linux-kernel - [RFC PATCH 10/10] drm/msm/dsi: drop (again) the ps8640 workaround

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Date:   Mon, 16 Oct 2023 19:53:55 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Robert Foss <rfoss@...nel.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Douglas Anderson <dianders@...omium.org>,
        Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Jessica Zhang <quic_jesszhan@...cinc.com>
Cc:     Marek Vasut <marex@...x.de>, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        freedreno@...ts.freedesktop.org
Subject: [RFC PATCH 10/10] drm/msm/dsi: drop (again) the ps8640 workaround

Now as the Parade PS8640 driver sets the MIPI_DSI_MANUAL_POWERUP flag,
drop the workaround enforcing the late DSI link powerup in the case the
next bridge is ps8640.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
---
 drivers/gpu/drm/msm/dsi/dsi_manager.c | 20 --------------------
 1 file changed, 20 deletions(-)

diff --git a/drivers/gpu/drm/msm/dsi/dsi_manager.c b/drivers/gpu/drm/msm/dsi/dsi_manager.c
index 2d7040d21239..b6b8171cf382 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_manager.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_manager.c
@@ -198,29 +198,12 @@ static int dsi_mgr_bridge_get_id(struct drm_bridge *bridge)
 	return dsi_bridge->id;
 }
 
-/*
- * If the next bridge in the chain is the Parade ps8640 bridge chip then don't
- * power on early since it seems to violate the expectations of the firmware
- * that the bridge chip is running.
- */
-static bool dsi_mgr_next_is_ps8640(struct drm_bridge *bridge)
-{
-	struct drm_bridge *next_bridge = drm_bridge_get_next_bridge(bridge);
-
-	return next_bridge &&
-		next_bridge->of_node &&
-		of_device_is_compatible(next_bridge->of_node, "parade,ps8640");
-}
-
 static bool dsi_mgr_auto_powerup(struct drm_bridge *bridge)
 {
 	int id = dsi_mgr_bridge_get_id(bridge);
 	struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
 	struct mipi_dsi_host *host = msm_dsi->host;
 
-	if (dsi_mgr_next_is_ps8640(bridge))
-		return true;
-
 	return msm_dsi_host_auto_powerup(host);
 }
 
@@ -230,9 +213,6 @@ static bool dsi_mgr_early_powerup(struct drm_bridge *bridge)
 	struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
 	struct mipi_dsi_host *host = msm_dsi->host;
 
-	if (dsi_mgr_next_is_ps8640(bridge))
-		return false;
-
 	return msm_dsi_host_early_powerup(host);
 }
 
-- 
2.42.0