Re: [PATCH v2] phy: airoha: adjust initialization delay in airoha_pcie_phy_init()

[AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>]

Il 05/08/24 21:57, Lorenzo Bianconi ha scritto:
> Align phy-pcie initialization delay to the vendor sdk in
> airoha_pcie_phy_init routine and allow the hw to complete required
> configuration before proceeding
> 
> Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>

> ---
> Changes since v1:
> - use msleep() instead of mdelay()
> ---
>   drivers/phy/phy-airoha-pcie.c | 10 ++++++++--
>   1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/phy/phy-airoha-pcie.c b/drivers/phy/phy-airoha-pcie.c
> index bd3edaa986c8..6d61e6486a03 100644
> --- a/drivers/phy/phy-airoha-pcie.c
> +++ b/drivers/phy/phy-airoha-pcie.c
> @@ -18,6 +18,9 @@
>   #define LEQ_LEN_CTRL_MAX_VAL	7
>   #define FREQ_LOCK_MAX_ATTEMPT	10
>   
> +/* PCIe-PHY initialization time in ms needed by the hw to complete */
> +#define PHY_HW_INIT_TIME_MS	30
> +
>   enum airoha_pcie_port_gen {
>   	PCIE_PORT_GEN1 = 1,
>   	PCIE_PORT_GEN2,
> @@ -1180,8 +1183,11 @@ static int airoha_pcie_phy_init(struct phy *phy)
>   				 PCIE_DA_XPON_CDR_PR_PWDB);
>   	airoha_phy_pma1_set_bits(pcie_phy, REG_PCIE_PMA_SS_DA_XPON_PWDB0,
>   				 PCIE_DA_XPON_CDR_PR_PWDB);
> -
> -	usleep_range(100, 200);
> +	/*
> +	 * Wait for the time in ms needed by the hw to complete the PCIe-PHY
> +	 * initialization

...but regardless, I have a nit here (not a blocker for me, hence the R-b tag):
there's no need to say that we're waiting for milliseconds, so this comment can
be just one line:

	/* Wait for the PCIe PHY to complete initialization before returning */

Cheers,
Angelo

> +	 */
> +	msleep(PHY_HW_INIT_TIME_MS);
>   
>   	return 0;
>   }



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