From patchwork Wed Dec 2 23:40:32 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bhaumik Bhatt X-Patchwork-Id: 11947329 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,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 53108C64E7C for ; Wed, 2 Dec 2020 23:41:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 00E86221EB for ; Wed, 2 Dec 2020 23:41:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727981AbgLBXlm (ORCPT ); Wed, 2 Dec 2020 18:41:42 -0500 Received: from a2.mail.mailgun.net ([198.61.254.61]:59818 "EHLO a2.mail.mailgun.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727570AbgLBXll (ORCPT ); Wed, 2 Dec 2020 18:41:41 -0500 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1606952476; h=References: In-Reply-To: Message-Id: Date: Subject: Cc: To: From: Sender; bh=gtw0x40aTebDqSdfGKNWiZTA57lqz67IWj7R8YJnfI4=; b=BjbXEFjH96FLG2bie2DIZGKp5svL1VeE3A633suwvL+F+nKlNtwgsH6zsD/rPoLMk+/60u96 2TBtywbMEQ5mabwV5XNmK6af8i+VJJbghhB8C4vVcQu8+TA2Pn24rke+bDZExoUGViJQiRlD HxLzqmJr8zzEZN2X7edAn/IFO0E= X-Mailgun-Sending-Ip: 198.61.254.61 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-n06.prod.us-east-1.postgun.com with SMTP id 5fc82602f2eedd90842bcd1d (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Wed, 02 Dec 2020 23:40:50 GMT Sender: bbhatt=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id B56A7C43462; Wed, 2 Dec 2020 23:40:49 +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 EEC58C43460; Wed, 2 Dec 2020 23:40:48 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org EEC58C43460 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, hemantk@codeaurora.org Cc: linux-arm-msm@vger.kernel.org, loic.poulain@linaro.org, jhugo@codeaurora.org, linux-kernel@vger.kernel.org, Bhaumik Bhatt Subject: [PATCH v3 1/7] bus: mhi: core: Allow receiving a STOP channel command response Date: Wed, 2 Dec 2020 15:40:32 -0800 Message-Id: <1606952438-15321-2-git-send-email-bbhatt@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1606952438-15321-1-git-send-email-bbhatt@codeaurora.org> References: <1606952438-15321-1-git-send-email-bbhatt@codeaurora.org> Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Add support to receive the response to a STOP channel command to the MHI bus. If a client would like to STOP a channel instead of issuing a RESET to it, this would provide support for it. Signed-off-by: Bhaumik Bhatt --- drivers/bus/mhi/core/main.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c index 702c31b..a7bb8a7 100644 --- a/drivers/bus/mhi/core/main.c +++ b/drivers/bus/mhi/core/main.c @@ -1193,6 +1193,11 @@ int mhi_send_cmd(struct mhi_controller *mhi_cntrl, cmd_tre->dword[0] = MHI_TRE_CMD_RESET_DWORD0; cmd_tre->dword[1] = MHI_TRE_CMD_RESET_DWORD1(chan); break; + case MHI_CMD_STOP_CHAN: + cmd_tre->ptr = MHI_TRE_CMD_STOP_PTR; + cmd_tre->dword[0] = MHI_TRE_CMD_STOP_DWORD0; + cmd_tre->dword[1] = MHI_TRE_CMD_STOP_DWORD1(chan); + break; case MHI_CMD_START_CHAN: cmd_tre->ptr = MHI_TRE_CMD_START_PTR; cmd_tre->dword[0] = MHI_TRE_CMD_START_DWORD0; From patchwork Wed Dec 2 23:40:33 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bhaumik Bhatt X-Patchwork-Id: 11947333 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,USER_AGENT_GIT autolearn=unavailable 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 9A55EC83017 for ; Wed, 2 Dec 2020 23:41:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 49B4B21D7A for ; Wed, 2 Dec 2020 23:41:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728364AbgLBXlv (ORCPT ); Wed, 2 Dec 2020 18:41:51 -0500 Received: from a2.mail.mailgun.net ([198.61.254.61]:57705 "EHLO a2.mail.mailgun.