drm/stm: add sleep power management (df61c776) · Commits · 戴 / test

drivers/gpu/drm/stm/drv.c

+35 −0

Original line number	Diff line number	Diff line
		@@ -129,6 +129,40 @@ static void drv_unload(struct drm_device *ddev)
		drm_mode_config_cleanup(ddev);
		}

		static __maybe_unused int drv_suspend(struct device *dev)
		{
		struct drm_device *ddev = dev_get_drvdata(dev);
		struct ltdc_device *ldev = ddev->dev_private;
		struct drm_atomic_state *state;

		drm_kms_helper_poll_disable(ddev);
		state = drm_atomic_helper_suspend(ddev);
		if (IS_ERR(state)) {
		drm_kms_helper_poll_enable(ddev);
		return PTR_ERR(state);
		}
		ldev->suspend_state = state;
		ltdc_suspend(ddev);

		return 0;
		}

		static __maybe_unused int drv_resume(struct device *dev)
		{
		struct drm_device *ddev = dev_get_drvdata(dev);
		struct ltdc_device *ldev = ddev->dev_private;

		ltdc_resume(ddev);
		drm_atomic_helper_resume(ddev, ldev->suspend_state);
		drm_kms_helper_poll_enable(ddev);

		return 0;
		}

		static const struct dev_pm_ops drv_pm_ops = {
		SET_SYSTEM_SLEEP_PM_OPS(drv_suspend, drv_resume)
		};

		static int stm_drm_platform_probe(struct platform_device *pdev)
		{
		struct device *dev = &pdev->dev;
		@@ -186,6 +220,7 @@ static struct platform_driver stm_drm_platform_driver = {
		.driver = {
		.name = "stm32-display",
		.of_match_table = drv_dt_ids,
		.pm = &drv_pm_ops,
		},
		};

+24 −0

Original line number	Diff line number	Diff line
		@@ -1062,6 +1062,30 @@ static int ltdc_get_caps(struct drm_device *ddev)
		return 0;
		}

		void ltdc_suspend(struct drm_device *ddev)
		{
		struct ltdc_device *ldev = ddev->dev_private;

		DRM_DEBUG_DRIVER("\n");
		clk_disable_unprepare(ldev->pixel_clk);
		}

		int ltdc_resume(struct drm_device *ddev)
		{
		struct ltdc_device *ldev = ddev->dev_private;
		int ret;

		DRM_DEBUG_DRIVER("\n");

		ret = clk_prepare_enable(ldev->pixel_clk);
		if (ret) {
		DRM_ERROR("failed to enable pixel clock (%d)\n", ret);
		return ret;
		}

		return 0;
		}

		int ltdc_load(struct drm_device *ddev)
		{
		struct platform_device *pdev = to_platform_device(ddev->dev);

+3 −0

Original line number	Diff line number	Diff line
		@@ -36,6 +36,7 @@ struct ltdc_device {
		u32 error_status;
		u32 irq_status;
		struct fps_info plane_fpsi[LTDC_MAX_LAYER];
		struct drm_atomic_state *suspend_state;
		};

		bool ltdc_crtc_scanoutpos(struct drm_device *dev, unsigned int pipe,
		@@ -45,5 +46,7 @@ bool ltdc_crtc_scanoutpos(struct drm_device *dev, unsigned int pipe,

		int ltdc_load(struct drm_device *ddev);
		void ltdc_unload(struct drm_device *ddev);
		void ltdc_suspend(struct drm_device *ddev);
		int ltdc_resume(struct drm_device *ddev);

		#endif