From: Sean Paul <redacted>

This patch adds the ability to override the typical display timing for a
given panel. This is useful for devices which have timing constraints
that do not apply across the entire display driver (eg: to avoid
crosstalk between panel and digitizer on certain laptops). The rules are
as follows:

- panel must not specify fixed mode (since the override mode will
  either be the same as the fixed mode, or we'll be unable to
  check the bounds of the overried)
- panel must specify at least one display_timing range which will be
  used to ensure the override mode fits within its bounds

Changes in v2:
 - Parse the full display-timings node (using the native-mode) (Rob)
Changes in v3:
 - No longer parse display-timings subnode, use panel-timing (Rob)
Changes in v4:
 - Don't add mode from timing if override was specified (Thierry)
 - Add warning if timing and fixed mode was specified (Thierry)
 - Don't add fixed mode if timing was specified (Thierry)
 - Refactor/rename a bit to avoid extra indentation from "if" tests
 - i should be unsigned (Thierry)
 - Add annoying WARN_ONs for some cases (Thierry)
 - Simplify 'No display_timing found' handling (Thierry)
 - Rename to panel_simple_parse_override_mode() (Thierry)
Changes in v5:
 - Added Heiko's Tested-by

Cc: Doug Anderson <dianders@chromium.org>
Cc: Eric Anholt <redacted>
Cc: Heiko Stuebner <heiko@sntech.de>
Cc: Jeffy Chen <redacted>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Stéphane Marchesin <redacted>
Cc: Thierry Reding <redacted>
Cc: devicetree@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Sean Paul <redacted>
Tested-by: Enric Balletbo i Serra <redacted>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Tested-by: Heiko Stuebner <heiko@sntech.de>
---

 drivers/gpu/drm/panel/panel-simple.c | 109 +++++++++++++++++++++++++--
 1 file changed, 104 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index 9e8218f6a3f2..ad4f4aac2d44 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c

@@ -34,6 +34,7 @@
 #include <drm/drm_panel.h>
 
 #include <video/display_timing.h>
+#include <video/of_display_timing.h>
 #include <video/videomode.h>
 
 struct panel_desc {

@@ -91,6 +92,8 @@ struct panel_simple {
 	struct i2c_adapter *ddc;
 
 	struct gpio_desc *enable_gpio;
+
+	struct drm_display_mode override_mode;

 };
 
 static inline struct panel_simple *to_panel_simple(struct drm_panel *panel)

@@ -98,16 +101,13 @@ static inline struct panel_simple *to_panel_simple(struct drm_panel *panel)
 	return container_of(panel, struct panel_simple, base);
 }
 
-static int panel_simple_get_fixed_modes(struct panel_simple *panel)
+static unsigned int panel_simple_get_timings_modes(struct panel_simple *panel)
 {
 	struct drm_connector *connector = panel->base.connector;
 	struct drm_device *drm = panel->base.drm;
 	struct drm_display_mode *mode;
 	unsigned int i, num = 0;
 
-	if (!panel->desc)
-		return 0;
-
 	for (i = 0; i < panel->desc->num_timings; i++) {
 		const struct display_timing *dt = &panel->desc->timings[i];
 		struct videomode vm;

@@ -131,6 +131,16 @@ static int panel_simple_get_fixed_modes(struct panel_simple *panel)
 		num++;
 	}
 
+	return num;
+}
+
+static unsigned int panel_simple_get_fixed_modes(struct panel_simple *panel)
+{
+	struct drm_connector *connector = panel->base.connector;
+	struct drm_device *drm = panel->base.drm;
+	struct drm_display_mode *mode;
+	unsigned int i, num = 0;
+
 	for (i = 0; i < panel->desc->num_modes; i++) {
 		const struct drm_display_mode *m = &panel->desc->modes[i];
 

@@ -152,6 +162,44 @@ static int panel_simple_get_fixed_modes(struct panel_simple *panel)
 		num++;
 	}
 
