[PATCH for-v5.4.y 3/3] drm/msm/dsi: Enable runtime PM

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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>
---
 drivers/gpu/drm/msm/dsi/phy/dsi_phy.c | 4 ++++
 1 file changed, 4 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..925262ea6f14 100644
--- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c
+++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c
@@ -606,6 +606,10 @@ static int dsi_phy_driver_probe(struct platform_device *pdev)
 			goto fail;
 	}
 
+	ret = devm_pm_runtime_enable(&pdev->dev);
+	if (ret)
+		return ret;
+
 	/* PLL init will call into clk_register which requires
 	 * register access, so we need to enable power and ahb clock.
 	 */
-- 
2.25.1





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