From patchwork Mon Jul 7 07:43:51 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Aaron Lu X-Patchwork-Id: 4493231 Return-Path: X-Original-To: patchwork-intel-gfx@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id CEF779F36A for ; Mon, 7 Jul 2014 07:44:04 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 0355C20265 for ; Mon, 7 Jul 2014 07:44:04 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by mail.kernel.org (Postfix) with ESMTP id 3390620253 for ; Mon, 7 Jul 2014 07:44:03 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 777816E253; Mon, 7 Jul 2014 00:44:02 -0700 (PDT) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by gabe.freedesktop.org (Postfix) with ESMTP id 070966E253 for ; Mon, 7 Jul 2014 00:43:57 -0700 (PDT) Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga101.jf.intel.com with ESMTP; 07 Jul 2014 00:43:57 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.01,616,1400050800"; d="scan'208";a="539589045" Received: from aaronlu.sh.intel.com ([10.239.37.123]) by orsmga001.jf.intel.com with ESMTP; 07 Jul 2014 00:43:51 -0700 Message-ID: <53BA4FB7.5050701@intel.com> Date: Mon, 07 Jul 2014 15:43:51 +0800 From: Aaron Lu MIME-Version: 1.0 To: Jani Nikula , Daniel Vetter , "Rafael J. Wysocki" References: <53A8E400.5060709@intel.com> <87tx796yc5.fsf@intel.com> In-Reply-To: <87tx796yc5.fsf@intel.com> Cc: ACPI Devel Mailing List , "intel-gfx@lists.freedesktop.org" , Anton Gubarkov Subject: [Intel-gfx] [PATCH v2] drm/i915/opregion: ignore firmware requests for backlight change X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" X-Spam-Status: No, score=-4.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Some Thinkpad laptops' firmware will initiate a backlight level change request through operation region on the events of AC plug/unplug, but since we are not using firmware's interface to do the backlight setting on these affected laptops, we do not want the firmware to use some arbitrary value from its ASL variable to set the backlight level on AC plug/unplug either. Buglink: https://bugzilla.kernel.org/show_bug.cgi?id=76491 Buglink: https://bugzilla.kernel.org/show_bug.cgi?id=77091 Reported-and-tested-by: Igor Gnatenko Reported-and-tested-by: Anton Gubarkov Signed-off-by: Aaron Lu Acked-by: Jani Nikula --- v2: add a debug message when ignoring opregion request as suggested by Jani Nikula. drivers/acpi/video.c | 3 ++- drivers/gpu/drm/i915/intel_opregion.c | 9 +++++++++ include/acpi/video.h | 2 ++ 3 files changed, 13 insertions(+), 1 deletion(-) diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c index fb9ffe9adc64..cf99d6d2d491 100644 --- a/drivers/acpi/video.c +++ b/drivers/acpi/video.c @@ -241,13 +241,14 @@ static bool acpi_video_use_native_backlight(void) return use_native_backlight_dmi; } -static bool acpi_video_verify_backlight_support(void) +bool acpi_video_verify_backlight_support(void) { if (acpi_osi_is_win8() && acpi_video_use_native_backlight() && backlight_device_registered(BACKLIGHT_RAW)) return false; return acpi_video_backlight_support(); } +EXPORT_SYMBOL(acpi_video_verify_backlight_support); /* backlight device sysfs support */ static int acpi_video_get_brightness(struct backlight_device *bd) diff --git a/drivers/gpu/drm/i915/intel_opregion.c b/drivers/gpu/drm/i915/intel_opregion.c index 2e2c71fcc9ed..4f6b53998d79 100644 --- a/drivers/gpu/drm/i915/intel_opregion.c +++ b/drivers/gpu/drm/i915/intel_opregion.c @@ -403,6 +403,15 @@ static u32 asle_set_backlight(struct drm_device *dev, u32 bclp) DRM_DEBUG_DRIVER("bclp = 0x%08x\n", bclp); + /* + * If the acpi_video interface is not supposed to be used, don't + * bother processing backlight level change requests from firmware. + */ + if (!acpi_video_verify_backlight_support()) { + DRM_DEBUG_KMS("opregion backlight request ignored\n"); + return 0; + } + if (!(bclp & ASLE_BCLP_VALID)) return ASLC_BACKLIGHT_FAILED; diff --git a/include/acpi/video.h b/include/acpi/video.h index ea4c7bbded4d..92f8c4bffefb 100644 --- a/include/acpi/video.h +++ b/include/acpi/video.h @@ -22,6 +22,7 @@ extern void acpi_video_unregister(void); extern void acpi_video_unregister_backlight(void); extern int acpi_video_get_edid(struct acpi_device *device, int type, int device_id, void **edid); +extern bool acpi_video_verify_backlight_support(void); #else static inline int acpi_video_register(void) { return 0; } static inline void acpi_video_unregister(void) { return; } @@ -31,6 +32,7 @@ static inline int acpi_video_get_edid(struct acpi_device *device, int type, { return -ENODEV; } +static bool acpi_video_verify_backlight_support() { return false; } #endif #endif