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phy: Add DisplayPort configuration options 

Allow DisplayPort PHYs to be configured through the generic
functions through a custom structure added to the generic union.
The configuration structure is used for reconfiguration of
DisplayPort PHYs during link training operation.

The parameters added here are the ones defined in the DisplayPort
spec v1.4 which include link rate, number of lanes, voltage swing
and pre-emphasis.

Add the DisplayPort phy mode to the generic phy_mode enum.

Signed-off-by: Yuti Amonkar <yamonkar@cadence.com>
Reviewed-by: Maxime Ripard <mripard@kernel.org>
Reviewed-by: Jyri Sarha <jsarha@ti.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
This commit is contained in:
Yuti Amonkar 2020-01-06 13:22:40 +01:00 committed by Kishon Vijay Abraham I
parent e7b4aaf051
commit 42d068472d
2 changed files with 100 additions and 0 deletions
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95
include/linux/phy/phy-dp.h Normal file
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@ -0,0 +1,95 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2019 Cadence Design Systems Inc.
*/
#ifndef __PHY_DP_H_
#define __PHY_DP_H_
#include <linux/types.h>
/**
* struct phy_configure_opts_dp - DisplayPort PHY configuration set
*
* This structure is used to represent the configuration state of a
* DisplayPort phy.
*/
struct phy_configure_opts_dp {
/**
* @link_rate:
*
* Link Rate, in Mb/s, of the main link.
*
* Allowed values: 1620, 2160, 2430, 2700, 3240, 4320, 5400, 8100 Mb/s
*/
unsigned int link_rate;
/**
* @lanes:
*
* Number of active, consecutive, data lanes, starting from
* lane 0, used for the transmissions on main link.
*
* Allowed values: 1, 2, 4
*/
unsigned int lanes;
/**
* @voltage:
*
* Voltage swing levels, as specified by DisplayPort specification,
* to be used by particular lanes. One value per lane.
* voltage[0] is for lane 0, voltage[1] is for lane 1, etc.
*
* Maximum value: 3
*/
unsigned int voltage[4];
/**
* @pre:
*
* Pre-emphasis levels, as specified by DisplayPort specification, to be
* used by particular lanes. One value per lane.
*
* Maximum value: 3
*/
unsigned int pre[4];
/**
* @ssc:
*
* Flag indicating, whether or not to enable spread-spectrum clocking.
*
*/
u8 ssc : 1;
/**
* @set_rate:
*
* Flag indicating, whether or not reconfigure link rate and SSC to
* requested values.
*
*/
u8 set_rate : 1;
/**
* @set_lanes:
*
* Flag indicating, whether or not reconfigure lane count to
* requested value.
*
*/
u8 set_lanes : 1;
/**
* @set_voltages:
*
* Flag indicating, whether or not reconfigure voltage swing
* and pre-emphasis to requested values. Only lanes specified
* by "lanes" parameter will be affected.
*
*/
u8 set_voltages : 1;
};
#endif /* __PHY_DP_H_ */

5
include/linux/phy/phy.h
View File

@ -16,6 +16,7 @@
#include <linux/pm_runtime.h>
#include <linux/regulator/consumer.h>
#include <linux/phy/phy-dp.h>
#include <linux/phy/phy-mipi-dphy.h>
struct phy;
@ -40,6 +41,7 @@ enum phy_mode {
PHY_MODE_MIPI_DPHY,
PHY_MODE_SATA,
PHY_MODE_LVDS,
PHY_MODE_DP
};
/**
@ -47,9 +49,12 @@ enum phy_mode {
*
* @mipi_dphy: Configuration set applicable for phys supporting
* the MIPI_DPHY phy mode.
* @dp: Configuration set applicable for phys supporting
* the DisplayPort protocol.
*/
union phy_configure_opts {
struct phy_configure_opts_mipi_dphy mipi_dphy;
struct phy_configure_opts_dp dp;
};
/**