linux-kernel - Re: [PATCH v2 2/2] phy: ti: j721e-wiz: Implement DisplayPort mode to the wiz driver

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Date:   Tue, 24 Mar 2020 10:00:19 +0200
From:   Jyri Sarha <jsarha@...com>
To:     Kishon Vijay Abraham I <kishon@...com>,
        <linux-kernel@...r.kernel.org>
CC:     <tomi.valkeinen@...com>, <praneeth@...com>, <yamonkar@...ence.com>,
        <sjakhade@...ence.com>, <robh+dt@...nel.org>, <rogerq@...com>
Subject: Re: [PATCH v2 2/2] phy: ti: j721e-wiz: Implement DisplayPort mode to
 the wiz driver

On 09/01/2020 09:44, Kishon Vijay Abraham I wrote:
> Hi Jyri,
> 
> On 08/01/20 2:00 PM, Jyri Sarha wrote:
>> For DisplayPort use we need to set WIZ_CONFIG_LANECTL register's
>> P_STANDARD_MODE bits to "mode 3". In the DisplayPort use also the
>> P_ENABLE bits of the same register are set to P_ENABLE instead of
>> P_ENABLE_FORCE, so that the DisplayPort driver can enable and disable
>> the lane as needed. The DisplayPort mode is selected according to
>> "cdns,phy-type"-properties found in link subnodes under the managed
>> serdes (see "ti,sierra-phy-t0" and "ti,j721e-serdes-10g" devicetree
>> bindings for details). All other values of "cdns,phy-type"-property
>> but PHY_TYPE_DP will set P_STANDARD_MODE bits to 0 and P_ENABLE bits
>> to force enable.
>>
>> Signed-off-by: Jyri Sarha <jsarha@...com>
>> ---
>>  drivers/phy/ti/phy-j721e-wiz.c | 59 +++++++++++++++++++++++++++++++---
>>  1 file changed, 55 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/phy/ti/phy-j721e-wiz.c b/drivers/phy/ti/phy-j721e-wiz.c
>> index b5f6019e5c7d..22bc04846cdb 100644
>> --- a/drivers/phy/ti/phy-j721e-wiz.c
>> +++ b/drivers/phy/ti/phy-j721e-wiz.c
>> @@ -20,6 +20,7 @@
>>  #include <linux/pm_runtime.h>
>>  #include <linux/regmap.h>
>>  #include <linux/reset-controller.h>
>> +#include <dt-bindings/phy/phy.h>
>>  
>>  #define WIZ_SERDES_CTRL		0x404
>>  #define WIZ_SERDES_TOP_CTRL	0x408
>> @@ -78,6 +79,8 @@ static const struct reg_field p_enable[WIZ_MAX_LANES] = {
>>  	REG_FIELD(WIZ_LANECTL(3), 30, 31),
>>  };
>>  
>> +enum p_enable { P_ENABLE = 2, P_ENABLE_FORCE = 1, P_ENABLE_DISABLE = 0 };
>> +
>>  static const struct reg_field p_align[WIZ_MAX_LANES] = {
>>  	REG_FIELD(WIZ_LANECTL(0), 29, 29),
>>  	REG_FIELD(WIZ_LANECTL(1), 29, 29),
>> @@ -220,6 +223,7 @@ struct wiz {
>>  	struct reset_controller_dev wiz_phy_reset_dev;
>>  	struct gpio_desc	*gpio_typec_dir;
>>  	int			typec_dir_delay;
>> +	u32 lane_phy_type[WIZ_MAX_LANES];
>>  };
>>  
>>  static int wiz_reset(struct wiz *wiz)
>> @@ -242,12 +246,17 @@ static int wiz_reset(struct wiz *wiz)
>>  static int wiz_mode_select(struct wiz *wiz)
>>  {
>>  	u32 num_lanes = wiz->num_lanes;
>> +	enum wiz_lane_standard_mode mode;
>>  	int ret;
>>  	int i;
>>  
>>  	for (i = 0; i < num_lanes; i++) {
>> -		ret = regmap_field_write(wiz->p_standard_mode[i],
>> -					 LANE_MODE_GEN4);
>> +		if (wiz->lane_phy_type[i] == PHY_TYPE_DP)
>> +			mode = LANE_MODE_GEN1;
>> +		else
>> +			mode = LANE_MODE_GEN4;
>> +
>> +		ret = regmap_field_write(wiz->p_standard_mode[i], mode);
>>  		if (ret)
>>  			return ret;
>>  	}
>> @@ -707,7 +716,7 @@ static int wiz_phy_reset_assert(struct reset_controller_dev *rcdev,
>>  		return ret;
>>  	}
>>  
>> -	ret = regmap_field_write(wiz->p_enable[id - 1], false);
>> +	ret = regmap_field_write(wiz->p_enable[id - 1], P_ENABLE_DISABLE);
>>  	return ret;
>>  }
>>  
>> @@ -734,7 +743,11 @@ static int wiz_phy_reset_deassert(struct reset_controller_dev *rcdev,
>>  		return ret;
>>  	}
>>  
>> -	ret = regmap_field_write(wiz->p_enable[id - 1], true);
>> +	if (wiz->lane_phy_type[id - 1] == PHY_TYPE_DP)
>> +		ret = regmap_field_write(wiz->p_enable[id - 1], P_ENABLE);
>> +	else
>> +		ret = regmap_field_write(wiz->p_enable[id - 1], P_ENABLE_FORCE);
>> +
>>  	return ret;
>>  }
>>  
>> @@ -761,6 +774,40 @@ static const struct of_device_id wiz_id_table[] = {
>>  };
>>  MODULE_DEVICE_TABLE(of, wiz_id_table);
>>  
>> +static int wiz_get_lane_phy_types(struct device *dev, struct wiz *wiz)
>> +{
>> +	struct device_node *serdes, *subnode;
>> +
>> +	serdes = of_get_child_by_name(dev->of_node, "serdes");
>> +	if (!serdes) {
>> +		dev_err(dev, "%s: Getting \"serdes\"-node failed\n", __func__);
>> +		return -EINVAL;
>> +	}
>> +
>> +	for_each_child_of_node(serdes, subnode) {
>> +		u32 reg, num_lanes = 1, phy_type = PHY_NONE;
>> +		int ret, i;
>> +
>> +		ret = of_property_read_u32(subnode, "reg", &reg);
>> +		if (ret) {
>> +			dev_err(dev,
>> +				"%s: Reading \"reg\" from \"%s\" failed: %d\n",
>> +				__func__, subnode->name, ret);
>> +			return ret;
>> +		}
>> +		of_property_read_u32(subnode, "cdns,num-lanes", &num_lanes);
>> +		of_property_read_u32(subnode, "cdns,phy-type", &phy_type);
> This would require the Torrent bindings to be Reviewed and Acked.
> 

I think they are now in your next branch. Could you please pick this one
up too?

BR,
Jyri


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