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[129.46.96.20]) by smtp.gmail.com with ESMTPSA id 5614622812f47-464bb604f5esm9288908b6e.18.2026.03.03.01.02.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 03 Mar 2026 01:02:22 -0800 (PST) From: Qiang Yu Date: Tue, 03 Mar 2026 01:02:13 -0800 Subject: [PATCH v2 1/2] bus: mhi: host: pci_generic: Switch to async power up to avoid boot delays Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260303-b4-async_power_on-v2-1-d3db81eb457d@oss.qualcomm.com> References: <20260303-b4-async_power_on-v2-0-d3db81eb457d@oss.qualcomm.com> In-Reply-To: <20260303-b4-async_power_on-v2-0-d3db81eb457d@oss.qualcomm.com> To: Manivannan Sadhasivam , Qiang Yu , Hemant Kumar , Bhaumik Bhatt , Loic Poulain Cc: mhi@lists.linux.dev, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, Qiang Yu , stable@vger.kernel.org X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1772528541; l=1362; i=qiang.yu@oss.qualcomm.com; s=20250513; h=from:subject:message-id; bh=3jdrSYFufk9+/Tbwq5b4Vodf1OshkwsP1bTuXFhDNRo=; b=X/rlUdXBoLu+hAOze8ikgPO4qyNqDrZJcCS1nj63JaJ3DTc0/gu4BxxQkxD9GFoRSBQADLd/q j+Fl1Imy8hPDLMIPr3P1RQytOeOcw7ZIvK0RRMEOtcc1ej8nIOGmqKA X-Developer-Key: i=qiang.yu@oss.qualcomm.com; a=ed25519; pk=Rr94t+fykoieF1ngg/bXxEfr5KoQxeXPtYxM8fBQTAI= X-Authority-Analysis: v=2.4 cv=P7E3RyAu c=1 sm=1 tr=0 ts=69a6a3a1 cx=c_pps a=AKZTfHrQPB8q3CcvmcIuDA==:117 a=ouPCqIW2jiPt+lZRy3xVPw==:17 a=yFp2A1wA7JFfkWW7:21 a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=YMgV9FUhrdKAYTUUvYB2:22 a=VwQbUJbxAAAA:8 a=EUspDBNiAAAA:8 a=xQtohAntiWRCc_MJuAAA:9 a=QEXdDO2ut3YA:10 a=pF_qn-MSjDawc0seGVz6:22 X-Proofpoint-GUID: JLiGVXqLZABdIKeajAeO_T7dfiClX3vG X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzAzMDA2NiBTYWx0ZWRfXx+L/2DyGU/0J lzyQHXmCz7um8Wz5AvsaLLaHtBp4lw4Bsv/c23Ss9N3eN5+DnQQRX0RgEuF/SejPr/oRKP4SraX xaOR4kBKY8yEbevvPMx2dR89Xfgzf3ALDSIQkSUGwKO5MP+VyXJwtl8i4HC9eeykAP103jSqC/s X0Yjnu4yO6n/hvdtaDjzR93ie0hQwx8YV8X4X6YlBiRO/+N1DrW3/HRu5Ju8kKI9256o7m6jkLx NICP4Edl35jpKKHr5Hw5+lzNoFH/69ifVFe3cg62U3u7vtAG54N/AXriiP0cARE42R7uHziDbZM d6qGhEbLQBWD9NA584UChKDChQ3ECKR/O8J5kuSW+QXQw1VqqCe9++YVtBhPjEQgA5JXLM1j/Jb AV2u7VdUdgS2VgCFA6+IOF8KzhIDL1Pqja+V3H/ZVRN0PXATnsZNtQbUkT3aYdHz5V34EpeYTgX 4TIgyaUKT4ykSqd7L4Q== X-Proofpoint-ORIG-GUID: JLiGVXqLZABdIKeajAeO_T7dfiClX3vG X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-03-02_05,2026-03-03_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 clxscore=1015 malwarescore=0 adultscore=0 bulkscore=0 spamscore=0 priorityscore=1501 lowpriorityscore=0 impostorscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2602130000 definitions=main-2603030066 Some modem devices can take significant time (up to 20 secs for sdx75) to enter mission mode during initialization. Currently, mhi_sync_power_up() waits for this entire process to complete, blocking other driver probes and delaying system boot. Switch to mhi_async_power_up() so probe can return immediately while MHI initialization continues in the background. This eliminates lengthy boot delays and allows other drivers to probe in parallel, improving overall system boot performance. Fixes: 5571519009d0 ("bus: mhi: host: pci_generic: Add SDX75 based modem support") Cc: stable@vger.kernel.org Signed-off-by: Qiang Yu --- drivers/bus/mhi/host/pci_generic.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/bus/mhi/host/pci_generic.c b/drivers/bus/mhi/host/pci_generic.c index 425362037830ea9ef30acab748b07f04e47f3d90..0395a8ea52b0e874209ca56cd20ed04419038cdb 100644 --- a/drivers/bus/mhi/host/pci_generic.c +++ b/drivers/bus/mhi/host/pci_generic.c @@ -1405,7 +1405,7 @@ static int mhi_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) goto err_unregister; } - err = mhi_sync_power_up(mhi_cntrl); + err = mhi_async_power_up(mhi_cntrl); if (err) { dev_err(&pdev->dev, "failed to power up MHI controller\n"); goto err_unprepare; -- 2.34.1