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GET /api/patches/2216201/?format=api
{ "id": 2216201, "url": "http://patchwork.ozlabs.org/api/patches/2216201/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-i2c/patch/20260326-skip_extra_dma_tre-v1-1-deef018895dc@oss.qualcomm.com/", "project": { "id": 35, "url": "http://patchwork.ozlabs.org/api/projects/35/?format=api", "name": "Linux I2C development", "link_name": "linux-i2c", "list_id": "linux-i2c.vger.kernel.org", "list_email": "linux-i2c@vger.kernel.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260326-skip_extra_dma_tre-v1-1-deef018895dc@oss.qualcomm.com>", "list_archive_url": null, "date": "2026-03-26T04:31:48", "name": "[v1] i2c: qcom-geni: Skip extra TX DMA TRE for single read message in GPI mode", "commit_ref": null, "pull_url": null, "state": "under-review", "archived": false, "hash": "f9b2290e28ece9db5f78e12d2406d1fef01de33c", "submitter": { "id": 92974, "url": "http://patchwork.ozlabs.org/api/people/92974/?format=api", "name": "Aniket Randive", "email": "aniket.randive@oss.qualcomm.com" }, "delegate": { "id": 149066, "url": "http://patchwork.ozlabs.org/api/users/149066/?format=api", "username": "cazzacarna", "first_name": "Andi", "last_name": "Shyti", "email": "andi.shyti@kernel.org" }, "mbox": "http://patchwork.ozlabs.org/project/linux-i2c/patch/20260326-skip_extra_dma_tre-v1-1-deef018895dc@oss.qualcomm.com/mbox/", "series": [ { "id": 497533, "url": "http://patchwork.ozlabs.org/api/series/497533/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-i2c/list/?series=497533", "date": "2026-03-26T04:31:48", "name": "[v1] i2c: qcom-geni: Skip extra TX DMA TRE for single read message in GPI mode", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/497533/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2216201/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2216201/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linux-i2c+bounces-16789-incoming=patchwork.ozlabs.org@vger.kernel.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linux-i2c@vger.kernel.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=qualcomm.com header.i=@qualcomm.com header.a=rsa-sha256\n header.s=qcppdkim1 header.b=hKKR2OBd;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com\n header.a=rsa-sha256 header.s=google header.b=jRKyNcVa;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c0a:e001:db::12fc:5321; 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charset=\"utf-8\"", "Content-Transfer-Encoding": "7bit", "Message-Id": "<20260326-skip_extra_dma_tre-v1-1-deef018895dc@oss.qualcomm.com>", "X-B4-Tracking": "v=1; b=H4sIALO2xGkC/yWM0QqDMAwAf0XyvIKNOLb9yhiltqnLxpwkVQTx3\n +3m4x3craAkTAq3agWhmZW/QwF7qiA8/dCT4VgYsMZz3WBr9M2joyWLd/HjXRYyvgkJMV1svHZ\n QwlEo8fKf3mG28DicTt2LQv7dYNt26Um64XoAAAA=", "X-Change-ID": "20260325-skip_extra_dma_tre-a3cf22f81d9b", "To": "Mukesh Kumar Savaliya <mukesh.savaliya@oss.qualcomm.com>,\n Viken Dadhaniya <viken.dadhaniya@oss.qualcomm.com>,\n Andi Shyti <andi.shyti@kernel.org>, Sumit Semwal <sumit.semwal@linaro.org>,\n\t=?utf-8?q?Christian_K=C3=B6nig?