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728815AbgLBXlq (ORCPT ); Wed, 2 Dec 2020 18:41:46 -0500 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1606952487; h=References: In-Reply-To: Message-Id: Date: Subject: Cc: To: From: Sender; bh=/zZ9PrMUSfJKaZKhW4LSC93iI89BZsWElZ7hzgxB2dg=; b=pmF5DGReFPKiqSTobSRUQYwrz2GkyJKFZSZMuk0ea1I8Yh7Dj8U7pafHkY6aIWYc2FPjisH5 DfOr95pXKEopck+iravv9LCkbDl8rXA9wLu3J74v9eeIR/OiFROEiWxu3ok/WReJX7dwULZR u8PcanH9FcHDiVUa6uqJd+ED9CM= X-Mailgun-Sending-Ip: 198.61.254.61 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-n03.prod.us-east-1.postgun.com with SMTP id 5fc82602a5d4da3a6c5b027c (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Wed, 02 Dec 2020 23:40:50 GMT Sender: bbhatt=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 40543C433ED; Wed, 2 Dec 2020 23:40:50 +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 8C24FC43464; Wed, 2 Dec 2020 23:40:49 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 8C24FC43464 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, hemantk@codeaurora.org Cc: linux-arm-msm@vger.kernel.org, loic.poulain@linaro.org, jhugo@codeaurora.org, linux-kernel@vger.kernel.org, Bhaumik Bhatt Subject: [PATCH v3 2/7] bus: mhi: core: Allow channel to be disabled from stopped state Date: Wed, 2 Dec 2020 15:40:33 -0800 Message-Id: <1606952438-15321-3-git-send-email-bbhatt@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1606952438-15321-1-git-send-email-bbhatt@codeaurora.org> References: <1606952438-15321-1-git-send-email-bbhatt@codeaurora.org> Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org If a channel was explicitly stopped but not reset, allow it to move to a disabled state so the channel context can be cleaned up. As the channel remained in a stopped state, its context was not reset and cleared, which needs to be done if a client driver module is unloaded or a device crash occurs. Signed-off-by: Bhaumik Bhatt Reviewed-by: Hemant Kumar --- drivers/bus/mhi/core/init.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c index f0697f4..e7b9a90 100644 --- a/drivers/bus/mhi/core/init.c +++ b/drivers/bus/mhi/core/init.c @@ -1288,7 +1288,8 @@ static int mhi_driver_remove(struct device *dev) mutex_lock(&mhi_chan->mutex); - if (ch_state[dir] == MHI_CH_STATE_ENABLED && + if ((ch_state[dir] == MHI_CH_STATE_ENABLED || + ch_state[dir] == MHI_CH_STATE_STOP) && !mhi_chan->offload_ch) mhi_deinit_chan_ctxt(mhi_cntrl, mhi_chan); From patchwork Wed Dec 2 23:40:34 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bhaumik Bhatt X-Patchwork-Id: 11947337 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,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 D0ECEC83019 for ; Wed, 2 Dec 2020 23:41:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A441721D91 for ; Wed, 2 Dec 2020 23:41:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729159AbgLBXl6 (ORCPT ); Wed, 2 Dec 2020 18:41:58 -0500 Received: from m42-5.mailgun.net ([69.72.42.5]:30048 "EHLO m42-5.mailgun.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727566AbgLBXl6 (ORCPT ); Wed, 2 Dec 2020 18:41:58 -0500 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1606952495; h=References: In-Reply-To: Message-Id: Date: Subject: Cc: To: From: Sender; bh=+n8ckVIVw/JBsQq/htLf2DKF7mcizTpR/s2y/lQWJk8=; b=jPuh5nzQcFD7CTYgzM7m+IBN2t1Ap2MxsJ74nV5wX7uEhjCMLNu+YiH2hnq0clCiBWjqA3/c 0+yTqbw9i0yCWg128XVQ5ve7XiR8YGDdZnSIfQw33HRDcx+Cm9vT14T+wThC2wCzdK2+10D9 dLizOCnK5cPo4GhmyXus31Nt5yQ= X-Mailgun-Sending-Ip: 69.72.42.5 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-n03.prod.us-west-2.postgun.com with SMTP id 5fc82603f653ea0cd800ea2d (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Wed, 02 Dec 2020 23:40:51 GMT Sender: bbhatt=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 26F2DC43462; Wed, 2 Dec 2020 23:40:51 +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 28F8EC433C6; Wed, 2 Dec 2020 23:40:50 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 28F8EC433C6 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, hemantk@codeaurora.org Cc: linux-arm-msm@vger.kernel.org, loic.poulain@linaro.org, jhugo@codeaurora.org, linux-kernel@vger.kernel.org, Bhaumik Bhatt Subject: [PATCH v3 3/7] bus: mhi: core: Improvements to the channel handling state machine Date: Wed, 2 Dec 2020 15:40:34 -0800 Message-Id: <1606952438-15321-4-git-send-email-bbhatt@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1606952438-15321-1-git-send-email-bbhatt@codeaurora.org> References: <1606952438-15321-1-git-send-email-bbhatt@codeaurora.org> Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Add support to enable sending the stop channel command and improve the channel handling state machine such that all commands go through a common function. This can help ensure that the state machine is not violated in any way and adheres to the MHI specification. Signed-off-by: Bhaumik