From db4c02e439f7b66f5a6f8a5421a4956d111bc015 Mon Sep 17 00:00:00 2001
From: Linus Walleij <linus.walleij@linaro.org>
Date: Wed, 11 Nov 2020 00:46:53 +0100
Subject: [PATCH] drm/panel: s6e63m0: Set up some display info
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Copy over the width/height in millimeters to the
(somewhat redundant) display info, and set up the
bus format and bus flags for the display.

When used as DPI this display requires DE to be
active low and pixel data to be output on the
negative edge. It might be that it was previously
used with a display controller that either does
not support these settings or was hardcoded to use
these as default. This information comes from the
source code of the Samsung GT-I9070 mobile phone.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Stephan Gerhold <stephan@gerhold.net>
Cc: Paweł Chmiel <pawel.mikolaj.chmiel@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201110234653.2248594-6-linus.walleij@linaro.org
---
 drivers/gpu/drm/panel/panel-samsung-s6e63m0.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c b/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c
index 3eee67e..210e70d 100644
--- a/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c
+++ b/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c
@@ -16,6 +16,7 @@
 #include <linux/gpio/consumer.h>
 #include <linux/module.h>
 #include <linux/regulator/consumer.h>
+#include <linux/media-bus-format.h>
 
 #include <video/mipi_display.h>
 
@@ -410,6 +411,7 @@ static int s6e63m0_get_modes(struct drm_panel *panel,
 			     struct drm_connector *connector)
 {
 	struct drm_display_mode *mode;
+	static const u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
 
 	mode = drm_mode_duplicate(connector->dev, &default_mode);
 	if (!mode) {
@@ -419,6 +421,13 @@ static int s6e63m0_get_modes(struct drm_panel *panel,
 		return -ENOMEM;
 	}
 
+	connector->display_info.width_mm = mode->width_mm;
+	connector->display_info.height_mm = mode->height_mm;
+	drm_display_info_set_bus_formats(&connector->display_info,
+					 &bus_format, 1);
+	connector->display_info.bus_flags = DRM_BUS_FLAG_DE_LOW |
+		DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE;
+
 	drm_mode_set_name(mode);
 
 	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
-- 
2.7.4