From 29838bd819e9b84b96e4681949ce757ca5d02d25 Mon Sep 17 00:00:00 2001 From: Dave Stevenson Date: Wed, 10 Apr 2019 17:43:57 +0100 Subject: [PATCH 604/782] drm: vc4: Bring fkms into line with kms in blocking doublescan modes Implement vc4_crtc_mode_valid so that it blocks doublescan modes Signed-off-by: Dave Stevenson --- drivers/gpu/drm/vc4/vc4_firmware_kms.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-) --- a/drivers/gpu/drm/vc4/vc4_firmware_kms.c +++ b/drivers/gpu/drm/vc4/vc4_firmware_kms.c @@ -625,7 +625,17 @@ static void vc4_crtc_enable(struct drm_c vc4_plane_set_blank(plane, plane->state->visible); } +static enum drm_mode_status +vc4_crtc_mode_valid(struct drm_crtc *crtc, const struct drm_display_mode *mode) +{ + /* Do not allow doublescan modes from user space */ + if (mode->flags & DRM_MODE_FLAG_DBLSCAN) { + DRM_DEBUG_KMS("[CRTC:%d] Doublescan mode rejected.\n", + crtc->base.id); + return MODE_NO_DBLESCAN; + } + return MODE_OK; } static int vc4_crtc_atomic_check(struct drm_crtc *crtc, @@ -735,10 +745,11 @@ static const struct drm_crtc_funcs vc4_c static const struct drm_crtc_helper_funcs vc4_crtc_helper_funcs = { .mode_set_nofb = vc4_crtc_mode_set_nofb, - .atomic_disable = vc4_crtc_disable, - .atomic_enable = vc4_crtc_enable, + .mode_valid = vc4_crtc_mode_valid, .atomic_check = vc4_crtc_atomic_check, .atomic_flush = vc4_crtc_atomic_flush, + .atomic_enable = vc4_crtc_enable, + .atomic_disable = vc4_crtc_disable, }; static const struct of_device_id vc4_firmware_kms_dt_match[] = {