From patchwork Tue Dec 17 17:04:23 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jyothi Kumar Seerapu X-Patchwork-Id: 13912231 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 14A63E77184 for ; Tue, 17 Dec 2024 17:04:54 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 90BEC10E28D; Tue, 17 Dec 2024 17:04:53 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=quicinc.com header.i=@quicinc.com header.b="V3Er22nU"; dkim-atps=neutral Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) by gabe.freedesktop.org (Postfix) with ESMTPS id 7826410E28D for ; Tue, 17 Dec 2024 17:04:52 +0000 (UTC) Received: from pps.filterd (m0279863.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 4BHB2eSo003042; Tue, 17 Dec 2024 17:04:48 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h= cc:content-type:date:from:in-reply-to:message-id:mime-version :references:subject:to; s=qcppdkim1; bh=286FtCTWicDq+EXvrGEy/Og6 /VAHYV74wP8nTr06WUI=; b=V3Er22nU/gu8sMgucEXZUYjjZsfL8wV4GdwUwf9F X26an+YOGbVmGhHPTQUR7HpVxvg8BuDgn88QV5ePblaDLzVOZlM+gMg5Sk9RPF8e qOgh1K5dGFozIsaCMheHjcacO3v8NC2aj+KYUP8wId6Fxe0HgsT8zZ5WyYQK56ek RBzQ9i6+mj7OJJaOEQK3Mtnt7wd1ambyUDBQKD/29YPKdnrs1IL6rBaTueGSUgWZ iLCZuP8OYzhky/ZmafSow8eTfzOTkFMzsFDZwHjHTp6xTFulLLfro4PBLJth7I8j i1GwTrPMNCj3qhvCMgPJ+KVM7QooOEYHKuHD/qe7jIcs1Q== Received: from nasanppmta02.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 43k831105f-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 17 Dec 2024 17:04:47 +0000 (GMT) Received: from nasanex01b.na.qualcomm.com (nasanex01b.na.qualcomm.com [10.46.141.250]) by NASANPPMTA02.qualcomm.com (8.18.1.2/8.18.1.2) with ESMTPS id 4BHH4kfT009332 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 17 Dec 2024 17:04:46 GMT Received: from hu-jseerapu-hyd.qualcomm.com (10.80.80.8) by nasanex01b.na.qualcomm.com (10.46.141.250) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.9; Tue, 17 Dec 2024 09:04:42 -0800 From: Jyothi Kumar Seerapu To: Vinod Koul , Andi Shyti , "Sumit Semwal" , =?utf-8?q?Christian_K=C3=B6nig?= CC: , , , , , , , , Subject: [PATCH v4 1/2] dmaengine: qcom: gpi: Add GPI Block event interrupt support Date: Tue, 17 Dec 2024 22:34:23 +0530 Message-ID: <20241217170424.14703-2-quic_jseerapu@quicinc.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20241217170424.14703-1-quic_jseerapu@quicinc.com> References: <20241217170424.14703-1-quic_jseerapu@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01b.na.qualcomm.com (10.46.141.250) To nasanex01b.na.qualcomm.com (10.46.141.250) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: LQBYP1yAhRykVfKte8hTy5AsVoKkJmwE X-Proofpoint-ORIG-GUID: LQBYP1yAhRykVfKte8hTy5AsVoKkJmwE X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.60.29 definitions=2024-09-06_09,2024-09-06_01,2024-09-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 priorityscore=1501 lowpriorityscore=0 mlxscore=0 spamscore=0 bulkscore=0 clxscore=1015 adultscore=0 malwarescore=0 impostorscore=0 mlxlogscore=999 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2411120000 definitions=main-2412170131 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" GSI hardware generates an interrupt for each transfer completion. For multiple messages within a single transfer, this results in N interrupts