[Intel-gfx] [PATCH 3/4] drm: add drm_mode_same_size function

[Jesse Barnes]

From: Kristian Høgsberg <hoegsberg at gmail.com>

Like mode_equal but w/o the clock checks.  Useful for checking if modes
are close enough to re-use to avoid a boot time mode set for example.

Signed-off-by: Kristian Høgsberg <hoegsberg at gmail.com>
Signed-off-by: Jesse Barnes <jbarnes at virtuousgeek.org>
---
 drivers/gpu/drm/drm_modes.c | 8 ++++++++
 include/drm/drm_modes.h     | 2 ++
 2 files changed, 10 insertions(+)

diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
index d1b7d20..51ede38 100644
--- a/drivers/gpu/drm/drm_modes.c
+++ b/drivers/gpu/drm/drm_modes.c
@@ -905,6 +905,14 @@ bool drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode *mode1,
 }
 EXPORT_SYMBOL(drm_mode_equal_no_clocks_no_stereo);
 
+bool drm_mode_same_size(const struct drm_display_mode *mode1,
+			const struct drm_display_mode *mode2)
+{
+	return mode1->vdisplay == mode2->vdisplay &&
+		mode1->hdisplay == mode2->hdisplay;
+}
+EXPORT_SYMBOL(drm_mode_same_size);
+
 /**
  * drm_mode_validate_size - make sure modes adhere to size constraints
  * @dev: DRM device
diff --git a/include/drm/drm_modes.h b/include/drm/drm_modes.h
index 91d0582..7272309 100644
--- a/include/drm/drm_modes.h
+++ b/include/drm/drm_modes.h
@@ -215,6 +215,8 @@ bool drm_mode_equal(const struct drm_display_mode *mode1,
 		    const struct drm_display_mode *mode2);
 bool drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode *mode1,
 					const struct drm_display_mode *mode2);
+bool drm_mode_same_size(const struct drm_display_mode *mode1,
+			const struct drm_display_mode *mode2);
 
 /* for use by the crtc helper probe functions */
 void drm_mode_validate_size(struct drm_device *dev,
-- 
1.9.1