drm/panel: ilitek-ili9881c: Report subpixel order according to rotation

Assume a default RGB subpixel order and flip it around if 180° rotation
is configured via address mode. Report subpixel order to userspace.

Signed-off-by: Philipp Zabel <[e-mail]>
Reviewed-by: Neil Armstrong <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Neil Armstrong <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/panel/panel-ilitek-ili9881c.c

···
 
 	connector->display_info.width_mm = mode->width_mm;
 	connector->display_info.height_mm = mode->height_mm;
+	if (ctx->address_mode == 0x3)
+		connector->display_info.subpixel_order = SubPixelHorizontalBGR;
+	else
+		connector->display_info.subpixel_order = SubPixelHorizontalRGB;
 
 	/*
 	 * TODO: Remove once all drm drivers call