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drm: rcar-du: lvds: Add reset control

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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: Tomi Valkeinen <tomi.valkeinen+renesas@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
This commit is contained in:
Tomi Valkeinen 2023-01-23 12:47:38 +02:00 committed by Laurent Pinchart
parent 0e3a3d553f
commit 7df2524bd6
2 changed files with 21 additions and 2 deletions
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1
drivers/gpu/drm/rcar-du/Kconfig
View file

@ -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"

22
drivers/gpu/drm/rcar-du/rcar_lvds.c
View file

@ -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 = clk_prepare_enable(lvds->clocks.mod);
if (ret < 0)
ret = reset_control_deassert(lvds->rstc);
if (ret)
return ret;
ret = clk_prepare_enable(lvds->clocks.mod);
if (ret < 0)
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 = {