for N messages, leading to significant software interrupt latency. To mitigate this latency, utilize Block Event Interrupt (BEI) mechanism. Enabling BEI instructs the GSI hardware to prevent interrupt generation and BEI is disabled when an interrupt is necessary. When using BEI, consider splitting a single multi-message transfer into chunks of 8 internally. Interrupts are not expected for the first 7 message completions, only the last message triggers an interrupt,indicating the completion of 8 messages. This BEI mechanism enhances overall transfer efficiency. Signed-off-by: Jyothi Kumar Seerapu --- v3 -> v4: - API's added for Block event interrupt with multi descriptor support for I2C is moved from qcom-gpi-dma.h file to I2C geni qcom driver file. - gpi_multi_xfer_timeout_handler function is moved from GPI driver to I2C driver. v2-> v3: - Renamed gpi_multi_desc_process to gpi_multi_xfer_timeout_handler - MIN_NUM_OF_MSGS_MULTI_DESC changed from 4 to 2 - Added documentation for newly added changes in "qcom-gpi-dma.h" file - Updated commit description. v1 -> v2: - Changed dma_addr type from array of pointers to array. - To support BEI functionality with the TRE size of 64 defined in GPI driver, updated QCOM_GPI_MAX_NUM_MSGS to 16 and NUM_MSGS_PER_IRQ to 4. drivers/dma/qcom/gpi.c | 3 +++ include/linux/dma/qcom-gpi-dma.h | 9 +++++++++ 2 files changed, 12 insertions(+) diff --git a/drivers/dma/qcom/gpi.c b/drivers/dma/qcom/gpi.c index 52a7c8f2498f..74eabcd1416d 100644 --- a/drivers/dma/qcom/gpi.c +++ b/drivers/dma/qcom/gpi.c @@ -1693,6 +1693,9 @@ static int gpi_create_i2c_tre(struct gchan *chan, struct gpi_desc *desc, tre->dword[3] = u32_encode_bits(TRE_TYPE_DMA, TRE_FLAGS_TYPE); tre->dword[3] |= u32_encode_bits(1, TRE_FLAGS_IEOT); + + if (i2c->flags & QCOM_GPI_BLOCK_EVENT_IRQ) + tre->dword[3] |= u32_encode_bits(1, TRE_FLAGS_BEI); } for (i = 0; i < tre_idx; i++) diff --git a/include/linux/dma/qcom-gpi-dma.h b/include/linux/dma/qcom-gpi-dma.h index 6680dd1a43c6..d818c6a955e2 100644 --- a/include/linux/dma/qcom-gpi-dma.h +++ b/include/linux/dma/qcom-gpi-dma.h @@ -15,6 +15,13 @@ enum spi_transfer_cmd { SPI_DUPLEX, }; +/** + * define QCOM_GPI_BLOCK_EVENT_IRQ - Block event interrupt support + * + * This is used to enable/disable the Block event interrupt mechanism. + */ +#define QCOM_GPI_BLOCK_EVENT_IRQ BIT(0) + /** * struct gpi_spi_config - spi config for peripheral * @@ -65,6 +72,7 @@ enum i2c_op { * @rx_len: receive length for buffer * @op: i2c cmd * @muli-msg: is part of multi i2c r-w msgs + * @flags: true for block event interrupt support */ struct gpi_i2c_config { u8 set_config; @@ -78,6 +86,7 @@ struct gpi_i2c_config { u32 rx_len; enum i2c_op op; bool multi_msg; + bool flags; }; #endif /* QCOM_GPI_DMA_H */ From patchwork Tue Dec 17 17:04:24 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jyothi Kumar Seerapu X-Patchwork-Id: 13912232 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 09B92E77184 for ; Tue, 17 Dec 2024 17:04:59 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 7AE1410E762; Tue, 17 Dec 2024 17:04:58 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=quicinc.com header.i=@quicinc.com header.b="ej3Tf4rb"; dkim-atps=neutral Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) by