+	return num;
+}
+
+static int panel_simple_get_non_edid_modes(struct panel_simple *panel)
+{
+	struct drm_connector *connector = panel->base.connector;
+	struct drm_device *drm = panel->base.drm;
+	struct drm_display_mode *mode;
+	bool has_override = panel->override_mode.type;

+	 *
+	 * We should only ever have either the display timings specified
+	 * or a fixed mode. Anything else is rather bogus.
+	 */
+	WARN_ON(panel->desc->num_timings && panel->desc->num_modes);
+	if (num == 0)
+		num = panel_simple_get_fixed_modes(panel);
+
 	connector->display_info.bpc = panel->desc->bpc;
 	connector->display_info.width_mm = panel->desc->size.width;
 	connector->display_info.height_mm = panel->desc->size.height;

@@ -268,7 +316,7 @@ static int panel_simple_get_modes(struct drm_panel *panel)
 	}
 
 	/* add hard-coded panel modes */
-	num += panel_simple_get_fixed_modes(p);
+	num += panel_simple_get_non_edid_modes(p);
 
 	return num;
 }

@@ -299,10 +347,58 @@ static const struct drm_panel_funcs panel_simple_funcs = {
 	.get_timings = panel_simple_get_timings,
 };
 
+#define PANEL_SIMPLE_BOUNDS_CHECK(to_check, bounds, field) \
+	(to_check->field.typ >= bounds->field.min && \
+	 to_check->field.typ <= bounds->field.max)
+static void panel_simple_parse_override_mode(struct device *dev,
+					     struct panel_simple *panel,
+					     const struct display_timing *ot)
+{
+	const struct panel_desc *desc = panel->desc;
+	struct videomode vm;
+	unsigned int i;
+
+	if (WARN_ON(desc->num_modes)) {
+		dev_err(dev, "Reject override mode: panel has a fixed mode\n");
+		return;
+	}
+	if (WARN_ON(!desc->num_timings)) {
+		dev_err(dev, "Reject override mode: no timings specified\n");
+		return;
+	}
+
+	for (i = 0; i < panel->desc->num_timings; i++) {
+		const struct display_timing *dt = &panel->desc->timings[i];
+
+		if (!PANEL_SIMPLE_BOUNDS_CHECK(ot, dt, hactive) ||
+		    !PANEL_SIMPLE_BOUNDS_CHECK(ot, dt, hfront_porch) ||
+		    !PANEL_SIMPLE_BOUNDS_CHECK(ot, dt, hback_porch) ||
+		    !PANEL_SIMPLE_BOUNDS_CHECK(ot, dt, hsync_len) ||
+		    !PANEL_SIMPLE_BOUNDS_CHECK(ot, dt, vactive) ||
+		    !PANEL_SIMPLE_BOUNDS_CHECK(ot, dt, vfront_porch) ||
+		    !PANEL_SIMPLE_BOUNDS_CHECK(ot, dt, vback_porch) ||
+		    !PANEL_SIMPLE_BOUNDS_CHECK(ot, dt, vsync_len))
+			continue;
+
+		if (ot->flags != dt->flags)
+			continue;

+		panel->override_mode.type |= DRM_MODE_TYPE_DRIVER |
+					     DRM_MODE_TYPE_PREFERRED;
+		break;
+	}
+
+	if (WARN_ON(!panel->override_mode.type))
+		dev_err(dev, "Reject override mode: No display_timing found\n");
+}
+
 static int panel_simple_probe(struct device *dev, const struct panel_desc *desc)
 {
 	struct device_node *backlight, *ddc;
 	struct panel_simple *panel;
+	struct display_timing dt;
 	int err;
 
 	panel = devm_kzalloc(dev, sizeof(*panel), GFP_KERNEL);

@@ -348,6 +444,9 @@ static int panel_simple_probe(struct device *dev, const struct panel_desc *desc)
 		}
 	}
 
+	if (!of_get_display_timing(dev->of_node, "panel-timing", &dt))
+		panel_simple_parse_override_mode(dev, panel, &dt);
+