diff options
| -rw-r--r-- | drivers/gpu/drm/drm_modes.c | 33 | ||||
| -rw-r--r-- | include/drm/drmP.h | 4 |
2 files changed, 37 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c index 9f3f20bde399..04fa6f1808d1 100644 --- a/drivers/gpu/drm/drm_modes.c +++ b/drivers/gpu/drm/drm_modes.c @@ -35,6 +35,7 @@ #include <linux/export.h> #include <drm/drmP.h> #include <drm/drm_crtc.h> +#include <video/of_videomode.h> #include <video/videomode.h> /** @@ -541,6 +542,38 @@ int drm_display_mode_from_videomode(const struct videomode *vm, EXPORT_SYMBOL_GPL(drm_display_mode_from_videomode); #endif +#if IS_ENABLED(CONFIG_OF_VIDEOMODE) +/** + * of_get_drm_display_mode - get a drm_display_mode from devicetree + * @np: device_node with the timing specification + * @dmode: will be set to the return value + * @index: index into the list of display timings in devicetree + * + * This function is expensive and should only be used, if only one mode is to be + * read from DT. To get multiple modes start with of_get_display_timings and + * work with that instead. + */ +int of_get_drm_display_mode(struct device_node *np, + struct drm_display_mode *dmode, int index) +{ + struct videomode vm; + int ret; + + ret = of_get_videomode(np, &vm, index); + if (ret) + return ret; + + drm_display_mode_from_videomode(&vm, dmode); + + pr_debug("%s: got %dx%d display mode from %s\n", + of_node_full_name(np), vm.hactive, vm.vactive, np->name); + drm_mode_debug_printmodeline(dmode); + + return 0; +} +EXPORT_SYMBOL_GPL(of_get_drm_display_mode); +#endif + /** * drm_mode_set_name - set the name on a mode * @mode: name will be set in this mode diff --git a/include/drm/drmP.h b/include/drm/drmP.h index d5c06ffb7a31..fcc9d2382590 100644 --- a/include/drm/drmP.h +++ b/include/drm/drmP.h @@ -85,6 +85,7 @@ struct module; struct drm_file; struct drm_device; +struct device_node; struct videomode; #include <drm/drm_os_linux.h> @@ -1460,6 +1461,9 @@ drm_mode_create_from_cmdline_mode(struct drm_device *dev, extern int drm_display_mode_from_videomode(const struct videomode *vm, struct drm_display_mode *dmode); +extern int of_get_drm_display_mode(struct device_node *np, + struct drm_display_mode *dmode, + int index); /* Modesetting support */ extern void drm_vblank_pre_modeset(struct drm_device *dev, int crtc); |