From patchwork Mon Apr 27 15:59:08 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeffrey Hugo X-Patchwork-Id: 189428 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=-9.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, 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 483E3C54FCB for ; Mon, 27 Apr 2020 15:59:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 107C6206BF for ; Mon, 27 Apr 2020 15:59:33 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=mg.codeaurora.org header.i=@mg.codeaurora.org header.b="xkj5VKss" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727936AbgD0P7c (ORCPT ); Mon, 27 Apr 2020 11:59:32 -0400 Received: from mail27.static.mailgun.info ([104.130.122.27]:37853 "EHLO mail27.static.mailgun.info" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727817AbgD0P7c (ORCPT ); Mon, 27 Apr 2020 11:59:32 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1588003171; h=References: In-Reply-To: Message-Id: Date: Subject: Cc: To: From: Sender; bh=CXYmgRCO81Hh7DKx4YAGDyQPNSLKrhyVfEISQa9j/wg=; b=xkj5VKssY47NtR3KULA6nd6ufIO7Txb3LLTnkdF/b+bJD4soz0yDjLOnqYIoCfGcrqKZuDJR ZowoQsZ9hbO6ZSpFuRpc7tZ+zVsL61aV6Cf6dcdJm/s/jdBjmNrp1gG0HaKd18IbPpId9R7T dPatYEQNKn+X0f+7HlUElHSQ/rI= X-Mailgun-Sending-Ip: 104.130.122.27 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 mxa.mailgun.org with ESMTP id 5ea70163.7f7371eb0110-smtp-out-n03; Mon, 27 Apr 2020 15:59:31 -0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 3D0EEC433F2; Mon, 27 Apr 2020 15:59:30 +0000 (UTC) Received: from jhugo-perf-lnx.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: jhugo) by smtp.codeaurora.org (Postfix) with ESMTPSA id 56AD8C433CB; Mon, 27 Apr 2020 15:59:29 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 56AD8C433CB 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=none smtp.mailfrom=jhugo@codeaurora.org From: Jeffrey Hugo To: manivannan.sadhasivam@linaro.org, hemantk@codeaurora.org Cc: bbhatt@codeaurora.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, Jeffrey Hugo Subject: [PATCH v3 1/6] bus: mhi: core: Make sure to powerdown if mhi_sync_power_up fails Date: Mon, 27 Apr 2020 09:59:08 -0600 Message-Id: <1588003153-13139-2-git-send-email-jhugo@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1588003153-13139-1-git-send-email-jhugo@codeaurora.org> References: <1588003153-13139-1-git-send-email-jhugo@codeaurora.org> Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Powerdown is necessary if mhi_sync_power_up fails due to a timeout, to clean up the resources. Otherwise a BUG could be triggered when attempting to clean up MSIs because the IRQ is still active from a request_irq(). Signed-off-by: Jeffrey Hugo Reviewed-by: Manivannan Sadhasivam --- drivers/bus/mhi/core/pm.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c index 52690cb..dc83d65 100644 --- a/drivers/bus/mhi/core/pm.c +++ b/drivers/bus/mhi/core/pm.c @@ -902,7 +902,11 @@ int mhi_sync_power_up(struct mhi_controller *mhi_cntrl) MHI_PM_IN_ERROR_STATE(mhi_cntrl->pm_state), msecs_to_jiffies(mhi_cntrl->timeout_ms)); - return (MHI_IN_MISSION_MODE(mhi_cntrl->ee)) ? 0 : -EIO; + ret = (MHI_IN_MISSION_MODE(mhi_cntrl->ee)) ? 0 : -ETIMEDOUT; + if (ret) + mhi_power_down(mhi_cntrl, false); + + return ret; } EXPORT_SYMBOL(mhi_sync_power_up); From patchwork Mon Apr 27 15:59:10 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeffrey Hugo X-Patchwork-Id: 189427 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=-9.