Currently when the 'power-supply' regulator is passed via device tree it does not actually work since drm_panel_prepare()/drm_panel_enable() are never called.

Quoting Thierry Reding: "It should really call drm_panel_prepare() and drm_panel_enable() while switching on the display pipeline and drm_panel_disable(), followed by drm_panel_unprepare() while switching off the display pipeline."

So do as suggested, so that the 'power-supply' regulator can be functional.

Reported-by: Breno Lima breno.lima@nxp.com Suggested-by: Thierry Reding thierry.reding@gmail.com Signed-off-by: Fabio Estevam fabio.estevam@nxp.com --- 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 955441f..766538f8 100644 --- a/drivers/gpu/drm/mxsfb/mxsfb_drv.c +++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.c @@ -102,14 +102,18 @@ static void mxsfb_pipe_enable(struct drm_simple_display_pipe *pipe, { struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);

+ 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);

+ drm_panel_disable(mxsfb->panel); mxsfb_crtc_disable(mxsfb); + drm_panel_unprepare(mxsfb->panel); }

static void mxsfb_pipe_update(struct drm_simple_display_pipe *pipe,