gabe.freedesktop.org (Postfix) with ESMTPS id 3300610E762 for ; 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Tue, 17 Dec 2024 17:04:51 +0000 (GMT) Received: from nasanex01b.na.qualcomm.com (nasanex01b.na.qualcomm.com [10.46.141.250]) by NASANPPMTA04.qualcomm.com (8.18.1.2/8.18.1.2) with ESMTPS id 4BHH4osk007712 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 17 Dec 2024 17:04:50 GMT Received: from hu-jseerapu-hyd.qualcomm.com (10.80.80.8) by nasanex01b.na.qualcomm.com (10.46.141.250) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.9; Tue, 17 Dec 2024 09:04:46 -0800 From: Jyothi Kumar Seerapu To: Vinod Koul , Andi Shyti , "Sumit Semwal" , =?utf-8?q?Christian_K=C3=B6nig?= CC: , , , , , , , , Subject: [PATCH v4 2/2] i2c: i2c-qcom-geni: Add Block event interrupt support Date: Tue, 17 Dec 2024 22:34:24 +0530 Message-ID: <20241217170424.14703-3-quic_jseerapu@quicinc.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20241217170424.14703-1-quic_jseerapu@quicinc.com> References: <20241217170424.14703-1-quic_jseerapu@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01b.na.qualcomm.com (10.46.141.250) To nasanex01b.na.qualcomm.com (10.46.141.250) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: r03OK8Z8li-2hvqAqk-jft_PImNPDz8o X-Proofpoint-ORIG-GUID: r03OK8Z8li-2hvqAqk-jft_PImNPDz8o X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.60.29 definitions=2024-09-06_09,2024-09-06_01,2024-09-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxlogscore=999 adultscore=0 bulkscore=0 priorityscore=1501 lowpriorityscore=0 phishscore=0 clxscore=1015 malwarescore=0 suspectscore=0 mlxscore=0 spamscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2411120000 definitions=main-2412170130 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" The I2C driver gets an interrupt upon transfer completion. When handling multiple messages in a single transfer, this results in N interrupts for N messages, leading to significant software interrupt latency. To mitigate this latency, utilize Block Event Interrupt (BEI) mechanism. Enabling BEI instructs the hardware to prevent interrupt generation and BEI is disabled when an interrupt is necessary. Large I2C transfer can be divided into chunks of 8 messages internally. Interrupts are not expected for the first 7 message completions, only the last message triggers an interrupt, indicating the completion of 8 messages. This BEI mechanism enhances overall transfer efficiency. This optimization reduces transfer time from 168 ms to 48 ms for a series of 200 I2C write messages in a single transfer, with a clock frequency support of 100 kHz. BEI optimizations are currently implemented for I2C write transfers only, as there is no use case for multiple I2C read messages in a single transfer at this time. Signed-off-by: Jyothi Kumar Seerapu --- v3 -> v4: - API's added for Block event interrupt with multi descriptor support for I2C is moved from qcom-gpi-dma.h file to I2C geni qcom driver file. - gpi_multi_xfer_timeout_handler function is moved from GPI driver to I2C driver. - geni_i2c_gpi_multi_desc_xfer structure is added as a member of struct geni_i2c_dev. v2 -> v3: - In i2c_gpi_cb_result function, moved the logic of "!is_tx_multi_xfer" to