From patchwork Fri Apr 23 17:27:45 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dafna Hirschfeld X-Patchwork-Id: 12221139 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=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,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 15A3CC433B4 for ; Fri, 23 Apr 2021 17:27:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DD60361410 for ; Fri, 23 Apr 2021 17:27:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231522AbhDWR2b (ORCPT ); Fri, 23 Apr 2021 13:28:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53886 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229549AbhDWR2b (ORCPT ); Fri, 23 Apr 2021 13:28:31 -0400 Received: from bhuna.collabora.co.uk (bhuna.collabora.co.uk [IPv6:2a00:1098:0:82:1000:25:2eeb:e3e3]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9FC32C061574; Fri, 23 Apr 2021 10:27:54 -0700 (PDT) Received: from guri.fritz.box (unknown [IPv6:2a02:810a:880:f54:79a2:c598:7744:783a]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: dafna) by bhuna.collabora.co.uk (Postfix) with ESMTPSA id 735381F43D84; Fri, 23 Apr 2021 18:27:52 +0100 (BST) From: Dafna Hirschfeld To: linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org Cc: dafna.hirschfeld@collabora.com, kernel@collabora.com, dafna3@gmail.com, enric.balletbo@collabora.com, tiffany.lin@mediatek.com, andrew-ct.chen@mediatek.com, minghsiu.tsai@mediatek.com, houlong.wei@mediatek.com, mchehab@kernel.org, matthias.bgg@gmail.com, linux-media@vger.kernel.org Subject: [PATCH] media: mtk-vpu: on suspend, read/write regs only if vpu is running Date: Fri, 23 Apr 2021 19:27:45 +0200 Message-Id: <20210423172745.30092-1-dafna.hirschfeld@collabora.com> X-Mailer: git-send-email 2.17.1 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org If the vpu is not running, we should not relay on VPU_IDLE_REG value. In this case, the suspend cb should only unprepare the clock. This fixes a system-wide suspend to ram failure: [ 273.073363] PM: suspend entry (deep) [ 273.410502] mtk-msdc 11230000.mmc: phase: [map:ffffffff] [maxlen:32] [final:10] [ 273.455926] Filesystems sync: 0.378 seconds [ 273.589707] Freezing user space processes ... (elapsed 0.003 seconds) done. [ 273.600104] OOM killer disabled. [ 273.603409] Freezing remaining freezable tasks ... (elapsed 0.001 seconds) done. [ 273.613361] mwifiex_sdio mmc2:0001:1: None of the WOWLAN triggers enabled [ 274.784952] mtk_vpu 10020000.vpu: vpu idle timeout [ 274.789764] PM: dpm_run_callback(): platform_pm_suspend+0x0/0x70 returns -5 [ 274.796740] mtk_vpu 10020000.vpu: PM: failed to suspend: error -5 [ 274.802842] PM: Some devices failed to suspend, or early wake event detected [ 275.426489] OOM killer enabled. [ 275.429718] Restarting tasks ... [ 275.435765] done. [ 275.447510] PM: suspend exit Fixes: 1f565e263c3e ("media: mtk-vpu: VPU should be in idle state before system is suspended") Signed-off-by: Dafna Hirschfeld --- drivers/media/platform/mtk-vpu/mtk_vpu.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/media/platform/mtk-vpu/mtk_vpu.c b/drivers/media/platform/mtk-vpu/mtk_vpu.c index 043894f7188c..f49f6d53a941 100644 --- a/drivers/media/platform/mtk-vpu/mtk_vpu.c +++ b/drivers/media/platform/mtk-vpu/mtk_vpu.c @@ -987,6 +987,12 @@ static int mtk_vpu_suspend(struct device *dev) return ret; } + if (!vpu_running(vpu)) { + vpu_clock_disable(vpu); + clk_unprepare(vpu->clk); + return 0; + } + mutex_lock(&vpu->vpu_mutex); /* disable vpu timer interrupt */ vpu_cfg_writel(vpu, vpu_cfg_readl(vpu, VPU_INT_STATUS) | VPU_IDLE_STATE,