This is just a minor optimization to the fb panning code. In debugging some other issues, I noticed a lot of no-op calls to the set_config routine with all the same parameters and tracked down the source to the fb helper pan routine.
So add an additional check for actual panning relative to the current
crtc config to avoid unnecessary set_config calls.
Signed-off-by: Jesse Barnes <jbar...@virtuousgeek.org>
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index f7c6854..4dd81f3 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -739,7 +739,8 @@ int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
modeset->x = var->xoffset;
modeset->y = var->yoffset;
- if (modeset->num_connectors) {
+ if (((modeset->x != crtc->x) || (modeset->y != crtc->y)) &&
+ modeset->num_connectors) {
ret = crtc->funcs->set_config(modeset);
if (!ret) {
info->var.xoffset = var->xoffset;
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