From patchwork Sun Jan 22 15:04:28 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 13111500 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 BC8D2C25B4E for ; Sun, 22 Jan 2023 15:26:18 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 2CE5110E17C; Sun, 22 Jan 2023 15:26:18 +0000 (UTC) Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by gabe.freedesktop.org (Postfix) with ESMTPS id 19BA410E17C for ; Sun, 22 Jan 2023 15:26:15 +0000 (UTC) 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 dfw.source.kernel.org (Postfix) with ESMTPS id 40D1560BC5; Sun, 22 Jan 2023 15:26:15 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2D2FFC433D2; Sun, 22 Jan 2023 15:26:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1674401174; bh=R6digx9blFPhuYEDQsxztJ6n0HaeonF1eLnERsBaZ40=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Z7gcRp4GEyVoKKYOn70NMgkJCbnV/2NGuN7HIGWjiCLVAd3SerJSK/8d4qtaIxco5 xdTyzbG4aMVQBzDFCmajc7HrN3zOz0j82mPadZ7Bl/edbSX/u01YZ2kl07wRxA5fcg v4zaLFwl450ZbSQFqqHgJYE4+7c2c4cqNkzaFFys= From: Greg Kroah-Hartman To: stable@vger.kernel.org Date: Sun, 22 Jan 2023 16:04:28 +0100 Message-Id: <20230122150252.728651448@linuxfoundation.org> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230122150246.321043584@linuxfoundation.org> References: <20230122150246.321043584@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH 6.1 139/193] drm/i915: Allow switching away via vga-switcheroo if uninitialized X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Jason A. Donenfeld" , Ramalingam C , Andrzej Hajda , Julia Lawall , Jani Nikula , intel-gfx@lists.freedesktop.org, Lucas De Marchi , Rodrigo Vivi , Greg Kroah-Hartman , patches@lists.linux.dev, Thomas Zimmermann , Alex Deucher Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" From: Thomas Zimmermann commit a273e95721e96885971a05f1b34cb6d093904d9d upstream. Always allow switching away via vga-switcheroo if the display is uninitalized. Instead prevent switching to i915 if the device has not been initialized. This issue was introduced by commit 5df7bd130818 ("drm/i915: skip display initialization when there is no display") protected, which protects code paths from being executed on uninitialized devices. In the case of vga-switcheroo, we want to allow a switch away from i915's device. So run vga_switcheroo_process_delayed_switch() and test in the switcheroo callbacks if the i915 device is available. Fixes: 5df7bd130818 ("drm/i915: skip display initialization when there is no display") Signed-off-by: Thomas Zimmermann Reviewed-by: Alex Deucher Cc: Radhakrishna Sripada Cc: Lucas De Marchi Cc: José Roberto de Souza Cc: Jani Nikula Cc: Ville Syrjälä Cc: Jani Nikula Cc: Joonas Lahtinen Cc: Rodrigo Vivi Cc: Tvrtko Ursulin Cc: "Ville Syrjälä" Cc: Manasi Navare Cc: Stanislav Lisovskiy Cc: Imre Deak Cc: "Jouni Högander" Cc: Uma Shankar Cc: Ankit Nautiyal Cc: "Jason A. Donenfeld" Cc: Matt Roper Cc: Ramalingam C Cc: Thomas Zimmermann Cc: Andi Shyti Cc: Andrzej Hajda Cc: "José Roberto de Souza" Cc: Julia Lawall Cc: intel-gfx@lists.freedesktop.org Cc: # v5.14+ Link: https://patchwork.freedesktop.org/patch/msgid/20230116115425.13484-2-tzimmermann@suse.de Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/i915/i915_driver.c | 3 +-- drivers/gpu/drm/i915/i915_switcheroo.c | 6 +++++- 2 files changed, 6 insertions(+), 3 deletions(-) --- a/drivers/gpu/drm/i915/i915_driver.c +++ b/drivers/gpu/drm/i915/i915_driver.c @@ -1074,8 +1074,7 @@ static void i915_driver_lastclose(struct intel_fbdev_restore_mode(dev); - if (HAS_DISPLAY(i915)) - vga_switcheroo_process_delayed_switch(); + vga_switcheroo_process_delayed_switch(); } static void i915_driver_postclose(struct drm_device *dev, struct drm_file *file) --- a/drivers/gpu/drm/i915/i915_switcheroo.c +++ b/drivers/gpu/drm/i915/i915_switcheroo.c @@ -19,6 +19,10 @@ static void i915_switcheroo_set_state(st dev_err(&pdev->dev, "DRM not initialized, aborting switch.\n"); return; } + if (!HAS_DISPLAY(i915)) { + dev_err(&pdev->dev, "Device state not initialized, aborting switch.\n"); + return; + } if (state == VGA_SWITCHEROO_ON) { drm_info(&i915->drm, "switched on\n"); @@ -44,7 +48,7 @@ static bool i915_switcheroo_can_switch(s * locking inversion with the driver load path. And the access here is * completely racy anyway. So don't bother with locking for now. */ - return i915 && atomic_read(&i915->drm.open_count) == 0; + return i915 && HAS_DISPLAY(i915) && atomic_read(&i915->drm.open_count) == 0; } static const struct vga_switcheroo_client_ops i915_switcheroo_ops = {