[PATCH v2 3/3] imx-drm: parallel-display: Fix dpms mode handling

[Markus Pargmann]

We have to call drm_panel_prepare() and drm_panel_unprepare() when
switching on or off. This patch also replaces the if statement with an
switch statement to only catch ON and OFF modes.

Signed-off-by: Markus Pargmann <mpa at pengutronix.de>
---
 drivers/staging/imx-drm/parallel-display.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/imx-drm/parallel-display.c b/drivers/staging/imx-drm/parallel-display.c
index 0992bbf01adc..62788177c9d4 100644
--- a/drivers/staging/imx-drm/parallel-display.c
+++ b/drivers/staging/imx-drm/parallel-display.c
@@ -106,10 +106,18 @@ static void imx_pd_encoder_dpms(struct drm_encoder *encoder, int mode)
 {
 	struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
 
-	if (mode != DRM_MODE_DPMS_ON)
-		drm_panel_disable(imxpd->panel);
-	else
+	switch (mode) {
+	case DRM_MODE_DPMS_ON:
+		drm_panel_prepare(imxpd->panel);
 		drm_panel_enable(imxpd->panel);
+		break;
+	case DRM_MODE_DPMS_OFF:
+		drm_panel_disable(imxpd->panel);
+		drm_panel_unprepare(imxpd->panel);
+		break;
+	default:
+		break;
+	}
 }
 
 static bool imx_pd_encoder_mode_fixup(struct drm_encoder *encoder,
-- 
2.1.1