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[91.98.36.253]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-439ab6ebe56sm13690902f8f.15.2026.03.01.22.17.32 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sun, 01 Mar 2026 22:17:33 -0800 (PST) Content-Type: text/plain; charset=utf-8 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3864.400.21\)) Subject: Re: [PATCH] wifi: rtw89: retry efuse physical map dump on transient failure From: Christian Hewitt In-Reply-To: Date: Mon, 2 Mar 2026 10:17:20 +0400 Cc: Bitterblue Smith , "linux-wireless@vger.kernel.org" , "linux-kernel@vger.kernel.org" Content-Transfer-Encoding: quoted-printable Message-Id: <903C7E52-033F-455E-89DC-B78C67C0C732@gmail.com> References: <20260301042422.195491-1-christianshewitt@gmail.com> To: Ping-Ke Shih X-Mailer: Apple Mail (2.3864.400.21) > On 2 Mar 2026, at 10:04=E2=80=AFam, Ping-Ke Shih = wrote: >=20 > Christian Hewitt wrote: >>> On 2 Mar 2026, at 9:47=E2=80=AFam, Ping-Ke Shih = wrote: >>>=20 >>> Christian Hewitt wrote: >>>> On Radxa Rock 5B with a RTL8852BE combo WiFi/BT card, the efuse >>>> physical map dump intermittently fails with -EBUSY during probe. >>>> The failure occurs in rtw89_dump_physical_efuse_map_ddv() where >>>> read_poll_timeout_atomic() times out waiting for the B_AX_EF_RDY >>>> bit after 1 second. >>>=20 >>> I'm checking internally how we handle this case. >>>=20 >>> [...] >>>=20 >>>>=20 >>>> For context, firmware also fails (and recovers) sometimes: >>>=20 >>> Did you mean this doesn't always happen? sometimes? >>=20 >> It=E2=80=99s another intermittent behaviour observed on this board = (and not >> related to the issue this patch targets). It occurs less frequently >> than the efuse issue and the existing retry mechanism in the driver >> ensures firmware load always succeeds. >=20 > As intermittent behaviour, it might be not worth to try DMA.=20 >=20 > Recently, we have some patches related to PCI hardware settings. = Please > use the latest driver including patch [1] to see if it can be stable. >=20 > [1] af1e82232b98 ("wifi: rtw89: pci: restore LDO setting after device = resume") The efuse fail snippet that I posted alongside the patch was from a Linux 7.0-rc1 kernel so that patch was already present. >> We has seen similar log because of 36-bit DMA. Try below to force 32- = or 36- >>> bit DMA to see if it can resolve problem in your platform. >>=20 >> I can experiment but this doesn=E2=80=99t happen often so I probably = can=E2=80=99t >> provide meaningful feedback.