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u-boot/drivers/video/rockchip/rk_mipi.c
Richard Röjfors 4c2808fd06 rockchip: video: mipi: Fix phy frequency setting 
There was an incorrect check when looping and finding the first
fast enough frequency in the freq_rang table. The code did
actually return the first that was either exactly correct or
too slow.

Signed-off-by: Richard Röjfors <richard@puffinpack.se>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
2018-11-30 19:03:16 +01:00

332 lines
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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2017, Fuzhou Rockchip Electronics Co., Ltd
* Author: Eric Gao <eric.gao@rock-chips.com>
*/
#include <common.h>
#include <clk.h>
#include <display.h>
#include <dm.h>
#include <fdtdec.h>
#include <panel.h>
#include <regmap.h>
#include "rk_mipi.h"
#include <syscon.h>
#include <asm/gpio.h>
#include <asm/hardware.h>
#include <asm/io.h>
#include <dm/uclass-internal.h>
#include <linux/kernel.h>
#include <asm/arch/clock.h>
#include <asm/arch/cru_rk3399.h>
#include <asm/arch/grf_rk3399.h>
#include <asm/arch/rockchip_mipi_dsi.h>
DECLARE_GLOBAL_DATA_PTR;
int rk_mipi_read_timing(struct udevice *dev,
struct display_timing *timing)
{
int ret;
ret = fdtdec_decode_display_timing(gd->fdt_blob, dev_of_offset(dev),
0, timing);
if (ret) {
debug("%s: Failed to decode display timing (ret=%d)\n",
__func__, ret);
return -EINVAL;
}
return 0;
}
/*
* Register write function used only for mipi dsi controller.
* Parameter:
* @regs: mipi controller address
* @reg: combination of regaddr(16bit)|bitswidth(8bit)|offset(8bit) you can
* use define in rk_mipi.h directly for this parameter
* @val: value that will be write to specified bits of register
*/
static void rk_mipi_dsi_write(uintptr_t regs, u32 reg, u32 val)
{
u32 dat;
u32 mask;
u32 offset = (reg >> OFFSET_SHIFT) & 0xff;
u32 bits = (reg >> BITS_SHIFT) & 0xff;
uintptr_t addr = (reg >> ADDR_SHIFT) + regs;
/* Mask for specifiled bits,the corresponding bits will be clear */
mask = ~((0xffffffff << offset) & (0xffffffff >> (32 - offset - bits)));
/* Make sure val in the available range */
val &= ~(0xffffffff << bits);
/* Get register's original val */
dat = readl(addr);
/* Clear specified bits */
dat &= mask;
/* Fill specified bits */
dat |= val << offset;
writel(dat, addr);
}
int rk_mipi_dsi_enable(struct udevice *dev,
const struct display_timing *timing)
{
int node, timing_node;
int val;
struct rk_mipi_priv *priv = dev_get_priv(dev);
uintptr_t regs = priv->regs;
u32 txbyte_clk = priv->txbyte_clk;
u32 txesc_clk = priv->txesc_clk;
txesc_clk = txbyte_clk/(txbyte_clk/txesc_clk + 1);
/* Set Display timing parameter */
rk_mipi_dsi_write(regs, VID_HSA_TIME, timing->hsync_len.typ);
rk_mipi_dsi_write(regs, VID_HBP_TIME, timing->hback_porch.typ);
rk_mipi_dsi_write(regs, VID_HLINE_TIME, (timing->hsync_len.typ
+ timing->hback_porch.typ + timing->hactive.typ
+ timing->hfront_porch.typ));
rk_mipi_dsi_write(regs, VID_VSA_LINES, timing->vsync_len.typ);
rk_mipi_dsi_write(regs, VID_VBP_LINES, timing->vback_porch.typ);
rk_mipi_dsi_write(regs, VID_VFP_LINES, timing->vfront_porch.typ);
rk_mipi_dsi_write(regs, VID_ACTIVE_LINES, timing->vactive.typ);
/* Set Signal Polarity */
val = (timing->flags & DISPLAY_FLAGS_HSYNC_LOW) ? 1 : 0;
rk_mipi_dsi_write(regs, HSYNC_ACTIVE_LOW, val);
val = (timing->flags & DISPLAY_FLAGS_VSYNC_LOW) ? 1 : 0;
rk_mipi_dsi_write(regs, VSYNC_ACTIVE_LOW, val);
val = (timing->flags & DISPLAY_FLAGS_DE_LOW) ? 1 : 0;
rk_mipi_dsi_write(regs, DATAEN_ACTIVE_LOW, val);
val = (timing->flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE) ? 1 : 0;
rk_mipi_dsi_write(regs, COLORM_ACTIVE_LOW, val);
/* Set video mode */
rk_mipi_dsi_write(regs, CMD_VIDEO_MODE, VIDEO_MODE);
/* Set video mode transmission type as burst mode */
rk_mipi_dsi_write(regs, VID_MODE_TYPE, BURST_MODE);
/* Set pix num in a video package */
rk_mipi_dsi_write(regs, VID_PKT_SIZE, 0x4b0);
/* Set dpi color coding depth 24 bit */
timing_node = fdt_subnode_offset(gd->fdt_blob, dev_of_offset(dev),