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, 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 0FE86C55199 for ; Mon, 27 Apr 2020 15:59:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DDFB02075B for ; Mon, 27 Apr 2020 15:59:53 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=mg.codeaurora.org header.i=@mg.codeaurora.org header.b="WFlO0IVS" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728455AbgD0P7t (ORCPT ); Mon, 27 Apr 2020 11:59:49 -0400 Received: from mail27.static.mailgun.info ([104.130.122.27]:22640 "EHLO mail27.static.mailgun.info" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728200AbgD0P7s (ORCPT ); Mon, 27 Apr 2020 11:59:48 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1588003186; h=References: In-Reply-To: Message-Id: Date: Subject: Cc: To: From: Sender; bh=f/y8ZmWjuFPw09AupAp8NTMvIoR6jRpIZRqaRrwFPNU=; b=WFlO0IVSN0O59fOQSn0ThoDA8UVRXgy/8ocagrwUfst0UbPdV5wonTrCNL1GWjFDZTm7LfIY 1VyhRUUtY94giI/af7SwDGvaBrOqYU6v6iRWZ9hERVEy/ldxmwlzLOWckCqVEShFpd304VrK LEn41UgvXbqWmhRs11A9zUp4ZlM= X-Mailgun-Sending-Ip: 104.130.122.27 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 mxa.mailgun.org with ESMTP id 5ea70167.7f721d3453e8-smtp-out-n03; Mon, 27 Apr 2020 15:59:35 -0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 35566C43636; Mon, 27 Apr 2020 15:59:34 +0000 (UTC) Received: from jhugo-perf-lnx.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: jhugo) by smtp.codeaurora.org (Postfix) with ESMTPSA id EC024C433CB; Mon, 27 Apr 2020 15:59:32 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org EC024C433CB 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=none smtp.mailfrom=jhugo@codeaurora.org From: Jeffrey Hugo To: manivannan.sadhasivam@linaro.org, hemantk@codeaurora.org Cc: bbhatt@codeaurora.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, Jeffrey Hugo Subject: [PATCH v3 3/6] bus: mhi: core: Offload register accesses to the controller Date: Mon, 27 Apr 2020 09:59:10 -0600 Message-Id: <1588003153-13139-4-git-send-email-jhugo@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1588003153-13139-1-git-send-email-jhugo@codeaurora.org> References: <1588003153-13139-1-git-send-email-jhugo@codeaurora.org> Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org When reading or writing MHI registers, the core assumes that the physical link is a memory mapped PCI link. This assumption may not hold for all MHI devices. The controller knows what is the physical link (ie PCI, I2C, SPI, etc), and therefore knows the proper methods to access that link. The controller can also handle link specific error scenarios, such as reading -1 when the PCI link went down. Therefore, it is appropriate that the MHI core requests the controller to make register accesses on behalf of the core, which abstracts the core from link specifics, and end up removing an unnecessary assumption. Signed-off-by: Jeffrey Hugo --- drivers/bus/mhi/core/init.c | 3 ++- drivers/bus/mhi/core/internal.h | 3 --- drivers/bus/mhi/core/main.c | 12 ++---------- include/linux/mhi.h | 6 ++++++ 4 files changed, 10 insertions(+), 14 deletions(-) diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c index 2af08d57..eb2ab05 100644 --- a/drivers/bus/mhi/core/init.c +++ b/drivers/bus/mhi/core/init.c @@ -813,7 +813,8 @@ int mhi_register_controller(struct mhi_controller *mhi_cntrl, return -EINVAL; if (!mhi_cntrl->runtime_get || !mhi_cntrl->runtime_put || - !mhi_cntrl->status_cb) + !mhi_cntrl->status_cb || !mhi_cntrl->read_reg || + !mhi_cntrl->write_reg) return -EINVAL; ret = parse_config(mhi_cntrl, config); diff --git a/drivers/bus/mhi/core/internal.h b/drivers/bus/mhi/core/internal.h index 5deadfa..095d95b 