linux-kernel - [PATCH 3/3] drm/panel: ilitek-ili9881c: Read panel orientation

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Date:   Wed, 20 Oct 2021 16:34:30 +0100
From:   John Keeping <john@...anate.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     John Keeping <john@...anate.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] drm/panel: ilitek-ili9881c: Read panel orientation

The panel orientation needs to parsed from a device-tree and assigned to
the panel's connector in order to make orientation property available to
userspace. That's what this patch does for ILI9881C based panels.

Signed-off-by: John Keeping <john@...anate.com>
---
 drivers/gpu/drm/panel/panel-ilitek-ili9881c.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/gpu/drm/panel/panel-ilitek-ili9881c.c b/drivers/gpu/drm/panel/panel-ilitek-ili9881c.c
index d68c52bd53c2..ba30d11547ad 100644
--- a/drivers/gpu/drm/panel/panel-ilitek-ili9881c.c
+++ b/drivers/gpu/drm/panel/panel-ilitek-ili9881c.c
@@ -52,6 +52,8 @@ struct ili9881c {
 
 	struct regulator	*power;
 	struct gpio_desc	*reset;
+
+	enum drm_panel_orientation	orientation;
 };
 
 #define ILI9881C_SWITCH_PAGE_INSTR(_page)	\
@@ -851,6 +853,8 @@ 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;
 
+	drm_connector_set_panel_orientation(connector, ctx->orientation);
+
 	return 1;
 }
 
@@ -887,6 +891,13 @@ static int ili9881c_dsi_probe(struct mipi_dsi_device *dsi)
 		return dev_err_probe(&dsi->dev, PTR_ERR(ctx->reset),
 				     "Couldn't get our reset GPIO\n");
 
+	ret = of_drm_get_panel_orientation(dsi->dev.of_node, &ctx->orientation);
+	if (ret) {
+		dev_err(&dsi->dev, "%pOF: failed to get orientation: %d\n",
+			dsi->dev.of_node, ret);
+		return ret;
+	}
+
 	ret = drm_panel_of_backlight(&ctx->panel);
 	if (ret)
 		return ret;
-- 
2.33.1