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[103.229.16.4]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-c9e921d28d9sm2139230a12.24.2026.07.03.00.03.09 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 03 Jul 2026 00:03:11 -0700 (PDT) Message-ID: Date: Fri, 3 Jul 2026 15:03:08 +0800 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 1/2] wifi: ath11k: Flush the posted write after writing to PCIE_SOC_GLOBAL_RESET To: Manivannan Sadhasivam , jjohnson@kernel.org Cc: linux-wireless@vger.kernel.org, ath12k@lists.infradead.org, ath11k@lists.infradead.org, linux-kernel@vger.kernel.org, mani@kernel.org, Alex Williamson References: <20260623141649.41087-1-manivannan.sadhasivam@oss.qualcomm.com> From: Baochen Qiang Content-Language: en-US In-Reply-To: <20260623141649.41087-1-manivannan.sadhasivam@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzAzMDA2NSBTYWx0ZWRfX0LyC75X9gAfQ 77XsZOn3aQoCEL+WdRGfHXh7+Py5KvGe15S+JTZZMTQbC34WCBoQ3W6LzFKXDCQS3EREjvgb6MO XWHLghWZ1fSNjnJIZl0uaWP7fmH6jSnFJD4cixoH8Sj4ZPGA29rPUaEhAQkbkKon0U6ajVsEx58 R1MKW6PQyve7ufJhGYYHBRnsQqfgTnh6G11LwQsOvWEFLCeY3/3QulMpVEQw/Zb11rP3nbxOPpC 2K0IG2GYvePa6AaC2qnPOm+gSrglHZe7TQkTqJlOIrpUcJRzDaQtuIj/xcE5psMsGs3GJLXLgEG 38XY0xLXv6L0yr0P/mzJF8mqFzlD4z2vfYKmQ/7VFm1quLfPIlOBDs9A6zFqQCtIKoBhDpGelJE p+L1F5Ojd4R6NLhz8xAeRtS7k6wCCrZJjhpK9BpNW438JD+EykAdC2oX+QTkVb2GZ1pPbdYyYtf pfUMhSd4RNoiu+SlG2Q== X-Proofpoint-ORIG-GUID: 42zoPTLrDjRNVnUy_Zaz4sEM4TSicTbi X-Authority-Analysis: v=2.4 cv=cc3iaHDM c=1 sm=1 tr=0 ts=6a475eb1 cx=c_pps a=Qgeoaf8Lrialg5Z894R3/Q==:117 a=nuhDOHQX5FNHPW3J6Bj6AA==:17 a=IkcTkHD0fZMA:10 a=RAioF0-LDSMA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=_K5XuSEh1TEqbUxoQ0s3:22 a=VwQbUJbxAAAA:8 a=r1p2_3pzAAAA:8 a=EUspDBNiAAAA:8 a=fjTVS2QutaehiSyZ5pEA:9 a=QEXdDO2ut3YA:10 a=x9snwWr2DeNwDh03kgHS:22 a=r_pkcD-q9-ctt7trBg_g:22 X-Proofpoint-Spam-Info: AW1haW4tMjYwNzAzMDA2NSBTYWx0ZWRfX/WyqCZtsv4Fw ixcXs5My49HtBI5TbqsTBnapoEafrxJuj2d2isP//UjESnXHM2MwvdFwnysmNm/9YNA1ka4Z9zJ TmYt0y1p4rRjYGN6SNGy0bC0hwjs3YE= X-Proofpoint-GUID: 42zoPTLrDjRNVnUy_Zaz4sEM4TSicTbi X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.125,FMLib:17.12.100.49 definitions=2026-07-03_02,2026-06-26_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 suspectscore=0 adultscore=0 bulkscore=0 priorityscore=1501 phishscore=0 spamscore=0 impostorscore=0 malwarescore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607030065 On 6/23/2026 10:16 PM, Manivannan Sadhasivam wrote: > ath11k_pci_soc_global_reset() tries to reset the device by writing to the > PCIE_SOC_GLOBAL_RESET register. But it doesn't do a read-back to ensure > that the write gets flushed to the device before the delay. > > This may lead to the delay on the host to be insufficient, if the posted > write doesn't reach the device before the delay. > > So add a read-back after writing to the PCIE_SOC_GLOBAL_RESET register and > before the delay. > > Compile tested only. > > Fixes: f3c603d412b3 ("ath11k: reset MHI during power down and power up") > Reported-by: Alex Williamson > Closes: https://lore.kernel.org/linux-pci/20260622160822.09350246@shazbot.org > Signed-off-by: Manivannan Sadhasivam Reviewed-by: Baochen Qiang