[PATCH 3/3] drm: Store the calculated vrefresh in the user mode

Ville Syrjala
2018-03-13T15:07:59Z

From: Ville Syrjälä <ville.syrjala@linux.intel.com>

Ignore the vrefresh in the mode the user passed in and instead
calculate the value based on the actual timings. This way we can
actually trust mode->vrefresh to some degree.

Or should we compare the user's idea of vrefresh with the one
we get from the timings and return an error if they differ? We
can't really be sure what the user is asking in that case.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
drivers/gpu/drm/drm_modes.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
index f6b7c0e36a1a..021526ec6fa0 100644
--- a/drivers/gpu/drm/drm_modes.c
+++ b/drivers/gpu/drm/drm_modes.c
@@ -1609,7 +1609,11 @@ int drm_mode_convert_umode(struct drm_device *dev,
out->vsync_end = in->vsync_end;
out->vtotal = in->vtotal;
out->vscan = in->vscan;
- out->vrefresh = in->vrefresh;
+ /*
+ * Ignore what the user is saying here and instead
+ * calculate vrefresh based on the actual timings.
+ */
+ out->vrefresh = 0;
out->flags = in->flags;
out->type = in->type;
strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN);
@@ -1619,6 +1623,8 @@ int drm_mode_convert_umode(struct drm_device *dev,
if (out->status != MODE_OK)
return -EINVAL;

+ out->vrefresh = drm_mode_vrefresh(out);
+
drm_mode_set_crtcinfo(out, CRTC_INTERLACE_HALVE_V);

return 0;
--
2.16.1