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Tue, 17 Dec 2024 05:07:17 -0800 (PST) From: Bartosz Golaszewski To: Manivannan Sadhasivam , Stephan Gerhold Cc: linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, Bartosz Golaszewski Subject: [PATCH] power: sequencing: qcom-wcn: explain why we need the WLAN_EN GPIO hack Date: Tue, 17 Dec 2024 14:07:14 +0100 Message-ID: <20241217130714.51406-1-brgl@bgdev.pl> X-Mailer: git-send-email 2.45.2 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Bartosz Golaszewski With the recent rework of the PCI power control code, the workaround for the wlan-enable GPIO - where we don't set a default (low) state in the power sequencing driver, but instead request the pin as-is - should no longer be needed but some platforms still fail to probe the WLAN controller. This is caused by the Qcom PCIe controller and needs a workaround in the controller driver so add a FIXME to eventually remove the hack from this driver once this is done. Signed-off-by: Bartosz Golaszewski --- drivers/power/sequencing/pwrseq-qcom-wcn.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/power/sequencing/pwrseq-qcom-wcn.c b/drivers/power/seq= uencing/pwrseq-qcom-wcn.c index cc03b5aaa8f2..9d6a68ac719f 100644 --- a/drivers/power/sequencing/pwrseq-qcom-wcn.c +++ b/drivers/power/sequencing/pwrseq-qcom-wcn.c @@ -396,6 +396,14 @@ static int pwrseq_qcom_wcn_probe(struct platform_devic= e *pdev) return dev_err_probe(dev, PTR_ERR(ctx->bt_gpio), "Failed to get the Bluetooth enable GPIO\n"); =20 + /* + * FIXME: This should actually be GPIOD_OUT_LOW. The driver model can + * correctly handle provider <-> consumer dependencies but there is a + * known issue with Qcom PCIe controllers where, if the device is + * powered off abrubtly (without controller driver noticing), the PCIe + * link moves to link down state. Until the link-down handling is + * addressed in the controller driver, we need to keep this workaround. + */ ctx->wlan_gpio =3D devm_gpiod_get_optional(dev, "wlan-enable", GPIOD_ASIS); if (IS_ERR(ctx->wlan_gpio)) --=20 2.45.2