5.15-stable review patch. If anyone has any objections, please let me know.
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From: Maarten Lankhorst dev@lankhorst.se
commit f4a9dd57e549a17a7dac1c1defec26abd7e5c2d4 upstream.
Tiled displays have a different x/y offset to begin with. Instead of attempting to remember this, just apply a delta instead.
This fixes the first tile being duplicated on other tiles when vt switching.
Acked-by: Thomas Zimmermann tzimmermann@suse.de Link: https://patchwork.freedesktop.org/patch/msgid/20250116142825.3933-1-dev@lank... Signed-off-by: Maarten Lankhorst dev@lankhorst.se Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/drm_fb_helper.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-)
--- a/drivers/gpu/drm/drm_fb_helper.c +++ b/drivers/gpu/drm/drm_fb_helper.c @@ -1407,14 +1407,14 @@ int drm_fb_helper_set_par(struct fb_info } EXPORT_SYMBOL(drm_fb_helper_set_par);
-static void pan_set(struct drm_fb_helper *fb_helper, int x, int y) +static void pan_set(struct drm_fb_helper *fb_helper, int dx, int dy) { struct drm_mode_set *mode_set;
mutex_lock(&fb_helper->client.modeset_mutex); drm_client_for_each_modeset(mode_set, &fb_helper->client) { - mode_set->x = x; - mode_set->y = y; + mode_set->x += dx; + mode_set->y += dy; } mutex_unlock(&fb_helper->client.modeset_mutex); } @@ -1423,16 +1423,18 @@ static int pan_display_atomic(struct fb_ struct fb_info *info) { struct drm_fb_helper *fb_helper = info->par; - int ret; + int ret, dx, dy;
- pan_set(fb_helper, var->xoffset, var->yoffset); + dx = var->xoffset - info->var.xoffset; + dy = var->yoffset - info->var.yoffset; + pan_set(fb_helper, dx, dy);
ret = drm_client_modeset_commit_locked(&fb_helper->client); if (!ret) { info->var.xoffset = var->xoffset; info->var.yoffset = var->yoffset; } else - pan_set(fb_helper, info->var.xoffset, info->var.yoffset); + pan_set(fb_helper, -dx, -dy);
return ret; }