else. - MIN_NUM_OF_MSGS_MULTI_DESC changed from 4 to 2 - Updated commit description v1 -> v2: - Moved gi2c_gpi_xfer->msg_idx_cnt to separate local variable. - Updated goto labels for error scenarios in geni_i2c_gpi function - memset tx_multi_xfer to 0. - Removed passing current msg index to geni_i2c_gpi - Fixed kernel test robot reported compilation issues. drivers/i2c/busses/i2c-qcom-geni.c | 275 ++++++++++++++++++++++++++--- 1 file changed, 250 insertions(+), 25 deletions(-) diff --git a/drivers/i2c/busses/i2c-qcom-geni.c b/drivers/i2c/busses/i2c-qcom-geni.c index 7a22e1f46e60..7945d86852e9 100644 --- a/drivers/i2c/busses/i2c-qcom-geni.c +++ b/drivers/i2c/busses/i2c-qcom-geni.c @@ -78,6 +78,33 @@ enum geni_i2c_err_code { #define XFER_TIMEOUT HZ #define RST_TIMEOUT HZ +#define QCOM_I2C_GPI_MAX_NUM_MSGS 16 +#define QCOM_I2C_GPI_NUM_MSGS_PER_IRQ 8 +#define QCOM_I2C_MIN_NUM_OF_MSGS_MULTI_DESC 2 + +/** + * struct geni_i2c_gpi_multi_desc_xfer - Used for multi transfer support + * + * @msg_idx_cnt: message index for the transfer + * @buf_idx: dma buffer index + * @unmap_msg_cnt: unmapped transfer index + * @freed_msg_cnt: freed transfer index + * @irq_cnt: received interrupt count + * @irq_msg_cnt: transfer message count for the received irqs + * @dma_buf: virtual addresses of the buffers + * @dma_addr: dma addresses of the buffers + */ +struct geni_i2c_gpi_multi_desc_xfer { + u32 msg_idx_cnt; + u32 buf_idx; + u32 unmap_msg_cnt; + u32 freed_msg_cnt; + u32 irq_cnt; + u32 irq_msg_cnt; + void *dma_buf[QCOM_I2C_GPI_MAX_NUM_MSGS]; + dma_addr_t dma_addr[QCOM_I2C_GPI_MAX_NUM_MSGS]; +}; + struct geni_i2c_dev { struct geni_se se; u32 tx_wm; @@ -100,6 +127,10 @@ struct geni_i2c_dev { struct dma_chan *rx_c; bool gpi_mode; bool abort_done; + bool is_tx_multi_desc_xfer; + u32 num_msgs; + u32 tx_irq_cnt; + struct geni_i2c_gpi_multi_desc_xfer i2c_multi_desc_config; }; struct geni_i2c_desc { @@ -500,6 +531,7 @@ static int geni_i2c_tx_one_msg(struct geni_i2c_dev *gi2c, struct i2c_msg *msg, static void i2c_gpi_cb_result(void *cb, const struct dmaengine_result *result) { struct geni_i2c_dev *gi2c = cb; + struct geni_i2c_gpi_multi_desc_xfer *tx_multi_xfer; if (result->result != DMA_TRANS_NOERROR) { dev_err(gi2c->se.dev, "DMA txn failed:%d\n", result->result); @@ -508,7 +540,22 @@ static void i2c_gpi_cb_result(void *cb, const struct dmaengine_result *result) dev_dbg(gi2c->se.dev, "DMA xfer has pending: %d\n", result->residue); } - complete(&gi2c->done); + if (!gi2c->is_tx_multi_desc_xfer) { + complete(&gi2c->done); + } else { + tx_multi_xfer = &gi2c->i2c_multi_desc_config; + + /* + * Send Completion for last message or multiple of + * QCOM_I2C_GPI_NUM_MSGS_PER_IRQ. + */ + if ((tx_multi_xfer->irq_msg_cnt == gi2c->num_msgs - 1) || + (!((tx_multi_xfer->irq_msg_cnt + 1) % QCOM_I2C_GPI_NUM_MSGS_PER_IRQ))) { + tx_multi_xfer->irq_cnt++; + complete(&gi2c->done); + } + tx_multi_xfer->irq_msg_cnt++; + } } static void geni_i2c_gpi_unmap(struct geni_i2c_dev *gi2c, struct i2c_msg *msg, @@ -526,7 +573,87 @@ static void geni_i2c_gpi_unmap(struct geni_i2c_dev *gi2c, struct i2c_msg *msg, } } -static int geni_i2c_gpi(struct geni_i2c_dev *gi2c, struct i2c_msg *msg, +/** + * geni_i2c_gpi_multi_desc_unmap() - unmaps the buffers post multi message