From patchwork Wed Aug 24 13:00:32 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tomi Valkeinen X-Patchwork-Id: 12953511 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 225E1C00140 for ; Wed, 24 Aug 2022 13:02:15 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 1CA2310EAA8; Wed, 24 Aug 2022 13:02:13 +0000 (UTC) Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [213.167.242.64]) by gabe.freedesktop.org (Postfix) with ESMTPS id 1808910E66F for ; Wed, 24 Aug 2022 13:00:54 +0000 (UTC) Received: from deskari.lan (91-158-154-79.elisa-laajakaista.fi [91.158.154.79]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id F1D55592; Wed, 24 Aug 2022 15:00:51 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1661346052; bh=qd2zwmFtWKzt3wNOwGSiPpn0zrJLLpoC1FlvscOYJWI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=i1PHfpn0swXSUjWiVrVJll9g2IZkf4T/vZKpiJOTrfnqzx+/uAy1YxXMxIUI7mUPI JcC06UvAY553nXc+EwM0WY5Da9pZl2BRvlG93YYFJFEoFYXvow+Lll5pKKVXzYyyOR 8vj9Ke9GFzFDeBshUwGTIHw1R/LsmUlrGvx2fBpk= From: Tomi Valkeinen To: Douglas Anderson , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Kieran Bingham , dri-devel@lists.freedesktop.org, linux-renesas-soc@vger.kernel.org Subject: [PATCH v5 2/4] drm/bridge: ti-sn65dsi86: Reject modes with too large blanking Date: Wed, 24 Aug 2022 16:00:32 +0300 Message-Id: <20220824130034.196041-3-tomi.valkeinen@ideasonboard.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220824130034.196041-1-tomi.valkeinen@ideasonboard.com> References: <20220824130034.196041-1-tomi.valkeinen@ideasonboard.com> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Tomi Valkeinen Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" From: Tomi Valkeinen The blanking related registers are 8 bits, so reject any modes with larger blanking periods. Signed-off-by: Tomi Valkeinen Reviewed-by: Laurent Pinchart --- drivers/gpu/drm/bridge/ti-sn65dsi86.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c index ba84215c1511..f085a037ff5b 100644 --- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c +++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c @@ -752,6 +752,29 @@ ti_sn_bridge_mode_valid(struct drm_bridge *bridge, if (mode->clock > 594000) return MODE_CLOCK_HIGH; + /* + * The blanking related registers are 8 bits, so reject any modes + * with larger blanking periods. + */ + + if ((mode->hsync_start - mode->hdisplay) > 0xff) + return MODE_HBLANK_WIDE; + + if ((mode->vsync_start - mode->vdisplay) > 0xff) + return MODE_VBLANK_WIDE; + + if ((mode->hsync_end - mode->hsync_start) > 0xff) + return MODE_HSYNC_WIDE; + + if ((mode->vsync_end - mode->vsync_start) > 0xff) + return MODE_VSYNC_WIDE; + + if ((mode->htotal - mode->hsync_end) > 0xff) + return MODE_HBLANK_WIDE; + + if ((mode->vtotal - mode->vsync_end) > 0xff) + return MODE_VBLANK_WIDE; + return MODE_OK; }