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Mon, 13 Jul 2026 00:27:10 -0700 (PDT) X-Received: by 2002:a05:6a00:a117:b0:848:824d:aff4 with SMTP id d2e1a72fcca58-848896fee6fmr6817067b3a.56.1783927630381; Mon, 13 Jul 2026 00:27:10 -0700 (PDT) Received: from [10.217.219.169] ([202.46.22.19]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-84a15e36158sm2055595b3a.47.2026.07.13.00.27.06 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 13 Jul 2026 00:27:09 -0700 (PDT) Message-ID: Date: Mon, 13 Jul 2026 12:57:04 +0530 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 5/7] bus: mhi: Load DDR training data using device serial number To: Manivannan Sadhasivam Cc: Jonathan Corbet , Shuah Khan , Jeff Hugo , Carl Vanderlip , Oded Gabbay , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, mhi@lists.linux.dev References: <20260701-sahara_protocol_new_v2-v6-0-3a78362c4741@oss.qualcomm.com> <20260701-sahara_protocol_new_v2-v6-5-3a78362c4741@oss.qualcomm.com> Content-Language: en-US From: Kishore Batta In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Info: AW1haW4tMjYwNzEzMDA3NSBTYWx0ZWRfXzrQ5Kcp0aalY Y30mNaeIJ6nlVG2fzn+Gs2XoeftGdBtHu/QJLsAx248UqVSvzdNHBKS5O2DCfGhljku025RYzYW Wt2HPl0SUvPkOlcS7bImBDo5Lyl/x6Y= X-Proofpoint-GUID: qdrOK7hczF4vMGZkbfZVPSBZHdYBcJ-8 X-Authority-Analysis: v=2.4 cv=a7UAM0SF c=1 sm=1 tr=0 ts=6a54934f cx=c_pps a=Oh5Dbbf/trHjhBongsHeRQ==:117 a=fChuTYTh2wq5r3m49p7fHw==:17 a=IkcTkHD0fZMA:10 a=RAioF0-LDSMA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=yx91gb_oNiZeI1HMLzn7:22 a=EUspDBNiAAAA:8 a=BmEjwzUHSYKQsWGf9k0A:9 a=QEXdDO2ut3YA:10 a=_Vgx9l1VpLgwpw_dHYaR:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzEzMDA3NSBTYWx0ZWRfX5fzwHtAHneTF fyrQUkLEmoRXkmVsYHNvKEJjXap75c25w0aakCkia9AlF4n+dlS7R/4gWfwn1q2J+43UTyGx6ne nGB7u/G9YWk6APZTYxQ4mry0qVW4yMWzJyb1FKhPSu5FcxyELa0uh7OugnIipH4lNni4M5pqE1/ OmwLj5a6wSH1k8aCOX//aMM04OjO+8zLVxPWTIE0/6/YLW+KvVYRJu2NenpYHa+DS9JF2DoismN LzgWt2ROU29bnRG+IFG5ifD5CW8Pl6+L70rEdnX1ezaofWpipErtW5VEw9p+cl+o0DUvd9+KKOK tgfRQfYnHAPbGYCSXC4faLQi6FV1isVw0XCbGRyLfyRg++XZr58lQ88FTxbZEexQLX0LCz33bqe gqb5QUmXD0ZYbNL/tZUesVqdoaHaSqQ1xGe0sgU2YLmYdmRx3ViK5VwSgO0IcAEXpRBoYtjv5oU sxoL/JBBj4Ngd1o8Y1w== X-Proofpoint-ORIG-GUID: qdrOK7hczF4vMGZkbfZVPSBZHdYBcJ-8 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-13_02,2026-07-10_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 phishscore=0 priorityscore=1501 malwarescore=0 adultscore=0 clxscore=1015 spamscore=0 suspectscore=0 lowpriorityscore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607130075 On 7/9/2026 11:51 AM, Manivannan Sadhasivam wrote: > On Wed, Jul 01, 2026 at 04:07:39PM +0530, Kishore Batta wrote: >> Devices may provide device specific DDR training data that can be reused >> across boot to avoid retraining and reduce boot time. The Sahara driver >> currently always falls back to the default DDR training image, even when >> serial specific training data is available. >> >> Extend the firmware loading logic for the DDR training image to first >> attempt loading a per-device image dervied from the device serial number. >> If the serial-specific image is not present, fall back to the existing >> default image, preserving current behavior. >> >> This allows reuse of previously generated DDR training data when available, >> while keeping the existing training flow unchanged for devices without >> saved data or for all other firmware images. >> >> Signed-off-by: Kishore Batta >> --- >> drivers/bus/mhi/host/clients/sahara/sahara.c | 25 ++++++++++++++++++++++++- >> 1 file changed, 24 insertions(+), 1 deletion(-) >> >> diff --git a/drivers/bus/mhi/host/clients/sahara/sahara.c b/drivers/bus/mhi/host/clients/sahara/sahara.c >> index 9adbd84859073d8024ba2a5fcfa33897439d6759..b5ca6353540dc3815db6539e7424afdb749fd3f6 100644 >> --- a/drivers/bus/mhi/host/clients/sahara/sahara.c >> +++ b/drivers/bus/mhi/host/clients/sahara/sahara.c >> @@ -59,6 +59,7 @@ >> #define SAHARA_RESET_LENGTH 0x8 >> #define SAHARA_MEM_DEBUG64_LENGTH 0x18 >> #define SAHARA_MEM_READ64_LENGTH 0x18 >> +#define SAHARA_DDR_TRAINING_IMG_ID 34 >> >> struct sahara_packet { >> __le32 cmd; >> @@ -226,6 +227,27 @@ static int sahara_find_image(struct sahara_context *context, u32 image_id) >> return 0; >> } >> >> + /* DDR training special case: Try per-serial number file first */ >> + if (image_id == SAHARA_DDR_TRAINING_IMG_ID && context->fw_folder) { >> + u32 serial_num = context->mhi_dev->mhi_cntrl->serial_number; >> + >> + fw_path = kasprintf(GFP_KERNEL, >> + "qcom/%s/mdmddr_0x%x.mbn", >> + context->fw_folder, serial_num); >> + if (!fw_path) >> + return -ENOMEM; >> + >> + ret = firmware_request_nowarn(&context->firmware, >> + fw_path, >> + &context->mhi_dev->dev); >> + kfree(fw_path); >> + >> + if (!ret) { >> + context->active_image_id = image_id; >> + return 0; >> + } >> + } >> + >> /* >> * This image might be optional. The device may continue without it. >> * Only the device knows. Suppress error messages that could suggest an >> @@ -235,7 +257,8 @@ static int sahara_find_image(struct sahara_context *context, u32 image_id) >> context->image_table[image_id], >> &context->mhi_dev->dev); >> if (ret) { >> - dev_dbg(&context->mhi_dev->dev, "request for image id %d / file %s failed %d\n", >> + dev_dbg(&context->mhi_dev->dev, >> + "request for image id %d / file %s failed %d\n", > Spurious change. > > - Mani ACK. Will remove it in next version.