Re: [PATCH v1] phy: rockchip-snps-pcie3:phy: Configure clkreq_n and PowerDown for all lanes

[Shawn Lin <shawn.lin@rock-chips.com>]

Hi Anand

在 2026/04/09 星期四 12:49, Anand Moon 写道:
> During the rk3588_p3phy_init sequence, the driver now explicitly
> configures each lane's CON0 register to ensure
> - PIPE 4.3 Compliance: clkreq_n (bit 6) is forced low (asserted) to meet
>    sideband signal requirements.

clkreq_n is now force asserted via controller driver if supports_clkreq
is not set.

> - Active Power State: PowerDown[3:0] (bits 11:8) is set to P0
>    (Normal Operational State) to ensure the PHY is fully powered and ready
>    for link training.
> 

P0 is the nature state when linking up. I don't know why it should be P0
before we even don't know whether the device is present.

> These changes ensure that all lanes are consistently transitioned from
> reset into a known-good operational state, preventing undefined behavior
> and ensuring the PHY is ready for high-speed data transmission.
> 
> Cc: Niklas Cassel <cassel@kernel.org>
> Signed-off-by: Anand Moon <linux.amoon@gmail.com>
> ---
>   .../phy/rockchip/phy-rockchip-snps-pcie3.c    | 28 +++++++++++++++++--
>   1 file changed, 26 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/phy/rockchip/phy-rockchip-snps-pcie3.c b/drivers/phy/rockchip/phy-rockchip-snps-pcie3.c
> index 4e8ffd173096..f46e13e79a0e 100644
> --- a/drivers/phy/rockchip/phy-rockchip-snps-pcie3.c
> +++ b/drivers/phy/rockchip/phy-rockchip-snps-pcie3.c
> @@ -7,6 +7,7 @@
>   
>   #include <linux/clk.h>
>   #include <linux/delay.h>
> +#include <linux/hw_bitfield.h>
>   #include <linux/io.h>
>   #include <linux/iopoll.h>
>   #include <linux/kernel.h>
> @@ -35,10 +36,14 @@
>   #define RK3588_PCIE3PHY_GRF_CMN_CON0		0x0
>   #define RK3588_PCIE3PHY_GRF_PHY0_STATUS1	0x904
>   #define RK3588_PCIE3PHY_GRF_PHY1_STATUS1	0xa04
> +#define RK3588_PCIE3PHY_GRF_PHY0_LN0_CON0	0x1000
>   #define RK3588_PCIE3PHY_GRF_PHY0_LN0_CON1	0x1004
>   #define RK3588_PCIE3PHY_GRF_PHY0_LN1_CON1	0x1104
> +#define RK3588_PCIE3PHY_GRF_PHY0_LN1_CON0	0x1100
> +#define RK3588_PCIE3PHY_GRF_PHY1_LN0_CON0	0x2000
>   #define RK3588_PCIE3PHY_GRF_PHY1_LN0_CON1	0x2004
>   #define RK3588_PCIE3PHY_GRF_PHY1_LN1_CON1	0x2104
> +#define RK3588_PCIE3PHY_GRF_PHY1_LN1_CON0	0x2100
>   #define RK3588_SRAM_INIT_DONE(reg)		(reg & BIT(0))
>   
>   #define RK3588_BIFURCATION_LANE_0_1		BIT(0)
> @@ -49,6 +54,13 @@
>   #define RK3588_PCIE1LN_SEL_EN			(GENMASK(1, 0) << 16)
>   #define RK3588_PCIE30_PHY_MODE_EN		(GENMASK(2, 0) << 16)
>   
> +static const u32 rk3588_lane_con0[] = {
> +	RK3588_PCIE3PHY_GRF_PHY0_LN0_CON0,
> +	RK3588_PCIE3PHY_GRF_PHY0_LN1_CON0,
> +	RK3588_PCIE3PHY_GRF_PHY1_LN0_CON0,
> +	RK3588_PCIE3PHY_GRF_PHY1_LN1_CON0,
> +};
> +
>   struct rockchip_p3phy_ops;
>   
>   struct rockchip_p3phy_priv {
> @@ -142,7 +154,7 @@ static int rockchip_p3phy_rk3588_init(struct rockchip_p3phy_priv *priv)
>   {
>   	u32 reg = 0;
>   	u8 mode = RK3588_LANE_AGGREGATION; /* default */
> -	int ret;
> +	int ret, i;
>   
>   	regmap_write(priv->phy_grf, RK3588_PCIE3PHY_GRF_PHY0_LN0_CON1,
>   		     priv->rx_cmn_refclk_mode[0] ? RK3588_RX_CMN_REFCLK_MODE_EN :
> @@ -161,7 +173,7 @@ static int rockchip_p3phy_rk3588_init(struct rockchip_p3phy_priv *priv)
>   	regmap_write(priv->phy_grf, RK3588_PCIE3PHY_GRF_CMN_CON0, BIT(8) | BIT(24));
>   
>   	/* Set bifurcation if needed */
> -	for (int i = 0; i < priv->num_lanes; i++) {
> +	for (i = 0; i < priv->num_lanes; i++) {
>   		if (priv->lanes[i] > 1)
>   			mode &= ~RK3588_LANE_AGGREGATION;
>   		if (priv->lanes[i] == 3)
> @@ -174,6 +186,18 @@ static int rockchip_p3phy_rk3588_init(struct rockchip_p3phy_priv *priv)
>   	regmap_write(priv->phy_grf, RK3588_PCIE3PHY_GRF_CMN_CON0,
>   		     RK3588_PCIE30_PHY_MODE_EN | reg);
>   
> +	for (i = 0; i < priv->num_lanes && i < ARRAY_SIZE(rk3588_lane_con0); i++) {
> +		u32 base = rk3588_lane_con0[i];
> +
> +		/* clkreq_n = 0 (asserted low for PIPE 4.3) */
> +		regmap_write(priv->phy_grf, base,
> +			     FIELD_PREP_WM16(BIT(6), 0));
> +
> +		/* PowerDown = P0 (0x0, fully active) */
> +		regmap_write(priv->phy_grf, base,
> +			     FIELD_PREP_WM16(GENMASK(11, 8), 0x0));
> +	}
> +
>   	/* Set pcie1ln_sel in PHP_GRF_PCIESEL_CON */
>   	if (!IS_ERR(priv->pipe_grf)) {
>   		reg = mode & (RK3588_BIFURCATION_LANE_0_1 | RK3588_BIFURCATION_LANE_2_3);
> 
> base-commit: 7f87a5ea75f011d2c9bc8ac0167e5e2d1adb1594

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