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Tue, 8 Sep 2026 14:01:33 -0500 Received: from lelvem-mr05.itg.ti.com (10.180.75.9) by DLEE206.ent.ti.com (157.170.170.90) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.45 via Frontend Transport; Tue, 8 Sep 2026 14:01:33 -0500 Received: from [128.247.81.65] (uda0499903.dhcp.ti.com [128.247.81.65]) by lelvem-mr05.itg.ti.com (8.18.1/8.18.1) with ESMTP id 688J1Xvi4006524; Tue, 8 Sep 2026 14:01:33 -0500 Message-ID: <27180a0b-fd1e-4304-8aed-8f2dccef2d63@ti.com> Date: Tue, 8 Sep 2026 14:01:33 -0500 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/1] arm64: dts: ti: k3-j784s4-j742s2-evm-common: Set ACSPCIe refclk to MAIN_PLL2_HSDIV4 for pcie1 To: Siddharth Vadapalli CC: Conor Dooley , Krzysztof Kozlowski , Rob Herring , Tero Kristo , Vignesh Raghavendra , Nishanth Menon , , , References: <20260828195140.3476062-1-j-mcarthur@ti.com> <9ad18c6d-979c-49ad-a96b-c835ea2188f3@ti.com> Content-Language: en-US From: Jared McArthur In-Reply-To: <9ad18c6d-979c-49ad-a96b-c835ea2188f3@ti.com> Content-Type: text/plain; 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The ACSPCIe reference clock is muxable between multiple >> sources: SERDESx_REF_DER_OUT_CLK, MAIN_PLL2_HSDIV4_CLKOUT, and >> SERDESx_REF_OUT_CLK [0]. On reset, the refclk is set to the >> SERDESx_REF_DER_OUT_CLK. In the J742S2 and J784S4, "the SerDes PCIe >> Reference Clock Output will be temporarily disabled when changing Data >> Rates to or from 8.0 GT/s in Derived Refclk mode". Some external PCIe >> devices cannot tolerate the reference clock being disabled and will >> therefore fail to link. >> >> This advisory is described in more detail as: i2242 of the J784S4 >> Silicon Revision 1.0 (Rev. B) document [1]. >> >> The refclk for devices connected to PCIe1 is provided by the ACSPCIe >> buffers in the J742S2XH01EVM [2] and J784S4XEVM [3]. Work around >> the advisory by setting the ACSPCIe reference clock source to >> MAIN_PLL2_HSDIV4_CLKOUT. Use the TI SCI clock controller to assign the >> clock's source [4]. >> >> [0] https://www.ti.com/lit/zip/spruj52 >> [1] https://www.ti.com/lit/er/sprz536b/sprz536b.pdf >> [2] https://www.ti.com/lit/zip/SPAC001 >> [3] https://www.ti.com/lit/zip/SPRR458 >> [4] https://software-dl.ti.com/tisci/esd/latest/5_soc_doc/j784s4/clocks.html >> >> Signed-off-by: Jared McArthur > > Since this seems to be a 'Fix', adding a 'Fixes tag' and copying 'stable@vger.kernel.org' will get the fix backported to all LTS kernels. > > Rest of the patch however looks good to me. > > Reviewed-by: Siddharth Vadapalli > > Regards, > Siddharth. > Thank you for the comments. I have added a "Fixes" tag and your "reviewed-by" and sent a v2 with "stable@vger.kernel.org" cc'd. >> --- >>   arch/arm64/boot/dts/ti/k3-j784s4-j742s2-evm-common.dtsi | 2 ++ >>   1 file changed, 2 insertions(+) >> >> diff --git a/arch/arm64/boot/dts/ti/k3-j784s4-j742s2-evm-common.dtsi b/arch/arm64/boot/dts/ti/k3-j784s4-j742s2-evm-common.dtsi >> index ff3a85cbc524a..7c085663c8880 100644 >> --- a/arch/arm64/boot/dts/ti/k3-j784s4-j742s2-evm-common.dtsi >> +++ b/arch/arm64/boot/dts/ti/k3-j784s4-j742s2-evm-common.dtsi >> @@ -1206,6 +1206,8 @@ &pcie1_rc { >>       status = "okay"; >>       clocks = <&k3_clks 333 0>, <&serdes0 CDNS_TORRENT_REFCLK_DRIVER>; >>       clock-names = "fck", "pcie_refclk"; >> +    assigned-clocks = <&k3_clks 415 0>; >> +    assigned-clock-parents = <&k3_clks 415 2>; >>       num-lanes = <2>; >>       reset-gpios = <&exp1 2 GPIO_ACTIVE_HIGH>; >>       phys = <&serdes0_pcie1_link>; > -- Best, Jared McArthur