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/*
* This file is part of the coreboot project.
*
* Copyright 2019 MediaTek Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <assert.h>
#include <device/mmio.h>
#include <delay.h>
#include <soc/dsi.h>
#include <soc/pll.h>
void mtk_dsi_configure_mipi_tx(int data_rate, u32 lanes)
{
unsigned int txdiv, txdiv0, txdiv1;
u64 pcw;
if (data_rate >= 2000) {
txdiv = 1;
txdiv0 = 0;
txdiv1 = 0;
} else if (data_rate >= 1000) {
txdiv = 2;
txdiv0 = 1;
txdiv1 = 0;
} else if (data_rate >= 500) {
txdiv = 4;
txdiv0 = 2;
txdiv1 = 0;
} else if (data_rate > 250) {
/* Be aware that 250 is a special case that must use txdiv=4. */
txdiv = 8;
txdiv0 = 3;
txdiv1 = 0;
} else {
/* MIN = 125 */
assert(data_rate >= MTK_DSI_DATA_RATE_MIN_MHZ);
txdiv = 16;
txdiv0 = 4;
txdiv1 = 0;
}
clrbits32(&mipi_tx->pll_con4, BIT(11) | BIT(10));
setbits32(&mipi_tx->pll_pwr, AD_DSI_PLL_SDM_PWR_ON);
udelay(30);
clrbits32(&mipi_tx->pll_pwr, AD_DSI_PLL_SDM_ISO_EN);
pcw = (u64)data_rate * (1 << txdiv0) * (1 << txdiv1);
pcw <<= 24;
pcw /= CLK26M_HZ / MHz;
write32(&mipi_tx->pll_con0, pcw);
clrsetbits32(&mipi_tx->pll_con1, RG_DSI_PLL_POSDIV, txdiv0 << 8);
udelay(30);
setbits32(&mipi_tx->pll_con1, RG_DSI_PLL_EN);
/* BG_LPF_EN / BG_CORE_EN */
write32(&mipi_tx->lane_con, 0x3fff0180);
udelay(40);
write32(&mipi_tx->lane_con, 0x3fff00c0);
/* Switch OFF each Lane */
clrbits32(&mipi_tx->d0_sw_ctl_en, DSI_SW_CTL_EN);
clrbits32(&mipi_tx->d1_sw_ctl_en, DSI_SW_CTL_EN);
clrbits32(&mipi_tx->d2_sw_ctl_en, DSI_SW_CTL_EN);
clrbits32(&mipi_tx->d3_sw_ctl_en, DSI_SW_CTL_EN);
clrbits32(&mipi_tx->ck_sw_ctl_en, DSI_SW_CTL_EN);
setbits32(&mipi_tx->ck_ckmode_en, DSI_CK_CKMODE_EN);
}
void mtk_dsi_reset(void)
{
write32(&dsi0->dsi_force_commit,
DSI_FORCE_COMMIT_USE_MMSYS | DSI_FORCE_COMMIT_ALWAYS);
write32(&dsi0->dsi_con_ctrl, 1);
write32(&dsi0->dsi_con_ctrl, 0);
}
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