diff options
Diffstat (limited to 'drivers/gpu/drm/drm_modes.c')
| -rw-r--r-- | drivers/gpu/drm/drm_modes.c | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c index d8da30e90db..04fa6f1808d 100644 --- a/drivers/gpu/drm/drm_modes.c +++ b/drivers/gpu/drm/drm_modes.c @@ -35,6 +35,8 @@ #include <linux/export.h> #include <drm/drmP.h> #include <drm/drm_crtc.h> +#include <video/of_videomode.h> +#include <video/videomode.h> /** * drm_mode_debug_printmodeline - debug print a mode @@ -504,6 +506,74 @@ drm_gtf_mode(struct drm_device *dev, int hdisplay, int vdisplay, int vrefresh, } EXPORT_SYMBOL(drm_gtf_mode); +#if IS_ENABLED(CONFIG_VIDEOMODE) +int drm_display_mode_from_videomode(const struct videomode *vm, + struct drm_display_mode *dmode) +{ + dmode->hdisplay = vm->hactive; + dmode->hsync_start = dmode->hdisplay + vm->hfront_porch; + dmode->hsync_end = dmode->hsync_start + vm->hsync_len; + dmode->htotal = dmode->hsync_end + vm->hback_porch; + + dmode->vdisplay = vm->vactive; + dmode->vsync_start = dmode->vdisplay + vm->vfront_porch; + dmode->vsync_end = dmode->vsync_start + vm->vsync_len; + dmode->vtotal = dmode->vsync_end + vm->vback_porch; + + dmode->clock = vm->pixelclock / 1000; + + dmode->flags = 0; + if (vm->dmt_flags & VESA_DMT_HSYNC_HIGH) + dmode->flags |= DRM_MODE_FLAG_PHSYNC; + else if (vm->dmt_flags & VESA_DMT_HSYNC_LOW) + dmode->flags |= DRM_MODE_FLAG_NHSYNC; + if (vm->dmt_flags & VESA_DMT_VSYNC_HIGH) + dmode->flags |= DRM_MODE_FLAG_PVSYNC; + else if (vm->dmt_flags & VESA_DMT_VSYNC_LOW) + dmode->flags |= DRM_MODE_FLAG_NVSYNC; + if (vm->data_flags & DISPLAY_FLAGS_INTERLACED) + dmode->flags |= DRM_MODE_FLAG_INTERLACE; + if (vm->data_flags & DISPLAY_FLAGS_DOUBLESCAN) + dmode->flags |= DRM_MODE_FLAG_DBLSCAN; + drm_mode_set_name(dmode); + + return 0; +} +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 |