Signed-off-by: Adam Jackson <a...@redhat.com>
---
drivers/gpu/drm/drm_modes.c | 28 +++++++++++++++++++++++++++-
include/drm/drm_crtc.h | 7 ++++---
2 files changed, 31 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
index 51f6772..6d81a02 100644
--- a/drivers/gpu/drm/drm_modes.c
+++ b/drivers/gpu/drm/drm_modes.c
@@ -553,6 +553,32 @@ int drm_mode_height(struct drm_display_mode *mode)
}
EXPORT_SYMBOL(drm_mode_height);
+/** drm_mode_hsync - get the hsync of a mode
+ * @mode: mode
+ *
+ * LOCKING:
+ * None.
+ *
+ * Return @modes's hsync rate in kHz, rounded to the nearest int.
+ */
+int drm_mode_hsync(struct drm_display_mode *mode)
+{
+ unsigned int calc_val;
+
+ if (mode->hsync)
+ return mode->hsync;
+
+ if (mode->htotal < 0)
+ return 0;
+
+ calc_val = (mode->clock * 1000) / mode->htotal; /* hsync in Hz */
+ calc_val += 500; /* round to 1000Hz */
+ calc_val /= 1000; /* truncate to kHz */
+
+ return calc_val;
+}
+EXPORT_SYMBOL(drm_mode_hsync);
+
/**
* drm_mode_vrefresh - get the vrefresh of a mode
* @mode: mode
@@ -560,7 +586,7 @@ EXPORT_SYMBOL(drm_mode_height);
* LOCKING:
* None.
*
- * Return @mode's vrefresh rate or calculate it if necessary.
+ * Return @mode's vrefresh rate in Hz or calculate it if necessary.
*
* FIXME: why is this needed? shouldn't vrefresh be set already?
*
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index d84fba1..938f327 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -123,7 +123,7 @@ struct drm_display_mode {
int type;
/* Proposed mode values */
- int clock;
+ int clock; /* in kHz */
int hdisplay;
int hsync_start;
int hsync_end;
@@ -164,8 +164,8 @@ struct drm_display_mode {
int *private;
int private_flags;
- int vrefresh;
- float hsync;
+ int vrefresh; /* in Hz */
+ int hsync; /* in kHz */
};
enum drm_connector_status {
@@ -681,6 +681,7 @@ extern void drm_mode_validate_size(struct drm_device *dev,
extern void drm_mode_prune_invalid(struct drm_device *dev,
struct list_head *mode_list, bool verbose);
extern void drm_mode_sort(struct list_head *mode_list);
+extern int drm_mode_hsync(struct drm_display_mode *mode);
extern int drm_mode_vrefresh(struct drm_display_mode *mode);
extern void drm_mode_set_crtcinfo(struct drm_display_mode *p,
int adjust_flags);
--
1.6.5.2
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