On Tue, Aug 3, 2010 at 8:01 AM, James Simmons <jsimmons@xxxxxxxxxxxxx> wrote:
>
> 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.
The kms code should always fallback if appropriate, I've definitely
seen some modesets I thought were triggered by the pan_display
codepath, so I'd expect if we add this, we might some base sets at the
wrong time. Unless we can prove we only get pan_displays when
expected.
Dave.
>
> 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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>
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