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Mon, 13 Apr 2026 02:05:27 -0700 (PDT) X-Received: by 2002:a05:6a20:3953:b0:398:7eea:50a0 with SMTP id adf61e73a8af0-39fe3da99c8mr14281886637.18.1776071127179; Mon, 13 Apr 2026 02:05:27 -0700 (PDT) Received: from [192.168.0.215] ([49.205.244.213]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-c79218fc7e7sm9366906a12.10.2026.04.13.02.05.23 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 13 Apr 2026 02:05:26 -0700 (PDT) Message-ID: <62078c92-ab6e-46ca-85b6-ff02b8b4cdf3@oss.qualcomm.com> Date: Mon, 13 Apr 2026 14:35:21 +0530 Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 7/9] bus: mhi: Capture DDR training data using command mode To: Jeff Hugo , Jonathan Corbet , Shuah Khan , Carl Vanderlip , Oded Gabbay , Manivannan Sadhasivam , andersson@kernel.org Cc: 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: <20260319-sahara_protocol_new_v2-v4-0-47ad79308762@oss.qualcomm.com> <20260319-sahara_protocol_new_v2-v4-7-47ad79308762@oss.qualcomm.com> <031702af-5976-438a-841a-48e95f41eb03@oss.qualcomm.com> Content-Language: en-US From: Kishore Batta In-Reply-To: <031702af-5976-438a-841a-48e95f41eb03@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Authority-Analysis: v=2.4 cv=bcFbluPB c=1 sm=1 tr=0 ts=69dcb1d9 cx=c_pps a=oF/VQ+ItUULfLr/lQ2/icg==:117 a=KtsNJ/6bKgz7QsArn2OSsQ==:17 a=IkcTkHD0fZMA:10 a=A5OVakUREuEA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=3WHJM1ZQz_JShphwDgj5:22 a=EUspDBNiAAAA:8 a=VNyJVnxpnutqXYa9aisA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=3WC7DwWrALyhR5TkjVHa:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDEzMDA4OCBTYWx0ZWRfX6yeTSsocsKlp 3es9JvjNUWiHwwrbfva/Mal9uh5G+B5iV+l7HL/IwyurWgCDjKUCjDE1ueET4W1TGtt/WcJyF4e 8jqVZd88T4l1Sc/5xzy4ZHvfTqqkKvl5nJhl65hRHWOoxfJ9xoxIPft8BSyw6qJAh/vRgB2cj63 69Ok4i5/KX/PwSR/Svl1A8ccGyegu3b9hqdtGxsWkcWPF9T2SeRaQMrXKJhcKmfVCf0eB7DYijA SugYdTS/OTmKtynk6mg0PJS8ljsr4YmhdndkqbTD4+2ivF3xzbhJflNUe6j8Ja+JmSZ6JUV4xoR LZi3t9PFNXTn6RzbM8UVi66RRdMiW9wKdQkg9h2fXXtPrRgvphCnLvK1eLg7COiJP65cg913mOB yaPLyYZHij4rA0jjdq1/Few63rmfcFQ5+YuMv00ysCMxvh4241lyxX2lvhPQ4uUZTfl4F0wqQfj gPXX1zFFJgoaR68qFiQ== X-Proofpoint-ORIG-GUID: oy8n6fbYXMgvVLcECfgI-hJ8eA_qVIG4 X-Proofpoint-GUID: oy8n6fbYXMgvVLcECfgI-hJ8eA_qVIG4 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-04-13_02,2026-04-09_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 clxscore=1015 impostorscore=0 malwarescore=0 suspectscore=0 adultscore=0 bulkscore=0 phishscore=0 priorityscore=1501 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604010000 definitions=main-2604130088 On 4/10/2026 2:57 AM, Jeff Hugo wrote: > On 3/19/2026 12:31 AM, Kishore Batta wrote: >> During early boot, devices may perform DDR training and produce training >> data that can be reused on subsequent boots to reduce initialization >> time. The sahara protocol provides a command mode flow to transfer this > > Sahara ACK. Will correct it. > >> training data to the host, but the driver currently does not handle >> command mode and drops the training payload. >> >> Add Sahara command mode support to retrieve DDR training data from the >> device. When the device enters command mode and sends CMD_READY, query >> the support command list and request DDR training data using EXECUTE and >> EXECUTE_DATA. Allocate receive buffers based on the reported response >> size and copy the raw payload directly from the MHI DL