From: Russell King <rmk+kernel@armlinux.org.uk>
Date: Sat, 14 Jul 2018 10:17:45 +0000 (+0100)
Subject: drm/armada: add CRTC mode validation
X-Git-Tag: v5.3-rc1~22^2~10^2~6
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=7f07ce0f04e25cd41a85ee780dbe85b40c9e3482;p=linux-block.git

drm/armada: add CRTC mode validation

Add CRTC mode validation to reject modes that the CRTC does not support.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
---

diff --git a/drivers/gpu/drm/armada/armada_crtc.c b/drivers/gpu/drm/armada/armada_crtc.c
index d802a6bc2d9f..edce74f60198 100644
--- a/drivers/gpu/drm/armada/armada_crtc.c
+++ b/drivers/gpu/drm/armada/armada_crtc.c
@@ -168,6 +168,25 @@ static void armada_drm_update_gamma(struct drm_crtc *crtc)
 	}
 }
 
+static enum drm_mode_status armada_drm_crtc_mode_valid(struct drm_crtc *crtc,
+	const struct drm_display_mode *mode)
+{
+	if (mode->vscan > 1)
+		return MODE_NO_VSCAN;
+
+	if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
+		return MODE_NO_DBLESCAN;
+
+	if (mode->flags & DRM_MODE_FLAG_HSKEW)
+		return MODE_H_ILLEGAL;
+
+	if (mode->flags & (DRM_MODE_FLAG_BCAST | DRM_MODE_FLAG_PIXMUX |
+			   DRM_MODE_FLAG_CLKDIV2))
+		return MODE_BAD;
+
+	return MODE_OK;
+}
+
 /* The mode_config.mutex will be held for this call */
 static bool armada_drm_crtc_mode_fixup(struct drm_crtc *crtc,
 	const struct drm_display_mode *mode, struct drm_display_mode *adj)
@@ -499,6 +518,7 @@ static void armada_drm_crtc_atomic_enable(struct drm_crtc *crtc,
 }
 
 static const struct drm_crtc_helper_funcs armada_crtc_helper_funcs = {
+	.mode_valid	= armada_drm_crtc_mode_valid,
 	.mode_fixup	= armada_drm_crtc_mode_fixup,
 	.mode_set_nofb	= armada_drm_crtc_mode_set_nofb,
 	.atomic_check	= armada_drm_crtc_atomic_check,