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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. > --- > 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>;