linux-kernel - [PATCH 1/1] drm/bridge: ti-sn65dsi83: Support negative DE polarity

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Message-ID: <20250225135114.801884-1-alexander.stein@ew.tq-group.com>
Date: Tue, 25 Feb 2025 14:51:13 +0100
From: Alexander Stein <alexander.stein@...tq-group.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>
Cc: Alexander Stein <alexander.stein@...tq-group.com>,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	Herve Codina <herve.codina@...tlin.com>
Subject: [PATCH 1/1] drm/bridge: ti-sn65dsi83: Support negative DE polarity

Polarity for DE is stored in bridge state. Use this flag for setting
the DE polarity in the bridge.

Signed-off-by: Alexander Stein <alexander.stein@...tq-group.com>
---
 drivers/gpu/drm/bridge/ti-sn65dsi83.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi83.c b/drivers/gpu/drm/bridge/ti-sn65dsi83.c
index 54ad462d17ef7..95563aa1b450d 100644
--- a/drivers/gpu/drm/bridge/ti-sn65dsi83.c
+++ b/drivers/gpu/drm/bridge/ti-sn65dsi83.c
@@ -561,6 +561,8 @@ static void sn65dsi83_atomic_pre_enable(struct drm_bridge *bridge,
 	       REG_LVDS_FMT_HS_NEG_POLARITY : 0) |
 	      (mode->flags & DRM_MODE_FLAG_NVSYNC ?
 	       REG_LVDS_FMT_VS_NEG_POLARITY : 0);
+	val |= bridge_state->output_bus_cfg.flags & DRM_BUS_FLAG_DE_LOW ?
+	       REG_LVDS_FMT_DE_NEG_POLARITY : 0;
 
 	/* Set up bits-per-pixel, 18bpp or 24bpp. */
 	if (lvds_format_24bpp) {
-- 
2.43.0