From patchwork Fri Aug 14 09:55:39 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: 11714109 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 679BE138C for ; Fri, 14 Aug 2020 09:57:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 59E62207DA for ; Fri, 14 Aug 2020 09:57:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726889AbgHNJ4y (ORCPT ); Fri, 14 Aug 2020 05:56:54 -0400 Received: from alexa-out.qualcomm.com ([129.46.98.28]:5634 "EHLO alexa-out.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726603AbgHNJ4y (ORCPT ); Fri, 14 Aug 2020 05:56:54 -0400 Received: from ironmsg-lv-alpha.qualcomm.com ([10.47.202.13]) by alexa-out.qualcomm.com with ESMTP; 14 Aug 2020 02:56:53 -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 02:56:50 -0700 Received: from c-rojay-linux.qualcomm.com ([10.206.21.80]) by ironmsg02-blr.qualcomm.com with ESMTP; 14 Aug 2020 15:26:30 +0530 Received: by c-rojay-linux.qualcomm.com (Postfix, from userid 88981) id 925F11AC8; Fri, 14 Aug 2020 15:26:29 +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 1/2] i2c: i2c-qcom-geni: Add tx_dma, rx_dma and xfer_len to geni_i2c_dev struct Date: Fri, 14 Aug 2020 15:25:39 +0530 Message-Id: <20200814095540.32115-2-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-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Adding tx_dma, rx_dma and xfer length in geni_i2c_dev struct to store DMA mapping data to enhance its scope. For example during shutdown callback to unmap DMA mapping, these new struct members can be used as part of geni_se_tx_dma_unprep and geni_se_rx_dma_unprep calls. Signed-off-by: Roja Rani Yarubandi --- drivers/i2c/busses/i2c-qcom-geni.c | 23 +++++++++++++---------- 1 file changed, 13 insertions(+), 10 deletions(-) diff --git a/drivers/i2c/busses/i2c-qcom-geni.c b/drivers/i2c/busses/i2c-qcom-geni.c index 7f130829bf01..53ca41f76080 100644 --- a/drivers/i2c/busses/i2c-qcom-geni.c +++ b/drivers/i2c/busses/i2c-qcom-geni.c @@ -86,6 +86,9 @@ struct geni_i2c_dev { u32 clk_freq_out; const struct geni_i2c_clk_fld *clk_fld; int suspended; + dma_addr_t tx_dma; + dma_addr_t rx_dma; + u32 xfer_len; }; struct geni_i2c_err_log { @@ -352,12 +355,11 @@ static void geni_i2c_tx_fsm_rst(struct geni_i2c_dev *gi2c) static int geni_i2c_rx_one_msg(struct geni_i2c_dev *gi2c, struct i2c_msg *msg, u32 m_param) { - dma_addr_t rx_dma; unsigned long time_left; void *dma_buf = NULL; struct geni_se *se = &gi2c->se; - size_t len = msg->len; + gi2c->xfer_len = msg->len; if (!of_machine_is_compatible("lenovo,yoga-c630")) dma_buf = i2c_get_dma_safe_msg_buf(msg, 32); @@ -366,9 +368,10 @@ static int geni_i2c_rx_one_msg(struct geni_i2c_dev *gi2c, struct i2c_msg *msg, else geni_se_select_mode(se, GENI_SE_FIFO); - writel_relaxed(len, se->base + SE_I2C_RX_TRANS_LEN); + writel_relaxed(gi2c->xfer_len, se->base + SE_I2C_RX_TRANS_LEN); - if (dma_buf && geni_se_rx_dma_prep(se, dma_buf, len, &rx_dma)) { + if (dma_buf && geni_se_rx_dma_prep(se, dma_buf, gi2c->xfer_len, + &gi2c->rx_dma)) { geni_se_select_mode(se, GENI_SE_FIFO); i2c_put_dma_safe_msg_buf(dma_buf, msg, false); dma_buf = NULL; @@ -384,7 +387,7 @@ static int geni_i2c_rx_one_msg(struct geni_i2c_dev *gi2c, struct i2c_msg *msg, if (dma_buf) { if (gi2c->err) geni_i2c_rx_fsm_rst(gi2c); - geni_se_rx_dma_unprep(se, rx_dma, len); + geni_se_rx_dma_unprep(se, gi2c->rx_dma, gi2c->xfer_len); i2c_put_dma_safe_msg_buf(dma_buf, msg, !gi2c->err); } @@ -394,12 +397,11 @@ static int geni_i2c_rx_one_msg(struct geni_i2c_dev *gi2c, struct i2c_msg *msg, static int geni_i2c_tx_one_msg(struct geni_i2c_dev *gi2c, struct i2c_msg *msg, u32 m_param) { - dma_addr_t tx_dma; unsigned long time_left; void *dma_buf = NULL; struct geni_se *se = &gi2c->se; - size_t len = msg->len; + gi2c->xfer_len = msg->len; if (!of_machine_is_compatible("lenovo,yoga-c630")) dma_buf = i2c_get_dma_safe_msg_buf(msg, 32); @@ -408,9 +410,10 @@ static int geni_i2c_tx_one_msg(struct geni_i2c_dev *gi2c, struct i2c_msg *msg, else geni_se_select_mode(se, GENI_SE_FIFO); - writel_relaxed(len, se->base + SE_I2C_TX_TRANS_LEN); + writel_relaxed(gi2c->xfer_len, se->base + SE_I2C_TX_TRANS_LEN); - if (dma_buf && geni_se_tx_dma_prep(se, dma_buf, len, &tx_dma)) { + if (dma_buf && geni_se_tx_dma_prep(se, dma_buf, gi2c->xfer_len, + &gi2c->tx_dma)) { geni_se_select_mode(se, GENI_SE_FIFO); i2c_put_dma_safe_msg_buf(dma_buf, msg, false); dma_buf = NULL; @@ -429,7 +432,7 @@ static int geni_i2c_tx_one_msg(struct geni_i2c_dev *gi2c, struct i2c_msg *msg, if (dma_buf) { if (gi2c->err) geni_i2c_tx_fsm_rst(gi2c); - geni_se_tx_dma_unprep(se, tx_dma, len); + geni_se_tx_dma_unprep(se, gi2c->tx_dma, gi2c->xfer_len); i2c_put_dma_safe_msg_buf(dma_buf, msg, !gi2c->err); } 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: 11714105 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 5926D739 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 44541204EA for ; Fri, 14 Aug 2020 09:57:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727104AbgHNJ44 (ORCPT ); Fri, 14 Aug 2020 05:56:56 -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-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@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