Bhatt Reviewed-by: Hemant Kumar --- drivers/bus/mhi/core/init.c | 6 ++ drivers/bus/mhi/core/internal.h | 12 +++ drivers/bus/mhi/core/main.c | 166 +++++++++++++++++++++++----------------- 3 files changed, 114 insertions(+), 70 deletions(-) diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c index e7b9a90..4f6d69c 100644 --- a/drivers/bus/mhi/core/init.c +++ b/drivers/bus/mhi/core/init.c @@ -54,6 +54,12 @@ const char * const mhi_state_str[MHI_STATE_MAX] = { [MHI_STATE_SYS_ERR] = "SYS_ERR", }; +const char * const mhi_ch_state_type_str[MHI_CH_STATE_TYPE_MAX] = { + [MHI_CH_STATE_TYPE_RESET] = "RESET", + [MHI_CH_STATE_TYPE_STOP] = "STOP", + [MHI_CH_STATE_TYPE_START] = "START", +}; + static const char * const mhi_pm_state_str[] = { [MHI_PM_STATE_DISABLE] = "DISABLE", [MHI_PM_STATE_POR] = "POR", diff --git a/drivers/bus/mhi/core/internal.h b/drivers/bus/mhi/core/internal.h index 6f80ec3..251d7d7 100644 --- a/drivers/bus/mhi/core/internal.h +++ b/drivers/bus/mhi/core/internal.h @@ -369,6 +369,18 @@ enum mhi_ch_state { MHI_CH_STATE_ERROR = 0x5, }; +enum mhi_ch_state_type { + MHI_CH_STATE_TYPE_RESET, + MHI_CH_STATE_TYPE_STOP, + MHI_CH_STATE_TYPE_START, + MHI_CH_STATE_TYPE_MAX, +}; + +extern const char * const mhi_ch_state_type_str[MHI_CH_STATE_TYPE_MAX]; +#define TO_CH_STATE_TYPE_STR(state) (((state) >= MHI_CH_STATE_TYPE_MAX) ? \ + "INVALID_STATE" : \ + mhi_ch_state_type_str[state]) + #define MHI_INVALID_BRSTMODE(mode) (mode != MHI_DB_BRST_DISABLE && \ mode != MHI_DB_BRST_ENABLE) diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c index a7bb8a7..4cc5ced 100644 --- a/drivers/bus/mhi/core/main.c +++ b/drivers/bus/mhi/core/main.c @@ -1219,56 +1219,118 @@ int mhi_send_cmd(struct mhi_controller *mhi_cntrl, return 0; } -static void __mhi_unprepare_channel(struct mhi_controller *mhi_cntrl, - struct mhi_chan *mhi_chan) +static int mhi_update_channel_state(struct mhi_controller *mhi_cntrl, + struct mhi_chan *mhi_chan, + enum mhi_ch_state_type to_state) { - int ret; struct device *dev = &mhi_cntrl->mhi_dev->dev; + enum mhi_cmd_type cmd = MHI_CMD_NOP; + int ret = -EIO; + + dev_dbg(dev, "Updating channel %s(%d) state to: %s\n", mhi_chan->name, + mhi_chan->chan, TO_CH_STATE_TYPE_STR(to_state)); + + switch (to_state) { + case MHI_CH_STATE_TYPE_RESET: + write_lock_irq(&mhi_chan->lock); + if (mhi_chan->ch_state != MHI_CH_STATE_STOP && + mhi_chan->ch_state != MHI_CH_STATE_ENABLED && + mhi_chan->ch_state != MHI_CH_STATE_SUSPENDED) { + write_unlock_irq(&mhi_chan->lock); + goto exit_invalid_state; + } + mhi_chan->ch_state = MHI_CH_STATE_DISABLED; + write_unlock_irq(&mhi_chan->lock); - dev_dbg(dev, "Entered: unprepare channel:%d\n", mhi_chan->chan); + cmd = MHI_CMD_RESET_CHAN; + break; + case MHI_CH_STATE_TYPE_STOP: + if (mhi_chan->ch_state != MHI_CH_STATE_ENABLED) + goto exit_invalid_state; - /* no more processing events for this channel */ - mutex_lock(&mhi_chan->mutex); - write_lock_irq(&mhi_chan->lock); - if (mhi_chan->ch_state != MHI_CH_STATE_ENABLED && - mhi_chan->ch_state != MHI_CH_STATE_SUSPENDED) { - write_unlock_irq(&mhi_chan->lock); - mutex_unlock(&mhi_chan->mutex); - return; + cmd = MHI_CMD_STOP_CHAN; + break; + case MHI_CH_STATE_TYPE_START: + if (mhi_chan->ch_state != MHI_CH_STATE_STOP && + mhi_chan->ch_state != MHI_CH_STATE_DISABLED) + goto exit_invalid_state; + + cmd = MHI_CMD_START_CHAN; + break; + default: + goto exit_invalid_state; } - mhi_chan->ch_state = MHI_CH_STATE_DISABLED; - write_unlock_irq(&mhi_chan->lock); + /* bring host and device out of suspended states */ + ret = mhi_device_get_sync(mhi_cntrl->mhi_dev); + if (ret) + return ret; + mhi_cntrl->runtime_get(mhi_cntrl); reinit_completion(&mhi_chan->completion); - read_lock_bh(&mhi_cntrl->pm_lock); - if (MHI_PM_IN_ERROR_STATE(mhi_cntrl->pm_state)) { - read_unlock_bh(&mhi_cntrl->pm_lock); - goto error_invalid_state; + ret = mhi_send_cmd(mhi_cntrl, mhi_chan, cmd); + if (ret) { + dev_err(dev, "Failed to send %s(%d) %s command\n", + mhi_chan->name, mhi_chan->chan, + TO_CH_STATE_TYPE_STR(to_state)); + goto exit_command_failure; } - mhi_cntrl->wake_toggle(mhi_cntrl); - read_unlock_bh(&mhi_cntrl->pm_lock); + ret = wait_for_completion_timeout(&mhi_chan->completion, + msecs_to_jiffies(mhi_cntrl->timeout_ms)); + if (!ret || mhi_chan->ccs != MHI_EV_CC_SUCCESS) { + dev_err(dev, "Failed to receive %s(%d) %s command completion\n", + mhi_chan->name, mhi_chan->chan, + TO_CH_STATE_TYPE_STR(to_state)); + ret = -EIO; + goto exit_command_failure; + } - mhi_cntrl->runtime_get(mhi_cntrl); + ret = 0; + + if (to_state != MHI_CH_STATE_TYPE_RESET) { + write_lock_irq(&mhi_chan->lock); + mhi_chan->ch_state = (to_state == MHI_CH_STATE_TYPE_START) ? + MHI_CH_STATE_ENABLED : MHI_CH_STATE_STOP; + write_unlock_irq(&mhi_chan->lock); + } + + dev_dbg(dev, "Channel %s(%d) state change to %s successful\n", + mhi_chan->name, mhi_chan->chan, TO_CH_STATE_TYPE_STR(to_state)); + +exit_command_failure: mhi_cntrl->runtime_put(mhi_cntrl); - ret = mhi_send_cmd(mhi_cntrl, mhi_chan, MHI_CMD_RESET_CHAN); - if (ret) - goto error_invalid_state; + mhi_device_put(mhi_cntrl->mhi_dev); - /* even if it fails we will still reset */ - ret = wait_for_completion_timeout(&mhi_chan->completion, - msecs_to_jiffies(mhi_cntrl->timeout_ms)); - if (!ret || mhi_chan->ccs != MHI_EV_CC_SUCCESS) - dev_err(dev, - "Failed to receive cmd completion, still resetting\n"); + return ret; + +exit_invalid_state: + dev_err(dev, "Channel %s(%d) update to %s not allowed\n", + mhi_chan->name, mhi_chan->chan, TO_CH_STATE_TYPE_STR(to_state)); + + return -EINVAL; +} + +static void __mhi_unprepare_channel(struct mhi_controller *mhi_cntrl, + struct mhi_chan *mhi_chan) +{ + int ret; + struct device *dev = &mhi_cntrl->mhi_dev->dev; + + /* no more processing events for this channel */ + mutex_lock(&mhi_chan->mutex); + + ret = mhi_update_channel_state(mhi_cntrl, mhi_chan, + MHI_CH_STATE_TYPE_RESET); + if (ret) + dev_err(dev, "Failed to reset channel, still resetting\n"); -error_invalid_state: if (!mhi_chan->offload_ch) { mhi_reset_chan(mhi_cntrl, mhi_chan); mhi_deinit_chan_ctxt(mhi_cntrl, mhi_chan); } - dev_dbg(dev, "chan:%d successfully resetted\n", mhi_chan->chan); + dev_dbg(dev, "chan:%d successfully reset\n", mhi_chan->chan); + mutex_unlock(&mhi_chan->mutex); } @@ -1278,8 +1340,6 @@ int mhi_prepare_channel(struct mhi_controller *mhi_cntrl, int ret = 0; struct device *dev = &mhi_cntrl->mhi_dev->dev; - dev_dbg(dev, "Preparing channel: %d\n", mhi_chan->chan); - if (!(BIT(mhi_cntrl->ee) & mhi_chan->ee_mask)) { dev_err(dev, "Current EE: %s Required EE Mask: 0x%x for chan: %s\n", @@ -1290,14 +1350,6 @@ int mhi_prepare_channel(struct mhi_controller *mhi_cntrl, mutex_lock(&mhi_chan->mutex); - /* If channel is not in disable state, do not allow it to start */ - if (mhi_chan->ch_state != MHI_CH_STATE_DISABLED) { - ret = -EIO; - dev_dbg(dev, "channel: %d is not in disabled state\n", - mhi_chan->chan); - goto error_init_chan; - } - /* Check of client manages channel context for offload channels */ if (!mhi_chan->offload_ch) { ret = mhi_init_chan_ctxt(mhi_cntrl, mhi_chan); @@ -1305,34 +1357,11 @@ int mhi_prepare_channel(struct mhi_controller *mhi_cntrl, goto error_init_chan; } - reinit_completion(&mhi_chan->completion); - read_lock_bh(&mhi_cntrl->pm_lock); - if (MHI_PM_IN_ERROR_STATE(mhi_cntrl->pm_state)) { - read_unlock_bh(&mhi_cntrl->pm_lock); - ret = -EIO; - goto error_pm_state; - } - - mhi_cntrl->wake_toggle(mhi_cntrl); - read_unlock_bh(&mhi_cntrl->pm_lock); - mhi_cntrl->runtime_get(mhi_cntrl); - mhi_cntrl->runtime_put(mhi_cntrl); - - ret = mhi_send_cmd(mhi_cntrl, mhi_chan, MHI_CMD_START_CHAN); + ret = mhi_update_channel_state(mhi_cntrl, mhi_chan, + MHI_CH_STATE_TYPE_START); if (ret) goto error_pm_state; - ret = wait_for_completion_timeout(&mhi_chan->completion, - msecs_to_jiffies(mhi_cntrl->timeout_ms)); - if (!ret || mhi_chan->ccs != MHI_EV_CC_SUCCESS) { - ret = -EIO; - goto error_pm_state; - } - - write_lock_irq(&mhi_chan->lock); - mhi_chan->ch_state = MHI_CH_STATE_ENABLED; - write_unlock_irq(&mhi_chan->lock); - /* Pre-allocate buffer for xfer ring */ if (mhi_chan->pre_alloc) { int nr_el = get_nr_avail_ring_elements(mhi_cntrl, @@ -1370,9 +1399,6 @@ int mhi_prepare_channel(struct mhi_controller *mhi_cntrl, mutex_unlock(&mhi_chan->mutex); - dev_dbg(dev, "Chan: %d successfully moved to start state\n", - mhi_chan->chan); - return 0; error_pm_state: From patchwork Wed Dec 2 23:40:35 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bhaumik Bhatt X-Patchwork-Id: 11947343 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,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=unavailable 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 052AFC64E7B for ; Wed, 2 Dec 2020 23:42:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AE24B22252 for ; Wed, 2 Dec 2020 23:42:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387547AbgLBXmJ (ORCPT ); Wed, 2 Dec 2020 18:42:09 -0500 Received: from m42-5.mailgun.net ([69.72.42.5]:18552 "EHLO m42-5.mailgun.