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| author | Tomi Valkeinen <tomi.valkeinen+renesas@ideasonboard.com> | 2023-01-23 13:47:38 +0300 |
|---|---|---|
| committer | Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> | 2023-01-23 18:56:51 +0300 |
| commit | 7df2524bd69e10f4c8f0c7346bcad57903329e85 (patch) | |
| tree | ddb58fa2a3017618b38824f307f8a71554e1776f /drivers/gpu/drm/rcar-du | |
| parent | 0e3a3d553f0c5d832d016207a8a2e3f67195bbcc (diff) | |
| download | linux-7df2524bd69e10f4c8f0c7346bcad57903329e85.tar.xz | |
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: 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>
Diffstat (limited to 'drivers/gpu/drm/rcar-du')
| -rw-r--r-- | drivers/gpu/drm/rcar-du/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/gpu/drm/rcar-du/rcar_lvds.c | 20 |
2 files changed, 20 insertions, 1 deletions
diff --git a/drivers/gpu/drm/rcar-du/Kconfig b/drivers/gpu/drm/rcar-du/Kconfig index dc5d663ed884..53c356aed5d5 100644 --- a/drivers/gpu/drm/rcar-du/Kconfig +++ b/drivers/gpu/drm/rcar-du/Kconfig @@ -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" diff --git a/drivers/gpu/drm/rcar-du/rcar_lvds.c b/drivers/gpu/drm/rcar-du/rcar_lvds.c index 7cf515e43079..a11201e4d31b 100644 --- a/drivers/gpu/drm/rcar-du/rcar_lvds.c +++ b/drivers/gpu/drm/rcar-du/rcar_lvds.c @@ -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 = { |