feat(core): add support for dem240320b1 display panel

diff --git a/core/embed/io/Cargo.toml b/core/embed/io/Cargo.toml
index 9d7ce64a..58240570 100644
--- a/core/embed/io/Cargo.toml
+++ b/core/embed/io/Cargo.toml
@@ -122,5 +122,6 @@ display_panel_lx250a2401a = []
 display_panel_stm32u5a9j_dk = []
 display_panel_t2t1 = []
 display_panel_lx154a2482 = []
+display_panel_dem240320b1 = []
 display_panel_vg2864 = []
 
diff --git a/core/embed/io/display/build.rs b/core/embed/io/display/build.rs
index 4794085d..57a7ff1b 100644
--- a/core/embed/io/display/build.rs
+++ b/core/embed/io/display/build.rs
@@ -67,6 +67,14 @@ fn set_panel_stm32u5a9j_dk(lib: &mut CLibrary) {
     ]);
 }
 
+fn set_panel_dem240320b1(lib: &mut CLibrary) {
+    lib.add_defines([
+        ("DISPLAY_PANEL_DEM240320B1", Some("1")),
+        ("DISPLAY_RESX", Some("240")),
+        ("DISPLAY_RESY", Some("320")),
+    ]);
+}
+
 fn set_panel_lx154a2482(lib: &mut CLibrary) {
     lib.add_defines([
         ("DISPLAY_PANEL_LX154A2482", Some("1")),
@@ -101,6 +109,8 @@ fn add_driver_unix(lib: &mut CLibrary) -> Result<()> {
         set_panel_stm32u5a9j_dk(lib);
     } else if cfg!(feature = "display_panel_lx154a2482") {
         set_panel_lx154a2482(lib);
+    } else if cfg!(feature = "display_panel_dem240320b1") {
+        set_panel_dem240320b1(lib);
     } else if cfg!(feature = "display_panel_t2t1") {
         set_panel_t2t1(lib);
     } else if cfg!(feature = "display_panel_vg2864") {
@@ -160,6 +170,9 @@ fn add_driver_st7789(lib: &mut CLibrary) -> Result<()> {
         if cfg!(feature = "display_panel_lx154a2482") {
             set_panel_lx154a2482(lib);
             lib.add_source("display/st-7789/panels/lx154a2482.c");
+        } else if cfg!(feature = "display_panel_dem240320b1") {
+            set_panel_dem240320b1(lib);
+            lib.add_source("display/st-7789/panels/dem240320b1.c");
         } else {
             bail_unsupported!();
         }
diff --git a/core/embed/io/display/st-7789/display_panel.c b/core/embed/io/display/st-7789/display_panel.c
index fc7b37f2..0cd1b07f 100644
--- a/core/embed/io/display/st-7789/display_panel.c
+++ b/core/embed/io/display/st-7789/display_panel.c
@@ -32,6 +32,11 @@
 #define PANEL_INIT_SEQ lx154a2482_init_seq
 #define PANEL_ROTATE lx154a2482_rotate
 #define PANEL_REINIT lx154a2482_init_seq
+#elif defined(DISPLAY_PANEL_DEM240320B1)
+#include "panels/dem240320b1.h"
+#define PANEL_INIT_SEQ dem240320b1_init_seq
+#define PANEL_ROTATE dem240320b1_rotate
+#define PANEL_REINIT dem240320b1_init_seq
 #elif defined(DISPLAY_PANEL_LHS200KB_IF21)
 #include "panels/lhs200kb-if21.h"
 #define PANEL_INIT_SEQ lhs200kb_if21_init_seq
diff --git a/core/embed/io/display/st-7789/panels/dem240320b1.c b/core/embed/io/display/st-7789/panels/dem240320b1.c
new file mode 100644
index 00000000..9333b0bb
--- /dev/null
+++ b/core/embed/io/display/st-7789/panels/dem240320b1.c
@@ -0,0 +1,167 @@
+/*
+ * This file is part of the Trezor project, https://trezor.io/
+ *
+ * Copyright (c) SatoshiLabs
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+// Display Elektronik DEM240320B1 VTH-PW
+// 2.0" transflective TFT, 240(RGB)x320, controller ST7789 (COG).
+//
+// NOTE: The module datasheet does not provide a register init table, so the
+// sequence below is based on the (same-controller) lx154a2482 ST7789 panel
+// adapted to the full 240x320 resolution. Gamma / VCOM / porch / inversion
+// values are a reasonable starting point and may need tuning against real
+// hardware.
+
+#include <trezor_model.h>
+
+#include "../display_io.h"
+#include "dem240320b1.h"
+
+void dem240320b1_gamma(void) {
+  // positive voltage correction
+  ISSUE_CMD_BYTE(0xE0);
+  ISSUE_DATA_BYTE(0xD0);
+  ISSUE_DATA_BYTE(0x0A);
