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[02/20] drm/mediatek: dsi: provide LP-11 mode during .pre_enable

Message ID 20240506-tc358775-fix-powerup-v1-2-545dcf00b8dd@kernel.org (mailing list archive)
State New, archived
Headers show
Series drm/bridge: tc358775: proper bridge bringup and code cleanup | expand

Commit Message

Michael Walle May 6, 2024, 1:34 p.m. UTC 
As per specification in drivers/gpu/drm/drm_bridge.c the data lanes
should be in LP-11 mode after .pre_enable() has been run. HS mode of the
data lanes are enabled with mtk_dsi_start(). Therefore, move that call
to the .enable() callback.

Signed-off-by: Michael Walle <mwalle@kernel.org>
---
 drivers/gpu/drm/mediatek/mtk_dsi.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)
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Patch

diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
index c255559cc56e..ed45c9cc3137 100644
--- a/drivers/gpu/drm/mediatek/mtk_dsi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
@@ -711,8 +711,6 @@  static void mtk_output_dsi_enable(struct mtk_dsi *dsi)
 	mtk_dsi_set_mode(dsi);
 	mtk_dsi_clk_hs_mode(dsi, 1);
 
-	mtk_dsi_start(dsi);
-
 	dsi->enabled = true;
 }
 
@@ -759,7 +757,7 @@  static void mtk_dsi_bridge_atomic_enable(struct drm_bridge *bridge,
 	if (dsi->refcount == 0)
 		return;
 
-	mtk_output_dsi_enable(dsi);
+	mtk_dsi_start(dsi);
 }
 
 static void mtk_dsi_bridge_atomic_pre_enable(struct drm_bridge *bridge,
@@ -771,6 +769,9 @@  static void mtk_dsi_bridge_atomic_pre_enable(struct drm_bridge *bridge,
 	ret = mtk_dsi_poweron(dsi);
 	if (ret < 0)
 		DRM_ERROR("failed to power on dsi\n");
+
+	/* Enter LP-11 state */
+	mtk_output_dsi_enable(dsi);
 }
 
 static void mtk_dsi_bridge_atomic_post_disable(struct drm_bridge *bridge,