On 06.08.2018 21:31, Leonard Crestez wrote:
> Adding lcdif nodes to a power domain currently results in
> black/corrupted screens or hangs because power is not correctly enabled
> when required.
>
> Ensure power is on when display is active by adding
> pm_runtime_get/put_sync to mxsfb_pipe_enable/disable.
>
> Signed-off-by: Leonard Crestez <leonard.cres...@nxp.com>
Reviewed-by: Stefan Agner <ste...@agner.ch>
> ---
> drivers/gpu/drm/mxsfb/mxsfb_drv.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/gpu/drm/mxsfb/mxsfb_drv.c
> b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
> index ffe5137ccaf8..68d79f5dc0d3 100644
> --- a/drivers/gpu/drm/mxsfb/mxsfb_drv.c
> +++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
> @@ -101,23 +101,27 @@ static const struct drm_mode_config_funcs
> mxsfb_mode_config_funcs = {
> static void mxsfb_pipe_enable(struct drm_simple_display_pipe *pipe,
> struct drm_crtc_state *crtc_state,
> struct drm_plane_state *plane_state)
> {
> struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
> + struct drm_device *drm = pipe->plane.dev;
>
> + pm_runtime_get_sync(drm->dev);
> drm_panel_prepare(mxsfb->panel);
> mxsfb_crtc_enable(mxsfb);
> drm_panel_enable(mxsfb->panel);
> }
>
> static void mxsfb_pipe_disable(struct drm_simple_display_pipe *pipe)
> {
> struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
> + struct drm_device *drm = pipe->plane.dev;
>
> drm_panel_disable(mxsfb->panel);
> mxsfb_crtc_disable(mxsfb);
> drm_panel_unprepare(mxsfb->panel);
> + pm_runtime_put_sync(drm->dev);
> }
>
> static void mxsfb_pipe_update(struct drm_simple_display_pipe *pipe,
> struct drm_plane_state *plane_state)
> {
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