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[103.229.16.4]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-74eb9f25269sm15886150b3a.107.2025.07.17.03.46.14 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 17 Jul 2025 03:46:18 -0700 (PDT) Message-ID: <03806d02-1cfc-4db2-8b63-c1e51f5456e2@oss.qualcomm.com> Date: Thu, 17 Jul 2025 18:46:12 +0800 Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 4/6] wifi: ath12k: Use pci_{enable/disable}_link_state() APIs to enable/disable ASPM states To: Manivannan Sadhasivam Cc: manivannan.sadhasivam@oss.qualcomm.com, Jeff Johnson , Lorenzo Pieralisi , =?UTF-8?Q?Krzysztof_Wilczy=C5=84ski?= , Rob Herring , Bjorn Helgaas , Nirmal Patel , Jonathan Derrick , linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org, ath12k@lists.infradead.org, ath11k@lists.infradead.org, ath10k@lists.infradead.org, Bjorn Helgaas , ilpo.jarvinen@linux.intel.com, linux-arm-msm@vger.kernel.org, linux-pci@vger.kernel.org, Krishna Chaitanya Chundru , Qiang Yu References: <20250716-ath-aspm-fix-v1-0-dd3e62c1b692@oss.qualcomm.com> <20250716-ath-aspm-fix-v1-4-dd3e62c1b692@oss.qualcomm.com> <38ace6a3-d594-4438-a193-cf730a7b87d6@oss.qualcomm.com> Content-Language: en-US From: Baochen Qiang In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=dKimmPZb c=1 sm=1 tr=0 ts=6878d47c cx=c_pps a=WW5sKcV1LcKqjgzy2JUPuA==:117 a=nuhDOHQX5FNHPW3J6Bj6AA==:17 a=IkcTkHD0fZMA:10 a=Wb1JkmetP80A:10 a=oqDAYNfCzTduPHUzJrAA:9 a=QEXdDO2ut3YA:10 a=OpyuDcXvxspvyRM73sMx:22 X-Proofpoint-GUID: xjBUgk7JeXriVDxjNbTr8Uv2jTdW3kWK X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNzE3MDA5NCBTYWx0ZWRfX14/tYZf1xEJI q1s0liUUExlZOGaAjChtYm+HinPQ7G+64Fj8+nTH+33zZ9nyPtTAr6U2KCG5CZN9fxQQ4Yub+hH cDfH7THWJalk/brQUjy3SfPIaoup4qhooHDV8EVgm05TeZf4dYEoO0Kg6KCOvPaMRJerrORu6L+ YTZUcvYGioGRyTcoU6qGz3e75nZSto05WLA3C/tg6Pt5fFXDWoLLEUdBV4boaivdGoh8Gw8iPbU 4Q3UCHZ3UDfML/W+Hd/6tPMzHCwaDHRTPBwxk3zsI2KyuukPD1In0uvMGfev0iXy/L/8t5jT3wl dNOfQJOLRgbrg4/YGkMxQsahHTzkYGCZzqF3iPNEDoDCnVGTFsRMHsRh9NFtdDblb7OCRfmUrJe ppRVyh29idYRLeWaS8/2FbzZlrO83Jg96p1/L45fwV0hszlahGcGQAuQpca5dthLFFtE4s93 X-Proofpoint-ORIG-GUID: xjBUgk7JeXriVDxjNbTr8Uv2jTdW3kWK X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-07-17_01,2025-07-16_02,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 clxscore=1015 mlxlogscore=999 mlxscore=0 spamscore=0 adultscore=0 impostorscore=0 priorityscore=1501 suspectscore=0 bulkscore=0 phishscore=0 lowpriorityscore=0 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2505280000 definitions=main-2507170094 On 7/17/2025 6:31 PM, Manivannan Sadhasivam wrote: > On Thu, Jul 17, 2025 at 05:24:13PM GMT, Baochen Qiang wrote: > > [...] > >>> @@ -16,6 +16,8 @@ >>> #include "mhi.h" >>> #include "debug.h" >>> >>> +#include "../ath.h" >>> + >>> #define ATH12K_PCI_BAR_NUM 0 >>> #define ATH12K_PCI_DMA_MASK 36 >>> >>> @@ -928,8 +930,7 @@ static void ath12k_pci_aspm_disable(struct ath12k_pci *ab_pci) >>> u16_get_bits(ab_pci->link_ctl, PCI_EXP_LNKCTL_ASPM_L1)); >>> >>> /* disable L0s and L1 */ >>> - pcie_capability_clear_word(ab_pci->pdev, PCI_EXP_LNKCTL, >>> - PCI_EXP_LNKCTL_ASPMC); >>> + pci_disable_link_state(ab_pci->pdev, PCIE_LINK_STATE_L0S | PCIE_LINK_STATE_L1); >> >> Not always, but