drm/panel: truly: Add additional delay after pulling down reset gpio

MTP SDM845 panel seems to need additional delay to bring panel
to a workable state. Running modetest without this change displays
blurry artifacts.

Signed-off-by: Vivek Gautam <vivek.gautam@codeaurora.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190527102616.28315-1-vivek.gautam@codeaurora.org

drivers/gpu/drm/panel/panel-truly-nt35597.c

@@ -284,6 +284,7 @@ static int truly_35597_power_on(struct truly_nt35597 *ctx)
 	gpiod_set_value(ctx->reset_gpio, 1);
 	usleep_range(10000, 20000);
 	gpiod_set_value(ctx->reset_gpio, 0);
+	usleep_range(10000, 20000);
 
 	return 0;
 }