From patchwork Tue Apr 13 07:17:39 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Artur Petrosyan X-Patchwork-Id: 12199513 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=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 B61E0C433B4 for ; Tue, 13 Apr 2021 07:17:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8F95C613B2 for ; Tue, 13 Apr 2021 07:17:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238889AbhDMHSF (ORCPT ); Tue, 13 Apr 2021 03:18:05 -0400 Received: from smtprelay-out1.synopsys.com ([149.117.73.133]:35762 "EHLO smtprelay-out1.synopsys.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238878AbhDMHSC (ORCPT ); Tue, 13 Apr 2021 03:18:02 -0400 Received: from mailhost.synopsys.com (mdc-mailhost2.synopsys.com [10.225.0.210]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (No client certificate requested) by smtprelay-out1.synopsys.com (Postfix) with ESMTPS id A9DBB4023B; Tue, 13 Apr 2021 07:17:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=synopsys.com; s=mail; t=1618298263; bh=hI4GIsvcFvWGvoLwblHdg89O+IAB/oAS89dwlgZ0jo0=; h=Date:In-Reply-To:References:From:Subject:To:Cc:From; b=PuXnXPx7Z12++C9IYrjEfGSoSUB7xVcjeuuqWhYKXEznCG9PPUqblRArbKJsoubla 1sGDbmRYnteGLTkIXIWxTGUOcR+zXkcMVEEdCXeaD20oEPBWgxFwmxy5dMgnHu/0fr FzBFMqnU3LiTGdzbtE2Y93IBFZM3MBlhkHUgGJ/qHx9u/7H5OpjrXcn3doYwYwolDh zo2yc+ER+PZ/7hyLemuFRNbvPLlEcUzjYCrX9ZdccSaVsnRRVx6h42/CJcfd3/1h3k X9nSRpSseRarrYfkQkmUkSk+b94KLLdH5MSWFu5+T6muyMwV1JvvI/2DEkeBi4EryD mdfUqirBpe0Bw== Received: from razpc-HP (razpc-hp.internal.synopsys.com [10.116.126.207]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (No client certificate requested) by mailhost.synopsys.com (Postfix) with ESMTPSA id D3124A0094; Tue, 13 Apr 2021 07:17:40 +0000 (UTC) Received: by razpc-HP (sSMTP sendmail emulation); Tue, 13 Apr 2021 11:17:39 +0400 Date: Tue, 13 Apr 2021 11:17:39 +0400 Message-Id: <6df5d98c33407fca971d4318b1f48730130101a7.1618297800.git.Arthur.Petrosyan@synopsys.com> In-Reply-To: References: X-SNPS-Relay: synopsys.com From: Artur Petrosyan Subject: [PATCH 12/12] usb: dwc2: Add exit clock gating before removing driver To: Felipe Balbi , Greg Kroah-Hartman , Minas Harutyunyan , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org Cc: John Youn , Artur Petrosyan Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org When dwc2 core is in clock gating mode loading driver again causes driver fail. Because in that mode registers are not accessible. Added a flow of exiting clock gating mode to avoid the driver reload failure. Signed-off-by: Artur Petrosyan --- drivers/usb/dwc2/platform.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/usb/dwc2/platform.c b/drivers/usb/dwc2/platform.c index b28b8cd45799..f8b819cfa80e 100644 --- a/drivers/usb/dwc2/platform.c +++ b/drivers/usb/dwc2/platform.c @@ -326,6 +326,15 @@ static int dwc2_driver_remove(struct platform_device *dev) "exit partial_power_down failed\n"); } + /* Exit clock gating when driver is removed. */ + if (hsotg->params.power_down == DWC2_POWER_DOWN_PARAM_NONE && + hsotg->bus_suspended) { + if (dwc2_is_device_mode(hsotg)) + dwc2_gadget_exit_clock_gating(hsotg, 0); + else + dwc2_host_exit_clock_gating(hsotg, 0); + } + dwc2_debugfs_exit(hsotg); if (hsotg->hcd_enabled) dwc2_hcd_remove(hsotg);