[PATCH] drm/tegra: DPMS off/on in encoder prepare/commit

[Sean Paul]

Previously the panel and output were only enabled on encoder->dpms(). If
userspace called dpms on before doing a modeset, the driver would get into
a state where the connector had a dpms state of ON, but the encoder and output
were not enabled (because the encoder is not yet attached to the connector).
Subsequent dpms ON calls are ignored b/c the connector's state already matches
the desired state.

This patch enables/disables the panel and output on modeset as well, so we
can catch the above case.

Signed-off-by: Sean Paul <seanpaul at chromium.org>
---
 drivers/gpu/drm/tegra/output.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/tegra/output.c b/drivers/gpu/drm/tegra/output.c
index 0c67d7e..937a0ea 100644
--- a/drivers/gpu/drm/tegra/output.c
+++ b/drivers/gpu/drm/tegra/output.c
@@ -157,10 +157,12 @@ static bool tegra_encoder_mode_fixup(struct drm_encoder *encoder,
 
 static void tegra_encoder_prepare(struct drm_encoder *encoder)
 {
+	tegra_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
 }
 
 static void tegra_encoder_commit(struct drm_encoder *encoder)
 {
+	tegra_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
 }
 
 static void tegra_encoder_mode_set(struct drm_encoder *encoder,
-- 
2.1.1