From patchwork Fri Sep 29 11:57:15 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Ilpo_J=C3=A4rvinen?= X-Patchwork-Id: 13404152 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 161A3E810D5 for ; Fri, 29 Sep 2023 11:58:10 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 7B47110E11B; Fri, 29 Sep 2023 11:58:09 +0000 (UTC) Received: from mgamail.intel.com (mgamail.intel.com [192.55.52.88]) by gabe.freedesktop.org (Postfix) with ESMTPS id 84B6410E11B; Fri, 29 Sep 2023 11:58:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1695988687; x=1727524687; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=gwM5fnXuG8powd+ajq+cI+5GyVGOVUj5BEzCq+gdTz4=; b=U9ymXTRjb58s1kDbPX2wMtSZlajBOmEYi9j8bh1ZV+qlXQthQLcF0sPB aHyEieTKVioIbKKa8FcUh2fiQpfDT1KE+3ObOHkh7zN2rew/IbuvsuutW x0p6O4f4kNg9KWP6zPcCqkvX7E67QW/xlde2IvX4Bd1SfTTx0a2WRfVDi aAiHrVgXMPYaXqUQQ/vRv+lrBB8njKHxcFTYYqsRoJdQ++wcmNpFPp4Og WdFU46tiqMEVndqJh8gsv7doCeyjFr2yVCM8EPGvmpzYBnTB3b+R7O34Y 2mYgY5J/lj+yKQPiCWLnRCwwvZoeDgRT+NMWa5cMkFGoQHeN46GISfcUl g==; X-IronPort-AV: E=McAfee;i="6600,9927,10847"; a="413185345" X-IronPort-AV: E=Sophos;i="6.03,187,1694761200"; d="scan'208";a="413185345" Received: from fmviesa001.fm.intel.com ([10.60.135.141]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 29 Sep 2023 04:58:06 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.03,187,1694761200"; d="scan'208";a="838607" Received: from valeks2x-mobl.ger.corp.intel.com (HELO localhost) ([10.252.53.242]) by smtpauth.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 29 Sep 2023 04:58:00 -0700 From: =?utf-8?q?Ilpo_J=C3=A4rvinen?= To: linux-pci@vger.kernel.org, Bjorn Helgaas , Lorenzo Pieralisi , Rob Herring , =?utf-8?q?Krzysztof_Wilczy=C5=84ski?= , Lukas Wunner , Alexandru Gagniuc , Krishna chaitanya chundru , Srinivas Pandruvada , "Rafael J . Wysocki" , linux-pm@vger.kernel.org, Alex Deucher , =?utf-8?q?Christian_K=C3=B6nig?= , "Pan, Xinhui" , David Airlie , Daniel Vetter , amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 02/10] drm/radeon: Use RMW accessors for changing LNKCTL2 Date: Fri, 29 Sep 2023 14:57:15 +0300 Message-Id: <20230929115723.7864-3-ilpo.jarvinen@linux.intel.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20230929115723.7864-1-ilpo.jarvinen@linux.intel.com> References: <20230929115723.7864-1-ilpo.jarvinen@linux.intel.com> 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: =?utf-8?q?Ilpo_J=C3=A4rvinen?= , Zhang Rui , Daniel Lezcano , Amit Kucheria Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Don't assume that only the driver would be accessing LNKCTL2. In the case of upstream (parent), the driver does not even own the device it's changing the registers for. Use RMW capability accessors which do proper locking to avoid losing concurrent updates to the register value. This change is also useful as a cleanup. Suggested-by: Lukas Wunner Signed-off-by: Ilpo Järvinen --- drivers/gpu/drm/radeon/cik.c | 40 ++++++++++++++---------------------- drivers/gpu/drm/radeon/si.c | 40 ++++++++++++++---------------------- 2 files changed, 30 insertions(+), 50 deletions(-) diff --git a/drivers/gpu/drm/radeon/cik.c b/drivers/gpu/drm/radeon/cik.c index 10be30366c2b..b5e96a8fc2c1 100644 --- a/drivers/gpu/drm/radeon/cik.c +++ b/drivers/gpu/drm/radeon/cik.c @@ -9592,28 +9592,18 @@ static void cik_pcie_gen3_enable(struct radeon_device *rdev) PCI_EXP_LNKCTL_HAWD); /* linkctl2 */ - pcie_capability_read_word(root, PCI_EXP_LNKCTL2, - &tmp16); - tmp16 &= ~(PCI_EXP_LNKCTL2_ENTER_COMP | - PCI_EXP_LNKCTL2_TX_MARGIN); - tmp16 |= (bridge_cfg2 & - (PCI_EXP_LNKCTL2_ENTER_COMP | - PCI_EXP_LNKCTL2_TX_MARGIN)); - pcie_capability_write_word(root, - PCI_EXP_LNKCTL2, - tmp16); - - pcie_capability_read_word(rdev->pdev, - PCI_EXP_LNKCTL2, - &tmp16); - tmp16 &= ~(PCI_EXP_LNKCTL2_ENTER_COMP | - PCI_EXP_LNKCTL2_TX_MARGIN); - tmp16 |= (gpu_cfg2 & - (PCI_EXP_LNKCTL2_ENTER_COMP | - PCI_EXP_LNKCTL2_TX_MARGIN)); - pcie_capability_write_word(rdev->pdev, - PCI_EXP_LNKCTL2, - tmp16); + pcie_capability_clear_and_set_word(root, PCI_EXP_LNKCTL2, + PCI_EXP_LNKCTL2_ENTER_COMP | + PCI_EXP_LNKCTL2_TX_MARGIN, + bridge_cfg2 | + (PCI_EXP_LNKCTL2_ENTER_COMP | + PCI_EXP_LNKCTL2_TX_MARGIN)); + pcie_capability_clear_and_set_word(rdev->pdev, PCI_EXP_LNKCTL2, + PCI_EXP_LNKCTL2_ENTER_COMP | + PCI_EXP_LNKCTL2_TX_MARGIN, + gpu_cfg2 | + (PCI_EXP_LNKCTL2_ENTER_COMP | + PCI_EXP_LNKCTL2_TX_MARGIN)); tmp = RREG32_PCIE_PORT(PCIE_LC_CNTL4); tmp &= ~LC_SET_QUIESCE; @@ -9627,15 +9617,15 @@ static void cik_pcie_gen3_enable(struct radeon_device *rdev) speed_cntl &= ~LC_FORCE_DIS_SW_SPEED_CHANGE; WREG32_PCIE_PORT(PCIE_LC_SPEED_CNTL, speed_cntl); - pcie_capability_read_word(rdev->pdev, PCI_EXP_LNKCTL2, &tmp16); - tmp16 &= ~PCI_EXP_LNKCTL2_TLS; + tmp16 = 0; if (speed_cap == PCIE_SPEED_8_0GT) tmp16 |= PCI_EXP_LNKCTL2_TLS_8_0GT; /* gen3 */ else if (speed_cap == PCIE_SPEED_5_0GT) tmp16 |= PCI_EXP_LNKCTL2_TLS_5_0GT; /* gen2 */ else tmp16 |= PCI_EXP_LNKCTL2_TLS_2_5GT; /* gen1 */ - pcie_capability_write_word(rdev->pdev, PCI_EXP_LNKCTL2, tmp16); + pcie_capability_clear_and_set_word(rdev->pdev, PCI_EXP_LNKCTL2, + PCI_EXP_LNKCTL2_TLS, tmp16); speed_cntl = RREG32_PCIE_PORT(PCIE_LC_SPEED_CNTL); speed_cntl |= LC_INITIATE_LINK_SPEED_CHANGE; diff --git a/drivers/gpu/drm/radeon/si.c b/drivers/gpu/drm/radeon/si.c index a91012447b56..32871ca09a0f 100644 --- a/drivers/gpu/drm/radeon/si.c +++ b/drivers/gpu/drm/radeon/si.c @@ -7189,28 +7189,18 @@ static void si_pcie_gen3_enable(struct radeon_device *rdev) PCI_EXP_LNKCTL_HAWD); /* linkctl2 */ - pcie_capability_read_word(root, PCI_EXP_LNKCTL2, - &tmp16); - tmp16 &= ~(PCI_EXP_LNKCTL2_ENTER_COMP | - PCI_EXP_LNKCTL2_TX_MARGIN); - tmp16 |= (bridge_cfg2 & - (PCI_EXP_LNKCTL2_ENTER_COMP | - PCI_EXP_LNKCTL2_TX_MARGIN)); - pcie_capability_write_word(root, - PCI_EXP_LNKCTL2, - tmp16); - - pcie_capability_read_word(rdev->pdev, - PCI_EXP_LNKCTL2, - &tmp16); - tmp16 &= ~(PCI_EXP_LNKCTL2_ENTER_COMP | - PCI_EXP_LNKCTL2_TX_MARGIN); - tmp16 |= (gpu_cfg2 & - (PCI_EXP_LNKCTL2_ENTER_COMP | - PCI_EXP_LNKCTL2_TX_MARGIN)); - pcie_capability_write_word(rdev->pdev, - PCI_EXP_LNKCTL2, - tmp16); + pcie_capability_clear_and_set_word(root, PCI_EXP_LNKCTL2, + PCI_EXP_LNKCTL2_ENTER_COMP | + PCI_EXP_LNKCTL2_TX_MARGIN, + bridge_cfg2 & + (PCI_EXP_LNKCTL2_ENTER_COMP | + PCI_EXP_LNKCTL2_TX_MARGIN)); + pcie_capability_clear_and_set_word(rdev->pdev, PCI_EXP_LNKCTL2, + PCI_EXP_LNKCTL2_ENTER_COMP | + PCI_EXP_LNKCTL2_TX_MARGIN, + gpu_cfg2 & + (PCI_EXP_LNKCTL2_ENTER_COMP | + PCI_EXP_LNKCTL2_TX_MARGIN)); tmp = RREG32_PCIE_PORT(PCIE_LC_CNTL4); tmp &= ~LC_SET_QUIESCE; @@ -7224,15 +7214,15 @@ static void si_pcie_gen3_enable(struct radeon_device *rdev) speed_cntl &= ~LC_FORCE_DIS_SW_SPEED_CHANGE; WREG32_PCIE_PORT(PCIE_LC_SPEED_CNTL, speed_cntl); - pcie_capability_read_word(rdev->pdev, PCI_EXP_LNKCTL2, &tmp16); - tmp16 &= ~PCI_EXP_LNKCTL2_TLS; + tmp16 = 0; if (speed_cap == PCIE_SPEED_8_0GT) tmp16 |= PCI_EXP_LNKCTL2_TLS_8_0GT; /* gen3 */ else if (speed_cap == PCIE_SPEED_5_0GT) tmp16 |= PCI_EXP_LNKCTL2_TLS_5_0GT; /* gen2 */ else tmp16 |= PCI_EXP_LNKCTL2_TLS_2_5GT; /* gen1 */ - pcie_capability_write_word(rdev->pdev, PCI_EXP_LNKCTL2, tmp16); + pcie_capability_clear_and_set_word(rdev->pdev, PCI_EXP_LNKCTL2, + PCI_EXP_LNKCTL2_TLS, tmp16); speed_cntl = RREG32_PCIE_PORT(PCIE_LC_SPEED_CNTL); speed_cntl |= LC_INITIATE_LINK_SPEED_CHANGE;