From patchwork Thu Sep 21 19:26:55 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Doug Anderson X-Patchwork-Id: 13394389 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 55DEBE7D0A2 for ; Thu, 21 Sep 2023 19:29:04 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 0F4D110E602; Thu, 21 Sep 2023 19:29:03 +0000 (UTC) Received: from mail-pl1-x634.google.com (mail-pl1-x634.google.com [IPv6:2607:f8b0:4864:20::634]) by gabe.freedesktop.org (Postfix) with ESMTPS id 1CE7F10E5FF for ; Thu, 21 Sep 2023 19:28:50 +0000 (UTC) Received: by mail-pl1-x634.google.com with SMTP id d9443c01a7336-1c4586b12feso11087745ad.2 for ; Thu, 21 Sep 2023 12:28:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1695324529; x=1695929329; darn=lists.freedesktop.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=6yWq/C0tGEFLQw6PZcuzFNMM1hDy2t48whBia8F49Jg=; b=AoIiSue3XWZTYqbaDx+xgbyTpQkTu/QPaBojtZ+UGpjBxx9muDoKy2THCzitzxAl8S 77YyPm+hAtXoQt1OgGSQchdghNvHgsbYXMSINIt46R1XjOGW5QZQ6T2jFS2TpQGIrS/b MbOpQ2V1VtismH/4IHHuSkWDzlPfr68BA/O1U= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1695324529; x=1695929329; 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=6yWq/C0tGEFLQw6PZcuzFNMM1hDy2t48whBia8F49Jg=; b=N1RCaZVWi/+o5vDMwqGu9yjSJ2RJBEjHTJhXgPBU2xRbyDONFRFp6bWn8uRFqImkEG tn1AIg09epOekpGtJ3UHEGdaP+wTrBM924RxXNx1HXb1C3ym8ikMYezwrziANRCLq4G1 7IAZ7+2dzA1qGnxCpV8eIjjJbX9V5yW/Y7PssWYbBFWKho6mSQeE3ZoVmIZEKsaRUGb5 S+PdL+hRFR7TenokQ09zCgNR8vBhYqf3LPwWy5EBZXpjyLdlZdzLYVXo0Mj7Ca9j0CHg SiyfTcbbtQMN3lfPjHnc0dmHEKvEKGj13Dkze7EDnkyli/XXPdaYWCKeufnGHh2mVeB6 YHzA== X-Gm-Message-State: AOJu0Yy8m1NAaI5EBxAy1mD5JOv2/8iQDKuJ6lo9SiHyFo8faVeejENY +LhAs/yPLiYS5aIg1cpEZyA3bpcjx7vLRRU/Ogp13IVs X-Google-Smtp-Source: AGHT+IG2w0WDLRZHyuJ2LAJ89ZhWzmeDvnFDIDFpOKHgPfnwnQMLnbx8TB6Jh7P+yKBv1bgwE5yOVg== X-Received: by 2002:a17:902:c409:b0:1c4:4a4d:cda with SMTP id k9-20020a170902c40900b001c44a4d0cdamr7404355plk.15.1695324528913; Thu, 21 Sep 2023 12:28:48 -0700 (PDT) Received: from tictac2.mtv.corp.google.com ([2620:15c:9d:2:e6ed:6d49:f262:8041]) by smtp.gmail.com with ESMTPSA id w8-20020a1709029a8800b001b9f032bb3dsm1892875plp.3.2023.09.21.12.28.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 21 Sep 2023 12:28:47 -0700 (PDT) From: Douglas Anderson To: dri-devel@lists.freedesktop.org, Maxime Ripard Subject: [RFT PATCH v2 12/12] drm/renesas/shmobile: Call drm_helper_force_disable_all() at shutdown/remove time Date: Thu, 21 Sep 2023 12:26:55 -0700 Message-ID: <20230921122641.RFT.v2.12.Iaf638a1d4c8b3c307a6192efabb4cbb06b195f15@changeid> X-Mailer: git-send-email 2.42.0.515.g380fc7ccd1-goog In-Reply-To: <20230921192749.1542462-1-dianders@chromium.org> References: <20230921192749.1542462-1-dianders@chromium.org> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: paul@crapouillou.net, tzimmermann@suse.de, Geert Uytterhoeven , sam@ravnborg.org, Douglas Anderson , linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org, kieran.bingham+renesas@ideasonboard.com, laurent.pinchart@ideasonboard.com, biju.das.jz@bp.renesas.com Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Based on grepping through the source code, this driver appears to be missing a call to drm_atomic_helper_shutdown(), or in this case the non-atomic equivalent drm_helper_force_disable_all(), at system shutdown time and at driver remove time. This is important because drm_helper_force_disable_all() will cause panels to get disabled cleanly which may be important for their power sequencing. Future changes will remove any custom powering off in individual panel drivers so the DRM drivers need to start getting this right. The fact that we should call drm_atomic_helper_shutdown(), or in this case the non-atomic equivalent drm_helper_force_disable_all(), in the case of OS shutdown/restart comes straight out of the kernel doc "driver instance overview" in drm_drv.c. Suggested-by: Maxime Ripard Cc: Geert Uytterhoeven Signed-off-by: Douglas Anderson --- This commit is only compile-time tested. As Geert pointed out in response to v1 [1], this patch conflicts with the patches doing atomic conversion [2]. Since those patches don't appear to be landed yet, I'm simply reposting v1. If those patches land, I'm more than happy to re-post this one. I'm also more than happy if someone wants to incorporate these changes into a different patch. [1] https://lore.kernel.org/r/CAMuHMdWOB7d-KE3F7aeZvVimNuy_U30uk=PND7=tWmPzCd7_eg@mail.gmail.com [2] https://lore.kernel.org/dri-devel/fd7a6702490bd431f314d6591551bb39e77e3304.1692178020.git.geert+renesas@glider.be/ Changes in v2: - Rebased and resolved conflicts. drivers/gpu/drm/renesas/shmobile/shmob_drm_drv.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/gpu/drm/renesas/shmobile/shmob_drm_drv.c b/drivers/gpu/drm/renesas/shmobile/shmob_drm_drv.c index e5db4e0095ba..8c4c9d17a79e 100644 --- a/drivers/gpu/drm/renesas/shmobile/shmob_drm_drv.c +++ b/drivers/gpu/drm/renesas/shmobile/shmob_drm_drv.c @@ -15,6 +15,7 @@ #include #include +#include #include #include #include @@ -179,10 +180,18 @@ static void shmob_drm_remove(struct platform_device *pdev) drm_dev_unregister(ddev); drm_kms_helper_poll_fini(ddev); + drm_helper_force_disable_all(ddev); free_irq(sdev->irq, ddev); drm_dev_put(ddev); } +static void shmob_drm_shutdown(struct platform_device *pdev) +{ + struct shmob_drm_device *sdev = platform_get_drvdata(pdev); + + drm_helper_force_disable_all(sdev->ddev); +} + static int shmob_drm_probe(struct platform_device *pdev) { struct shmob_drm_platform_data *pdata = pdev->dev.platform_data; @@ -287,6 +296,7 @@ static int shmob_drm_probe(struct platform_device *pdev) static struct platform_driver shmob_drm_platform_driver = { .probe = shmob_drm_probe, .remove_new = shmob_drm_remove, + .shutdown = shmob_drm_shutdown, .driver = { .name = "shmob-drm", .pm = pm_sleep_ptr(&shmob_drm_pm_ops),