linux-kernel - Re: [PATCH 14/14] phy: cadence-torrent: Check PIPE mode PHY status to be ready for operation

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Date:   Thu, 13 May 2021 13:25:49 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Swapnil Jakhade <sjakhade@...ence.com>, <vkoul@...nel.org>,
        <p.zabel@...gutronix.de>, <linux-phy@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
CC:     <mparab@...ence.com>, <lokeshvutla@...com>
Subject: Re: [PATCH 14/14] phy: cadence-torrent: Check PIPE mode PHY status to
 be ready for operation

Hi Swapnil,

On 09/04/21 11:04 am, Swapnil Jakhade wrote:
> PIPE PHY status is used to communicate the completion of several PHY
> functions. Check if PHY is ready for operation while configured for
> PIPE mode during startup.
> 
> Signed-off-by: Swapnil Jakhade <sjakhade@...ence.com>
> ---
>  drivers/phy/cadence/phy-cadence-torrent.c | 60 +++++++++++++++++++++++
>  1 file changed, 60 insertions(+)
> 
> diff --git a/drivers/phy/cadence/phy-cadence-torrent.c b/drivers/phy/cadence/phy-cadence-torrent.c
> index 39145e56e061..42a1bdfd18d5 100644
> --- a/drivers/phy/cadence/phy-cadence-torrent.c
> +++ b/drivers/phy/cadence/phy-cadence-torrent.c
> @@ -51,6 +51,10 @@
>  #define TORRENT_PHY_PCS_COMMON_OFFSET(block_offset)	\
>  				(0xC000 << (block_offset))
>  
> +#define TORRENT_PHY_PCS_LANE_CDB_OFFSET(ln, block_offset, reg_offset)	\
> +				((0xD000 << (block_offset)) +		\
> +				(((ln) << 9) << (reg_offset)))
> +
>  #define TORRENT_PHY_PMA_COMMON_OFFSET(block_offset)	\
>  				(0xE000 << (block_offset))
>  
> @@ -218,6 +222,9 @@
>  #define PHY_PIPE_USB3_GEN2_POST_CFG0	0x0022U
>  #define PHY_PIPE_USB3_GEN2_POST_CFG1	0x0023U
>  
> +/* PHY PCS lane registers */
> +#define PHY_PCS_ISO_LINK_CTRL		0x000BU
> +
>  /* PHY PMA common registers */
>  #define PHY_PMA_CMN_CTRL1		0x0000U
>  #define PHY_PMA_CMN_CTRL2		0x0001U
> @@ -242,6 +249,9 @@ static const struct reg_field phy_pma_pll_raw_ctrl =
>  static const struct reg_field phy_reset_ctrl =
>  				REG_FIELD(PHY_RESET, 8, 8);
>  
> +static const struct reg_field phy_pcs_iso_link_ctrl_1 =
> +				REG_FIELD(PHY_PCS_ISO_LINK_CTRL, 1, 1);
> +
>  static const struct reg_field phy_pipe_cmn_ctrl1_0 = REG_FIELD(PHY_PIPE_CMN_CTRL1, 0, 0);
>  
>  #define REFCLK_OUT_NUM_CMN_CONFIG	5
> @@ -316,12 +326,14 @@ struct cdns_torrent_phy {
>  	struct regmap *regmap_phy_pma_common_cdb;
>  	struct regmap *regmap_tx_lane_cdb[MAX_NUM_LANES];
>  	struct regmap *regmap_rx_lane_cdb[MAX_NUM_LANES];
> +	struct regmap *regmap_phy_pcs_lane_cdb[MAX_NUM_LANES];
>  	struct regmap *regmap_dptx_phy_reg;
>  	struct regmap_field *phy_pll_cfg;
>  	struct regmap_field *phy_pma_cmn_ctrl_1;
>  	struct regmap_field *phy_pma_cmn_ctrl_2;
>  	struct regmap_field *phy_pma_pll_raw_ctrl;
>  	struct regmap_field *phy_reset_ctrl;
> +	struct regmap_field *phy_pcs_iso_link_ctrl_1[MAX_NUM_LANES];
>  	struct clk *clks[CDNS_TORRENT_REFCLK_DRIVER + 1];
>  	struct clk_onecell_data clk_data;
>  };
> @@ -456,6 +468,22 @@ static const struct regmap_config cdns_torrent_common_cdb_config = {
>  	.reg_read = cdns_regmap_read,
>  };
>  
> +#define TORRENT_PHY_PCS_LANE_CDB_REGMAP_CONF(n) \
> +{ \
> +	.name = "torrent_phy_pcs_lane" n "_cdb", \
> +	.reg_stride = 1, \
> +	.fast_io = true, \
> +	.reg_write = cdns_regmap_write, \
> +	.reg_read = cdns_regmap_read, \
> +}
> +
> +static const struct regmap_config cdns_torrent_phy_pcs_lane_cdb_config[] = {
> +	TORRENT_PHY_PCS_LANE_CDB_REGMAP_CONF("0"),
> +	TORRENT_PHY_PCS_LANE_CDB_REGMAP_CONF("1"),
> +	TORRENT_PHY_PCS_LANE_CDB_REGMAP_CONF("2"),
> +	TORRENT_PHY_PCS_LANE_CDB_REGMAP_CONF("3"),
> +};
> +
>  static const struct regmap_config cdns_torrent_phy_pcs_cmn_cdb_config = {
>  	.name = "torrent_phy_pcs_cmn_cdb",
>  	.reg_stride = 1,
> @@ -1546,6 +1574,16 @@ static int cdns_torrent_phy_on(struct phy *phy)
>  		return ret;
>  	}
>  
> +	if (inst->phy_type == TYPE_PCIE || inst->phy_type == TYPE_USB) {
> +		ret = regmap_field_read_poll_timeout(cdns_phy->phy_pcs_iso_link_ctrl_1[inst->mlane],
> +						     read_val, !read_val, 1000,
> +						     PLL_LOCK_TIMEOUT);
> +		if (ret == -ETIMEDOUT) {
> +			dev_err(cdns_phy->dev, "Timeout waiting for PHY status ready\n");
> +			return ret;
> +		}
> +	}
> +
>  	mdelay(10);

With the above polling, this mdelay() shouldn't be required.

Thanks
Kishon