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Mon, 13 Apr 2026 02:04:15 -0700 (PDT) X-Received: by 2002:a17:903:4405:b0:2ae:5629:ac55 with SMTP id d9443c01a7336-2b2d5a30ae9mr127536505ad.21.1776071055320; Mon, 13 Apr 2026 02:04:15 -0700 (PDT) Received: from [192.168.0.215] ([49.205.244.213]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2b2d4f0a39fsm106272495ad.48.2026.04.13.02.04.11 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 13 Apr 2026 02:04:15 -0700 (PDT) Message-ID: Date: Mon, 13 Apr 2026 14:34:10 +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 4/9] bus: mhi: Centralize firmware image table selection at probe time 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-v4-4-47ad79308762@oss.qualcomm.com> <2eda7d10-e4a9-4ca7-ae73-bf9c0ca8fa33@oss.qualcomm.com> Content-Language: en-US From: Kishore Batta In-Reply-To: <2eda7d10-e4a9-4ca7-ae73-bf9c0ca8fa33@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Proofpoint-GUID: kTeVSyEbg6dkN2WnLX8HSrw367kgwOZ2 X-Authority-Analysis: v=2.4 cv=OpZ/DS/t c=1 sm=1 tr=0 ts=69dcb190 cx=c_pps a=cmESyDAEBpBGqyK7t0alAg==:117 a=KtsNJ/6bKgz7QsArn2OSsQ==:17 a=IkcTkHD0fZMA:10 a=A5OVakUREuEA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=gowsoOTTUOVcmtlkKump:22 a=EUspDBNiAAAA:8 a=LJiLoplfShnj9_vHJaQA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=1OuFwYUASf3TG4hYMiVC:22 X-Proofpoint-ORIG-GUID: kTeVSyEbg6dkN2WnLX8HSrw367kgwOZ2 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDEzMDA4OCBTYWx0ZWRfX4EAAWamDGSC4 Ba61E7FkxPSAwo57B+KUY+gexWjyKNSbrq0NEhD4BYcWGMPIm0RGh8NYxDiUx2kdeKyvBs0WyEY wKZFvkBA8Wy4qb1J1gEaM9pXFet5Hs5431boLceCQZUoCNaUvSs7by/DrOscKbRoB/BwBp5sZrS AxdWRjOFzmRosa/ISeZ8nhQFOt6QPM3lkL9zsZDHr5KKG4oxGUVNXNx22qv3t5O7BiSGTszkf/J uMRzGyczma7Z5pkh/2zaJqlxodWfkGXuGWwPyQuElS0ZS6bkZtGtVPhxCL796tqoTjcmtRU5MlO R7UmLn3wE+KeBBdxA21A7uNwxwCdYhPSW5JsG6I52P7+staIM3tadYBEUXhN424Lmxh7in9bDT7 7lVRkP6lEx+DXrKBtCVMnAPIUae3lfYypcoZNUCWaStyExGEleYS2UjxQCB6nGUYl8Gw9Ng2Co7 +8uvs4OBINi6ikJRL1w== 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 impostorscore=0 malwarescore=0 spamscore=0 bulkscore=0 priorityscore=1501 adultscore=0 lowpriorityscore=0 phishscore=0 clxscore=1015 suspectscore=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 2:22 AM, Jeff Hugo wrote: > On 3/19/2026 12:31 AM, Kishore Batta wrote: >> The Sahara driver currently selects firmware image tables using >> scattered, device specific conditionals in the probe path, making the >> logic harder to  follow and extend. > > "to follow" (remove extra space) ACK. > >> Refactor firmware image table selection into a single, explicit >> probe-time >> mechanism by introducing a variant table that captures device matching, >> firmware image tables, firmware folder names, and streaming behavior in >> one place. >> >> This centralizes device specific decisions, simplifies the probe logic, >> and avoids ad-hoc conditionals while preserving the existing behavior >> for >> all supported AIC devices. > > It would probably be useful to mention this is in preparation for > adding QDU100 support, otherwise this reads like it is just change for > the sake of change. Sure. I will mention in next version. > >> Signed-off-by: Kishore Batta >> --- >>   drivers/bus/mhi/sahara/sahara.c | 66 >> ++++++++++++++++++++++++++++++++++++----- >>   1 file changed, 58 insertions(+), 8 deletions(-) >> >> diff --git a/drivers/bus/mhi/sahara/sahara.c >> b/drivers/bus/mhi/sahara/sahara.c >> index >> e3499977e7c6b53bc624a8eb00d0636f2ea63307..8f1c0d72066c0cf80c09d78bfc51df2e482133b9 >> 100644 >> --- a/drivers/bus/mhi/sahara/sahara.c >> +++ b/drivers/bus/mhi/sahara/sahara.c >> @@ -180,6 +180,16 @@ struct sahara_context { >>       u32                read_data_length; >>       bool                is_mem_dump_mode; >>       bool                non_streaming; >> +    const char            *fw_folder; >> +}; >> + >> +struct sahara_variant { >> +    const char *match; >> +    bool match_is_chan; > > This is dead code, add it later on when it gets used. ACK. > >> +    const char * const *image_table; >> +    size_t table_size; >> +    const char *fw_folder; > > This is dead code, add it later on when it gets used. ACK. > >> +    bool non_streaming; > > Please run pahole on this structure. With the interleaving of types > for every other member, I'm expecting there would be quite a bit of > compiler added padding. Sure. I had ran pahole on this structure and 8 bytes can be saved. I will rearrange the members of the structure in the next version. > >