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arm64: dts: qcom: sc8280xp-x13s: limit pcie4 link speed 

commit 7a1c6a8bf47b0b290c79b9cc3ba6ee68be5522e8 upstream.

Limit the WiFi PCIe link speed to Gen2 speed (500 MB/s), which is the
speed that the boot firmware has brought up the link at (and that
Windows uses).

This is specifically needed to avoid a large amount of link errors when
restarting the link during boot (but which are currently not reported).

This also appears to fix intermittent failures to download the ath11k
firmware during boot which can be seen when there is a longer delay
between restarting the link and loading the WiFi driver (e.g. when using
full disk encryption).

Fixes: 123b30a756 ("arm64: dts: qcom: sc8280xp-x13s: enable WiFi controller")
Cc: stable@vger.kernel.org      # 6.2
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20240223152124.20042-8-johan+linaro@kernel.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2024-02-23 16:21:19 +01:00 committed by Greg Kroah-Hartman
parent 27cd25e3b3
commit d97be07a00
1 changed files with 2 additions and 0 deletions
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2
arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts
View File

@ -721,6 +721,8 @@
};
&pcie4 {
max-link-speed = <2>;
perst-gpios = <&tlmm 141 GPIO_ACTIVE_LOW>;
wake-gpios = <&tlmm 139 GPIO_ACTIVE_LOW>;