From patchwork Fri Jan 8 20:54:52 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bhaumik Bhatt X-Patchwork-Id: 359133 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=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, 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 CB2E7C433E6 for ; Fri, 8 Jan 2021 20:56:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9C15723A9B for ; Fri, 8 Jan 2021 20:56:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729327AbhAHU4A (ORCPT ); Fri, 8 Jan 2021 15:56:00 -0500 Received: from m43-15.mailgun.net ([69.72.43.15]:44920 "EHLO m43-15.mailgun.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729261AbhAHU4A (ORCPT ); Fri, 8 Jan 2021 15:56:00 -0500 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1610139334; h=References: In-Reply-To: Message-Id: Date: Subject: Cc: To: From: Sender; bh=NBPiTuWGK4M7LYd3CHQzSp0Kj69Z4T+MfKL0qQmwPRc=; b=XL802GAkfrUbnWOZcgtySx+C995st3I3DI9Oli0qUy1eOveDKwI2MBhUjUFAeTnROv9DUBHB e2LQh8euAnIzfxRE59f57YLVz26rUyPfoznb6GFimFxHayrckD16IpHs9Ua1CXT9am1l4Vnp YCD70Ls/c9BvPSd6VoZu1Np9buE= X-Mailgun-Sending-Ip: 69.72.43.15 X-Mailgun-Sid: WyI1MzIzYiIsICJsaW51eC1hcm0tbXNtQHZnZXIua2VybmVsLm9yZyIsICJiZTllNGEiXQ== Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by smtp-out-n09.prod.us-west-2.postgun.com with SMTP id 5ff8c6abd84bad35476d8bf2 (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Fri, 08 Jan 2021 20:55:07 GMT Sender: bbhatt=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 3A31DC433ED; Fri, 8 Jan 2021 20:55:07 +0000 (UTC) Received: from malabar-linux.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: bbhatt) by smtp.codeaurora.org (Postfix) with ESMTPSA id 25E7EC43462; Fri, 8 Jan 2021 20:55:06 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 25E7EC43462 Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=fail smtp.mailfrom=bbhatt@codeaurora.org From: Bhaumik Bhatt To: manivannan.sadhasivam@linaro.org Cc: linux-arm-msm@vger.kernel.org, hemantk@codeaurora.org, jhugo@codeaurora.org, linux-kernel@vger.kernel.org, loic.poulain@linaro.org, Bhaumik Bhatt Subject: [PATCH v5 4/9] bus: mhi: core: Clear configuration from channel context during reset Date: Fri, 8 Jan 2021 12:54:52 -0800 Message-Id: <1610139297-36435-5-git-send-email-bbhatt@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1610139297-36435-1-git-send-email-bbhatt@codeaurora.org> References: <1610139297-36435-1-git-send-email-bbhatt@codeaurora.org> Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org When clearing up the channel context after client drivers are done using channels, the configuration is currently not being reset entirely. Ensure this is done to appropriately handle issues where clients unaware of the context state end up calling functions which expect a context. Signed-off-by: Bhaumik Bhatt Reviewed-by: Hemant Kumar Reviewed-by: Manivannan Sadhasivam --- drivers/bus/mhi/core/init.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c index 482b365..30eef19 100644 --- a/drivers/bus/mhi/core/init.c +++ b/drivers/bus/mhi/core/init.c @@ -558,6 +558,7 @@ void mhi_deinit_chan_ctxt(struct mhi_controller *mhi_cntrl, struct mhi_ring *buf_ring; struct mhi_ring *tre_ring; struct mhi_chan_ctxt *chan_ctxt; + u32 tmp; buf_ring = &mhi_chan->buf_ring; tre_ring = &mhi_chan->tre_ring; @@ -568,7 +569,19 @@ void mhi_deinit_chan_ctxt(struct mhi_controller *mhi_cntrl, vfree(buf_ring->base); buf_ring->base = tre_ring->base = NULL; + tre_ring->ctxt_wp = NULL; chan_ctxt->rbase = 0; + chan_ctxt->rlen = 0; + chan_ctxt->rp = 0; + chan_ctxt->wp = 0; + + tmp = chan_ctxt->chcfg; + tmp &= ~CHAN_CTX_CHSTATE_MASK; + tmp |= (MHI_CH_STATE_DISABLED << CHAN_CTX_CHSTATE_SHIFT); + chan_ctxt->chcfg = tmp; + + /* Update to all cores */ + smp_wmb(); } int mhi_init_chan_ctxt(struct mhi_controller *mhi_cntrl,