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729191AbgLBXmI (ORCPT ); Wed, 2 Dec 2020 18:42:08 -0500 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1606952509; h=References: In-Reply-To: Message-Id: Date: Subject: Cc: To: From: Sender; bh=oy/aThwyI7egpnediO0HIoxBAAw1Dyjel8E7NnExrYY=; b=dNkWm1p79XN4fzStzYr/kQJwC9XcZckE1yM69Wc2w3lSas+LY1+S1iJ1QgnLlVpgCm3ZsCka f2pp7BMuhiNIcNpe+Q5ofNHqxC2I/E6wXP7CrF4sQ0WuLisLnekeQ2r/NnM80axMpGiryPSW 5vAYxs/EwpeKTKBjlzXSJvymDZI= X-Mailgun-Sending-Ip: 69.72.42.5 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-n10.prod.us-west-2.postgun.com with SMTP id 5fc826030b1f6587dd17d757 (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Wed, 02 Dec 2020 23:40:52 GMT Sender: bbhatt=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id D9C3AC43460; Wed, 2 Dec 2020 23:40:51 +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 BA524C43463; Wed, 2 Dec 2020 23:40:50 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org BA524C43463 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, hemantk@codeaurora.org Cc: linux-arm-msm@vger.kernel.org, loic.poulain@linaro.org, jhugo@codeaurora.org, linux-kernel@vger.kernel.org, Bhaumik Bhatt Subject: [PATCH v3 4/7] bus: mhi: core: Add support to stop or start channel data transfers Date: Wed, 2 Dec 2020 15:40:35 -0800 Message-Id: <1606952438-15321-5-git-send-email-bbhatt@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1606952438-15321-1-git-send-email-bbhatt@codeaurora.org> References: <1606952438-15321-1-git-send-email-bbhatt@codeaurora.org> Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Some MHI client drivers may want to request a pause or halt of data transfer activity on their channels. Support for this does not exist and must be introduced, wherein the channel context is not reset or cleared but only the STOP channel command is issued. This would need to be paired with an API that allows resuming the data transfer activity on channels by use of the START channel command. This API assumes that the context information is already setup. Enable this using two new APIs, mhi_start_transfer() and mhi_stop_transfer(). Signed-off-by: Bhaumik Bhatt --- drivers/bus/mhi/core/main.c | 41 +++++++++++++++++++++++++++++++++++++++++ include/linux/mhi.h | 19 +++++++++++++++++++ 2 files changed, 60 insertions(+) diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c index 4cc5ced..2e4b34a 100644 --- a/drivers/bus/mhi/core/main.c +++ b/drivers/bus/mhi/core/main.c @@ -1552,6 +1552,47 @@ void mhi_unprepare_from_transfer(struct mhi_device *mhi_dev) } EXPORT_SYMBOL_GPL(mhi_unprepare_from_transfer); +static int mhi_update_transfer_state(struct mhi_device *mhi_dev, + enum mhi_ch_state_type to_state) +{ + struct mhi_controller *mhi_cntrl = mhi_dev->mhi_cntrl; + struct mhi_chan *mhi_chan; + int dir, ret; + + for (dir = 0; dir < 2; dir++) { + mhi_chan = dir ? mhi_dev->ul_chan : mhi_dev->dl_chan; + + if (!mhi_chan) + continue; + + /* + * Bail out if one of the channels fail as client will reset + * both upon failure + */ + mutex_lock(&mhi_chan->mutex); + ret = mhi_update_channel_state(mhi_cntrl, mhi_chan, to_state); + if (ret) { + mutex_unlock(&mhi_chan->mutex); + return ret; + } + mutex_unlock(&mhi_chan->mutex); + } + + return 0; +} + +int mhi_stop_transfer(struct mhi_device *mhi_dev) +{ + return mhi_update_transfer_state(mhi_dev, MHI_CH_STATE_TYPE_STOP); +} +EXPORT_SYMBOL_GPL(mhi_stop_transfer); + +int mhi_start_transfer(struct mhi_device *mhi_dev) +{ + return mhi_update_transfer_state(mhi_dev, MHI_CH_STATE_TYPE_START); +} +EXPORT_SYMBOL_GPL(mhi_start_transfer); + int mhi_poll(struct mhi_device *mhi_dev, u32 budget) { struct mhi_controller *mhi_cntrl = mhi_dev->mhi_cntrl; diff --git a/include/linux/mhi.h b/include/linux/mhi.h