Hi Tomi,
Thank you for the patch.
On Fri, Jan 20, 2023 at 10:50:05AM +0200, Tomi Valkeinen wrote:
> 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...@renesas.com>.
>
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen+rene...@ideasonboard.com>
> ---
> drivers/gpu/drm/rcar-du/Kconfig | 1 +
> drivers/gpu/drm/rcar-du/rcar_lvds.c | 19 ++++++++++++++++++-
> 2 files changed, 19 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/rcar-du/Kconfig b/drivers/gpu/drm/rcar-du/Kconfig
> index a8f862c68b4f..151e400b996d 100644
> --- a/drivers/gpu/drm/rcar-du/Kconfig
> +++ b/drivers/gpu/drm/rcar-du/Kconfig
> @@ -43,6 +43,7 @@ config DRM_RCAR_LVDS
> select DRM_PANEL
> select OF_FLATTREE
> select OF_OVERLAY
> + 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 8e1be51fbee6..668604616bfd 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 +847,10 @@ 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");
Missing blank line.
Reviewed-by: Laurent Pinchart <laurent.pinch...@ideasonboard.com>
> pm_runtime_enable(&pdev->dev);
>
> drm_bridge_add(&lvds->bridge);
> @@ -924,6 +930,8 @@ static int rcar_lvds_runtime_suspend(struct device *dev)
>
> clk_disable_unprepare(lvds->clocks.mod);
>
> + reset_control_assert(lvds->rstc);
> +
> return 0;
> }
>
> @@ -932,11 +940,20 @@ 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 = {
--
Regards,
Laurent Pinchart
