Commit 0e3a3d55 authored by Tomi Valkeinen's avatar Tomi Valkeinen Committed by Laurent Pinchart
Browse files

drm: rcar-du: lvds: Add runtime PM 



Add simple runtime PM suspend and resume functionality.

Signed-off-by: default avatarTomi Valkeinen <tomi.valkeinen+renesas@ideasonboard.com>
Reviewed-by: default avatarLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: default avatarLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
parent 686cd4fd

drivers/gpu/drm/rcar-du/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -41,6 +41,7 @@ config DRM_RCAR_USE_LVDS 
config DRM_RCAR_LVDS

	def_tristate DRM_RCAR_DU

	depends on DRM_RCAR_USE_LVDS

	depends on PM

	select DRM_KMS_HELPER

	select DRM_PANEL

drivers/gpu/drm/rcar-du/rcar_lvds.c

+37 −6
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ 
#include <linux/of_device.h>

#include <linux/of_graph.h>

#include <linux/platform_device.h>

#include <linux/pm_runtime.h>

#include <linux/slab.h>

#include <linux/sys_soc.h>
@@ -316,8 +317,8 @@ int rcar_lvds_pclk_enable(struct drm_bridge *bridge, unsigned long freq) 


	dev_dbg(lvds->dev, "enabling LVDS PLL, freq=%luHz\n", freq);



	ret = clk_prepare_enable(lvds->clocks.mod);

	if (ret < 0)

	ret = pm_runtime_resume_and_get(lvds->dev);

	if (ret)

		return ret;



	__rcar_lvds_pll_setup_d3_e3(lvds, freq, true);
@@ -337,7 +338,7 @@ void rcar_lvds_pclk_disable(struct drm_bridge *bridge) 


	rcar_lvds_write(lvds, LVDPLLCR, 0);



	clk_disable_unprepare(lvds->clocks.mod);

	pm_runtime_put_sync(lvds->dev);

}

EXPORT_SYMBOL_GPL(rcar_lvds_pclk_disable);
@@ -396,8 +397,8 @@ static void __rcar_lvds_atomic_enable(struct drm_bridge *bridge, 
	u32 lvdcr0;

	int ret;



	ret = clk_prepare_enable(lvds->clocks.mod);

	if (ret < 0)

	ret = pm_runtime_resume_and_get(lvds->dev);

	if (ret)

		return;



	/* Enable the companion LVDS encoder in dual-link mode. */
@@ -551,7 +552,7 @@ static void rcar_lvds_atomic_disable(struct drm_bridge *bridge, 
		lvds->companion->funcs->atomic_disable(lvds->companion,

						       old_bridge_state);



	clk_disable_unprepare(lvds->clocks.mod);

	pm_runtime_put_sync(lvds->dev);

}



static bool rcar_lvds_mode_fixup(struct drm_bridge *bridge,
@@ -844,6 +845,8 @@ static int rcar_lvds_probe(struct platform_device *pdev) 
	if (ret < 0)

		return ret;



	pm_runtime_enable(&pdev->dev);



	drm_bridge_add(&lvds->bridge);



	return 0;
@@ -855,6 +858,8 @@ static int rcar_lvds_remove(struct platform_device *pdev) 


	drm_bridge_remove(&lvds->bridge);



	pm_runtime_disable(&pdev->dev);



	return 0;

}
@@ -913,11 +918,37 @@ static const struct of_device_id rcar_lvds_of_table[] = { 


MODULE_DEVICE_TABLE(of, rcar_lvds_of_table);



static int rcar_lvds_runtime_suspend(struct device *dev)

{

	struct rcar_lvds *lvds = dev_get_drvdata(dev);



	clk_disable_unprepare(lvds->clocks.mod);



	return 0;

}



static int rcar_lvds_runtime_resume(struct device *dev)

{

	struct rcar_lvds *lvds = dev_get_drvdata(dev);

	int ret;



	ret = clk_prepare_enable(lvds->clocks.mod);

	if (ret < 0)

		return ret;



	return 0;

}



static const struct dev_pm_ops rcar_lvds_pm_ops = {

	SET_RUNTIME_PM_OPS(rcar_lvds_runtime_suspend, rcar_lvds_runtime_resume, NULL)

};



static struct platform_driver rcar_lvds_platform_driver = {

	.probe		= rcar_lvds_probe,

	.remove		= rcar_lvds_remove,

	.driver		= {

		.name	= "rcar-lvds",

		.pm	= &rcar_lvds_pm_ops,

		.of_match_table = rcar_lvds_of_table,

	},

};