linux-kernel - [PATCH 11/12] drm/panel: sofef00: Mark the LPM mode always-on

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Message-Id: <20251104-sofef00-rebuild-v1-11-dfcfa17eb176@ixit.cz>
Date: Tue, 04 Nov 2025 23:16:19 +0100
From: David Heidelberg via B4 Relay <devnull+david.ixit.cz@...nel.org>
To: Neil Armstrong <neil.armstrong@...aro.org>, 
 Jessica Zhang <jessica.zhang@....qualcomm.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>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Thierry Reding <thierry.reding@...il.com>, Sam Ravnborg <sam@...nborg.org>, 
 Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konradybcio@...nel.org>, 
 Casey Connolly <casey.connolly@...aro.org>
Cc: dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org, 
 phone-devel@...r.kernel.org, David Heidelberg <david@...t.cz>
Subject: [PATCH 11/12] drm/panel: sofef00: Mark the LPM mode always-on

From: David Heidelberg <david@...t.cz>

The panel operated in low-power mode, with exception of changing the
brightness levels.

Signed-off-by: David Heidelberg <david@...t.cz>
---
 drivers/gpu/drm/panel/panel-samsung-sofef00.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/panel/panel-samsung-sofef00.c b/drivers/gpu/drm/panel/panel-samsung-sofef00.c
index e69a28628b656..8286cad385738 100644
--- a/drivers/gpu/drm/panel/panel-samsung-sofef00.c
+++ b/drivers/gpu/drm/panel/panel-samsung-sofef00.c
@@ -92,8 +92,6 @@ static int sofef00_panel_off(struct sofef00_panel *ctx)
 	struct mipi_dsi_device *dsi = ctx->dsi;
 	struct mipi_dsi_multi_context dsi_ctx = { .dsi = dsi };
 
-	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
-
 	mipi_dsi_dcs_set_display_off_multi(&dsi_ctx);
 	mipi_dsi_msleep(&dsi_ctx, 40);
 
@@ -180,10 +178,14 @@ static int sofef00_panel_bl_update_status(struct backlight_device *bl)
 	int err;
 	u16 brightness = (u16)backlight_get_brightness(bl);
 
+	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
+
 	err = mipi_dsi_dcs_set_display_brightness_large(dsi, brightness);
 	if (err < 0)
 		return err;
 
+	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
+
 	return 0;
 }
 
@@ -234,6 +236,7 @@ static int sofef00_panel_probe(struct mipi_dsi_device *dsi)
 
 	dsi->lanes = 4;
 	dsi->format = MIPI_DSI_FMT_RGB888;
+	dsi->mode_flags = MIPI_DSI_MODE_LPM;
 
 	ctx->panel.prepare_prev_first = true;
 

-- 
2.51.0