From patchwork Mon Aug 2 18:58:53 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Luca Coelho X-Patchwork-Id: 491297 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 89F24C4338F for ; Mon, 2 Aug 2021 18:59:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 72AD760F9C for ; Mon, 2 Aug 2021 18:59:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231351AbhHBS7T (ORCPT ); Mon, 2 Aug 2021 14:59:19 -0400 Received: from paleale.coelho.fi ([176.9.41.70]:51036 "EHLO farmhouse.coelho.fi" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S230506AbhHBS7R (ORCPT ); Mon, 2 Aug 2021 14:59:17 -0400 Received: from 91-156-6-193.elisa-laajakaista.fi ([91.156.6.193] helo=kveik.ger.corp.intel.com) by farmhouse.coelho.fi with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94) (envelope-from ) id 1mAd9U-001ySl-Il; Mon, 02 Aug 2021 21:59:06 +0300 From: Luca Coelho To: kvalo@codeaurora.org Cc: luca@coelho.fi, linux-wireless@vger.kernel.org Date: Mon, 2 Aug 2021 21:58:53 +0300 Message-Id: X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210802185856.175567-1-luca@coelho.fi> References: <20210802185856.175567-1-luca@coelho.fi> MIME-Version: 1.0 Subject: [PATCH 07/10] iwlwifi: pcie: implement Bz reset flow Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Johannes Berg Bz device reset flow changed, now the hardware (instead of firmware) will reset the PCI bus etc., this can take up to 100ms. Signed-off-by: Johannes Berg Signed-off-by: Luca Coelho --- .../wireless/intel/iwlwifi/pcie/trans-gen2.c | 18 +++++++++++++++--- 1 file changed, 15 insertions(+), 3 deletions(-) diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/trans-gen2.c b/drivers/net/wireless/intel/iwlwifi/pcie/trans-gen2.c index fa416b42bd9d..bf0c32a74ca4 100644 --- a/drivers/net/wireless/intel/iwlwifi/pcie/trans-gen2.c +++ b/drivers/net/wireless/intel/iwlwifi/pcie/trans-gen2.c @@ -131,9 +131,21 @@ void _iwl_trans_pcie_gen2_stop_device(struct iwl_trans *trans) if (trans_pcie->is_down) return; - if (trans_pcie->fw_reset_handshake && - trans->state >= IWL_TRANS_FW_STARTED) - iwl_trans_pcie_fw_reset_handshake(trans); + if (trans->state >= IWL_TRANS_FW_STARTED) { + if (trans->trans_cfg->device_family >= IWL_DEVICE_FAMILY_BZ) { + iwl_set_bit(trans, CSR_GP_CNTRL, + CSR_GP_CNTRL_REG_FLAG_BUS_MASTER_DISABLE_REQ); + iwl_poll_bit(trans, CSR_GP_CNTRL, + CSR_GP_CNTRL_REG_FLAG_BUS_MASTER_DISABLE_STATUS, + CSR_GP_CNTRL_REG_FLAG_BUS_MASTER_DISABLE_STATUS, + 5000); + msleep(100); + iwl_set_bit(trans, CSR_GP_CNTRL, + CSR_GP_CNTRL_REG_FLAG_SW_RESET); + } else if (trans_pcie->fw_reset_handshake) { + iwl_trans_pcie_fw_reset_handshake(trans); + } + } trans_pcie->is_down = true;