linux-kernel - [PATCH 7/7] drm/bridge: cdns-dsi: Implement early_enable and late

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Date: Sat, 11 May 2024 21:00:51 +0530
From: Aradhya Bhatia <a-bhatia1@...com>
To: Tomi Valkeinen <tomi.valkeinen@...asonboard.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>, Jyri
 Sarha <jyri.sarha@....fi>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David
 Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>
CC: DRI Development List <dri-devel@...ts.freedesktop.org>,
        Linux Kernel List
	<linux-kernel@...r.kernel.org>,
        Sam Ravnborg <sam@...nborg.org>, Thierry
 Reding <treding@...dia.com>,
        Kieran Bingham
	<kieran.bingham+renesas@...asonboard.com>,
        Boris Brezillon
	<boris.brezillon@...tlin.com>,
        Nishanth Menon <nm@...com>, Vignesh
 Raghavendra <vigneshr@...com>,
        Praneeth Bajjuri <praneeth@...com>, Udit Kumar
	<u-kumar1@...com>,
        Devarsh Thakkar <devarsht@...com>,
        Jayesh Choudhary
	<j-choudhary@...com>, Jai Luthra <j-luthra@...com>,
        Aradhya Bhatia
	<a-bhatia1@...com>
Subject: [PATCH 7/7] drm/bridge: cdns-dsi: Implement early_enable and late_disable

The cdsn-dsi controller requires that it be turned on completely before
the input DPI's source has begun streaming.

Since tidss's videoport starts streaming via crtc enable hooks, we need
cdns-dsi to be up and running before that. Hence, use the early_enable
and late_disable hooks to get pass the color issues.

Signed-off-by: Aradhya Bhatia <a-bhatia1@...com>
---
 .../gpu/drm/bridge/cadence/cdns-dsi-core.c    | 36 ++++---------------
 1 file changed, 6 insertions(+), 30 deletions(-)

diff --git a/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c b/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c
index c7519d18e94f..53fa20720089 100644
--- a/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c
+++ b/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c
@@ -656,8 +656,8 @@ cdns_dsi_bridge_mode_valid(struct drm_bridge *bridge,
 	return MODE_OK;
 }
 
-static void cdns_dsi_bridge_atomic_disable(struct drm_bridge *bridge,
-					   struct drm_bridge_state *old_bridge_state)
+static void cdns_dsi_bridge_atomic_late_disable(struct drm_bridge *bridge,
+						struct drm_bridge_state *old_bridge_state)
 {
 	struct cdns_dsi_input *input = bridge_to_cdns_dsi_input(bridge);
 	struct cdns_dsi *dsi = input_to_dsi(input);
@@ -677,15 +677,6 @@ static void cdns_dsi_bridge_atomic_disable(struct drm_bridge *bridge,
 	pm_runtime_put(dsi->base.dev);
 }
 
-static void cdns_dsi_bridge_post_disable(struct drm_bridge *bridge,
-					 struct drm_bridge_state *old_bridge_state)
-{
-	struct cdns_dsi_input *input = bridge_to_cdns_dsi_input(bridge);
-	struct cdns_dsi *dsi = input_to_dsi(input);
-
-	pm_runtime_put(dsi->base.dev);
-}
-
 static void cdns_dsi_hs_init(struct cdns_dsi *dsi)
 {
 	struct cdns_dsi_output *output = &dsi->output;
@@ -755,8 +746,8 @@ static void cdns_dsi_init_link(struct cdns_dsi *dsi)
 	dsi->link_initialized = true;
 }
 
-static void cdns_dsi_bridge_atomic_enable(struct drm_bridge *bridge,
-					  struct drm_bridge_state *old_bridge_state)
+static void cdns_dsi_bridge_atomic_early_enable(struct drm_bridge *bridge,
+						struct drm_bridge_state *old_bridge_state)
 {
 	struct cdns_dsi_input *input = bridge_to_cdns_dsi_input(bridge);
 	struct cdns_dsi *dsi = input_to_dsi(input);
@@ -907,19 +898,6 @@ static void cdns_dsi_bridge_atomic_enable(struct drm_bridge *bridge,
 	writel(tmp, dsi->regs + MCTL_MAIN_EN);
 }
 
-static void cdns_dsi_bridge_pre_enable(struct drm_bridge *bridge,
-				       struct drm_bridge_state *old_bridge_state)
-{
-	struct cdns_dsi_input *input = bridge_to_cdns_dsi_input(bridge);
-	struct cdns_dsi *dsi = input_to_dsi(input);
-
-	if (WARN_ON(pm_runtime_get_sync(dsi->base.dev) < 0))
-		return;
-
-	cdns_dsi_init_link(dsi);
-	cdns_dsi_hs_init(dsi);
-}
-
 static u32 *cdns_dsi_bridge_get_input_bus_fmts(struct drm_bridge *bridge,
 					       struct drm_bridge_state *bridge_state,
 					       struct drm_crtc_state *crtc_state,
@@ -968,10 +946,8 @@ static u32 *cdns_dsi_bridge_get_input_bus_fmts(struct drm_bridge *bridge,
 static const struct drm_bridge_funcs cdns_dsi_bridge_funcs = {
 	.attach = cdns_dsi_bridge_attach,
 	.mode_valid = cdns_dsi_bridge_mode_valid,
-	.atomic_disable = cdns_dsi_bridge_atomic_disable,
-	.atomic_pre_enable = cdns_dsi_bridge_atomic_pre_enable,
-	.atomic_enable = cdns_dsi_bridge_atomic_enable,
-	.atomic_post_disable = cdns_dsi_bridge_atomic_post_disable,
+	.atomic_early_enable = cdns_dsi_bridge_atomic_early_enable,
+	.atomic_late_disable = cdns_dsi_bridge_atomic_late_disable,
 	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
 	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
 	.atomic_reset = drm_atomic_helper_bridge_reset,
-- 
2.34.1