From patchwork Fri Sep 1 23:41:22 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Doug Anderson X-Patchwork-Id: 13372953 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 5A9A4CA0FF8 for ; Fri, 1 Sep 2023 23:44:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1351321AbjIAXoL (ORCPT ); Fri, 1 Sep 2023 19:44:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38134 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1351302AbjIAXoD (ORCPT ); Fri, 1 Sep 2023 19:44:03 -0400 Received: from mail-oo1-xc30.google.com (mail-oo1-xc30.google.com [IPv6:2607:f8b0:4864:20::c30]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 660B91711 for ; Fri, 1 Sep 2023 16:43:27 -0700 (PDT) Received: by mail-oo1-xc30.google.com with SMTP id 006d021491bc7-5735282d713so1489515eaf.2 for ; Fri, 01 Sep 2023 16:43:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1693611769; x=1694216569; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=+uOG7orqF4actDsz25kkoaGcb+oSREvVrWkgMBMJJLo=; b=SRrtO74To+xOSsfEnrnrc/0pZK86OkB8mybSOAdCR3tzNO9KrEFhAfMaT522/JHv5K l8mwVKK6C73d7B6DSQMO9Xm5HFNEf69yWff7Dns3A2RzkzpDgEfS082QYwg5QRSMFvgZ SwUkKSeTZmsBFlluUIGhC7xbxEQH55xj5o764= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1693611769; x=1694216569; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=+uOG7orqF4actDsz25kkoaGcb+oSREvVrWkgMBMJJLo=; b=V7k/9LM+WcHsBI9N6KjRvbIM1ewhVsWqtaMWbS3/K0+JSFr5JmowtpqzggfSjQuM/Y FoK6YZ4ecO/wnDm5F5JV1klQeS8NI3LzCtaJxtZua2vl52nn1VJR9F1IBYcvQtZ0fKOq F8LpXLFDZf94onQcBo0uGPtu/ikSWElOeGcT3R70appF4zGO+FhG4tg5GvYf/fxuYeRP lomF9jwVWSomZtbu0ms3WrRPGniXVNsDJnJeq+6kk3gN/bWd+kR8boxM5ZKPhgVIJYBA oWoyrLjxHzO8F87p2kLalKkhFFN18jJ51Ac7xVDMdm/Uw2XP97BojtJFFJZFgyweJOpK TerQ== X-Gm-Message-State: AOJu0YwG+ylBbW1TkvbOnLHeJwpbsxVgoTy5vBmS7I1p/zNyZD1/7Ufi F4XKxcZ7r0UPzUr4jzTUNmLnXA== X-Google-Smtp-Source: AGHT+IEtno2sAZxUeLfldTVuC/n8wvbt8r9p0WUGoKpJ49IMbd/DsuhRqnZWTnQHfwEPIadZyumfcA== X-Received: by 2002:a05:6358:7e03:b0:127:f2fb:d103 with SMTP id o3-20020a0563587e0300b00127f2fbd103mr3928386rwm.16.1693611769417; Fri, 01 Sep 2023 16:42:49 -0700 (PDT) Received: from tictac2.mtv.corp.google.com ([2620:15c:9d:2:8d94:1fc5:803c:41cc]) by smtp.gmail.com with ESMTPSA id o9-20020a639a09000000b0056c3a4a3ca5sm3326390pge.36.2023.09.01.16.42.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 01 Sep 2023 16:42:48 -0700 (PDT) From: Douglas Anderson To: dri-devel@lists.freedesktop.org, Maxime Ripard Cc: Douglas Anderson , airlied@gmail.com, alim.akhtar@samsung.com, daniel@ffwll.ch, inki.dae@samsung.com, krzysztof.kozlowski@linaro.org, kyungmin.park@samsung.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-samsung-soc@vger.kernel.org, sw0312.kim@samsung.com Subject: [RFT PATCH 11/15] drm/exynos: Call drm_atomic_helper_shutdown() at shutdown/unbind time Date: Fri, 1 Sep 2023 16:41:22 -0700 Message-ID: <20230901164111.RFT.11.Iea33274908b6b258955f45a8aaf6f5bba24ad6cd@changeid> X-Mailer: git-send-email 2.42.0.283.g2d96d420d3-goog In-Reply-To: <20230901234202.566951-1-dianders@chromium.org> References: <20230901234202.566951-1-dianders@chromium.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org Based on grepping through the source code this driver appears to be missing a call to drm_atomic_helper_shutdown() at system shutdown time and at driver unbind time. Among other things, this means that if a panel is in use that it won't be cleanly powered off at system shutdown time. The fact that we should call drm_atomic_helper_shutdown() in the case of OS shutdown/restart and at driver remove (or unbind) time comes straight out of the kernel doc "driver instance overview" in drm_drv.c. A few notes about this fix: - When adding drm_atomic_helper_shutdown() to the unbind path, I added it after drm_kms_helper_poll_fini() since that's when other drivers seemed to have it. - Technically with a previous patch, ("drm/atomic-helper: drm_atomic_helper_shutdown(NULL) should be a noop"), we don't actually need to check to see if our "drm" pointer is NULL before calling drm_atomic_helper_shutdown(). We'll leave the "if" test in, though, so that this patch can land without any dependencies. It could potentially be removed later. - This patch also makes sure to set the drvdata to NULL in the case of bind errors to make sure that shutdown can't access freed data. Suggested-by: Maxime Ripard Signed-off-by: Douglas Anderson Reviewed-by: Maxime Ripard --- This commit is only compile-time tested. drivers/gpu/drm/exynos/exynos_drm_drv.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.c b/drivers/gpu/drm/exynos/exynos_drm_drv.c index 8399256cb5c9..5380fb6c55ae 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_drv.c +++ b/drivers/gpu/drm/exynos/exynos_drm_drv.c @@ -300,6 +300,7 @@ static int exynos_drm_bind(struct device *dev) drm_mode_config_cleanup(drm); exynos_drm_cleanup_dma(drm); kfree(private); + dev_set_drvdata(dev, NULL); err_free_drm: drm_dev_put(drm); @@ -313,6 +314,7 @@ static void exynos_drm_unbind(struct device *dev) drm_dev_unregister(drm); drm_kms_helper_poll_fini(drm); + drm_atomic_helper_shutdown(drm); component_unbind_all(drm->dev, drm); drm_mode_config_cleanup(drm); @@ -350,9 +352,18 @@ static int exynos_drm_platform_remove(struct platform_device *pdev) return 0; } +static void exynos_drm_platform_shutdown(struct platform_device *pdev) +{ + struct drm_device *drm = platform_get_drvdata(pdev); + + if (drm) + drm_atomic_helper_shutdown(drm); +} + static struct platform_driver exynos_drm_platform_driver = { .probe = exynos_drm_platform_probe, .remove = exynos_drm_platform_remove, + .shutdown = exynos_drm_platform_shutdown, .driver = { .name = "exynos-drm", .pm = &exynos_drm_pm_ops,