index aa9757e..35779a0 100644 --- a/include/linux/mhi.h +++ b/include/linux/mhi.h @@ -704,6 +704,25 @@ int mhi_prepare_for_transfer(struct mhi_device *mhi_dev); void mhi_unprepare_from_transfer(struct mhi_device *mhi_dev); /** + * mhi_stop_transfer - Pauses ongoing channel activity by issuing the STOP + * channel command to both UL and DL channels. This command + * does not reset the channel context and the client drivers + * can issue mhi_start_transfer to resume activity. + * @mhi_dev: Device associated with the channels + */ +int mhi_stop_transfer(struct mhi_device *mhi_dev); + +/** + * mhi_start_transfer - Resumes channel activity by issuing the START channel + * command to both UL and DL channels. This command assumes + * the channel context is already setup and the client + * drivers can issue mhi_stop_transfer to pause activity if + * required. + * @mhi_dev: Device associated with the channels + */ +int mhi_start_transfer(struct mhi_device *mhi_dev); + +/** * mhi_poll - Poll for any available data in DL direction * @mhi_dev: Device associated with the channels * @budget: # of events to process From patchwork Wed Dec 2 23:40:36 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bhaumik Bhatt X-Patchwork-Id: 11947341 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,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 4996EC8300F for ; Wed, 2 Dec 2020 23:42:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1207822206 for ; Wed, 2 Dec 2020 23:42:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387566AbgLBXmM (ORCPT ); Wed, 2 Dec 2020 18:42:12 -0500 Received: from m42-5.mailgun.net ([69.72.42.5]:16951 "EHLO m42-5.mailgun.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387644AbgLBXmL (ORCPT ); Wed, 2 Dec 2020 18:42:11 -0500 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1606952514; h=References: In-Reply-To: Message-Id: Date: Subject: Cc: To: From: Sender; bh=DZXaikanm41KFQVGUsB6LrRiWWff5TixI1kkjmw4uWc=; b=DxJJJe99bb+QMKMAMAjsA6C9pRZ3ldE4SYKHxgCpsCWVcmfXxyZYHXfvcTjTLHsjQPxgE8Sh i39IXlrgNZOxpfszlQh60kvXabhjOleyDywub6CPt64DiFthTsrQ3d79YziwwQzBcoccnlkX qPaGVphzFjqE1qRYbqQ2D+o+eTM= X-Mailgun-Sending-Ip: 69.72.42.5 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-n03.prod.us-west-2.postgun.com with SMTP id 5fc826048d03b22a5a679b98 (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Wed, 02 Dec 2020 23:40:52 GMT Sender: bbhatt=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 2AAACC43464; Wed, 2 Dec 2020 23:40:52 +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 53A66C433ED; Wed, 2 Dec 2020 23:40:51 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 53A66C433ED 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, hemantk@codeaurora.org Cc: linux-arm-msm@vger.kernel.org, loic.poulain@linaro.org, jhugo@codeaurora.org, linux-kernel@vger.kernel.org, Bhaumik Bhatt Subject: [PATCH v3 5/7] bus: mhi: core: Check execution environment for channel before issuing reset Date: Wed, 2 Dec 2020 15:40:36 -0800 Message-Id: <1606952438-15321-6-git-send-email-bbhatt@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1606952438-15321-1-git-send-email-bbhatt@codeaurora.org> References: <1606952438-15321-1-git-send-email-bbhatt@codeaurora.org> Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org A client can attempt to unprepare certain channels for transfer even after the execution environment they are supposed to run in has changed. In the event that happens, the device need not be notified of the reset and the host can proceed with clean up for the channel context and memory allocated for it on the host. Signed-off-by: Bhaumik Bhatt Reviewed-by: Hemant Kumar --- drivers/bus/mhi/core/main.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c index 2e4b34a..40d15ef 100644 --- a/drivers/bus/mhi/core/main.c +++ b/drivers/bus/mhi/core/main.c @@ -1320,11 +1320,24 @@ static void __mhi_unprepare_channel(struct mhi_controller *mhi_cntrl, /* no more processing events for this channel */ mutex_lock(&mhi_chan->mutex); + if (!