+  ISSUE_DATA_BYTE(0x10);
+  ISSUE_DATA_BYTE(0x0A);
+  ISSUE_DATA_BYTE(0x0A);
+  ISSUE_DATA_BYTE(0x26);
+  ISSUE_DATA_BYTE(0x36);
+  ISSUE_DATA_BYTE(0x34);
+  ISSUE_DATA_BYTE(0x4D);
+  ISSUE_DATA_BYTE(0x18);
+  ISSUE_DATA_BYTE(0x13);
+  ISSUE_DATA_BYTE(0x14);
+  ISSUE_DATA_BYTE(0x2F);
+  ISSUE_DATA_BYTE(0x34);
+
+  // negative voltage correction
+  ISSUE_CMD_BYTE(0xE1);
+  ISSUE_DATA_BYTE(0xD0);
+  ISSUE_DATA_BYTE(0x0A);
+  ISSUE_DATA_BYTE(0x10);
+  ISSUE_DATA_BYTE(0x0A);
+  ISSUE_DATA_BYTE(0x09);
+  ISSUE_DATA_BYTE(0x26);
+  ISSUE_DATA_BYTE(0x36);
+  ISSUE_DATA_BYTE(0x53);
+  ISSUE_DATA_BYTE(0x4C);
+  ISSUE_DATA_BYTE(0x18);
+  ISSUE_DATA_BYTE(0x14);
+  ISSUE_DATA_BYTE(0x14);
+  ISSUE_DATA_BYTE(0x2F);
+  ISSUE_DATA_BYTE(0x34);
+}
+
+void dem240320b1_init_seq(void) {
+  // Memory Data Access Control (MADCTL)
+  ISSUE_CMD_BYTE(0x36);
+  ISSUE_DATA_BYTE(0x00);
+
+  // Interface Pixel Format: 16 bits/pixel (RGB565)
+  ISSUE_CMD_BYTE(0x3A);
+  ISSUE_DATA_BYTE(0x05);
+
+  // Column Address Set: 0 .. 239
+  ISSUE_CMD_BYTE(0x2A);
+  ISSUE_DATA_BYTE(0x00);
+  ISSUE_DATA_BYTE(0x00);
+  ISSUE_DATA_BYTE(0x00);
+  ISSUE_DATA_BYTE(0xEF);
+
+  // Row Address Set: 0 .. 319
+  ISSUE_CMD_BYTE(0x2B);
+  ISSUE_DATA_BYTE(0x00);
+  ISSUE_DATA_BYTE(0x00);
+  ISSUE_DATA_BYTE(0x01);
+  ISSUE_DATA_BYTE(0x3F);
+
+  //  Porch Setting
+  ISSUE_CMD_BYTE(0xB2);
+  ISSUE_DATA_BYTE(0x0C);
+  ISSUE_DATA_BYTE(0x0C);
+  ISSUE_DATA_BYTE(0x00);
+  ISSUE_DATA_BYTE(0x33);
+  ISSUE_DATA_BYTE(0x33);
+
+  // VCOM Setting
+  ISSUE_CMD_BYTE(0xBB);
+  ISSUE_DATA_BYTE(0x1F);
+
+  // LCMCTRL: LCM Control: XOR RGB setting
+  ISSUE_CMD_BYTE(0xC0);
+  ISSUE_DATA_BYTE(0x20);
+
+  // VDV and VRH Command Enable
+  ISSUE_CMD_BYTE(0xC2);
+  ISSUE_DATA_BYTE(0x01);
+
+  // VRH Set
+  ISSUE_CMD_BYTE(0xC3);
+  ISSUE_DATA_BYTE(0x0F);  // 4.3V
+
+  // VDV Setting
+  ISSUE_CMD_BYTE(0xC4);
+  ISSUE_DATA_BYTE(0x20);
+
+  // Frame Rate Control in Normal Mode
+  ISSUE_CMD_BYTE(0xC6);
+  ISSUE_DATA_BYTE(0xEF);  // column inversion
+
+  // INVON (21h): Display Inversion On (panel is normally black)
+  ISSUE_CMD_BYTE(0x21);
+
+  // PWCTRL1: Power Control 1
+  ISSUE_CMD_BYTE(0xD0);
+  ISSUE_DATA_BYTE(0xA4);
+  ISSUE_DATA_BYTE(0xA1);
+
+  dem240320b1_gamma();
+}
+
+void dem240320b1_rotate(int degrees, display_padding_t* padding) {
+#define RGB (1 << 3)
+#define ML (1 << 4)  // vertical refresh order
+#define MH (1 << 2)  // horizontal refresh order
+#define MV (1 << 5)
+#define MX (1 << 6)
+#define MY (1 << 7)
+  // MADCTL: Memory Data Access Control - reference:
+  // section 8.12 in the ST7789V manual
+  uint8_t display_command_parameter = 0;
+  switch (degrees) {
+    case 0:
+      display_command_parameter = 0;
+      break;
+    case 90:
+      display_command_parameter = MV | MX;
+      break;
+    case 180:
+      display_command_parameter = MX | MY;
+      break;
+    case 270:
+      display_command_parameter = MV | MY;
+      break;
+  }
+
+  ISSUE_CMD_BYTE(0x36);
+  ISSUE_DATA_BYTE(display_command_parameter);
+
+  // Full 240x320 panel - no window offset in any orientation.
+  padding->x = 0;
+  padding->y = 0;
+}
diff --git a/core/embed/io/display/st-7789/panels/dem240320b1.h b/core/embed/io/display/st-7789/panels/dem240320b1.h
new file mode 100644
index 00000000..d1baafc2
--- /dev/null
+++ b/core/embed/io/display/st-7789/panels/dem240320b1.h
@@ -0,0 +1,29 @@
+/*
+ * This file is part of the Trezor project, https://trezor.io/
+ *
+ * Copyright (c) SatoshiLabs
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef DEM240320B1_H_
+#define DEM240320B1_H_
+
+#include "../display_panel.h"
+
+void dem240320b1_init_seq(void);
+void dem240320b1_gamma(void);
+void dem240320b1_rotate(int degrees, display_padding_t* padding);
+
+#endif