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From ab0dac9b018f82dfb5696e9671734178d226872f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Noralf=20Tr=C3=B8nnes?= <noralf@tronnes.org>
Date: Sun, 27 Feb 2022 13:47:11 +0100
Subject: [PATCH] drm/modes: Add of_get_drm_panel_display_mode()
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
commit 95ae342 upstream.
Add a function to get a drm_display_mode from a panel-timing
device tree subnode.
Suggested-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20220227124713.39766-4-noralf@tronnes.org
---
drivers/gpu/drm/drm_modes.c | 49 +++++++++++++++++++++++++++++++++++++
include/drm/drm_modes.h | 8 ++++++
2 files changed, 57 insertions(+)
--- a/drivers/gpu/drm/drm_modes.c
+++ b/drivers/gpu/drm/drm_modes.c
@@ -35,6 +35,7 @@
#include <linux/list_sort.h>
#include <linux/export.h>
+#include <video/of_display_timing.h>
#include <video/of_videomode.h>
#include <video/videomode.h>
@@ -727,6 +728,54 @@ int of_get_drm_display_mode(struct devic
return 0;
}
EXPORT_SYMBOL_GPL(of_get_drm_display_mode);
+
+/**
+ * of_get_drm_panel_display_mode - get a panel-timing drm_display_mode from devicetree
+ * @np: device_node with the panel-timing specification
+ * @dmode: will be set to the return value
+ * @bus_flags: information about pixelclk, sync and DE polarity
+ *
+ * The Device Tree properties width-mm and height-mm will be read and set on
+ * the display mode if they are present.
+ *
+ * Returns:
+ * Zero on success, negative error code on failure.
+ */
+int of_get_drm_panel_display_mode(struct device_node *np,
+ struct drm_display_mode *dmode, u32 *bus_flags)
+{
+ u32 width_mm = 0, height_mm = 0;
+ struct display_timing timing;
+ struct videomode vm;
+ int ret;
+
+ ret = of_get_display_timing(np, "panel-timing", &timing);
+ if (ret)
+ return ret;
+
+ videomode_from_timing(&timing, &vm);
+
+ memset(dmode, 0, sizeof(*dmode));
+ drm_display_mode_from_videomode(&vm, dmode);
+ if (bus_flags)
+ drm_bus_flags_from_videomode(&vm, bus_flags);
+
+ ret = of_property_read_u32(np, "width-mm", &width_mm);
+ if (ret && ret != -EINVAL)
+ return ret;
+
+ ret = of_property_read_u32(np, "height-mm", &height_mm);
+ if (ret && ret != -EINVAL)
+ return ret;
+
+ dmode->width_mm = width_mm;
+ dmode->height_mm = height_mm;
+
+ drm_mode_debug_printmodeline(dmode);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(of_get_drm_panel_display_mode);
#endif /* CONFIG_OF */
#endif /* CONFIG_VIDEOMODE_HELPERS */
--- a/include/drm/drm_modes.h
+++ b/include/drm/drm_modes.h
@@ -466,6 +466,8 @@ void drm_bus_flags_from_videomode(const
int of_get_drm_display_mode(struct device_node *np,
struct drm_display_mode *dmode, u32 *bus_flags,
int index);
+int of_get_drm_panel_display_mode(struct device_node *np,
+ struct drm_display_mode *dmode, u32 *bus_flags);
#else
static inline int of_get_drm_display_mode(struct device_node *np,
struct drm_display_mode *dmode,
@@ -473,6 +475,12 @@ static inline int of_get_drm_display_mod
{
return -EINVAL;
}
+
+static inline int of_get_drm_panel_display_mode(struct device_node *np,
+ struct drm_display_mode *dmode, u32 *bus_flags)
+{
+ return -EINVAL;
+}
#endif
void drm_mode_set_name(struct drm_display_mode *mode);
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