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From 9185a16ce8804d35339402c6aec38a528cc2c7a1 Mon Sep 17 00:00:00 2001
From: Dave Stevenson <dave.stevenson@raspberrypi.org>
Date: Wed, 10 Apr 2019 17:43:57 +0100
Subject: [PATCH] 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 <dave.stevenson@raspberrypi.org>
---
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
@@ -627,7 +627,17 @@ 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,
@@ -737,10 +747,11 @@ 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[] = {
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