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

From: Jyri Sarha
Date: Tue Mar 24 2020 - 04:00:28 EST


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@xxxxxx>
>> ---
>> 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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