linux-kernel - [PATCH 2/2] drm/panel: ilitek-ili9881c: Report subpixel order according to rotation

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Message-Id: <20240626-drm-panel-ili9881c-rotation-v1-2-e0ff54173e32@pengutronix.de>
Date: Wed, 26 Jun 2024 16:40:39 +0200
From: Philipp Zabel <p.zabel@...gutronix.de>
To: Neil Armstrong <neil.armstrong@...aro.org>, 
 Jessica Zhang <quic_jesszhan@...cinc.com>, Sam Ravnborg <sam@...nborg.org>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 kernel@...gutronix.de, Philipp Zabel <p.zabel@...gutronix.de>
Subject: [PATCH 2/2] 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 <p.zabel@...gutronix.de>
---
 drivers/gpu/drm/panel/panel-ilitek-ili9881c.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/panel/panel-ilitek-ili9881c.c b/drivers/gpu/drm/panel/panel-ilitek-ili9881c.c
index b4565ff1a0de..28cd7560e5db 100644
--- a/drivers/gpu/drm/panel/panel-ilitek-ili9881c.c
+++ b/drivers/gpu/drm/panel/panel-ilitek-ili9881c.c
@@ -1471,6 +1471,10 @@ static int ili9881c_get_modes(struct drm_panel *panel,
 
 	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

-- 
2.39.2