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path: root/drivers/gpu/drm/drm_modes.c
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Diffstat (limited to 'drivers/gpu/drm/drm_modes.c')
-rw-r--r--drivers/gpu/drm/drm_modes.c70
1 files changed, 70 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
index d8da30e90db5..04fa6f1808d1 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