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Commit 73893a34 authored by Rajat Gupta's avatar Rajat Gupta
Browse files

disp: msm: dp: add support for diff values of pre-emp and swing levels 



Update the DP controller and PHY programming to support different
values for pre-emp and voltage swing levels at different link rates.

Change-Id: I974c47cd1bf71b76dea4f270031a9cdfe320725e
Signed-off-by: default avatarRajat Gupta <rajatgu@codeaurora.org>
parent f353c2f5

msm/dp/dp_catalog.c

+45 −3
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0-only

/*

 * Copyright (c) 2017-2019, The Linux Foundation. All rights reserved.

 * Copyright (c) 2017-2020, The Linux Foundation. All rights reserved.

 */
@@ -74,6 +74,34 @@ static u8 const vm_voltage_swing[4][4] = { 
	{0xFF, 0xFF, 0xFF, 0xFF}  /* sw1, 1.2 v, optional */

};



static u8 const vm_pre_emphasis_hbr3_hbr2[4][4] = {

	{0x00, 0x0C, 0x15, 0x1A},

	{0x02, 0x0E, 0x16, 0xFF},

	{0x02, 0x11, 0xFF, 0xFF},

	{0x04, 0xFF, 0xFF, 0xFF}

};



static u8 const vm_voltage_swing_hbr3_hbr2[4][4] = {

	{0x02, 0x12, 0x16, 0x1A},

	{0x09, 0x19, 0x1F, 0xFF},

	{0x10, 0x1F, 0xFF, 0xFF},

	{0x1F, 0xFF, 0xFF, 0xFF}

};



static u8 const vm_pre_emphasis_hbr_rbr[4][4] = {

	{0x00, 0x0C, 0x14, 0x19},

	{0x00, 0x0B, 0x12, 0xFF},

	{0x00, 0x0B, 0xFF, 0xFF},

	{0x04, 0xFF, 0xFF, 0xFF}

};



static u8 const vm_voltage_swing_hbr_rbr[4][4] = {

	{0x08, 0x0F, 0x16, 0x1F},

	{0x11, 0x1E, 0x1F, 0xFF},

	{0x19, 0x1F, 0xFF, 0xFF},

	{0x1F, 0xFF, 0xFF, 0xFF}

};



enum dp_flush_bit {

	DP_PPS_FLUSH,

	DP_DHDR_FLUSH,
@@ -1721,6 +1749,7 @@ static void dp_catalog_ctrl_update_vx_px(struct dp_catalog_ctrl *ctrl, 
	struct dp_catalog_private *catalog;

	struct dp_io_data *io_data;

	u8 value0, value1;

	u32 version;



	if (!ctrl) {

		DP_ERR("invalid input\n");
@@ -1731,8 +1760,21 @@ static void dp_catalog_ctrl_update_vx_px(struct dp_catalog_ctrl *ctrl, 


	DP_DEBUG("hw: v=%d p=%d\n", v_level, p_level);



	io_data = catalog->io.dp_ahb;

	version = dp_read(DP_HW_VERSION);



	if (version == 0x10020004) {

		if (high) {

			value0 = vm_voltage_swing_hbr3_hbr2[v_level][p_level];

			value1 = vm_pre_emphasis_hbr3_hbr2[v_level][p_level];

		} else {

			value0 = vm_voltage_swing_hbr_rbr[v_level][p_level];

			value1 = vm_pre_emphasis_hbr_rbr[v_level][p_level];

		}

	} else {

		value0 = vm_voltage_swing[v_level][p_level];

		value1 = vm_pre_emphasis[v_level][p_level];

	}



	/* program default setting first */