drm/panel: ili9882t: Avoid blurred screen from fast sleep

At present, we have found that there may be a problem of blurred
screen during fast sleep/resume. The direct cause of the blurred
screen is that the IC does not receive 0x28/0x10. Because of the
particularity of the IC, before the panel enters sleep hid must
stop scanning, as i2c_hid_core_suspend before ili9882t_disable.
If move the ili9882t_enter_sleep_mode function to ili9882t_unprepare,
touch reset will pull low before panel entersleep, which does not meet
the timing requirements.. So in order to solve this problem, the IC
can handle it through the exception mechanism when it cannot receive
0x28/0x10 command. Handling exceptions requires a reset 50ms delay.
Refer to vendor detailed analysis [1].

Ilitek vendor also suggested switching the page before entering sleep to
avoid panel IC not receiving 0x28/0x10 command.

Note: 0x28 is display off, 0x10 is sleep in.

[1]: https://github.com/ILITEK-LoganLin/Document/tree/main/ILITEK_Power_SequenceSigned-off-by: Cong Yang <yangcong5@huaqin.corp-partner.google.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20231013091844.804310-3-yangcong5@huaqin.corp-partner.google.com

drivers/gpu/drm/panel/panel-ilitek-ili9882t.c

@@ -463,6 +463,24 @@ static int ili9882t_init_dcs_cmd(struct ili9882t *ili)
 	return 0;
 }
 
+static int ili9882t_switch_page(struct mipi_dsi_device *dsi, u8 page)
+{
+	int ret;
+	const struct panel_init_cmd cmd = _INIT_SWITCH_PAGE_CMD(page);
+
+	ret = mipi_dsi_dcs_write(dsi, cmd.data[0],
+				 cmd.len <= 1 ? NULL :
+				 &cmd.data[1],
+				 cmd.len - 1);
+	if (ret) {
+		dev_err(&dsi->dev,
+			"error switching panel controller page (%d)\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
 static int ili9882t_enter_sleep_mode(struct ili9882t *ili)
 {
 	struct mipi_dsi_device *dsi = ili->dsi;
@@ -484,8 +502,10 @@ static int ili9882t_enter_sleep_mode(struct ili9882t *ili)
 static int ili9882t_disable(struct drm_panel *panel)
 {
 	struct ili9882t *ili = to_ili9882t(panel);
+	struct mipi_dsi_device *dsi = ili->dsi;
 	int ret;
 
+	ili9882t_switch_page(dsi, 0x00);
 	ret = ili9882t_enter_sleep_mode(ili);
 	if (ret < 0) {
 		dev_err(panel->dev, "failed to set panel off: %d\n", ret);
@@ -546,7 +566,7 @@ static int ili9882t_prepare(struct drm_panel *panel)
 	gpiod_set_value(ili->enable_gpio, 1);
 	usleep_range(1000, 2000);
 	gpiod_set_value(ili->enable_gpio, 0);
-	usleep_range(1000, 2000);
+	msleep(50);
 	gpiod_set_value(ili->enable_gpio, 1);
 	usleep_range(6000, 10000);