= <christian.koenig@amd.com>", "Cc": "linux-i2c@vger.kernel.org, linux-arm-msm@vger.kernel.org,\n linux-kernel@vger.kernel.org, linux-media@vger.kernel.org,\n dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org,\n Maramaina Naresh <naresh.maramaina@oss.qualcomm.com>,\n Aniket Randive <aniket.randive@oss.qualcomm.com>", "X-Mailer": "b4 0.15.1", "X-Developer-Signature": "v=1; a=ed25519-sha256; t=1774499512; l=2657;\n i=aniket.randive@oss.qualcomm.com; s=20260325; h=from:subject:message-id;\n bh=NpFXvrYh3Fb7+pGlr/Z61Pb78xmA51Vjq3Rxx3qOVtg=;\n b=F4oCSfY3o5eliC5a/9PowUrf5FxpGtSwz/W4vzzQWSTjf14iwuzX8WrayFTCnK9XM9yo9kEL2\n Iw5BwmRKNyMAZKpj1OK+i5GLjGWoi4vXfVo03bhtCg3FGxQGx7hFxXK", "X-Developer-Key": "i=aniket.randive@oss.qualcomm.com; a=ed25519;\n pk=4o37X1ZqGbCO/T2SR8kq/HnWvq0yb1RUlFuNukovbQk=", "X-Authority-Analysis": "v=2.4 cv=Vdr6/Vp9 c=1 sm=1 tr=0 ts=69c4b6be cx=c_pps\n a=Qgeoaf8Lrialg5Z894R3/Q==:117 a=fChuTYTh2wq5r3m49p7fHw==:17\n a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=s4-Qcg_JpJYA:10\n a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=gowsoOTTUOVcmtlkKump:22\n a=EUspDBNiAAAA:8 a=QTaY6CSZEmO6sGPGzGoA:9 a=QEXdDO2ut3YA:10\n a=x9snwWr2DeNwDh03kgHS:22", "X-Proofpoint-ORIG-GUID": "wixJuHoT9BxSz3wfbUmmaJZSBgDe9b3B", "X-Proofpoint-GUID": "wixJuHoT9BxSz3wfbUmmaJZSBgDe9b3B", "X-Proofpoint-Spam-Details-Enc": "AW1haW4tMjYwMzI2MDAzMiBTYWx0ZWRfXz0aRYbpLQbRT\n xCKzHBTmcTsLYog05zyEzkogull5djMa4lI35zs26EJUZmf38PKN2sKO9Xc8H2BEqNfrJ4lkVl9\n 4aPU/RLRtN4C8EvHUl2yfWhiwL2QxavF16Ur1XCLWYqX7C54FMIbwANpZCSXPM3r9ZbLyKxfL+2\n PbmU8LZ+zUS30lkIQCWEJZWIhzEyQDb+Jc+lJNlWhgpIIc0Brpn/FlItN6ja9LNviY+96c3fiG0\n 87vMlF80JxRqk41yBL3nGejaUe4oOC+/4v5CbpSXY05AyT4jbhLw4aogDHzKfbqAw7W4yzIVtvl\n 3W5CQVaPwuC8UoI6J8z/o7LGcuMXlircKZp4O0nHL9kroEitiDS6Ele7BM31lpL6cdn7Pggo0Qm\n 8LEoEo3aUj7SZje949IWoOpDEr3bUysYdfFUL9Y7G86I3VeB0XTL0TfnlcJ/ByFQcPbEUd1qd9D\n Fkkn6MHsM2p36wh/xmQ==", "X-Proofpoint-Virus-Version": "vendor=baseguard\n engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49\n definitions=2026-03-26_01,2026-03-24_01,2025-10-01_01", "X-Proofpoint-Spam-Details": "rule=outbound_notspam policy=outbound score=0\n phishscore=0 bulkscore=0 malwarescore=0 spamscore=0 lowpriorityscore=0\n suspectscore=0 clxscore=1011 adultscore=0 impostorscore=0 priorityscore=1501\n classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0\n reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2603260032" }, "content": "In GPI mode, the I2C GENI driver incorrectly generates an extra TX DMA\nTRE on the TX channel during single read message transfer. This results\nin an unnecessary write operation on the I2C bus, which is not required.