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Message-ID: <ce7022e6-011c-4745-a508-4776269708d0@linaro.org>
Date: Fri, 29 Dec 2023 14:08:25 +0100
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Subject: Re: [PATCH 1/3] arm64: dts: qcom: sc8280xp: Fix PCIe PHY
 power-domains
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To: Johan Hovold <johan@kernel.org>
Cc: Bjorn Andersson <andersson@kernel.org>, Rob Herring <robh+dt@kernel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
 Conor Dooley <conor+dt@kernel.org>, Johan Hovold <johan+linaro@kernel.org>,
 Marijn Suijten <marijn.suijten@somainline.org>,
 linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org,
 linux-kernel@vger.kernel.org,
 Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>,
 Konrad Dybcio <konrad.dybcio@somainline.org>
References: <20231227-topic-8280_pcie_dts-v1-0-13d12b1698ff@linaro.org>
 <20231227-topic-8280_pcie_dts-v1-1-13d12b1698ff@linaro.org>
 <ZY6sh8nlEUyEfL0u@hovoldconsulting.com>
From: Konrad Dybcio <konrad.dybcio@linaro.org>
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In-Reply-To: <ZY6sh8nlEUyEfL0u@hovoldconsulting.com>
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On 29.12.2023 12:24, Johan Hovold wrote:
> On Wed, Dec 27, 2023 at 11:28:26PM +0100, Konrad Dybcio wrote:
>> The PCIe GDSCs are only related to the RCs. The PCIe PHYs on the other
>> hand, are powered by VDD_MX and their specific VDDA_PHY/PLL regulators.
> 
> No, that does not seem to be entirely correct. I added the power-domains
> here precisely because they were needed to enable the PHYs.
> 
> This is something I stumbled over when trying to figure out how to
> add support for the second lane pair (i.e. four-lane mode), and I just
> went back and confirmed that this is still the case.
> 
> If you try to enable one of these PHYs without the corresponding GDSC
> being enabled, you end up with:
> 
> [   37.709324] ------------[ cut here ]------------
> [   37.718196] gcc_pcie_3b_aux_clk status stuck at 'off'
> [   37.718205] WARNING: CPU: 4 PID: 482 at drivers/clk/qcom/clk-branch.c:86 clk_branch_wait+0x144/0x15c
> 	
> Now, you may or may not want to describe the above in the devicetree,
> but this makes it sound like you're trying to work around an issue with
> the current Linux implementation.
Could you please recheck this with patch 1 from [1] applied?

Konrad

[1] https://lore.kernel.org/linux-arm-msm/20231227-topic-8280_pcie-v1-1-095491baf9e4@linaro.org/T/#u