[PATCH 3/4] drm: add drm_mode_same_size function

Jesse Barnes
2014-10-09T20:06:44Z

From: Kristian Høgsberg <hoegsberg@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@gmail.com>
Signed-off-by: Jesse Barnes <jbarnes@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