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 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 11F00C19F4F for ; Tue, 7 May 2024 23:09:34 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 6172C112FD9; Tue, 7 May 2024 23:09:33 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.b="uI/gZx5W"; dkim-atps=neutral Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by gabe.freedesktop.org (Postfix) with ESMTPS id 5D29C112FD9; Tue, 7 May 2024 23:09:32 +0000 (UTC) Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id BDB39619EF; Tue, 7 May 2024 23:09:31 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 24218C3277B; Tue, 7 May 2024 23:09:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1715123371; bh=qsBXv4eT55IdMwxy9x8mbzOnTPPBcW0txYfRfwsRTOg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=uI/gZx5WnRWJC+6PMPlWeY135Tysx0JsP5biVBNj4LNFlolwJuDwvyrt08VoFemIN rVbYaEhEXCaZMagmvT+b0W8J9bseUWn6QDyr21cBsERJHVy/zSBn5vJZKrQQxrpNXB bmraCeI65R3GDcqsc4x3o9X1rz9n2OBDejcHpbK3n3U7GUMs2ULgarOdE9/OnTGC4g 4SiXRVcI3aSzfexZgATV+uRF8iJrESXMb8dBF7BHW1VsxKPa3/mlzHaABbHEMIayzd ZNggkyBsHUXhgIwO1IjbVEdKVlTePUo3vzL7cqFBpBFt5VSkgau9j6ff9RruyWfDOq VkGdc9Ccdotow== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Meenakshikumar Somasundaram , PeiChen Huang , Aurabindo Pillai , 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@gmail.com, daniel@ffwll.ch, srinivasan.shanmugam@amd.com, nathan@kernel.org, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Subject: [PATCH AUTOSEL 6.8 39/52] drm/amd/display: Allocate zero bw after bw alloc enable Date: Tue, 7 May 2024 19:07:05 -0400 Message-ID: <20240507230800.392128-39-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240507230800.392128-1-sashal@kernel.org> References: <20240507230800.392128-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.8.9 Content-Transfer-Encoding: 8bit X-BeenThere: amd-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussion list for AMD gfx List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: amd-gfx-bounces@lists.freedesktop.org Sender: "amd-gfx" From: Meenakshikumar Somasundaram [ Upstream commit 46fe9cb1a9e62f4e6229f48ae303ef8e6c1fdc64 ] [Why] During DP tunnel creation, CM preallocates BW and reduces estimated BW of other DPIA. CM release preallocation only when allocation is complete. Display mode validation logic validates timings based on bw available per host router. In multi display setup, this causes bw allocation failure when allocation greater than estimated bw. [How] Do zero alloc to make the CM to release preallocation and update estimated BW correctly for all DPIAs per host router. Reviewed-by: PeiChen Huang Acked-by: Aurabindo Pillai Signed-off-by: Meenakshikumar Somasundaram Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin --- .../amd/display/dc/link/protocols/link_dp_dpia_bw.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia_bw.c b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia_bw.c index 5491b707cec88..5a965c26bf209 100644 --- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia_bw.c +++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia_bw.c @@ -270,7 +270,7 @@ static void set_usb4_req_bw_req(struct dc_link *link, int req_bw) /* Error check whether requested and allocated are equal */ req_bw = requested_bw * (Kbps_TO_Gbps / link->dpia_bw_alloc_config.bw_granularity); - if (req_bw == link->dpia_bw_alloc_config.allocated_bw) { + if (req_bw && (req_bw == link->dpia_bw_alloc_config.allocated_bw)) { DC_LOG_ERROR("%s: Request bw equals to allocated bw for link(%d)\n", __func__, link->link_index); } @@ -341,6 +341,14 @@ bool link_dp_dpia_set_dptx_usb4_bw_alloc_support(struct dc_link *link) ret = true; init_usb4_bw_struct(link); link->dpia_bw_alloc_config.bw_alloc_enabled = true; + + /* + * During DP tunnel creation, CM preallocates BW and reduces estimated BW of other + * DPIA. CM release preallocation only when allocation is complete. Do zero alloc + * to make the CM to release preallocation and update estimated BW correctly for + * all DPIAs per host router + */ + link_dp_dpia_allocate_usb4_bandwidth_for_stream(link, 0); } } -- 2.43.0