TX transfers + * @dev: pointer to the corresponding dev node + * @gi2c: i2c dev handle + * @msgs: i2c messages array + * @peripheral: pointer to the gpi_i2c_config + */ +static void geni_i2c_gpi_multi_desc_unmap(struct geni_i2c_dev *gi2c, struct i2c_msg msgs[], + struct gpi_i2c_config *peripheral) +{ + u32 msg_xfer_cnt, wr_idx = 0; + struct geni_i2c_gpi_multi_desc_xfer *tx_multi_xfer = &gi2c->i2c_multi_desc_config; + + /* + * In error case, need to unmap all messages based on the msg_idx_cnt. + * Non-error case unmap all the processed messages. + */ + if (gi2c->err) + msg_xfer_cnt = tx_multi_xfer->msg_idx_cnt; + else + msg_xfer_cnt = tx_multi_xfer->irq_cnt * QCOM_I2C_GPI_NUM_MSGS_PER_IRQ; + + /* Unmap the processed DMA buffers based on the received interrupt count */ + for (; tx_multi_xfer->unmap_msg_cnt < msg_xfer_cnt; tx_multi_xfer->unmap_msg_cnt++) { + if (tx_multi_xfer->unmap_msg_cnt == gi2c->num_msgs) + break; + wr_idx = tx_multi_xfer->unmap_msg_cnt % QCOM_I2C_GPI_MAX_NUM_MSGS; + geni_i2c_gpi_unmap(gi2c, &msgs[tx_multi_xfer->unmap_msg_cnt], + tx_multi_xfer->dma_buf[wr_idx], + tx_multi_xfer->dma_addr[wr_idx], + NULL, (dma_addr_t)NULL); + tx_multi_xfer->freed_msg_cnt++; + } +} + +/** + * geni_i2c_gpi_multi_xfer_timeout_handler() - Handle multi message transfer timeout + * @dev: pointer to the corresponding dev node + * @multi_xfer: pointer to the geni_i2c_gpi_multi_desc_xfer + * @num_xfers: total number of transfers + * @transfer_timeout_msecs: transfer timeout value + * @transfer_comp: completion object of the transfer + * + * This function is used to wait for the processed transfers based on + * the interrupts generated upon transfer completion. + * Return: On success returns 0, otherwise return error code (-ETIMEDOUT) + */ +static int geni_i2c_gpi_multi_xfer_timeout_handler(struct device *dev, + struct geni_i2c_gpi_multi_desc_xfer *multi_xfer, + u32 num_xfers, u32 transfer_timeout_msecs, + struct completion *transfer_comp) +{ + int i; + u32 max_irq_cnt, time_left; + + max_irq_cnt = num_xfers / QCOM_I2C_GPI_NUM_MSGS_PER_IRQ; + if (num_xfers % QCOM_I2C_GPI_NUM_MSGS_PER_IRQ) + max_irq_cnt++; + + /* + * Wait for the interrupts of the processed transfers in multiple + * of 8 and for the last transfer. If the hardware is fast and + * already processed all the transfers then no need to wait. + */ + for (i = 0; i < max_irq_cnt; i++) { + reinit_completion(transfer_comp); + if (max_irq_cnt != multi_xfer->irq_cnt) { + time_left = wait_for_completion_timeout(transfer_comp, + transfer_timeout_msecs); + if (!time_left) { + dev_err(dev, "%s: Transfer timeout\n", __func__); + return -ETIMEDOUT; + } + } + if (num_xfers > multi_xfer->msg_idx_cnt) + return 0; + } + return 0; +} + +static int geni_i2c_gpi(struct geni_i2c_dev *gi2c, struct i2c_msg msgs[], struct dma_slave_config *config, dma_addr_t *dma_addr_p, void **buf, unsigned int op, struct dma_chan *dma_chan) { @@ -538,26 +665,48 @@ static int geni_i2c_gpi(struct geni_i2c_dev *gi2c, struct i2c_msg *msg, enum dma_transfer_direction dma_dirn; struct dma_async_tx_descriptor *desc; int ret; + struct geni_i2c_gpi_multi_desc_xfer *gi2c_gpi_xfer; + dma_cookie_t cookie; + u32 msg_idx; peripheral = config->peripheral_config; - - dma_buf = i2c_get_dma_safe_msg_buf(msg, 