This patch uses the much lighter mode_set_base instead of calling a full
mode set. Tested on a i915 netbook. Patch should be against drm-core-next.
Signed-By: James Simmons <jsimmons@xxxxxxxxxxxxx>
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 7196620..99889e3 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -730,15 +730,20 @@ int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
struct fb_info *info)
{
struct drm_fb_helper *fb_helper = info->par;
+ struct drm_crtc_helper_funcs *crtc_funcs;
struct drm_device *dev = fb_helper->dev;
struct drm_mode_set *modeset;
struct drm_crtc *crtc;
- int ret = 0;
+ int ret = -ENXIO;
int i;
mutex_lock(&dev->mode_config.mutex);
for (i = 0; i < fb_helper->crtc_count; i++) {
crtc = fb_helper->crtc_info[i].mode_set.crtc;
+ crtc_funcs = crtc->helper_private;
+
+ if (!crtc_funcs->mode_set_base)
+ continue;
modeset = &fb_helper->crtc_info[i].mode_set;
@@ -746,7 +751,8 @@ int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
modeset->y = var->yoffset;
if (modeset->num_connectors) {
- ret = crtc->funcs->set_config(modeset);
+ ret = crtc_funcs->mode_set_base(crtc, modeset->x,
+ modeset->y, crtc->fb);
if (!ret) {
info->var.xoffset = var->xoffset;
info->var.yoffset = var->yoffset;
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