linux-kernel - [PATCH 3/5] drm/panel: mantix: Improve power off sequence

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Message-Id: <20260105-mantix-halo-fixes-v1-3-1ebc9b195a34@puri.sm>
Date: Mon, 05 Jan 2026 21:24:42 +0100
From: Sebastian Krzyszkowiak via B4 Relay <devnull+sebastian.krzyszkowiak.puri.sm@...nel.org>
To: Guido Günther <agx@...xcpu.org>, 
 Purism Kernel Team <kernel@...i.sm>, 
 Neil Armstrong <neil.armstrong@...aro.org>, 
 Jessica Zhang <jesszhan0024@...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: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 Sebastian Krzyszkowiak <sebastian.krzyszkowiak@...i.sm>
Subject: [PATCH 3/5] drm/panel: mantix: Improve power off sequence

From: Sebastian Krzyszkowiak <sebastian.krzyszkowiak@...i.sm>

According to the sequence from section 7.3.4 of FT8006P datasheet,
TP_RSTN and RESX should be asserted after disabling AVDD and AVEE and
together with VDDI.

Also, AVEE power down needs to happen at least 150ms after entering
sleep mode.

Signed-off-by: Sebastian Krzyszkowiak <sebastian.krzyszkowiak@...i.sm>
---
 drivers/gpu/drm/panel/panel-mantix-mlaf057we51.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/panel/panel-mantix-mlaf057we51.c b/drivers/gpu/drm/panel/panel-mantix-mlaf057we51.c
index bb5489e4d7a9..0e66ee7a727d 100644
--- a/drivers/gpu/drm/panel/panel-mantix-mlaf057we51.c
+++ b/drivers/gpu/drm/panel/panel-mantix-mlaf057we51.c
@@ -96,6 +96,9 @@ static int mantix_disable(struct drm_panel *panel)
 	mipi_dsi_dcs_set_display_off_multi(&dsi_ctx);
 	mipi_dsi_dcs_enter_sleep_mode_multi(&dsi_ctx);
 
+	/* T10 */
+	mipi_dsi_msleep(&dsi_ctx, 150);
+
 	return dsi_ctx.accum_err;
 }
 
@@ -103,15 +106,16 @@ static int mantix_unprepare(struct drm_panel *panel)
 {
 	struct mantix *ctx = panel_to_mantix(panel);
 
-	gpiod_set_value_cansleep(ctx->tp_rstn_gpio, 1);
-	usleep_range(5000, 6000);
-	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
-
 	regulator_disable(ctx->avee);
 	regulator_disable(ctx->avdd);
 	/* T11 */
 	usleep_range(5000, 6000);
 	regulator_disable(ctx->vddi);
+
+	gpiod_set_value_cansleep(ctx->tp_rstn_gpio, 1);
+	usleep_range(5000, 6000);
+	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+
 	/* T14 */
 	msleep(50);
 

-- 
2.52.0