completion >> callback. >> >> Store the captured training data in controller-scoped memory using >> devres, >> so it remains available after sahara channel teardown. Also distinguish > > Sahara ACK. Will correct it. > >> raw payload completion from control packets in the DL callback, avoiding >> misinterpretation of training data as protocol messages, and requeue >> the RX buffer after switching back to IMAGE_TX_PENDING to allow the >> boot flow to continue. >> >> Signed-off-by: Kishore Batta >> --- >>   drivers/bus/mhi/sahara/sahara.c | 328 >> +++++++++++++++++++++++++++++++++++++++- >>   1 file changed, 320 insertions(+), 8 deletions(-) >> >> diff --git a/drivers/bus/mhi/sahara/sahara.c >> b/drivers/bus/mhi/sahara/sahara.c >> index >> 0a0f578aaa47ab2c4ca0765666b392fb9936ddd5..c88f1220199ac4373d3552167870c19a0d5f23b9 >> 100644 >> --- a/drivers/bus/mhi/sahara/sahara.c >> +++ b/drivers/bus/mhi/sahara/sahara.c >> @@ -5,11 +5,14 @@ >>    */ >>     #include >> +#include >> +#include >>   #include >>   #include >>   #include >>   #include >>   #include >> +#include >>   #include >>   #include >>   #include >> @@ -60,8 +63,16 @@ >>   #define SAHARA_RESET_LENGTH        0x8 >>   #define SAHARA_MEM_DEBUG64_LENGTH    0x18 >>   #define SAHARA_MEM_READ64_LENGTH    0x18 >> - >> +#define SAHARA_COMMAND_READY_LENGTH    0x8 >> +#define SAHARA_COMMAND_EXEC_RESP_LENGTH    0x10 >> +#define SAHARA_COMMAND_EXECUTE_LENGTH    0xc >> +#define SAHARA_COMMAND_EXEC_DATA_LENGTH    0xc >> +#define SAHARA_SWITCH_MODE_LENGTH    0xc >> + >> +#define SAHARA_EXEC_CMD_GET_COMMAND_ID_LIST    0x8 >> +#define SAHARA_EXEC_CMD_GET_TRAINING_DATA    0x9 >>   #define SAHARA_DDR_TRAINING_IMG_ID    34 > > Why is the indentation of this line messed up? ACK. Will correct it. > >> +#define SAHARA_NUM_CMD_BUF SAHARA_NUM_TX_BUF >>     struct sahara_packet { >>       __le32 cmd; >> @@ -97,6 +108,19 @@ struct sahara_packet { >>               __le64 memory_address; >>               __le64 memory_length; >>           } memory_read64; >> +        struct { >> +            __le32 client_command; >> +        } command_execute; >> +        struct { >> +            __le32 client_command; >> +            __le32 response_length; >> +        } command_execute_resp; >> +        struct { >> +            __le32 client_command; >> +        } command_exec_data; >> +        struct { >> +            __le32 mode; >> +        } mode_switch; >>       }; >>   }; >>   @@ -163,6 +187,7 @@ struct sahara_context { >>       struct work_struct        fw_work; >>       struct work_struct        dump_work; >>       struct work_struct        read_data_work; >> +    struct work_struct        cmd_work; >>       struct mhi_device        *mhi_dev; >>       const char * const        *image_table; >>       u32                table_size; >> @@ -183,6 +208,24 @@ struct sahara_context { >>       bool                is_mem_dump_mode; >>       bool                non_streaming; >>       const char            *fw_folder; >> +    bool                is_cmd_mode; >> +    bool                receiving_trng_data; > > You already spell out "receiving", spell out "training".  I don't > recall seeing "trng" before so it seems like a really uncommon shortform. ACK. Will correct it. > >> +    size_t                trng_size; >> +    size_t                trng_rcvd; >> +    u32                trng_nbuf; >> +    char                *cmd_buff[SAHARA_NUM_CMD_BUF]; >> +};