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@metanate.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20211020153432.383845-4-john@metanate.com

diff --git a/drivers/gpu/drm/panel/panel-ilitek-ili9881c.c b/drivers/gpu/drm/panel/panel-ilitek-ili9881c.c
index c12faef..754a0c7 100644 (file)
--- 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;