drm: introduce hybrid DC dimming

need to check Disable Hardware Overlays in developer options. Signed-off-by: DevriesL <therkduan@gmail.com>
DevriesL · Oct 27, 2019 · 3932208 · 3932208
1 parent 1a2308f
commit 3932208
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Showing 4 changed files with 31 additions and 1 deletion.
diff --git a/drivers/gpu/drm/msm/Kconfig b/drivers/gpu/drm/msm/Kconfig
@@ -204,3 +204,11 @@ config EXPOSURE_ADJUSTMENT
 	help
           The EXPOSURE ADJUSTMENT provides exposure adjustment function without change
           panel hardware brightness to avoid PWM flicker on OLED devices.
+
+config HYBRID_DC_DIMMING
+	depends on DRM_MSM
+	depends on EXPOSURE_ADJUSTMENT
+	bool "FORCED HYBRID DC DIMMING"
+	default n
+	help
+          Forced dc dimming mode by hijack panel gamma and SDE.
diff --git a/drivers/gpu/drm/msm/samsung/ss_dsi_panel_common.c b/drivers/gpu/drm/msm/samsung/ss_dsi_panel_common.c
@@ -26,6 +26,9 @@ Copyright (C) 2015, Samsung Electronics. All rights reserved.
  */
 
 #include "ss_dsi_panel_common.h"
+#ifdef CONFIG_HYBRID_DC_DIMMING
+#include "exposure_adjustment.h"
+#endif
 
 static void ss_panel_recovery(struct samsung_display_driver_data *vdd);
 static void ss_event_osc_te_fitting(
@@ -4538,6 +4541,9 @@ int ss_brightness_dcs(struct samsung_display_driver_data *vdd, int level)
 	int need_lpm_lock = 0;
 	struct dsi_panel_cmd_set *brightness_cmds = NULL;
 	struct dsi_panel *panel = GET_DSI_PANEL(vdd);
+#ifdef CONFIG_HYBRID_DC_DIMMING
+	struct dsi_display *display = GET_DSI_DISPLAY(vdd);
+#endif
 
 	/* FC2 change: set panle mode in SurfaceFlinger initialization, instead of kenrel booting... */
 	if (!panel->cur_mode) {
@@ -4604,6 +4610,9 @@ int ss_brightness_dcs(struct samsung_display_driver_data *vdd, int level)
 	}
 
 	if (cmd_cnt) {
+#ifdef CONFIG_HYBRID_DC_DIMMING
+	ea_panel_calc_backlight(display, vdd->br.cd_level);
+#endif
 		/* setting tx cmds cmt */
 		brightness_cmds = ss_get_cmds(vdd, TX_BRIGHT_CTRL);
 		brightness_cmds->count = cmd_cnt;

diff --git a/drivers/gpu/drm/msm/samsung/ss_interpolation_common.c b/drivers/gpu/drm/msm/samsung/ss_interpolation_common.c
@@ -784,6 +784,11 @@ static int find_normal_candela(struct samsung_display_driver_data *vdd)
 	if (index < 0) {
 		LCD_INFO("fail to find %d candela at normal.candela_table\n", candela);
 	}
+#ifdef CONFIG_HYBRID_DC_DIMMING
+	if (index > GAMMA_VOLTAGE_THRESHOLD) {
+		index = GAMMA_VOLTAGE_THRESHOLD;
+	}
+#endif
 
 	return index;
 }
@@ -902,7 +907,12 @@ int br_interpolation_generate_event(struct samsung_display_driver_data *vdd, enu
 			memcpy(buf, vdd->panel_br_info.hmd.aor[candela_index], aor_size);
 		break;
 	case GEN_NORMAL_INTERPOLATION_AOR:
-		memcpy(buf, ss_itp->normal.br_aor_table[vdd->br.pac_cd_idx].aor_hex_string, aor_size);
+#ifdef CONFIG_HYBRID_DC_DIMMING
+		if (vdd->br.pac_cd_idx < AOR_DISABLE_THRESHOLD)
+			memcpy(buf, ss_itp->normal.br_aor_table[AOR_DISABLE_THRESHOLD].aor_hex_string, aor_size);
+		else
+#endif
+			memcpy(buf, ss_itp->normal.br_aor_table[vdd->br.pac_cd_idx].aor_hex_string, aor_size);
 		vdd->br.aor_data = ss_itp->normal.br_aor_table[vdd->br.pac_cd_idx].aor_percent_x10000 / 100;
 		break;
 	case GEN_HBM_INTERPOLATION_AOR:

diff --git a/drivers/gpu/drm/msm/samsung/ss_interpolation_common.h b/drivers/gpu/drm/msm/samsung/ss_interpolation_common.h
@@ -31,6 +31,9 @@ Copyright (C) 2012, Samsung Electronics. All rights reserved.
 
 #define AOR_HEX_STRING_CNT (sizeof(unsigned int))
 
+#define AOR_DISABLE_THRESHOLD 499
+#define GAMMA_VOLTAGE_THRESHOLD 40
+
 #define V255_START (1)
 #define V0_VT_BYTE (3)