Re: [PATCH v1 0/1] phy: freescale: imx8m-pcie: facing pcie link-up instability

Vinod Koul
2024-04-06T09:18:40Z

On Fri, 22 Mar 2024 14:06:31 +0100, Marcel Ziswiler wrote:
> In our automated testing setup, we use Delock Mini-PCIe SATA cards [1].
> While this setup has proven very stable overall we noticed upstream on
> the i.MX8M Mini fails quite regularly (about 50/50) to bring up the PCIe
> link while with NXP's downstream BSP 5.15.71_2.2.2 it always works. As
> that old downstream stuff was quite different, I first also tried NXP's
> latest downstream BSP 6.1.55_2.2.0 which from a PCIe point of view is
> fairly vanilla, however, also there the PCIe link-up was not stable.
> Comparing and debugging I noticed that upstream explicitly configures
> the AUX_PLL_REFCLK_SEL to I_PLL_REFCLK_FROM_SYSPLL while working
> downstream [2] leaving it at reset defaults of AUX_IN (PLL clock).
> Unfortunately, the TRM does not mention any further details about this
> register (both for the i.MX 8M Mini as well as the Plus). Maybe somebody
> from NXP could further comment on this?
>
> [...]

Applied, thanks!

[1/1] phy: freescale: imx8m-pcie: fix pcie link-up instability
commit: 3a161017f1de55cc48be81f6156004c151f32677

Best regards,
--
~Vinod