[PATCH v5 09/12] drm/modes: Parse overscan properties

[Maxime Ripard]

Properly configuring the overscan properties might be needed for the
initial setup of the framebuffer for display that still have overscan.
Let's allow for more properties on the kernel command line to setup each
margin.

Reviewed-by: Noralf Trønnes <noralf at tronnes.org>
Signed-off-by: Maxime Ripard <maxime.ripard at bootlin.com>
---
 Documentation/fb/modedb.rst |  2 ++-
 drivers/gpu/drm/drm_modes.c | 44 ++++++++++++++++++++++++++++++++++++++-
 include/drm/drm_connector.h |  5 ++++-
 3 files changed, 51 insertions(+)

diff --git a/Documentation/fb/modedb.rst b/Documentation/fb/modedb.rst
index 3e8a6f79dcd7..444bc329e5a8 100644
--- a/Documentation/fb/modedb.rst
+++ b/Documentation/fb/modedb.rst
@@ -59,6 +59,8 @@ Options can also be passed after the mode, using commas as separator.
 
 Valid options are:
 
+  - margin_top, margin_bottom, margin_left, margin_right (integer):
+    Number of pixels in the margins, typically to deal with overscan on TVs
   - reflect_x (boolean): Perform an axial symetry on the X axis
   - reflect_y (boolean): Perform an axial symetry on the Y axis
   - rotate (integer): Rotate the initial framebuffer by x
diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
index dc6d11292685..57e6408288c8 100644
--- a/drivers/gpu/drm/drm_modes.c
+++ b/drivers/gpu/drm/drm_modes.c
@@ -1609,6 +1609,50 @@ static int drm_mode_parse_cmdline_options(char *str, size_t len,
 		} else if (!strncmp(option, "reflect_y", delim - option)) {
 			rotation |= DRM_MODE_REFLECT_Y;
 			sep = delim;
+		} else if (!strncmp(option, "margin_right", delim - option)) {
+			const char *value = delim + 1;
+			unsigned int margin;
+
+			margin = simple_strtol(value, &sep, 10);
+
+			/* Make sure we have parsed something */
+			if (sep == value)
+				return -EINVAL;
+
+			mode->tv_margins.right = margin;
+		} else if (!strncmp(option, "margin_left", delim - option)) {
+			const char *value = delim + 1;
+			unsigned int margin;
+
+			margin = simple_strtol(value, &sep, 10);
+
+			/* Make sure we have parsed something */
+			if (sep == value)
+				return -EINVAL;
+
+			mode->tv_margins.left = margin;
+		} else if (!strncmp(option, "margin_top", delim - option)) {
+			const char *value = delim + 1;
+			unsigned int margin;
+
+			margin = simple_strtol(value, &sep, 10);
+
+			/* Make sure we have parsed something */
+			if (sep == value)
+				return -EINVAL;
+
+			mode->tv_margins.top = margin;
+		} else if (!strncmp(option, "margin_bottom", delim - option)) {
+			const char *value = delim + 1;
+			unsigned int margin;
+
+			margin = simple_strtol(value, &sep, 10);
+
+			/* Make sure we have parsed something */
+			if (sep == value)
+				return -EINVAL;
+
+			mode->tv_margins.bottom = margin;
 		} else {
 			return -EINVAL;
 		}
diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index b22e3150e33d..ca745d9feaf5 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -1054,6 +1054,11 @@ struct drm_cmdline_mode {
 	 * DRM_MODE_ROTATE_0 and DRM_MODE_ROTATE_180.
 	 */
 	unsigned int rotation_reflection;
+
+	/**
+	 * @tv_margins: TV margins to apply to the mode.
+	 */
+	struct drm_connector_tv_margins tv_margins;
 };
 
 /**
-- 
git-series 0.9.1