Commit 7df2524b authored by Tomi Valkeinen's avatar Tomi Valkeinen Committed by Laurent Pinchart
Browse files

drm: rcar-du: lvds: Add reset control 



Reset LVDS using the reset control as CPG reset/release is required in
the hardware manual sequence.

Based on a BSP patch from Koji Matsuoka <koji.matsuoka.xm@renesas.com>.

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 0e3a3d55

drivers/gpu/drm/rcar-du/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -44,6 +44,7 @@ config DRM_RCAR_LVDS 
	depends on PM

	select DRM_KMS_HELPER

	select DRM_PANEL

	select RESET_CONTROLLER



config DRM_RCAR_USE_MIPI_DSI

	bool "R-Car DU MIPI DSI Encoder Support"

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

+19 −1
Original line number Diff line number Diff line
@@ -17,6 +17,7 @@ 
#include <linux/of_graph.h>

#include <linux/platform_device.h>

#include <linux/pm_runtime.h>

#include <linux/reset.h>

#include <linux/slab.h>

#include <linux/sys_soc.h>
@@ -61,6 +62,7 @@ struct rcar_lvds_device_info { 
struct rcar_lvds {

	struct device *dev;

	const struct rcar_lvds_device_info *info;

	struct reset_control *rstc;



	struct drm_bridge bridge;
@@ -845,6 +847,11 @@ static int rcar_lvds_probe(struct platform_device *pdev) 
	if (ret < 0)

		return ret;



	lvds->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);

	if (IS_ERR(lvds->rstc))

		return dev_err_probe(&pdev->dev, PTR_ERR(lvds->rstc),

				     "failed to get cpg reset\n");



	pm_runtime_enable(&pdev->dev);



	drm_bridge_add(&lvds->bridge);
@@ -924,6 +931,8 @@ static int rcar_lvds_runtime_suspend(struct device *dev) 


	clk_disable_unprepare(lvds->clocks.mod);



	reset_control_assert(lvds->rstc);



	return 0;

}
@@ -932,11 +941,20 @@ static int rcar_lvds_runtime_resume(struct device *dev) 
	struct rcar_lvds *lvds = dev_get_drvdata(dev);

	int ret;



	ret = reset_control_deassert(lvds->rstc);

	if (ret)

		return ret;



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

	if (ret < 0)

		return ret;

		goto err_reset_assert;



	return 0;



err_reset_assert:

	reset_control_assert(lvds->rstc);



	return ret;

}



static const struct dev_pm_ops rcar_lvds_pm_ops = {