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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,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 B7B57C55186 for ; Wed, 22 Apr 2020 10:40:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 968C520656 for ; Wed, 22 Apr 2020 10:40:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587552028; bh=FIPNM7KHXezPRFmRpolI3sdXFbEDJs3ESlzqr8tNr1o=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=S2bZ4YUjB7AqRflccOUrgXhTulHUfZ40An9W3bFUo5EvNw5jmVuQ+84xAYM42m7ke 3FyRMgrxuJG7JyaAuNroa2E2o4XvU37Vw5+72Sm6RtPV4nbnuNM8Jtsm/jsSxLxevq aAr3eu1kdQ1yWictXU7oDFVd7tVYbsRqEjss/XeQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731608AbgDVKk1 (ORCPT ); Wed, 22 Apr 2020 06:40:27 -0400 Received: from mail.kernel.org ([198.145.29.99]:56922 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730133AbgDVKVM (ORCPT ); Wed, 22 Apr 2020 06:21:12 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 671FF21582; Wed, 22 Apr 2020 10:20:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587550856; bh=FIPNM7KHXezPRFmRpolI3sdXFbEDJs3ESlzqr8tNr1o=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZpYPpSYJJU+DTn0QGxNKUUoFgVCRmteE7B5lUMVG7G2V/J5B+WmV7gNr8+a4KKNUA VQ4Elbv6SOEpGEySM/BrBcpCsLISRzBgfrKvKgxcrHGqZSk85hEIMv0Q2Wvn4ritzp vw1cmK2PWWcU9apmk59yQhy7C4a84Eik8350EscA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Stefan Wahren , Dave Stevenson , Nicolas Saenz Julienne , Maxime Ripard , Sasha Levin Subject: [PATCH 5.4 086/118] drm/vc4: Fix HDMI mode validation Date: Wed, 22 Apr 2020 11:57:27 +0200 Message-Id: <20200422095045.567943245@linuxfoundation.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200422095031.522502705@linuxfoundation.org> References: <20200422095031.522502705@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Nicolas Saenz Julienne [ Upstream commit b1e7396a1d0e6af6806337fdaaa44098d6b3343c ] Current mode validation impedes setting up some video modes which should be supported otherwise. Namely 1920x1200@60Hz. Fix this by lowering the minimum HDMI state machine clock to pixel clock ratio allowed. Fixes: 32e823c63e90 ("drm/vc4: Reject HDMI modes with too high of clocks.") Reported-by: Stefan Wahren Suggested-by: Dave Stevenson Signed-off-by: Nicolas Saenz Julienne Signed-off-by: Maxime Ripard Link: https://patchwork.freedesktop.org/patch/msgid/20200326122001.22215-1-nsaenzjulienne@suse.de Signed-off-by: Sasha Levin --- drivers/gpu/drm/vc4/vc4_hdmi.c | 20 ++++++++++++++++---- 1 file changed, 16 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c index 0853b980bcb31..d5f5ba4105241 100644 --- a/drivers/gpu/drm/vc4/vc4_hdmi.c +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c @@ -681,11 +681,23 @@ static enum drm_mode_status vc4_hdmi_encoder_mode_valid(struct drm_encoder *crtc, const struct drm_display_mode *mode) { - /* HSM clock must be 108% of the pixel clock. Additionally, - * the AXI clock needs to be at least 25% of pixel clock, but - * HSM ends up being the limiting factor. + /* + * As stated in RPi's vc4 firmware "HDMI state machine (HSM) clock must + * be faster than pixel clock, infinitesimally faster, tested in + * simulation. Otherwise, exact value is unimportant for HDMI + * operation." This conflicts with bcm2835's vc4 documentation, which + * states HSM's clock has to be at least 108% of the pixel clock. + * + * Real life tests reveal that vc4's firmware statement holds up, and + * users are able to use pixel clocks closer to HSM's, namely for + * 1920x1200@60Hz. So it was decided to have leave a 1% margin between + * both clocks. Which, for RPi0-3 implies a maximum pixel clock of + * 162MHz. + * + * Additionally, the AXI clock needs to be at least 25% of + * pixel clock, but HSM ends up being the limiting factor. */ - if (mode->clock > HSM_CLOCK_FREQ / (1000 * 108 / 100)) + if (mode->clock > HSM_CLOCK_FREQ / (1000 * 101 / 100)) return MODE_CLOCK_HIGH; return MODE_OK; -- 2.20.1