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 E3684C43217 for ; Tue, 18 Jan 2022 02:32:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239256AbiARCcY (ORCPT ); Mon, 17 Jan 2022 21:32:24 -0500 Received: from ams.source.kernel.org ([145.40.68.75]:42354 "EHLO ams.source.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344290AbiARC3k (ORCPT ); Mon, 17 Jan 2022 21:29:40 -0500 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 CD70AB8123A; Tue, 18 Jan 2022 02:29:38 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id F189FC36AE3; Tue, 18 Jan 2022 02:29:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1642472977; bh=Evjdvma7DpXHpludweJifTmE2JUT8KCAToNGDJW3x2k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=eerbGhrlNLP1/Tud2Kbz0yribI4ym6EHqKcbPOTVKvZmz8NCkLshL108ayIw1FxFh gbnvQwlmNATRb5IpfyKLQLeheRJUKRQlrst6QL7O1rafv/BOFjrJjX1nIbmtE5x21L /EW+Veb8Ogt7H6FIBKQv9/tK1QU75lEo2vr/dJ0IGckEjbJ1bVoXdc2FAoVVbufdFq nWlWmZa3cN5JUbWsshVtyBmTfyAb2d2wvpgtgNNlQbb0cNppSQ+dstoyI0jiLaqDPZ leOHpDXW6qUcrnJdGgr7Uzham9iOzf/mfktw/nvNyMGqPW0LGNizVdui2Dq1L24tZM zf09f3xmBT65Q== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Zongmin Zhou , Alex Deucher , Sasha Levin , christian.koenig@amd.com, Xinhui.Pan@amd.com, airlied@linux.ie, daniel@ffwll.ch, Felix.Kuehling@amd.com, evan.quan@amd.com, nirmoy.das@amd.com, andrey.grodzovsky@amd.com, Oak.Zeng@amd.com, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Subject: [PATCH AUTOSEL 5.16 186/217] drm/amdgpu: fixup bad vram size on gmc v8 Date: Mon, 17 Jan 2022 21:19:09 -0500 Message-Id: <20220118021940.1942199-186-sashal@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220118021940.1942199-1-sashal@kernel.org> References: <20220118021940.1942199-1-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: stable@vger.kernel.org From: Zongmin Zhou [ Upstream commit 11544d77e3974924c5a9c8a8320b996a3e9b2f8b ] Some boards(like RX550) seem to have garbage in the upper 16 bits of the vram size register. Check for this and clamp the size properly. Fixes boards reporting bogus amounts of vram. after add this patch,the maximum GPU VRAM size is 64GB, otherwise only 64GB vram size will be used. Signed-off-by: Zongmin Zhou Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin --- drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c index 492ebed2915be..63b890f1e8afb 100644 --- a/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c +++ b/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c @@ -515,10 +515,10 @@ static void gmc_v8_0_mc_program(struct amdgpu_device *adev) static int gmc_v8_0_mc_init(struct amdgpu_device *adev) { int r; + u32 tmp; adev->gmc.vram_width = amdgpu_atombios_get_vram_width(adev); if (!adev->gmc.vram_width) { - u32 tmp; int chansize, numchan; /* Get VRAM informations */ @@ -562,8 +562,15 @@ static int gmc_v8_0_mc_init(struct amdgpu_device *adev) adev->gmc.vram_width = numchan * chansize; } /* size in MB on si */ - adev->gmc.mc_vram_size = RREG32(mmCONFIG_MEMSIZE) * 1024ULL * 1024ULL; - adev->gmc.real_vram_size = RREG32(mmCONFIG_MEMSIZE) * 1024ULL * 1024ULL; + tmp = RREG32(mmCONFIG_MEMSIZE); + /* some boards may have garbage in the upper 16 bits */ + if (tmp & 0xffff0000) { + DRM_INFO("Probable bad vram size: 0x%08x\n", tmp); + if (tmp & 0xffff) + tmp &= 0xffff; + } + adev->gmc.mc_vram_size = tmp * 1024ULL * 1024ULL; + adev->gmc.real_vram_size = adev->gmc.mc_vram_size; if (!(adev->flags & AMD_IS_APU)) { r = amdgpu_device_resize_fb_bar(adev); -- 2.34.1