Am Dienstag, 5. Dezember 2023, 21:28:59 CET schrieb Sam Edwards:
> The RK3588 PCIe 3.0 controller seems to have unpredictable behavior when
> no CLKREQ/PERST/WAKE pins are configured in the pinmux. In particular, it
> will sometimes (varying between specific RK3588 chips, not over time) shut
> off the DBI block, and reads to this range will instead stall
> indefinitely.
>
> When this happens, it will prevent Linux from booting altogether. The
> PCIe driver will stall the CPU core once it attempts to read the version
> information from the DBI range.
>
> Fix this boot hang by adding the correct pinctrl configuration to the
> PCIe 3.0 device node, which is the proper thing to do anyway. While
> we're at it, also add the necessary configuration to the PCIe 2.0 node,
> which may or may not fix the equivalent problem over there -- but is the
> proper thing to do anyway. :)
>
> Fixes: 2806a69f3fef6 ("arm64: dts: rockchip: Add Turing RK1 SoM support")
> Signed-off-by: Sam Edwards <CFSworks@xxxxxxxxx>
> ---
> .../arm64/boot/dts/rockchip/rk3588-turing-rk1.dtsi | 14 ++------------
> 1 file changed, 2 insertions(+), 12 deletions(-)
>
> diff --git a/arch/arm64/boot/dts/rockchip/rk3588-turing-rk1.dtsi b/arch/arm64/boot/dts/rockchip/rk3588-turing-rk1.dtsi
> index 9570b34aca2e..129f14dbd42f 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3588-turing-rk1.dtsi
> +++ b/arch/arm64/boot/dts/rockchip/rk3588-turing-rk1.dtsi
> @@ -214,7 +214,7 @@ rgmii_phy: ethernet-phy@1 {
> &pcie2x1l1 {
> linux,pci-domain = <1>;
> pinctrl-names = "default";
> - pinctrl-0 = <&pcie2_reset>;
> + pinctrl-0 = <&pcie30x1m1_pins>;
> reset-gpios = <&gpio4 RK_PA2 GPIO_ACTIVE_HIGH>;
> status = "okay";
> };
> @@ -226,7 +226,7 @@ &pcie30phy {
> &pcie3x4 {
> linux,pci-domain = <0>;
> pinctrl-names = "default";
> - pinctrl-0 = <&pcie3_reset>;
> + pinctrl-0 = <&pcie30x4m1_pins>;
also, why are you throwing out the pinctrl for the reset pin.
That seems not related to the regular pins and you could instead just do
+ pinctrl-0 = <&pcie30x4m1_pins>, <&pcie3_reset>;
Thanks
Heiko
> reset-gpios = <&gpio4 RK_PB6 GPIO_ACTIVE_HIGH>;
> vpcie3v3-supply = <&vcc3v3_pcie30>;
> status = "okay";
> @@ -245,17 +245,7 @@ hym8563_int: hym8563-int {
> };
> };
>
> - pcie2 {
> - pcie2_reset: pcie2-reset {
> - rockchip,pins = <4 RK_PA2 RK_FUNC_GPIO &pcfg_pull_none>;
> - };
> - };
> -
> pcie3 {
> - pcie3_reset: pcie3-reset {
> - rockchip,pins = <4 RK_PB6 RK_FUNC_GPIO &pcfg_pull_none>;
> - };
> -
> vcc3v3_pcie30_en: pcie3-reg {
> rockchip,pins = <2 RK_PC5 RK_FUNC_GPIO &pcfg_pull_none>;
> };
>
