From patchwork Fri Dec 18 22:31:11 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alex Deucher X-Patchwork-Id: 7888891 Return-Path: X-Original-To: patchwork-dri-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id B54349F387 for ; Fri, 18 Dec 2015 22:31:27 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id D571D20525 for ; Fri, 18 Dec 2015 22:31:25 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by mail.kernel.org (Postfix) with ESMTP id E518920522 for ; Fri, 18 Dec 2015 22:31:24 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 3C8416E389; Fri, 18 Dec 2015 14:31:23 -0800 (PST) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from mail-qg0-f41.google.com (mail-qg0-f41.google.com [209.85.192.41]) by gabe.freedesktop.org (Postfix) with ESMTPS id 1BA246E37E for ; Fri, 18 Dec 2015 14:31:22 -0800 (PST) Received: by mail-qg0-f41.google.com with SMTP id k90so65178395qge.0 for ; Fri, 18 Dec 2015 14:31:22 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:cc:subject:date:message-id; bh=IV7vXJ5BhQEyGZjZB2cybyzbC9YXStDLbfnbEAacufI=; b=AvdZXobZ77gf5+Ze+bYmSVhoe7SSfh8hiUJsYXcHfpKSx1honls4CrSR8QXZ6wt3+5 /Q118fkwkythLKo3wkS5MLp/oU1fU6XltTXps/afpFLKIn69ixlfR/A0Rp3ZUFrQH40i edKlw2ccpqNIdZ8Pn042Wp/UWIEfpw6FB5CdaK+/Ygd47iL/fQNch7Lp5ULpSrWyTVKR SBetGLKBrz4hiQZ1AmohuZ/MedEXa4GxRvxUEkK3rV8Dgc0ZQF4KfIRpDV00Kj561Czl KbfQRV5x87p0zqzqzmAu54Hh+x8ig1HAgtAmi6LuOae8dEE04VTb/a8D9WfgG04+fEvk qSEQ== X-Received: by 10.141.7.69 with SMTP id j66mr9343603qhd.2.1450477881009; Fri, 18 Dec 2015 14:31:21 -0800 (PST) Received: from cm.localdomain (static-74-96-105-49.washdc.fios.verizon.net. [74.96.105.49]) by smtp.gmail.com with ESMTPSA id q78sm7666333qha.13.2015.12.18.14.31.20 (version=TLSv1/SSLv3 cipher=OTHER); Fri, 18 Dec 2015 14:31:20 -0800 (PST) From: Alex Deucher X-Google-Original-From: Alex Deucher To: dri-devel@lists.freedesktop.org Subject: [PATCH 1/2] drm/amdgpu: fix dp link rate selection (v2) Date: Fri, 18 Dec 2015 17:31:11 -0500 Message-Id: <1450477872-19768-1-git-send-email-alexander.deucher@amd.com> X-Mailer: git-send-email 2.5.0 Cc: Alex Deucher X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" X-Spam-Status: No, score=-4.1 required=5.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED, FREEMAIL_FROM, RCVD_IN_DNSWL_MED, T_DKIM_INVALID, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Need to properly handle the max link rate in the dpcd. This prevents some cases where 5.4 Ghz is selected when it shouldn't be. v2: simplify logic, add array bounds check Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/amdgpu/atombios_dp.c | 96 ++++++++++++-------------------- 1 file changed, 36 insertions(+), 60 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/atombios_dp.c b/drivers/gpu/drm/amd/amdgpu/atombios_dp.c index 92b6aca..21aacc1 100644 --- a/drivers/gpu/drm/amd/amdgpu/atombios_dp.c +++ b/drivers/gpu/drm/amd/amdgpu/atombios_dp.c @@ -243,7 +243,7 @@ static void amdgpu_atombios_dp_get_adjust_train(const u8 link_status[DP_LINK_STA /* convert bits per color to bits per pixel */ /* get bpc from the EDID */ -static int amdgpu_atombios_dp_convert_bpc_to_bpp(int bpc) +static unsigned amdgpu_atombios_dp_convert_bpc_to_bpp(int bpc) { if (bpc == 0) return 24; @@ -251,64 +251,32 @@ static int amdgpu_atombios_dp_convert_bpc_to_bpp(int bpc) return bpc * 3; } -/* get the max pix clock supported by the link rate and lane num */ -static int amdgpu_atombios_dp_get_max_dp_pix_clock(int link_rate, - int lane_num, - int bpp) -{ - return (link_rate * lane_num * 8) / bpp; -} - /***** amdgpu specific DP functions *****/ -/* First get the min lane# when low rate is used according to pixel clock - * (prefer low rate), second check max lane# supported by DP panel, - * if the max lane# < low rate lane# then use max lane# instead. - */ -static int amdgpu_atombios_dp_get_dp_lane_number(struct drm_connector *connector, +static int amdgpu_atombios_dp_get_dp_link_config(struct drm_connector *connector, const u8 dpcd[DP_DPCD_SIZE], - int pix_clock) -{ - int bpp = amdgpu_atombios_dp_convert_bpc_to_bpp(amdgpu_connector_get_monitor_bpc(connector)); - int max_link_rate = drm_dp_max_link_rate(dpcd); - int max_lane_num = drm_dp_max_lane_count(dpcd); - int lane_num; - int max_dp_pix_clock; - - for (lane_num = 1; lane_num < max_lane_num; lane_num <<= 1) { - max_dp_pix_clock = amdgpu_atombios_dp_get_max_dp_pix_clock(max_link_rate, lane_num, bpp); - if (pix_clock <= max_dp_pix_clock) - break; - } - - return lane_num; -} - -static int amdgpu_atombios_dp_get_dp_link_clock(struct drm_connector *connector, - const u8 dpcd[DP_DPCD_SIZE], - int pix_clock) + unsigned pix_clock, + unsigned *dp_lanes, unsigned *dp_rate) { - int bpp = amdgpu_atombios_dp_convert_bpc_to_bpp(amdgpu_connector_get_monitor_bpc(connector)); - int lane_num, max_pix_clock; - - if (amdgpu_connector_encoder_get_dp_bridge_encoder_id(connector) == - ENCODER_OBJECT_ID_NUTMEG) - return 270000; - - lane_num = amdgpu_atombios_dp_get_dp_lane_number(connector, dpcd, pix_clock); - max_pix_clock = amdgpu_atombios_dp_get_max_dp_pix_clock(162000, lane_num, bpp); - if (pix_clock <= max_pix_clock) - return 162000; - max_pix_clock = amdgpu_atombios_dp_get_max_dp_pix_clock(270000, lane_num, bpp); - if (pix_clock <= max_pix_clock) - return 270000; - if (amdgpu_connector_is_dp12_capable(connector)) { - max_pix_clock = amdgpu_atombios_dp_get_max_dp_pix_clock(540000, lane_num, bpp); - if (pix_clock <= max_pix_clock) - return 540000; + unsigned bpp = + amdgpu_atombios_dp_convert_bpc_to_bpp(amdgpu_connector_get_monitor_bpc(connector)); + static const unsigned link_rates[3] = { 162000, 270000, 540000 }; + unsigned max_link_rate = drm_dp_max_link_rate(dpcd); + unsigned max_lane_num = drm_dp_max_lane_count(dpcd); + unsigned lane_num, i, max_pix_clock; + + for (lane_num = 1; lane_num <= max_lane_num; lane_num <<= 1) { + for (i = 0; i < ARRAY_SIZE(link_rates) && link_rates[i] <= max_link_rate; i++) { + max_pix_clock = (lane_num * link_rates[i] * 8) / bpp; + if (max_pix_clock >= pix_clock) { + *dp_lanes = lane_num; + *dp_rate = link_rates[i]; + return 0; + } + } } - return drm_dp_max_link_rate(dpcd); + return -EINVAL; } static u8 amdgpu_atombios_dp_encoder_service(struct amdgpu_device *adev, @@ -422,6 +390,7 @@ void amdgpu_atombios_dp_set_link_config(struct drm_connector *connector, { struct amdgpu_connector *amdgpu_connector = to_amdgpu_connector(connector); struct amdgpu_connector_atom_dig *dig_connector; + int ret; if (!amdgpu_connector->con_priv) return; @@ -429,10 +398,14 @@ void amdgpu_atombios_dp_set_link_config(struct drm_connector *connector, if ((dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_DISPLAYPORT) || (dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_eDP)) { - dig_connector->dp_clock = - amdgpu_atombios_dp_get_dp_link_clock(connector, dig_connector->dpcd, mode->clock); - dig_connector->dp_lane_count = - amdgpu_atombios_dp_get_dp_lane_number(connector, dig_connector->dpcd, mode->clock); + ret = amdgpu_atombios_dp_get_dp_link_config(connector, dig_connector->dpcd, + mode->clock, + &dig_connector->dp_lane_count, + &dig_connector->dp_clock); + if (ret) { + dig_connector->dp_clock = 0; + dig_connector->dp_lane_count = 0; + } } } @@ -441,14 +414,17 @@ int amdgpu_atombios_dp_mode_valid_helper(struct drm_connector *connector, { struct amdgpu_connector *amdgpu_connector = to_amdgpu_connector(connector); struct amdgpu_connector_atom_dig *dig_connector; - int dp_clock; + unsigned dp_lanes, dp_clock; + int ret; if (!amdgpu_connector->con_priv) return MODE_CLOCK_HIGH; dig_connector = amdgpu_connector->con_priv; - dp_clock = - amdgpu_atombios_dp_get_dp_link_clock(connector, dig_connector->dpcd, mode->clock); + ret = amdgpu_atombios_dp_get_dp_link_config(connector, dig_connector->dpcd, + mode->clock, &dp_lanes, &dp_clock); + if (ret) + return MODE_CLOCK_HIGH; if ((dp_clock == 540000) && (!amdgpu_connector_is_dp12_capable(connector)))