(BIT(mhi_cntrl->ee) & mhi_chan->ee_mask)) { + dev_err(dev, + "Current EE: %s Required EE Mask: 0x%x for chan: %s\n", + TO_MHI_EXEC_STR(mhi_cntrl->ee), mhi_chan->ee_mask, + mhi_chan->name); + goto exit_unprepare_channel; + } + ret = mhi_update_channel_state(mhi_cntrl, mhi_chan, MHI_CH_STATE_TYPE_RESET); if (ret) dev_err(dev, "Failed to reset channel, still resetting\n"); +exit_unprepare_channel: + write_lock_irq(&mhi_chan->lock); + mhi_chan->ch_state = MHI_CH_STATE_DISABLED; + write_unlock_irq(&mhi_chan->lock); + if (!mhi_chan->offload_ch) { mhi_reset_chan(mhi_cntrl, mhi_chan); mhi_deinit_chan_ctxt(mhi_cntrl, mhi_chan); From patchwork Wed Dec 2 23:40:37 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bhaumik Bhatt X-Patchwork-Id: 11947331 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,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 C8397C8300F for ; Wed, 2 Dec 2020 23:41:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8CCD6221EB for ; Wed, 2 Dec 2020 23:41:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728862AbgLBXlq (ORCPT ); Wed, 2 Dec 2020 18:41:46 -0500 Received: from m42-5.mailgun.net ([69.72.42.5]:37025 "EHLO m42-5.mailgun.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728745AbgLBXlo (ORCPT ); Wed, 2 Dec 2020 18:41:44 -0500 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1606952479; h=References: In-Reply-To: Message-Id: Date: Subject: Cc: To: From: Sender; bh=MyL4yGoUux7OD/Qa2VquWaUqKLRV4yAEWaAEF7F3WXg=; b=oLCxEZj1mhKLF20cOv+E1B3PbiyMM7aNGLRNKTiRZ+9VvUWO8NMQwdToIwAMfd2wNWq3/rr2 xBNJzmBcKsclev95SGfLyaGAi+G+ecvpekK70zwAXVebXBpYX8ix4NGU6zrVwAUrJRIyT+Re 6Efjib5qec6FKSm0/fjPRXBIiQY= X-Mailgun-Sending-Ip: 69.72.42.5 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-n07.prod.us-east-1.postgun.com with SMTP id 5fc826057e5eb22240f680a3 (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Wed, 02 Dec 2020 23:40:53 GMT Sender: bbhatt=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id A094DC433ED; Wed, 2 Dec 2020 23:40:52 +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 DA333C43461; Wed, 2 Dec 2020 23:40:51 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org DA333C43461 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, hemantk@codeaurora.org Cc: linux-arm-msm@vger.kernel.org, loic.poulain@linaro.org, jhugo@codeaurora.org, linux-kernel@vger.kernel.org, Bhaumik Bhatt Subject: [PATCH v3 6/7] bus: mhi: core: Remove __ prefix for MHI channel unprepare function Date: Wed, 2 Dec 2020 15:40:37 -0800 Message-Id: <1606952438-15321-7-git-send-email-bbhatt@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1606952438-15321-1-git-send-email-bbhatt@codeaurora.org> References: <1606952438-15321-1-git-send-email-bbhatt@codeaurora.org> Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org The __mhi_unprepare_channel() API does not require the __ prefix. Get rid of it and make the internal function consistent with the other function names. Signed-off-by: Bhaumik Bhatt Reviewed-by: Manivannan Sadhasivam Reviewed-by: Hemant Kumar --- drivers/bus/mhi/core/main.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c index 40d15ef..566507d 100644 --- a/drivers/bus/mhi/core/main.c +++ b/drivers/bus/mhi/core/main.c @@ -1311,8 +1311,8 @@ static int mhi_update_channel_state(struct mhi_controller *mhi_cntrl, return -EINVAL; } -static void __mhi_unprepare_channel(struct mhi_controller *mhi_cntrl, - struct mhi_chan *mhi_chan) +static void mhi_unprepare_channel(struct mhi_controller *mhi_cntrl, + struct mhi_chan *mhi_chan) { int ret; struct device *dev = &mhi_cntrl->mhi_dev->dev; @@ -1425,7 +1425,7 @@ int mhi_prepare_channel(struct mhi_controller *mhi_cntrl, error_pre_alloc: mutex_unlock(&mhi_chan->mutex); - __mhi_unprepare_channel(mhi_cntrl, mhi_chan); + mhi_unprepare_channel(mhi_cntrl, mhi_chan); return ret; } @@ -1542,7 +1542,7 @@ int mhi_prepare_for_transfer(struct mhi_device *mhi_dev) if (!mhi_chan) continue; - __mhi_unprepare_channel(mhi_cntrl, mhi_chan); + mhi_unprepare_channel(mhi_cntrl, mhi_chan); } return ret; @@ -1560,7 +1560,7 @@ void mhi_unprepare_from_transfer(struct mhi_device *mhi_dev) if (!mhi_chan) continue; - __mhi_unprepare_channel(mhi_cntrl, mhi_chan); + mhi_unprepare_channel(mhi_cntrl, mhi_chan); } } EXPORT_SYMBOL_GPL(mhi_unprepare_from_transfer); From patchwork Wed Dec 2 23:40:38 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bhaumik Bhatt X-Patchwork-Id: 11947335 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,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=unavailable 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 4E519C83016 for ; Wed, 2 Dec 2020 23:41:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1D10121D93 for ; Wed, 2 Dec 2020 23:41:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728891AbgLBXlq (ORCPT ); Wed, 2 Dec 2020 18:41:46 -0500 Received: from m42-5.mailgun.net ([69.72.42.5]:19404 "EHLO m42-5.mailgun.