"display-timings");
node = fdt_first_subnode(gd->fdt_blob, timing_node);
val = fdtdec_get_int(gd->fdt_blob, node, "bits-per-pixel", -1);
switch (val) {
case 16:
rk_mipi_dsi_write(regs, DPI_COLOR_CODING, DPI_16BIT_CFG_1);
break;
case 24:
rk_mipi_dsi_write(regs, DPI_COLOR_CODING, DPI_24BIT);
break;
case 30:
rk_mipi_dsi_write(regs, DPI_COLOR_CODING, DPI_30BIT);
break;
default:
rk_mipi_dsi_write(regs, DPI_COLOR_CODING, DPI_24BIT);
}
/* Enable low power mode */
rk_mipi_dsi_write(regs, LP_CMD_EN, 1);
rk_mipi_dsi_write(regs, LP_HFP_EN, 1);
rk_mipi_dsi_write(regs, LP_VACT_EN, 1);
rk_mipi_dsi_write(regs, LP_VFP_EN, 1);
rk_mipi_dsi_write(regs, LP_VBP_EN, 1);
rk_mipi_dsi_write(regs, LP_VSA_EN, 1);
/* Division for timeout counter clk */
rk_mipi_dsi_write(regs, TO_CLK_DIVISION, 0x0a);
/* Tx esc clk division from txbyte clk */
rk_mipi_dsi_write(regs, TX_ESC_CLK_DIVISION, txbyte_clk/txesc_clk);
/* Timeout count for hs<->lp transation between Line period */
rk_mipi_dsi_write(regs, HSTX_TO_CNT, 0x3e8);
/* Phy State transfer timing */
rk_mipi_dsi_write(regs, PHY_STOP_WAIT_TIME, 32);
rk_mipi_dsi_write(regs, PHY_TXREQUESTCLKHS, 1);
rk_mipi_dsi_write(regs, PHY_HS2LP_TIME, 0x14);
rk_mipi_dsi_write(regs, PHY_LP2HS_TIME, 0x10);
rk_mipi_dsi_write(regs, MAX_RD_TIME, 0x2710);
/* Power on */
rk_mipi_dsi_write(regs, SHUTDOWNZ, 1);
return 0;
}
/* rk mipi dphy write function. It is used to write test data to dphy */
static void rk_mipi_phy_write(uintptr_t regs, unsigned char test_code,
unsigned char *test_data, unsigned char size)
{
int i = 0;
/* Write Test code */
rk_mipi_dsi_write(regs, PHY_TESTCLK, 1);
rk_mipi_dsi_write(regs, PHY_TESTDIN, test_code);
rk_mipi_dsi_write(regs, PHY_TESTEN, 1);
rk_mipi_dsi_write(regs, PHY_TESTCLK, 0);
rk_mipi_dsi_write(regs, PHY_TESTEN, 0);
/* Write Test data */
for (i = 0; i < size; i++) {
rk_mipi_dsi_write(regs, PHY_TESTCLK, 0);
rk_mipi_dsi_write(regs, PHY_TESTDIN, test_data[i]);
rk_mipi_dsi_write(regs, PHY_TESTCLK, 1);
}
}
/*
* Mipi dphy config function. Calculate the suitable prediv, feedback div,
* fsfreqrang value ,cap ,lpf and so on according to the given pix clk rate,
* and then enable phy.
*/
int rk_mipi_phy_enable(struct udevice *dev)
{
int i;
struct rk_mipi_priv *priv = dev_get_priv(dev);
uintptr_t regs = priv->regs;
u64 fbdiv;
u64 prediv = 1;
u32 max_fbdiv = 512;
u32 max_prediv, min_prediv;
u64 ddr_clk = priv->phy_clk;
u32 refclk = priv->ref_clk;
u32 remain = refclk;
unsigned char test_data[2] = {0};
int freq_rang[][2] = {
{90, 0x01}, {100, 0x10}, {110, 0x20}, {130, 0x01},
{140, 0x11}, {150, 0x21}, {170, 0x02}, {180, 0x12},
{200, 0x22}, {220, 0x03}, {240, 0x13}, {250, 0x23},
{270, 0x04}, {300, 0x14}, {330, 0x05}, {360, 0x15},
{400, 0x25}, {450, 0x06}, {500, 0x16}, {550, 0x07},
{600, 0x17}, {650, 0x08}, {700, 0x18}, {750, 0x09},
{800, 0x19}, {850, 0x29}, {900, 0x39}, {950, 0x0a},
{1000, 0x1a}, {1050, 0x2a}, {1100, 0x3a}, {1150, 0x0b},
{1200, 0x1b}, {1250, 0x2b}, {1300, 0x3b}, {1350, 0x0c},
{1400, 0x1c}, {1450, 0x2c}, {1500, 0x3c}
};
/* Shutdown mode */
rk_mipi_dsi_write(regs, PHY_SHUTDOWNZ, 0);
rk_mipi_dsi_write(regs, PHY_RSTZ, 0);
rk_mipi_dsi_write(regs, PHY_TESTCLR, 1);
/* Pll locking */
rk_mipi_dsi_write(regs, PHY_TESTCLR, 0);
/* config cp and lfp */
test_data[0] = 0x80 | (ddr_clk / (200 * MHz)) << 3 | 0x3;
rk_mipi_phy_write(regs, CODE_PLL_VCORANGE_VCOCAP, test_data, 1);
test_data[0] = 0x8;
rk_mipi_phy_write(regs, CODE_PLL_CPCTRL, test_data, 1);
test_data[0] = 0x80 | 0x40;
rk_mipi_phy_write(regs, CODE_PLL_LPF_CP, test_data, 1);
/* select the suitable value for fsfreqrang reg */
for (i = 0; i < ARRAY_SIZE(freq_rang); i++) {
if (ddr_clk / (MHz) <= freq_rang[i][0])
break;
}
if (i == ARRAY_SIZE(freq_rang)) {
debug("%s: Dphy freq out of range!\n", __func__);
return -EINVAL;
}
test_data[0] = freq_rang[i][1] << 1;
rk_mipi_phy_write(regs, CODE_HS_RX_LANE0, test_data, 1);
/*
* Calculate the best ddrclk and it's corresponding div value. If the
* given pixelclock is great than 250M, ddrclk will be fix 1500M.
