Re: [PATCH v2 2/2] phy: rockchip: naneng-combphy: Fix PCIe L1ss support RK3562

[Neil Armstrong <neil.armstrong@linaro.org>]

On 11/18/25 10:52, Shawn Lin wrote:
> When PCIe link enters L1 PM substates, the PHY will turn off its
> PLL for power-saving. However, it turns off the PLL too fast which
> leads the PHY to be broken. According to the PHY document, we need
> to delay PLL turnoff time.
> 
> Fixes: f13bff25161b ("phy: rockchip-naneng-combo: Support rk3562")
> Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
> ---
> 
> Changes in v2:
> - add more commit message
> 
>   drivers/phy/rockchip/phy-rockchip-naneng-combphy.c | 8 ++++++++
>   1 file changed, 8 insertions(+)
> 
> diff --git a/drivers/phy/rockchip/phy-rockchip-naneng-combphy.c b/drivers/phy/rockchip/phy-rockchip-naneng-combphy.c
> index e303bec..7f8fc8e 100644
> --- a/drivers/phy/rockchip/phy-rockchip-naneng-combphy.c
> +++ b/drivers/phy/rockchip/phy-rockchip-naneng-combphy.c
> @@ -106,6 +106,10 @@
>   #define RK3568_PHYREG18				0x44
>   #define RK3568_PHYREG18_PLL_LOOP		0x32
>   
> +#define RK3568_PHYREG30				0x74
> +#define RK3568_PHYREG30_GATE_TX_PCK_SEL         BIT(7)
> +#define RK3568_PHYREG30_GATE_TX_PCK_DLY_PLL_OFF BIT(7)
> +
>   #define RK3568_PHYREG32				0x7C
>   #define RK3568_PHYREG32_SSC_MASK		GENMASK(7, 4)
>   #define RK3568_PHYREG32_SSC_DIR_MASK		GENMASK(5, 4)
> @@ -664,6 +668,10 @@ static int rk3562_combphy_cfg(struct rockchip_combphy_priv *priv)
>   	case REF_CLOCK_100MHz:
>   		rockchip_combphy_param_write(priv->phy_grf, &cfg->pipe_clk_100m, true);
>   		if (priv->type == PHY_TYPE_PCIE) {
> +			/* Gate_tx_pck_sel length select for L1ss support */
> +			rockchip_combphy_updatel(priv, RK3568_PHYREG30_GATE_TX_PCK_SEL,
> +						 RK3568_PHYREG30_GATE_TX_PCK_DLY_PLL_OFF,
> +						 RK3568_PHYREG30);
>   			/* PLL KVCO tuning fine */
>   			val = FIELD_PREP(RK3568_PHYREG33_PLL_KVCO_MASK,
>   					 RK3568_PHYREG33_PLL_KVCO_VALUE);

Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>

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