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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id CC047C3F6B0 for ; Thu, 25 Aug 2022 01:39:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233982AbiHYBj6 (ORCPT ); Wed, 24 Aug 2022 21:39:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53552 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233243AbiHYBjK (ORCPT ); Wed, 24 Aug 2022 21:39:10 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6AA649AF9D; Wed, 24 Aug 2022 18:37:44 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 2E598B826DA; Thu, 25 Aug 2022 01:37:40 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D5E97C433C1; Thu, 25 Aug 2022 01:37:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1661391459; bh=oZYVGgsaH2VFtB7OQwCBUSbZUvNKRGqOMHp98jOx8nE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZZ/e/vaU9Kp5DhrW1wWqdligfV7/WvMZup8Ko7Oj0R2LWLLHeaUEHXOxMPu9XdWwG 6eBu5tllLM5kyoo0ueK5HTryCO2COHBdrlp1+VSXyxNwoE9GIfZbxsq1gU/kP59+yb wOK79hkMG0PQBqQae8/gZboT87HU25e88Q8gPYEcNz7B6fUtMOyMPLub7L1xshd3NX oAOdym4lh4Ea8+hHB72mICdCHpz0gihCZ7/fCqyUgMmLawth4NDSaYGFv6mO+l8c58 L1g4zJjOXkspyJ/0Vyw5F+i8Y9HVEG7dARq2M5iiDtGvQht8f3pAy48DypXeJ7Lwmw 3h73TO8Aq0htQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Fudong Wang , Alvin Lee , Tom Chung , Daniel Wheeler , Alex Deucher , Sasha Levin , harry.wentland@amd.com, sunpeng.li@amd.com, Rodrigo.Siqueira@amd.com, christian.koenig@amd.com, Xinhui.Pan@amd.com, airlied@linux.ie, daniel@ffwll.ch, Charlene.Liu@amd.com, HaoPing.Liu@amd.com, Jun.Lei@amd.com, oliver.logush@amd.com, isabbasso@riseup.net, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Subject: [PATCH AUTOSEL 5.15 06/20] drm/amd/display: clear optc underflow before turn off odm clock Date: Wed, 24 Aug 2022 21:36:58 -0400 Message-Id: <20220825013713.22656-6-sashal@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220825013713.22656-1-sashal@kernel.org> References: <20220825013713.22656-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Fudong Wang [ Upstream commit b2a93490201300a749ad261b5c5d05cb50179c44 ] [Why] After ODM clock off, optc underflow bit will be kept there always and clear not work. We need to clear that before clock off. [How] Clear that if have when clock off. Reviewed-by: Alvin Lee Acked-by: Tom Chung Signed-off-by: Fudong Wang Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin --- drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.c index 37848f4577b1..92fee47278e5 100644 --- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.c +++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.c @@ -480,6 +480,11 @@ void optc1_enable_optc_clock(struct timing_generator *optc, bool enable) OTG_CLOCK_ON, 1, 1, 1000); } else { + + //last chance to clear underflow, otherwise, it will always there due to clock is off. + if (optc->funcs->is_optc_underflow_occurred(optc) == true) + optc->funcs->clear_optc_underflow(optc); + REG_UPDATE_2(OTG_CLOCK_CONTROL, OTG_CLOCK_GATE_DIS, 0, OTG_CLOCK_EN, 0); -- 2.35.1