100644 --- a/drivers/bus/mhi/core/internal.h +++ b/drivers/bus/mhi/core/internal.h @@ -11,9 +11,6 @@ extern struct bus_type mhi_bus_type; -/* MHI MMIO register mapping */ -#define PCI_INVALID_READ(val) (val == U32_MAX) - #define MHIREGLEN (0x0) #define MHIREGLEN_MHIREGLEN_MASK (0xFFFFFFFF) #define MHIREGLEN_MHIREGLEN_SHIFT (0) diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c index 473278b8..580d72b 100644 --- a/drivers/bus/mhi/core/main.c +++ b/drivers/bus/mhi/core/main.c @@ -18,15 +18,7 @@ int __must_check mhi_read_reg(struct mhi_controller *mhi_cntrl, void __iomem *base, u32 offset, u32 *out) { - u32 tmp = readl(base + offset); - - /* If the value is invalid, the link is down */ - if (PCI_INVALID_READ(tmp)) - return -EIO; - - *out = tmp; - - return 0; + return mhi_cntrl->read_reg(mhi_cntrl, base + offset, out); } int __must_check mhi_read_reg_field(struct mhi_controller *mhi_cntrl, @@ -48,7 +40,7 @@ int __must_check mhi_read_reg_field(struct mhi_controller *mhi_cntrl, void mhi_write_reg(struct mhi_controller *mhi_cntrl, void __iomem *base, u32 offset, u32 val) { - writel(val, base + offset); + mhi_cntrl->write_reg(mhi_cntrl, base + offset, val); } void mhi_write_reg_field(struct mhi_controller *mhi_cntrl, void __iomem *base, diff --git a/include/linux/mhi.h b/include/linux/mhi.h index be704a4..225a03a 100644 --- a/include/linux/mhi.h +++ b/include/linux/mhi.h @@ -342,6 +342,8 @@ struct mhi_controller_config { * @runtimet_put: CB function to decrement pm usage (required) * @map_single: CB function to create TRE buffer * @unmap_single: CB function to destroy TRE buffer + * @read_reg: Read a MHI register via the physical link (required) + * @write_reg: Write a MHI register via the physical link (required) * @buffer_len: Bounce buffer length * @bounce_buf: Use of bounce buffer * @fbc_download: MHI host needs to do complete image transfer (optional) @@ -425,6 +427,10 @@ struct mhi_controller { struct mhi_buf_info *buf); void (*unmap_single)(struct mhi_controller *mhi_cntrl, struct mhi_buf_info *buf); + int (*read_reg)(struct mhi_controller *mhi_cntrl, void __iomem *addr, + u32 *out); + void (*write_reg)(struct mhi_controller *mhi_cntrl, void __iomem *addr, + u32 val); size_t buffer_len; bool bounce_buf; From patchwork Mon Apr 27 15:59:12 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeffrey Hugo X-Patchwork-Id: 189425 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=-9.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, 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 7A572C54FD0 for ; Mon, 27 Apr 2020 16:00:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 446D7205C9 for ; Mon, 27 Apr 2020 16:00:01 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=mg.codeaurora.org header.i=@mg.codeaurora.org header.b="fL3L2jyo" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728292AbgD0P7o (ORCPT ); Mon, 27 Apr 2020 11:59:44 -0400 Received: from mail26.static.mailgun.info ([104.130.122.26]:39760 "EHLO mail26.static.mailgun.info" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727073AbgD0P7n (ORCPT ); Mon, 27 Apr 2020 11:59:43 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1588003183; h=References: In-Reply-To: Message-Id: Date: Subject: Cc: To: From: Sender; bh=/9q73TN0qA+ILuWfO7wpBj99H8TUww0pz6HfMXIUEPg=; b=fL3L2jyoQ8Buzbm8aYXFI/ebh3fIRQQX6FrZuMXyfoXYbfcwfrD08+2bdvhSialjUY6tM6q4 HfkuDNylLT28ws4UsZ5bifzfwlnGJSl2wBGknczmw6LcYGXT+Rx3RGnhaEUUm5xhBorZmrMF 02y0r0r1UyjTt6RU06y3LgQzLdk= X-Mailgun-Sending-Ip: 104.130.122.26 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 mxa.mailgun.org with ESMTP id 5ea7016a.7fb6b94110a0-smtp-out-n01; Mon, 27 Apr 2020 15:59:38 -0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 9E7F6C433BA; Mon, 27 Apr 2020 15:59:37 +0000 (UTC) Received: from jhugo-perf-lnx.