sometimes seems the 'disable' does not work: >> >> [ 279.920507] ath12k_pci_power_up 1475: link_ctl 0x43 //before disable >> [ 279.920539] ath12k_pci_power_up 1482: link_ctl 0x43 //after disable >> >> >>> >>> set_bit(ATH12K_PCI_ASPM_RESTORE, &ab_pci->flags); >>> } >>> @@ -958,10 +959,7 @@ static void ath12k_pci_aspm_restore(struct ath12k_pci *ab_pci) >>> { >>> if (ab_pci->ab->hw_params->supports_aspm && >>> test_and_clear_bit(ATH12K_PCI_ASPM_RESTORE, &ab_pci->flags)) >>> - pcie_capability_clear_and_set_word(ab_pci->pdev, PCI_EXP_LNKCTL, >>> - PCI_EXP_LNKCTL_ASPMC, >>> - ab_pci->link_ctl & >>> - PCI_EXP_LNKCTL_ASPMC); >>> + pci_enable_link_state(ab_pci->pdev, ath_pci_aspm_state(ab_pci->link_ctl)); >> >> always, the 'enable' is not working: >> >> [ 280.561762] ath12k_pci_start 1180: link_ctl 0x43 //before restore >> [ 280.561809] ath12k_pci_start 1185: link_ctl 0x42 //after restore >> > > Interesting! I applied your diff and I never see this issue so far (across 10+ > reboots): I was not testing reboot. Here is what I am doing: step1: rmmod ath12k step2: force LinkCtrl using setpci (make sure it is 0x43, which seems more likely to see the issue) sudo setpci -s 02:00.0 0x80.B=0x43 step3: insmod ath12k and check linkctrl > > [ 3.758239] ath12k_pci_power_up 1475: link_ctl 0x42 > [ 3.758315] ath12k_pci_power_up 1480: link_ctl 0x40 > [ 4.383900] ath12k_pci_start 1180: link_ctl 0x40 > [ 4.384026] ath12k_pci_start 1185: link_ctl 0x42 > > Are you sure that you applied all the 6 patches in the series and not just the > ath patches? Because, the first 3 PCI core patches are required to make the API > work as intended. pretty sure all of them: $ git log --oneline 07387d1bc17f (HEAD -> VALIDATE-pci-enable-link-state-behavior) wifi: ath12k: dump linkctrl reg dbb3e5a7828b wifi: ath10k: Use pci_{enable/disable}_link_state() APIs to enable/disable ASPM states 392d7b3486b3 wifi: ath11k: Use pci_{enable/disable}_link_state() APIs to enable/disable ASPM states f2b0685c456d wifi: ath12k: Use pci_{enable/disable}_link_state() APIs to enable/disable ASPM states b1c8fad998f1 PCI/ASPM: Improve the kernel-doc for pci_disable_link_state*() APIs b8f5204ba4b0 PCI/ASPM: Transition the device to D0 (if required) inside pci_enable_link_state_locked() API 186b1bbd4c62 PCI/ASPM: Fix the behavior of pci_enable_link_state*() APIs 5a1ad8faaa16 (tag: ath-202507151704, origin/master, origin/main, origin/HEAD) Add localversion-wireless-testing-ath > >> >>> } >>> >>> static void ath12k_pci_cancel_workqueue(struct ath12k_base *ab) >>> >> >> In addition, frequently I can see below AER warnings: >> >> [ 280.383143] aer_ratelimit: 30 callbacks suppressed >> [ 280.383151] pcieport 0000:00:1c.0: AER: Correctable error message received from >> 0000:00:1c.0 >> [ 280.383177] pcieport 0000:00:1c.0: PCIe Bus Error: severity=Correctable, type=Data Link >> Layer, (Transmitter ID) >> [ 280.383184] pcieport 0000:00:1c.0: device [8086:7ab8] error status/mask=00001000/00002000 >> [ 280.383193] pcieport 0000:00:1c.0: [12] Timeout >> > > I don't see any AER errors either. My WLAN chip is attached via a PCIe-to-M.2 adapter, maybe some hardware issue? However I never saw them until your changes applied. > > - Mani >