* Otherwise,
* it's equal to ddr_clk= pixclk * 6. 40MHz >= refclk / prediv >= 5MHz
* according to spec.
*/
max_prediv = (refclk / (5 * MHz));
min_prediv = ((refclk / (40 * MHz)) ? (refclk / (40 * MHz) + 1) : 1);
debug("%s: DEBUG: max_prediv=%u, min_prediv=%u\n", __func__, max_prediv,
min_prediv);
if (max_prediv < min_prediv) {
debug("%s: Invalid refclk value\n", __func__);
return -EINVAL;
}
/* Calculate the best refclk and feedback division value for dphy pll */
for (i = min_prediv; i < max_prediv; i++) {
if ((ddr_clk * i % refclk < remain) &&
(ddr_clk * i / refclk) < max_fbdiv) {
prediv = i;
remain = ddr_clk * i % refclk;
}
}
fbdiv = ddr_clk * prediv / refclk;
ddr_clk = refclk * fbdiv / prediv;
priv->phy_clk = ddr_clk;
debug("%s: DEBUG: refclk=%u, refclk=%llu, fbdiv=%llu, phyclk=%llu\n",
__func__, refclk, prediv, fbdiv, ddr_clk);
/* config prediv and feedback reg */
test_data[0] = prediv - 1;
rk_mipi_phy_write(regs, CODE_PLL_INPUT_DIV_RAT, test_data, 1);
test_data[0] = (fbdiv - 1) & 0x1f;
rk_mipi_phy_write(regs, CODE_PLL_LOOP_DIV_RAT, test_data, 1);
test_data[0] = (fbdiv - 1) >> 5 | 0x80;
rk_mipi_phy_write(regs, CODE_PLL_LOOP_DIV_RAT, test_data, 1);
test_data[0] = 0x30;
rk_mipi_phy_write(regs, CODE_PLL_INPUT_LOOP_DIV_RAT, test_data, 1);
/* rest config */
test_data[0] = 0x4d;
rk_mipi_phy_write(regs, CODE_BANDGAP_BIAS_CTRL, test_data, 1);
test_data[0] = 0x3d;
rk_mipi_phy_write(regs, CODE_TERMINATION_CTRL, test_data, 1);
test_data[0] = 0xdf;
rk_mipi_phy_write(regs, CODE_TERMINATION_CTRL, test_data, 1);
test_data[0] = 0x7;
rk_mipi_phy_write(regs, CODE_AFE_BIAS_BANDGAP_ANOLOG, test_data, 1);
test_data[0] = 0x80 | 0x7;
rk_mipi_phy_write(regs, CODE_AFE_BIAS_BANDGAP_ANOLOG, test_data, 1);
test_data[0] = 0x80 | 15;
rk_mipi_phy_write(regs, CODE_HSTXDATALANEREQUSETSTATETIME,
test_data, 1);
test_data[0] = 0x80 | 85;
rk_mipi_phy_write(regs, CODE_HSTXDATALANEPREPARESTATETIME,
test_data, 1);
test_data[0] = 0x40 | 10;
rk_mipi_phy_write(regs, CODE_HSTXDATALANEHSZEROSTATETIME,
test_data, 1);
/* enter into stop mode */
rk_mipi_dsi_write(regs, N_LANES, 0x03);
rk_mipi_dsi_write(regs, PHY_ENABLECLK, 1);
rk_mipi_dsi_write(regs, PHY_FORCEPLL, 1);
rk_mipi_dsi_write(regs, PHY_SHUTDOWNZ, 1);
rk_mipi_dsi_write(regs, PHY_RSTZ, 1);
return 0;
}
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