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: jhugo) by smtp.codeaurora.org (Postfix) with ESMTPSA id B7438C432C2; Mon, 27 Apr 2020 15:59:36 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org B7438C432C2 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=none smtp.mailfrom=jhugo@codeaurora.org From: Jeffrey Hugo To: manivannan.sadhasivam@linaro.org, hemantk@codeaurora.org Cc: bbhatt@codeaurora.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, Jeffrey Hugo Subject: [PATCH v3 5/6] bus: mhi: core: Handle syserr during power_up Date: Mon, 27 Apr 2020 09:59:12 -0600 Message-Id: <1588003153-13139-6-git-send-email-jhugo@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1588003153-13139-1-git-send-email-jhugo@codeaurora.org> References: <1588003153-13139-1-git-send-email-jhugo@codeaurora.org> Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org The MHI device may be in the syserr state when we attempt to init it in power_up(). Since we have no local state, the handling is simple - reset the device and wait for it to transition out of the reset state. Signed-off-by: Jeffrey Hugo --- drivers/bus/mhi/core/pm.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c index dc83d65..239619b 100644 --- a/drivers/bus/mhi/core/pm.c +++ b/drivers/bus/mhi/core/pm.c @@ -9,6 +9,7 @@ #include #include #include +#include #include #include #include @@ -760,6 +761,7 @@ static void mhi_deassert_dev_wake(struct mhi_controller *mhi_cntrl, int mhi_async_power_up(struct mhi_controller *mhi_cntrl) { + enum mhi_state state; enum mhi_ee_type current_ee; enum dev_st_transition next_state; struct device *dev = &mhi_cntrl->mhi_dev->dev; @@ -829,6 +831,24 @@ int mhi_async_power_up(struct mhi_controller *mhi_cntrl) goto error_bhi_offset; } + state = mhi_get_mhi_state(mhi_cntrl); + if (state == MHI_STATE_SYS_ERR) { + mhi_set_mhi_state(mhi_cntrl, MHI_STATE_RESET); + ret = readl_poll_timeout(mhi_cntrl->regs + MHICTRL, val, + !(val & MHICTRL_RESET_MASK), 1000, + mhi_cntrl->timeout_ms * 1000); + if (ret) { + dev_info(dev, "Failed to reset MHI due to syserr state\n"); + goto error_bhi_offset; + } + + /* + * device cleares INTVEC as part of RESET processing, + * re-program it + */ + mhi_write_reg(mhi_cntrl, mhi_cntrl->bhi, BHI_INTVEC, 0); + } + /* Transition to next state */ next_state = MHI_IN_PBL(current_ee) ? DEV_ST_TRANSITION_PBL : DEV_ST_TRANSITION_READY; From patchwork Mon Apr 27 15:59:13 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeffrey Hugo X-Patchwork-Id: 189426 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=-9.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, 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 A10E7C55199 for ; Mon, 27 Apr 2020 15:59:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 798C3205C9 for ; Mon, 27 Apr 2020 15:59:59 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=mg.codeaurora.org header.i=@mg.codeaurora.org header.b="uwb+04Qy" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728198AbgD0P76 (ORCPT ); Mon, 27 Apr 2020 11:59:58 -0400 Received: from mail26.static.mailgun.info ([104.130.122.26]:23794 "EHLO mail26.static.mailgun.info" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728273AbgD0P7p (ORCPT ); Mon, 27 Apr 2020 11:59:45 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1588003185; h=References: In-Reply-To: Message-Id: Date: Subject: Cc: To: From: Sender; bh=Lp4UVvPmMQjC2/JYxwrZKcQ0qPfOGZ4e+RUvnDeF/TE=; b=uwb+04QyzhrPAPEgofPEQORMya5JNkkzS+oMJf04jaQbtGdOq8hyP2TA1eIrAEnaOF6jwOyQ enn0IRWaM0IjRgt0ycoa21fgJOaOXi406WoOl+4BUiM/AZgsUCiPYOP6ggiQPVGu+SIu+W3C thZxiYI76H6Q+d8aDi1R3bPB0iI= X-Mailgun-Sending-Ip: 104.130.122.26 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 mxa.mailgun.org with ESMTP id 5ea7016d.7f1064cf9110-smtp-out-n02; Mon, 27 Apr 2020 15:59:41 -0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 1B29BC433CB; Mon, 27 Apr 2020 15:59:40 +0000 (UTC) Received: from jhugo-perf-lnx.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: jhugo) by smtp.codeaurora.org (Postfix) with ESMTPSA id AA644C432C2; Mon, 27 Apr 2020 15:59:38 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org AA644C432C2 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=none smtp.mailfrom=jhugo@codeaurora.org From: Jeffrey Hugo To: manivannan.sadhasivam@linaro.org, hemantk@codeaurora.org Cc: bbhatt@codeaurora.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, Jeffrey Hugo Subject: [PATCH v3 6/6] bus: mhi: core: Fix channel device name conflict Date: Mon, 27 Apr 2020 09:59:13 -0600 Message-Id: <1588003153-13139-7-git-send-email-jhugo@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1588003153-13139-1-git-send-email-jhugo@codeaurora.org> References: <1588003153-13139-1-git-send-email-jhugo@codeaurora.org> Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org When multiple instances of the same MHI product are present in a system, we can see a splat from mhi_create_devices() - "sysfs: cannot create duplicate filename". This is because the device names assigned to the MHI channel devices are non-unique. They consist of the channel's name, and the channel's pipe id. For identical products, each instance is going to have the same set of channel (both in name and pipe id). To fix this, we prepend the device name of the parent device that the MHI channels belong to. Since different instances of the same product should have unique device names, this makes the MHI channel devices for each product also unique. Additionally, remove the pipe id from the MHI channel device name. This is an internal detail to the MHI product that provides little value, and imposes too much device specific internal details to userspace. It is expected that channel with a specific name (ie "SAHARA") has a specific client, and it does not matter what pipe id that channel is enumerated on. The pipe id is an internal detail between the MHI bus, and the hardware. The client is not expected to make decisions based on the pipe id, and to do so would require the client to have intimate knowledge of the hardware, which is inappropiate as it may violate the layering provided by the MHI bus. The limitation of doing this is that each product may only have one instance of a channel by a unique name. This limitation is appropriate given the usecases of MHI channels. Signed-off-by: Jeffrey Hugo Reviewed-by: Hemant Kumar --- drivers/bus/mhi/core/main.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c index 580d72b..0ac0643 100644 --- a/drivers/bus/mhi/core/main.c +++ b/drivers/bus/mhi/core/main.c @@ -327,7 +327,8 @@ void mhi_create_devices(struct mhi_controller *mhi_cntrl) /* Channel name is same for both UL and DL */ mhi_dev->chan_name = mhi_chan->name; - dev_set_name(&mhi_dev->dev, "%04x_%s", mhi_chan->chan, + dev_set_name(&mhi_dev->dev, "%s_%s", + dev_name(mhi_cntrl->cntrl_dev), mhi_dev->chan_name); /* Init wakeup source if available */