From patchwork Fri Aug 14 09:55:40 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Roja Rani Yarubandi X-Patchwork-Id: 254909 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=-13.0 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, 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 C8C5DC433DF for ; Fri, 14 Aug 2020 09:57:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B2228204EA for ; Fri, 14 Aug 2020 09:57:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727095AbgHNJ4z (ORCPT ); Fri, 14 Aug 2020 05:56:55 -0400 Received: from alexa-out.qualcomm.com ([129.46.98.28]:55261 "EHLO alexa-out.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726679AbgHNJ4z (ORCPT ); Fri, 14 Aug 2020 05:56:55 -0400 Received: from ironmsg-lv-alpha.qualcomm.com ([10.47.202.13]) by alexa-out.qualcomm.com with ESMTP; 14 Aug 2020 02:56:54 -0700 Received: from ironmsg02-blr.qualcomm.com ([10.86.208.131]) by ironmsg-lv-alpha.qualcomm.com with ESMTP/TLS/AES256-SHA; 14 Aug 2020 02:56:52 -0700 Received: from c-rojay-linux.qualcomm.com ([10.206.21.80]) by ironmsg02-blr.qualcomm.com with ESMTP; 14 Aug 2020 15:26:33 +0530 Received: by c-rojay-linux.qualcomm.com (Postfix, from userid 88981) id 477501AC8; Fri, 14 Aug 2020 15:26:32 +0530 (IST) From: Roja Rani Yarubandi To: wsa@kernel.org Cc: swboyd@chromium.org, dianders@chromium.org, saiprakash.ranjan@codeaurora.org, gregkh@linuxfoundation.org, mka@chromium.org, akashast@codeaurora.org, msavaliy@qti.qualcomm.com, skakit@codeaurora.org, rnayak@codeaurora.org, agross@kernel.org, bjorn.andersson@linaro.org, linux-arm-msm@vger.kernel.org, linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, sumit.semwal@linaro.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, Roja Rani Yarubandi Subject: [PATCH 2/2] i2c: i2c-qcom-geni: Add shutdown callback for i2c Date: Fri, 14 Aug 2020 15:25:40 +0530 Message-Id: <20200814095540.32115-3-rojay@codeaurora.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200814095540.32115-1-rojay@codeaurora.org> References: <20200814095540.32115-1-rojay@codeaurora.org> MIME-Version: 1.0 Sender: linux-i2c-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org If the hardware is still accessing memory after SMMU translation is disabled(as part of smmu shutdown callback), then the IOVAs(I/O virtual address) which it was using will go on the bus as the physical addresses which will result in unknown crashes like NoC/interconnect errors. So, adding shutdown callback to i2c driver to unmap DMA mappings during system "reboot" or "shutdown". Signed-off-by: Roja Rani Yarubandi --- drivers/i2c/busses/i2c-qcom-geni.c | 36 ++++++++++++++++++++++++++++++ include/linux/qcom-geni-se.h | 5 +++++ 2 files changed, 41 insertions(+) diff --git a/drivers/i2c/busses/i2c-qcom-geni.c b/drivers/i2c/busses/i2c-qcom-geni.c index 53ca41f76080..749c225f95c4 100644 --- a/drivers/i2c/busses/i2c-qcom-geni.c +++ b/drivers/i2c/busses/i2c-qcom-geni.c @@ -613,6 +613,41 @@ static int geni_i2c_remove(struct platform_device *pdev) return 0; } +static void geni_i2c_shutdown(struct platform_device *pdev) +{ + int ret; + struct geni_i2c_dev *gi2c = platform_get_drvdata(pdev); + struct geni_se *se = &gi2c->se; + u32 dma; + u32 dma_dbg_reg; + + ret = pm_runtime_get_sync(gi2c->se.dev); + if (ret < 0) { + dev_err(gi2c->se.dev, "Failed to resume device:%d\n", ret); + return; + } + + dma = readl_relaxed(se->base + SE_GENI_DMA_MODE_EN); + if (dma) { + dma_dbg_reg = readl_relaxed(gi2c->se.base + SE_DMA_DEBUG_REG0); + if (dma_dbg_reg & DMA_TX_ACTIVE) { + geni_i2c_abort_xfer(gi2c); + gi2c->cur_wr = 0; + if (gi2c->err) + geni_i2c_tx_fsm_rst(gi2c); + geni_se_tx_dma_unprep(se, gi2c->tx_dma, gi2c->xfer_len); + } + if (dma_dbg_reg & DMA_RX_ACTIVE) { + geni_i2c_abort_xfer(gi2c); + gi2c->cur_rd = 0; + if (gi2c->err) + geni_i2c_rx_fsm_rst(gi2c); + geni_se_rx_dma_unprep(se, gi2c->rx_dma, gi2c->xfer_len); + } + } + pm_runtime_put_sync_suspend(gi2c->se.dev); +} + static int __maybe_unused geni_i2c_runtime_suspend(struct device *dev) { int ret; @@ -673,6 +708,7 @@ MODULE_DEVICE_TABLE(of, geni_i2c_dt_match); static struct platform_driver geni_i2c_driver = { .probe = geni_i2c_probe, .remove = geni_i2c_remove, + .shutdown = geni_i2c_shutdown, .driver = { .name = "geni_i2c", .pm = &geni_i2c_pm_ops, diff --git a/include/linux/qcom-geni-se.h b/include/linux/qcom-geni-se.h index dd464943f717..acad69be747d 100644 --- a/include/linux/qcom-geni-se.h +++ b/include/linux/qcom-geni-se.h @@ -77,6 +77,7 @@ struct geni_se { #define SE_DMA_RX_FSM_RST 0xd58 #define SE_HW_PARAM_0 0xe24 #define SE_HW_PARAM_1 0xe28 +#define SE_DMA_DEBUG_REG0 0xe40 /* GENI_FORCE_DEFAULT_REG fields */ #define FORCE_DEFAULT BIT(0) @@ -207,6 +208,10 @@ struct geni_se { #define RX_GENI_CANCEL_IRQ BIT(11) #define RX_GENI_GP_IRQ_EXT GENMASK(13, 12) +/* DMA DEBUG Register fields */ +#define DMA_TX_ACTIVE BIT(0) +#define DMA_RX_ACTIVE BIT(1) + /* SE_HW_PARAM_0 fields */ #define TX_FIFO_WIDTH_MSK GENMASK(29, 24) #define TX_FIFO_WIDTH_SHFT 24