1); - if (!dma_buf) - return -ENOMEM; + gi2c_gpi_xfer = &gi2c->i2c_multi_desc_config; + dma_buf = gi2c_gpi_xfer->dma_buf[gi2c_gpi_xfer->buf_idx]; + addr = gi2c_gpi_xfer->dma_addr[gi2c_gpi_xfer->buf_idx]; + msg_idx = gi2c_gpi_xfer->msg_idx_cnt; + + dma_buf = i2c_get_dma_safe_msg_buf(&msgs[msg_idx], 1); + if (!dma_buf) { + ret = -ENOMEM; + goto out; + } if (op == I2C_WRITE) map_dirn = DMA_TO_DEVICE; else map_dirn = DMA_FROM_DEVICE; - addr = dma_map_single(gi2c->se.dev->parent, dma_buf, msg->len, map_dirn); + addr = dma_map_single(gi2c->se.dev->parent, dma_buf, + msgs[msg_idx].len, map_dirn); if (dma_mapping_error(gi2c->se.dev->parent, addr)) { - i2c_put_dma_safe_msg_buf(dma_buf, msg, false); - return -ENOMEM; + i2c_put_dma_safe_msg_buf(dma_buf, &msgs[msg_idx], false); + ret = -ENOMEM; + goto out; + } + + if (gi2c->is_tx_multi_desc_xfer) { + if (((msg_idx + 1) % QCOM_I2C_GPI_NUM_MSGS_PER_IRQ)) + peripheral->flags |= QCOM_GPI_BLOCK_EVENT_IRQ; + else + peripheral->flags &= ~QCOM_GPI_BLOCK_EVENT_IRQ; + + /* BEI bit to be cleared for last TRE */ + if (msg_idx == gi2c->num_msgs - 1) + peripheral->flags &= ~QCOM_GPI_BLOCK_EVENT_IRQ; } /* set the length as message for rx txn */ - peripheral->rx_len = msg->len; + peripheral->rx_len = msgs[msg_idx].len; peripheral->op = op; ret = dmaengine_slave_config(dma_chan, config); @@ -575,7 +724,8 @@ static int geni_i2c_gpi(struct geni_i2c_dev *gi2c, struct i2c_msg *msg, else dma_dirn = DMA_DEV_TO_MEM; - desc = dmaengine_prep_slave_single(dma_chan, addr, msg->len, dma_dirn, flags); + desc = dmaengine_prep_slave_single(dma_chan, addr, msgs[msg_idx].len, + dma_dirn, flags); if (!desc) { dev_err(gi2c->se.dev, "prep_slave_sg failed\n"); ret = -EIO; @@ -585,15 +735,48 @@ static int geni_i2c_gpi(struct geni_i2c_dev *gi2c, struct i2c_msg *msg, desc->callback_result = i2c_gpi_cb_result; desc->callback_param = gi2c; - dmaengine_submit(desc); - *buf = dma_buf; - *dma_addr_p = addr; + if (!((msgs[msg_idx].flags & I2C_M_RD) && op == I2C_WRITE)) { + gi2c_gpi_xfer->msg_idx_cnt++; + gi2c_gpi_xfer->buf_idx = (msg_idx + 1) % QCOM_I2C_GPI_MAX_NUM_MSGS; + } + cookie = dmaengine_submit(desc); + if (dma_submit_error(cookie)) { + dev_err(gi2c->se.dev, + "%s: dmaengine_submit failed (%d)\n", __func__, cookie); + ret = -EINVAL; + goto err_config; + } + if (gi2c->is_tx_multi_desc_xfer) { + dma_async_issue_pending(gi2c->tx_c); + if ((msg_idx == (gi2c->num_msgs - 1)) || + (gi2c_gpi_xfer->msg_idx_cnt >= + QCOM_I2C_GPI_MAX_NUM_MSGS + gi2c_gpi_xfer->freed_msg_cnt)) { + ret = geni_i2c_gpi_multi_xfer_timeout_handler(gi2c->se.dev, gi2c_gpi_xfer, + gi2c->num_msgs, XFER_TIMEOUT, + &gi2c->done); + if (ret) { + dev_err(gi2c->se.dev, + "I2C multi write msg transfer timeout: %d\n", + ret); + gi2c->err = ret; + goto err_config; + } + } + } else { + /* Non multi descriptor message transfer */ + *buf = dma_buf; + *dma_addr_p = addr; + } return 0; err_config: - dma_unmap_single(gi2c->se.dev->parent, addr, msg->len, map_dirn); - i2c_put_dma_safe_msg_buf(dma_buf, msg, false); + dma_unmap_single(gi2c->se.dev->parent, addr, + msgs[msg_idx].len, map_dirn); + i2c_put_dma_safe_msg_buf(dma_buf, &msgs[msg_idx], false); + +out: + gi2c->err = ret; return ret; } @@ -605,6 +788,7 @@ static int geni_i2c_gpi_xfer(struct