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drm/modes: Add of_get_drm_panel_display_mode()

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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
This commit is contained in:
Noralf Trønnes 2022-02-27 13:47:11 +01:00 committed by Maxime Ripard
parent 5558d6c23d
commit 95ae342dc9
No known key found for this signature in database
GPG Key ID: E3EF0D6F671851C5
2 changed files with 57 additions and 0 deletions
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49
drivers/gpu/drm/drm_modes.c
View File

@ -35,6 +35,7 @@
#include <linux/list_sort.h> #include <linux/list_sort.h>
#include <linux/export.h> #include <linux/export.h>
#include <video/of_display_timing.h>
#include <video/of_videomode.h> #include <video/of_videomode.h>
#include <video/videomode.h> #include <video/videomode.h>
@ -727,6 +728,54 @@ int of_get_drm_display_mode(struct device_node *np,
return 0; return 0;
} }
EXPORT_SYMBOL_GPL(of_get_drm_display_mode); 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_OF */
#endif /* CONFIG_VIDEOMODE_HELPERS */ #endif /* CONFIG_VIDEOMODE_HELPERS */

8
include/drm/drm_modes.h
View File

@ -466,6 +466,8 @@ void drm_bus_flags_from_videomode(const struct videomode *vm, u32 *bus_flags);
int of_get_drm_display_mode(struct device_node *np, int of_get_drm_display_mode(struct device_node *np,
struct drm_display_mode *dmode, u32 *bus_flags, struct drm_display_mode *dmode, u32 *bus_flags,
int index); int index);
int of_get_drm_panel_display_mode(struct device_node *np,
struct drm_display_mode *dmode, u32 *bus_flags);
#else #else
static inline int of_get_drm_display_mode(struct device_node *np, static inline int of_get_drm_display_mode(struct device_node *np,
struct drm_display_mode *dmode, struct drm_display_mode *dmode,
@ -473,6 +475,12 @@ static inline int of_get_drm_display_mode(struct device_node *np,
{ {
return -EINVAL; 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 #endif
void drm_mode_set_name(struct drm_display_mode *mode); void drm_mode_set_name(struct drm_display_mode *mode);