[PATCH v2] Revert "drm/msm/dsi: move DSI host powerup to modeset time"

[Douglas Anderson <dianders@chromium.org>]

This reverts commit 7d8e9a90509f1bd1d193a0c93cb8d1dbad9049fb.

The patch causes sc7180 Chromebooks that use the parade-ps8640 bridge
chip to fail to turn the display back on after it turns off.

Let's revert to get these devices back to a working state. It seems
like the DSI powerup problem is somewhat common and probably we should
land something more general like Dave Stevenson's series [1] that
would give more flexibility.

[1] https://lore.kernel.org/r/cover.1646406653.git.dave.stevenson@raspberrypi.com

Fixes: 7d8e9a90509f ("drm/msm/dsi: move DSI host powerup to modeset time")
Signed-off-by: Douglas Anderson <dianders@chromium.org>
---

Changes in v2:
- Remove the mud from my face.

 drivers/gpu/drm/msm/dsi/dsi_manager.c | 43 ++++++++-------------------
 1 file changed, 12 insertions(+), 31 deletions(-)

diff --git a/drivers/gpu/drm/msm/dsi/dsi_manager.c b/drivers/gpu/drm/msm/dsi/dsi_manager.c
index 50b987658b1f..8d51711a3417 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_manager.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_manager.c
@@ -315,12 +315,13 @@ dsi_mgr_connector_best_encoder(struct drm_connector *connector)
 	return msm_dsi_get_encoder(msm_dsi);
 }
 
-static void dsi_mgr_bridge_power_on(struct drm_bridge *bridge)
+static void dsi_mgr_bridge_pre_enable(struct drm_bridge *bridge)
 {
 	int id = dsi_mgr_bridge_get_id(bridge);
 	struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
 	struct msm_dsi *msm_dsi1 = dsi_mgr_get_dsi(DSI_1);
 	struct mipi_dsi_host *host = msm_dsi->host;
+	struct drm_panel *panel = msm_dsi->panel;
 	struct msm_dsi_phy_shared_timings phy_shared_timings[DSI_MAX];
 	bool is_bonded_dsi = IS_BONDED_DSI();
 	int ret;
@@ -361,34 +362,6 @@ static void dsi_mgr_bridge_power_on(struct drm_bridge *bridge)
 	if (is_bonded_dsi && msm_dsi1)
 		msm_dsi_host_enable_irq(msm_dsi1->host);
 
-	return;
-
-host1_on_fail:
-	msm_dsi_host_power_off(host);
-host_on_fail:
-	dsi_mgr_phy_disable(id);
-phy_en_fail:
-	return;
-}
-
-static void dsi_mgr_bridge_pre_enable(struct drm_bridge *bridge)
-{
-	int id = dsi_mgr_bridge_get_id(bridge);
-	struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
-	struct msm_dsi *msm_dsi1 = dsi_mgr_get_dsi(DSI_1);
-	struct mipi_dsi_host *host = msm_dsi->host;
-	struct drm_panel *panel = msm_dsi->panel;
-	bool is_bonded_dsi = IS_BONDED_DSI();
-	int ret;
-
-	DBG("id=%d", id);
-	if (!msm_dsi_device_connected(msm_dsi))
-		return;
-
-	/* Do nothing with the host if it is slave-DSI in case of bonded DSI */
-	if (is_bonded_dsi && !IS_MASTER_DSI_LINK(id))
-		return;
-
 	/* Always call panel functions once, because even for dual panels,
 	 * there is only one drm_panel instance.
 	 */
@@ -423,7 +396,17 @@ static void dsi_mgr_bridge_pre_enable(struct drm_bridge *bridge)
 	if (panel)
 		drm_panel_unprepare(panel);
 panel_prep_fail:
+	msm_dsi_host_disable_irq(host);
+	if (is_bonded_dsi && msm_dsi1)
+		msm_dsi_host_disable_irq(msm_dsi1->host);
 
+	if (is_bonded_dsi && msm_dsi1)
+		msm_dsi_host_power_off(msm_dsi1->host);
+host1_on_fail:
+	msm_dsi_host_power_off(host);
+host_on_fail:
+	dsi_mgr_phy_disable(id);
+phy_en_fail:
 	return;
 }
 
@@ -569,8 +552,6 @@ static void dsi_mgr_bridge_mode_set(struct drm_bridge *bridge,
 	msm_dsi_host_set_display_mode(host, adjusted_mode);
 	if (is_bonded_dsi && other_dsi)
 		msm_dsi_host_set_display_mode(other_dsi->host, adjusted_mode);
-
-	dsi_mgr_bridge_power_on(bridge);
 }
 
 static enum drm_mode_status dsi_mgr_bridge_mode_valid(struct drm_bridge *bridge,
-- 
2.36.0.550.gb090851708-goog