linux-kernel - [PATCH 5/7] drm/bridge: tc358768: Add LP mode command support

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Message-Id: <20251021-tc358768-v1-5-d590dc6a1a0c@ideasonboard.com>
Date: Tue, 21 Oct 2025 16:23:01 +0300
From: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
To: 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>, Simona Vetter <simona@...ll.ch>, 
 Parth Pancholi <parth.pancholi@...adex.com>, 
 Francesco Dolcini <francesco.dolcini@...adex.com>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Subject: [PATCH 5/7] drm/bridge: tc358768: Add LP mode command support

Currently the driver ignores MIPI_DSI_MODE_LPM and always uses HS mode.
Add code to enable HS mode in pre_enable() only if MIPI_DSI_MODE_LPM is
not set, and always enable HS mode in enable() for video transmission.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
---
 drivers/gpu/drm/bridge/tc358768.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/tc358768.c b/drivers/gpu/drm/bridge/tc358768.c
index a276fbc75dde..a7a14c125ac4 100644
--- a/drivers/gpu/drm/bridge/tc358768.c
+++ b/drivers/gpu/drm/bridge/tc358768.c
@@ -1091,7 +1091,8 @@ static void tc358768_bridge_atomic_pre_enable(struct drm_bridge *bridge,
 	/* Configure DSI_Control register */
 	val = (dsi_dev->lanes - 1) << 1;
 
-	val |= TC358768_DSI_CONTROL_TXMD;
+	if (!(dsi_dev->mode_flags & MIPI_DSI_MODE_LPM))
+		val |= TC358768_DSI_CONTROL_TXMD;
 
 	if (!(dsi_dev->mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS))
 		val |= TC358768_DSI_CONTROL_HSCKMD;
@@ -1123,6 +1124,11 @@ static void tc358768_bridge_atomic_enable(struct drm_bridge *bridge,
 		return;
 	}
 
+	/* Enable HS mode for video TX */
+	tc358768_confw_update_bits(priv, TC358768_DSI_CONTROL,
+				   TC358768_DSI_CONTROL_TXMD,
+				   TC358768_DSI_CONTROL_TXMD);
+
 	/* clear FrmStop and RstPtr */
 	tc358768_update_bits(priv, TC358768_PP_MISC, 0x3 << 14, 0);
 

-- 
2.43.0