\n\nUpdate the logic to avoid generating the extra TX DMA TRE for single\nread message, ensuring correct behavior and preventing redundant\ntransfers.\n\nCo-developed-by: Maramaina Naresh <naresh.maramaina@oss.qualcomm.com>\nSigned-off-by: Maramaina Naresh <naresh.maramaina@oss.qualcomm.com>\nSigned-off-by: Aniket Randive <aniket.randive@oss.qualcomm.com>\n---\n drivers/i2c/busses/i2c-qcom-geni.c | 18 +++++++++++++-----\n 1 file changed, 13 insertions(+), 5 deletions(-)\n\n\n---\nbase-commit: 785f0eb2f85decbe7c1ef9ae922931f0194ffc2e\nchange-id: 20260325-skip_extra_dma_tre-a3cf22f81d9b\n\nBest regards,\n-- \nAniket Randive <aniket.randive@oss.qualcomm.com>", "diff": "diff --git a/drivers/i2c/busses/i2c-qcom-geni.c b/drivers/i2c/busses/i2c-qcom-geni.c\nindex a4acb78fafb6..2706309bbebb 100644\n--- a/drivers/i2c/busses/i2c-qcom-geni.c\n+++ b/drivers/i2c/busses/i2c-qcom-geni.c\n@@ -625,8 +625,8 @@ static int geni_i2c_gpi(struct geni_i2c_dev *gi2c, struct i2c_msg msgs[],\n {\n \tstruct gpi_i2c_config *peripheral;\n \tunsigned int flags;\n-\tvoid *dma_buf;\n-\tdma_addr_t addr;\n+\tvoid *dma_buf = NULL;\n+\tdma_addr_t addr = 0;\n \tenum dma_data_direction map_dirn;\n \tenum dma_transfer_direction dma_dirn;\n \tstruct dma_async_tx_descriptor *desc;\n@@ -639,6 +639,11 @@ static int geni_i2c_gpi(struct geni_i2c_dev *gi2c, struct i2c_msg msgs[],\n \tgi2c_gpi_xfer = &gi2c->i2c_multi_desc_config;\n \tmsg_idx = gi2c_gpi_xfer->msg_idx_cnt;\n \n+\tif (op == I2C_WRITE && msgs[msg_idx].flags & I2C_M_RD) {\n+\t\tperipheral->multi_msg = true;\n+\t\tgoto skip_dma;\n+\t}\n+\n \tdma_buf = i2c_get_dma_safe_msg_buf(&msgs[msg_idx], 1);\n \tif (!dma_buf) {\n \t\tret = -ENOMEM;\n@@ -668,6 +673,7 @@ static int geni_i2c_gpi(struct geni_i2c_dev *gi2c, struct i2c_msg msgs[],\n \t\tflags = DMA_PREP_INTERRUPT | DMA_CTRL_ACK;\n \t}\n \n+skip_dma:\n \t/* set the length as message for rx txn */\n \tperipheral->rx_len = msgs[msg_idx].len;\n \tperipheral->op = op;\n@@ -740,9 +746,11 @@ static int geni_i2c_gpi(struct geni_i2c_dev *gi2c, struct i2c_msg msgs[],\n \treturn 0;\n \n err_config:\n-\tdma_unmap_single(gi2c->se.dev->parent, addr,\n-\t\t\t msgs[msg_idx].len, map_dirn);\n-\ti2c_put_dma_safe_msg_buf(dma_buf, &msgs[msg_idx], false);\n+\tif (op == I2C_WRITE && (msgs[msg_idx].flags & I2C_M_RD)) {\n+\t\tdma_unmap_single(gi2c->se.dev->parent, addr,\n+\t\t\t\t msgs[msg_idx].len, map_dirn);\n+\t\ti2c_put_dma_safe_msg_buf(dma_buf, &msgs[msg_idx], false);\n+\t}\n \n out:\n \tgi2c->err = ret;\n", "prefixes": [ "v1" ] }