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Tue, 30 Jun 2026 02:54:55 -0700 (PDT) X-Received: by 2002:a05:6a00:c87:b0:847:70aa:9586 with SMTP id d2e1a72fcca58-8479f0fb4f7mr2380832b3a.16.1782813295136; Tue, 30 Jun 2026 02:54:55 -0700 (PDT) Received: from [10.152.196.198] ([202.46.23.19]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-847a033b21esm1545220b3a.48.2026.06.30.02.54.52 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 30 Jun 2026 02:54:54 -0700 (PDT) Message-ID: Date: Tue, 30 Jun 2026 15:24:50 +0530 Precedence: bulk X-Mailing-List: linux-wireless@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/2] wifi: ath12k: 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> <20260623141649.41087-2-manivannan.sadhasivam@oss.qualcomm.com> Content-Language: en-US From: Raj Kumar Bhagat In-Reply-To: <20260623141649.41087-2-manivannan.sadhasivam@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Proofpoint-ORIG-GUID: 7vzpB9aUPjraoiCbigq6bL4HSu-DxGPa X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNjMwMDA4OSBTYWx0ZWRfXysQ7/V/5rGJL kRH3RcXpMIPPDNj4DyV6u+BOj8h6nEGHbey0Je2Nm4rTZ2lrlWX3Q2Mokgnkd4/g4lnpGjEgWgl TbM6ZmN8OMUplaYt5Jy6dkQrrVrxrQJhIXllIg7qZ3FVjnCQC+L1ejcMVmsunAYnCbIfCSt0PnX JtoDMUuprMdVDHfLm4Pfcqt6aoAX9TGrHVkHDd5RG+1HLvnEDKEb1mr1u6b7XRImuSc1pV6O9jK IR3nIrFWCB++5WxLN9zchmIlZiuZ5xuZCTqrb+mXwxI0dqv+M5k8z4p1D8QRUNpPuyr9ti5tm/L cxeDLUA470UpOjI71glwbkpBAwz9E1oZllics6eKwUHLhacwwpJ+tQnisSCv2pfZ1rKlDsjAVvX 5RjsvUFU3FWCJDLI9TDDNIQBYMWiKwvjNUqUyHAVLVDV7Y10zRDQUfIfmJXLo18SKcN+bA/A/30 t4EnxS4b0FLZCW7NhzQ== X-Proofpoint-GUID: 7vzpB9aUPjraoiCbigq6bL4HSu-DxGPa X-Proofpoint-Spam-Info: AW1haW4tMjYwNjMwMDA4OSBTYWx0ZWRfXxsgIwVhmnB61 tpszI1yX6Ydpf3fbZoCe3uDRGzY+6Vcqujq/pStZpbVZ+uf71tu+x0q94e9mQ7QrwWGmQfdBaaK sQ3NCTp0CdVOMFLgZF9P82vvVlhcQm8= X-Authority-Analysis: v=2.4 cv=SINykuvH c=1 sm=1 tr=0 ts=6a439270 cx=c_pps a=mDZGXZTwRPZaeRUbqKGCBw==:117 a=j4ogTh8yFefVWWEFDRgCtg==:17 a=IkcTkHD0fZMA:10 a=FelO9ux0wxsA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=DJpcGTmdVt4CTyJn9g5Z:22 a=VwQbUJbxAAAA:8 a=r1p2_3pzAAAA:8 a=EUspDBNiAAAA:8 a=fjTVS2QutaehiSyZ5pEA:9 a=QEXdDO2ut3YA:10 a=zc0IvFSfCIW2DFIPzwfm:22 a=r_pkcD-q9-ctt7trBg_g:22 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=2026-06-30_03,2026-06-26_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 malwarescore=0 priorityscore=1501 spamscore=0 phishscore=0 clxscore=1015 bulkscore=0 lowpriorityscore=0 adultscore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2606300089 On 23-06-2026 19:46, Manivannan Sadhasivam wrote: > ath12k_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: d889913205cf ("wifi: ath12k: driver for Qualcomm Wi-Fi 7 devices") > Reported-by: Alex Williamson > Closes:https://lore.kernel.org/linux-pci/20260622160822.09350246@shazbot.org > Signed-off-by: Manivannan Sadhasivam > --- > drivers/net/wireless/ath/ath12k/pci.c | 4 ++++ > 1 file changed, 4 insertions(+) Reviewed-by: Raj Kumar Bhagat