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728121AbgLBXlq (ORCPT ); Wed, 2 Dec 2020 18:41:46 -0500 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1606952481; h=References: In-Reply-To: Message-Id: Date: Subject: Cc: To: From: Sender; bh=0WKk5xDjofv388J2WnbQdKBLVyRfY397LKch54vy5Yk=; b=jquvAgT0ppTn6qx3USsGfpviqDmMhep70st66A+Rp3Bt7MqLcAAktjr8TKTn2NoxJ/UOXebF DMUAtgrPCbHnHdfWBNpGWimMio1cwxRGAbl9onJEfWtjBdLia+SNBr2D1eULRQekAb1G8qzX xZXhloyBDcFrYWSq1UGXCrLfTag= X-Mailgun-Sending-Ip: 69.72.42.5 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-n08.prod.us-east-1.postgun.com with SMTP id 5fc82605875646f1e98536d8 (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Wed, 02 Dec 2020 23:40:53 GMT Sender: bbhatt=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 38451C43463; Wed, 2 Dec 2020 23:40:53 +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 76050C433C6; Wed, 2 Dec 2020 23:40:52 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 76050C433C6 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, hemantk@codeaurora.org Cc: linux-arm-msm@vger.kernel.org, loic.poulain@linaro.org, jhugo@codeaurora.org, linux-kernel@vger.kernel.org, Bhaumik Bhatt Subject: [PATCH v3 7/7] bus: mhi: Improve documentation on channel transfer setup APIs Date: Wed, 2 Dec 2020 15:40:38 -0800 Message-Id: <1606952438-15321-8-git-send-email-bbhatt@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1606952438-15321-1-git-send-email-bbhatt@codeaurora.org> References: <1606952438-15321-1-git-send-email-bbhatt@codeaurora.org> Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org The mhi_prepare_for_transfer() and mhi_unprepare_from_transfer() APIs could use better explanation, especially with the addition of two new APIs to start and stop the transfers on channels. Add better set of information for those APIs. Signed-off-by: Bhaumik Bhatt Reviewed-by: Hemant Kumar --- include/linux/mhi.h | 26 ++++++++++++++++++++++++-- 1 file changed, 24 insertions(+), 2 deletions(-) diff --git a/include/linux/mhi.h b/include/linux/mhi.h index 35779a0..bd229da 100644 --- a/include/linux/mhi.h +++ b/include/linux/mhi.h @@ -692,13 +692,35 @@ int mhi_device_get_sync(struct mhi_device *mhi_dev); void mhi_device_put(struct mhi_device *mhi_dev); /** - * mhi_prepare_for_transfer - Setup channel for data transfer + * mhi_prepare_for_transfer - Setup UL and DL channels for data transfer. + * Allocate and initialize the channel context and + * also issue the START channel command to both + * channels. Channels can be started only if both + * host and device execution environments match and + * channels are in a DISABLED state. Calling the + * mhi_start_transfer() function is not required + * afterwards as channels are already started. This + * function also initializes the channel context + * whereas mhi_start_transfer() can only be used to + * issue the start channel command once the context + * is setup. * @mhi_dev: Device associated with the channels */ int mhi_prepare_for_transfer(struct mhi_device *mhi_dev); /** - * mhi_unprepare_from_transfer - Unprepare the channels + * mhi_unprepare_from_transfer - Reset UL and DL channels for data transfer. + * Issue the RESET channel command and let the + * device clean-up the context so no incoming + * transfers are seen on the host. Free memory + * associated with the context on host. If device + * is unresponsive, only perform a host side + * clean-up. Channels can be reset only if both + * host and device execution environments match + * and channels are in an ENABLED, STOPPED or + * SUSPENDED state. Calling mhi_stop_transfer() is + * not required before calling this function as it + * will only stop transfers, not reset channels. * @mhi_dev: Device associated with the channels */ void mhi_unprepare_from_transfer(struct mhi_device *mhi_dev);