: https://lore.kernel.org/r/20230620-topic-dsiphy_rpm-v2-2-a11a751f34f0@linaro... Signed-off-by: Dmitry Baryshkov dmitry.baryshkov@linaro.org Stable-dep-of: 3d07a411b4fa ("drm/msm/dsi: Use pm_runtime_resume_and_get to prevent refcnt leaks") Signed-off-by: Amit Pundir amit.pundir@linaro.org
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