[PATCH v2 1/2] drm/panel: jd9365da: Move the location of "exit sleep mode" and "set display on" commands

[Zhaoxiong Lv]

Move the "exit sleep mode" and "set display on" command from
enable() to init() function.

As mentioned in the patch:
https://lore.kernel.org/all/20240624141926.5250-2-lvzhaoxiong@huaqin.corp-partner.google.com/

Our DSI host has different modes in prepare() and enable()
functions. prepare() is in LP mode and enable() is in HS mode.
Since the "exit sleep mode" and "set display on" command must
also be sent in LP mode, so we also move "exit sleep mode" and
"set display on" command to the init() function.

We have no other actions in the enable() function after moves
"exit sleep mode" and "set display on", and we checked the call
of the enable() function during the "startup" process. It seems
that only one judgment was made in drm_panel_enabel(). If the
panel does not define enable(), the judgment will skip the 
enable() and continue execution. This does not seem to have 
any other effects,and we found that some drivers also seem 
to have no enable() function added, for example:
panel-asus-z00t-tm5p5-n35596 / panel-boe-himax8279d ...
In addition, we briefly tested the kingdisplay_kd101ne3 panel and
melfas_lmfbx101117480 panel, and it seems that there is no garbage
on the panel, so we delete enable() function.

After moving the "exit sleep mode" and "set display on" command
to the init() function, we no longer need additional delay
judgment, so we deletevariables "exit_sleep_to_display_on_delay_ms"
and "display_on_delay_ms".

Signed-off-by: Zhaoxiong Lv <lvzhaoxiong at huaqin.corp-partner.google.com>
---
Changes between V2 and V1:
-  1. The code has not changed, Modify the commit information.
v1: https://lore.kernel.org/all/20240725083245.12253-2-lvzhaoxiong@huaqin.corp-partner.google.com/
---
 .../gpu/drm/panel/panel-jadard-jd9365da-h3.c  | 59 ++++++++++---------
 1 file changed, 32 insertions(+), 27 deletions(-)

diff --git a/drivers/gpu/drm/panel/panel-jadard-jd9365da-h3.c b/drivers/gpu/drm/panel/panel-jadard-jd9365da-h3.c
index 04d315d96bff..ce73e8cb1db5 100644
--- a/drivers/gpu/drm/panel/panel-jadard-jd9365da-h3.c
+++ b/drivers/gpu/drm/panel/panel-jadard-jd9365da-h3.c
@@ -31,8 +31,6 @@ struct jadard_panel_desc {
 	bool reset_before_power_off_vcioo;
 	unsigned int vcioo_to_lp11_delay_ms;
 	unsigned int lp11_to_reset_delay_ms;
-	unsigned int exit_sleep_to_display_on_delay_ms;
-	unsigned int display_on_delay_ms;
 	unsigned int backlight_off_to_display_off_delay_ms;
 	unsigned int display_off_to_enter_sleep_delay_ms;
 	unsigned int enter_sleep_to_reset_down_delay_ms;
@@ -66,26 +64,6 @@ static inline struct jadard *panel_to_jadard(struct drm_panel *panel)
 	return container_of(panel, struct jadard, panel);
 }
 
-static int jadard_enable(struct drm_panel *panel)
-{
-	struct jadard *jadard = panel_to_jadard(panel);
-	struct mipi_dsi_multi_context dsi_ctx = { .dsi = jadard->dsi };
-
-	msleep(120);
-
-	mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx);
-
-	if (jadard->desc->exit_sleep_to_display_on_delay_ms)
-		mipi_dsi_msleep(&dsi_ctx, jadard->desc->exit_sleep_to_display_on_delay_ms);
-
-	mipi_dsi_dcs_set_display_on_multi(&dsi_ctx);
-
-	if (jadard->desc->display_on_delay_ms)
-		mipi_dsi_msleep(&dsi_ctx, jadard->desc->display_on_delay_ms);
-
-	return dsi_ctx.accum_err;
-}
-
 static int jadard_disable(struct drm_panel *panel)
 {
 	struct jadard *jadard = panel_to_jadard(panel);
@@ -202,7 +180,6 @@ static const struct drm_panel_funcs jadard_funcs = {
 	.disable = jadard_disable,
 	.unprepare = jadard_unprepare,
 	.prepare = jadard_prepare,
-	.enable = jadard_enable,
 	.get_modes = jadard_get_modes,
 	.get_orientation = jadard_panel_get_orientation,
 };
@@ -382,6 +359,12 @@ static int radxa_display_8hd_ad002_init_cmds(struct jadard *jadard)
 
 	jd9365da_switch_page(&dsi_ctx, 0x00);
 
+	mipi_dsi_msleep(&dsi_ctx, 120);
+
+	mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx);
+
+	mipi_dsi_dcs_set_display_on_multi(&dsi_ctx);
+
 	return dsi_ctx.accum_err;
 };
 
@@ -608,6 +591,12 @@ static int cz101b4001_init_cmds(struct jadard *jadard)
 	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xE6, 0x02);
 	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xE7, 0x0C);
 
+	mipi_dsi_msleep(&dsi_ctx, 120);
+
+	mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx);
+
+	mipi_dsi_dcs_set_display_on_multi(&dsi_ctx);
+
 	return dsi_ctx.accum_err;
 };
 
@@ -831,6 +820,16 @@ static int kingdisplay_kd101ne3_init_cmds(struct jadard *jadard)
 
 	jd9365da_switch_page(&dsi_ctx, 0x00);
 
+	mipi_dsi_msleep(&dsi_ctx, 120);
+
+	mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx);
+
+	mipi_dsi_msleep(&dsi_ctx, 120);
+
+	mipi_dsi_dcs_set_display_on_multi(&dsi_ctx);
+
+	mipi_dsi_msleep(&dsi_ctx, 20);
+
 	return dsi_ctx.accum_err;
 };
 
@@ -859,8 +858,6 @@ static const struct jadard_panel_desc kingdisplay_kd101ne3_40ti_desc = {
 	.reset_before_power_off_vcioo = true,
 	.vcioo_to_lp11_delay_ms = 5,
 	.lp11_to_reset_delay_ms = 10,
-	.exit_sleep_to_display_on_delay_ms = 120,
-	.display_on_delay_ms = 20,
 	.backlight_off_to_display_off_delay_ms = 100,
 	.display_off_to_enter_sleep_delay_ms = 50,
 	.enter_sleep_to_reset_down_delay_ms = 100,
@@ -1074,6 +1071,16 @@ static int melfas_lmfbx101117480_init_cmds(struct jadard *jadard)
 	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xe6, 0x02);
 	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xe7, 0x06);
 
+	mipi_dsi_msleep(&dsi_ctx, 120);
+
+	mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx);
+
+	mipi_dsi_msleep(&dsi_ctx, 120);
+
+	mipi_dsi_dcs_set_display_on_multi(&dsi_ctx);
+
+	mipi_dsi_msleep(&dsi_ctx, 20);
+
 	return dsi_ctx.accum_err;
 };
 
@@ -1102,8 +1109,6 @@ static const struct jadard_panel_desc melfas_lmfbx101117480_desc = {
 	.reset_before_power_off_vcioo = true,
 	.vcioo_to_lp11_delay_ms = 5,
 	.lp11_to_reset_delay_ms = 10,
-	.exit_sleep_to_display_on_delay_ms = 120,
-	.display_on_delay_ms = 20,
 	.backlight_off_to_display_off_delay_ms = 100,
 	.display_off_to_enter_sleep_delay_ms = 50,
 	.enter_sleep_to_reset_down_delay_ms = 100,
-- 
2.17.1