geni_i2c_dev *gi2c, struct i2c_msg msgs[], i unsigned long time_left; dma_addr_t tx_addr, rx_addr; void *tx_buf = NULL, *rx_buf = NULL; + struct geni_i2c_gpi_multi_desc_xfer *tx_multi_xfer; const struct geni_i2c_clk_fld *itr = gi2c->clk_fld; config.peripheral_config = &peripheral; @@ -618,6 +802,33 @@ static int geni_i2c_gpi_xfer(struct geni_i2c_dev *gi2c, struct i2c_msg msgs[], i peripheral.set_config = 1; peripheral.multi_msg = false; + gi2c->num_msgs = num; + gi2c->is_tx_multi_desc_xfer = false; + gi2c->tx_irq_cnt = 0; + + tx_multi_xfer = &gi2c->i2c_multi_desc_config; + memset(tx_multi_xfer, 0, sizeof(struct geni_i2c_gpi_multi_desc_xfer)); + + /* + * If number of write messages are two and higher then + * configure hardware for multi descriptor transfers with BEI. + */ + if (num >= QCOM_I2C_MIN_NUM_OF_MSGS_MULTI_DESC) { + gi2c->is_tx_multi_desc_xfer = true; + for (i = 0; i < num; i++) { + if (msgs[i].flags & I2C_M_RD) { + /* + * Multi descriptor transfer with BEI + * support is enabled for write transfers. + * TODO: Add BEI optimization support for + * read transfers later. + */ + gi2c->is_tx_multi_desc_xfer = false; + break; + } + } + } + for (i = 0; i < num; i++) { gi2c->cur = &msgs[i]; gi2c->err = 0; @@ -628,14 +839,16 @@ static int geni_i2c_gpi_xfer(struct geni_i2c_dev *gi2c, struct i2c_msg msgs[], i peripheral.stretch = 1; peripheral.addr = msgs[i].addr; + if (i > 0 && (!(msgs[i].flags & I2C_M_RD))) + peripheral.multi_msg = false; - ret = geni_i2c_gpi(gi2c, &msgs[i], &config, + ret = geni_i2c_gpi(gi2c, msgs, &config, &tx_addr, &tx_buf, I2C_WRITE, gi2c->tx_c); if (ret) goto err; if (msgs[i].flags & I2C_M_RD) { - ret = geni_i2c_gpi(gi2c, &msgs[i], &config, + ret = geni_i2c_gpi(gi2c, msgs, &config, &rx_addr, &rx_buf, I2C_READ, gi2c->rx_c); if (ret) goto err; @@ -643,18 +856,26 @@ static int geni_i2c_gpi_xfer(struct geni_i2c_dev *gi2c, struct i2c_msg msgs[], i dma_async_issue_pending(gi2c->rx_c); } - dma_async_issue_pending(gi2c->tx_c); - - time_left = wait_for_completion_timeout(&gi2c->done, XFER_TIMEOUT); - if (!time_left) - gi2c->err = -ETIMEDOUT; + if (!gi2c->is_tx_multi_desc_xfer) { + dma_async_issue_pending(gi2c->tx_c); + time_left = wait_for_completion_timeout(&gi2c->done, XFER_TIMEOUT); + if (!time_left) { + dev_err(gi2c->se.dev, "%s:I2C timeout\n", __func__); + gi2c->err = -ETIMEDOUT; + } + } if (gi2c->err) { ret = gi2c->err; goto err; } - geni_i2c_gpi_unmap(gi2c, &msgs[i], tx_buf, tx_addr, rx_buf, rx_addr); + if (!gi2c->is_tx_multi_desc_xfer) { + geni_i2c_gpi_unmap(gi2c, &msgs[i], tx_buf, tx_addr, rx_buf, rx_addr); + } else if (gi2c->tx_irq_cnt != tx_multi_xfer->irq_cnt) { + gi2c->tx_irq_cnt = tx_multi_xfer->irq_cnt; + geni_i2c_gpi_multi_desc_unmap(gi2c, msgs, &peripheral); + } } return num; @@ -663,7 +884,11 @@ static int geni_i2c_gpi_xfer(struct geni_i2c_dev *gi2c, struct i2c_msg msgs[], i dev_err(gi2c->se.dev, "GPI transfer failed: %d\n", ret); dmaengine_terminate_sync(gi2c->rx_c); dmaengine_terminate_sync(gi2c->tx_c); - geni_i2c_gpi_unmap(gi2c, &msgs[i], tx_buf, tx_addr, rx_buf, rx_addr); + if (gi2c->is_tx_multi_desc_xfer) + geni_i2c_gpi_multi_desc_unmap(gi2c, msgs, &peripheral); + else + geni_i2c_gpi_unmap(gi2c, &msgs[i], tx_buf, tx_addr, rx_buf, rx_addr); + return ret; }