From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 02938C43381 for ; Sun, 24 Mar 2019 19:06:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C80252133F for ; Sun, 24 Mar 2019 19:06:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728797AbfCXTGW (ORCPT ); Sun, 24 Mar 2019 15:06:22 -0400 Received: from mailoutvs30.siol.net ([185.57.226.221]:51078 "EHLO mail.siol.net" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726347AbfCXTGW (ORCPT ); Sun, 24 Mar 2019 15:06:22 -0400 Received: from localhost (localhost [127.0.0.1]) by mail.siol.net (Postfix) with ESMTP id 01A40521801; Sun, 24 Mar 2019 20:06:19 +0100 (CET) X-Virus-Scanned: amavisd-new at psrvmta10.zcs-production.pri Received: from mail.siol.net ([127.0.0.1]) by localhost (psrvmta10.zcs-production.pri [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id 2-7ImW5wSYML; Sun, 24 Mar 2019 20:06:18 +0100 (CET) Received: from mail.siol.net (localhost [127.0.0.1]) by mail.siol.net (Postfix) with ESMTPS id 9BCFB520BC8; Sun, 24 Mar 2019 20:06:18 +0100 (CET) Received: from localhost.localdomain (cpe-86-58-52-202.static.triera.net [86.58.52.202]) (Authenticated sender: 031275009) by mail.siol.net (Postfix) with ESMTPSA id 7C137521801; Sun, 24 Mar 2019 20:06:16 +0100 (CET) From: Jernej Skrabec To: maxime.ripard@bootlin.com Cc: airlied@linux.ie, daniel@ffwll.ch, wens@csie.org, dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH] drm/sun4i: DW HDMI: Lower max. supported rate for H6 Date: Sun, 24 Mar 2019 20:06:09 +0100 Message-Id: <20190324190609.32721-1-jernej.skrabec@siol.net> X-Mailer: git-send-email 2.21.0 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Currently resolutions with pixel clock higher than 340 MHz don't work with H6 HDMI controller. They just produce a blank screen. Limit maximum pixel clock rate to 340 MHz until scrambling is supported. Cc: stable@vger.kernel.org # 5.0 Fixes: 40bb9d3147b2 ("drm/sun4i: Add support for H6 DW HDMI controller") Signed-off-by: Jernej Skrabec --- drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c b/drivers/gpu/drm/sun4= i/sun8i_dw_hdmi.c index caea5a9f8f1d..ba4ce576b471 100644 --- a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c +++ b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c @@ -48,8 +48,13 @@ static enum drm_mode_status sun8i_dw_hdmi_mode_valid_h6(struct drm_connector *connector, const struct drm_display_mode *mode) { - /* This is max for HDMI 2.0b (4K@60Hz) */ - if (mode->clock > 594000) + /* + * Controller support maximum of 594 MHz, which correlates to + * 4K@60Hz 4:4:4 or RGB. However, for frequencies greater than + * 340 MHz scrambling has to be enabled. Because scrambling is + * not yet implemented, just limit to 340 MHz for now. + */ + if (mode->clock > 340000) return MODE_CLOCK_HIGH; =20 return MODE_OK; --=20 2.21.0