rk3399_mipi.c
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/*
* Copyright (c) 2017, Fuzhou Rockchip Electronics Co., Ltd
* Author: Eric Gao <eric.gao@rock-chips.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#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;
/* Select mipi dsi source, big or little vop */
static int rk_mipi_dsi_source_select(struct udevice *dev)
{
struct rk_mipi_priv *priv = dev_get_priv(dev);
struct rk3399_grf_regs *grf = priv->grf;
struct display_plat *disp_uc_plat = dev_get_uclass_platdata(dev);
/* Select the video source */
switch (disp_uc_plat->source_id) {
case VOP_B:
rk_clrsetreg(&grf->soc_con20, GRF_DSI0_VOP_SEL_MASK,
GRF_DSI0_VOP_SEL_B << GRF_DSI0_VOP_SEL_SHIFT);
break;
case VOP_L:
rk_clrsetreg(&grf->soc_con20, GRF_DSI0_VOP_SEL_MASK,
GRF_DSI0_VOP_SEL_L << GRF_DSI0_VOP_SEL_SHIFT);
break;
default:
debug("%s: Invalid VOP id\n", __func__);
return -EINVAL;
}
return 0;
}
/* Setup mipi dphy working mode */
static void rk_mipi_dphy_mode_set(struct udevice *dev)
{
struct rk_mipi_priv *priv = dev_get_priv(dev);
struct rk3399_grf_regs *grf = priv->grf;
int val;
/* Set Controller as TX mode */
val = GRF_DPHY_TX0_RXMODE_DIS << GRF_DPHY_TX0_RXMODE_SHIFT;
rk_clrsetreg(&grf->soc_con22, GRF_DPHY_TX0_RXMODE_MASK, val);
/* Exit tx stop mode */
val |= GRF_DPHY_TX0_TXSTOPMODE_DIS << GRF_DPHY_TX0_TXSTOPMODE_SHIFT;
rk_clrsetreg(&grf->soc_con22, GRF_DPHY_TX0_TXSTOPMODE_MASK, val);
/* Disable turnequest */
val |= GRF_DPHY_TX0_TURNREQUEST_DIS << GRF_DPHY_TX0_TURNREQUEST_SHIFT;
rk_clrsetreg(&grf->soc_con22, GRF_DPHY_TX0_TURNREQUEST_MASK, val);
}
/*
* This function is called by rk_display_init() using rk_mipi_dsi_enable() and
* rk_mipi_phy_enable() to initialize mipi controller and dphy. If success,
* enable backlight.
*/
static int rk_display_enable(struct udevice *dev, int panel_bpp,
const struct display_timing *timing)
{
int ret;
struct rk_mipi_priv *priv = dev_get_priv(dev);
/* Fill the mipi controller parameter */
priv->ref_clk = 24 * MHz;
priv->sys_clk = priv->ref_clk;
priv->pix_clk = timing->pixelclock.typ;
priv->phy_clk = priv->pix_clk * 6;
priv->txbyte_clk = priv->phy_clk / 8;
priv->txesc_clk = 20 * MHz;
/* Select vop port, big or little */
rk_mipi_dsi_source_select(dev);
/* Set mipi dphy work mode */
rk_mipi_dphy_mode_set(dev);
/* Config and enable mipi dsi according to timing */
ret = rk_mipi_dsi_enable(dev, timing);
if (ret) {
debug("%s: rk_mipi_dsi_enable() failed (err=%d)\n",
__func__, ret);
return ret;
}
/* Config and enable mipi phy */
ret = rk_mipi_phy_enable(dev);
if (ret) {
debug("%s: rk_mipi_phy_enable() failed (err=%d)\n",
__func__, ret);
return ret;
}
/* Enable backlight */
ret = panel_enable_backlight(priv->panel);
if (ret) {
debug("%s: panel_enable_backlight() failed (err=%d)\n",
__func__, ret);
return ret;
}
return 0;
}
static int rk_mipi_ofdata_to_platdata(struct udevice *dev)
{
struct rk_mipi_priv *priv = dev_get_priv(dev);
priv->grf = syscon_get_first_range(ROCKCHIP_SYSCON_GRF);
if (priv->grf <= 0) {
debug("%s: Get syscon grf failed (ret=%p)\n",
__func__, priv->grf);
return -ENXIO;
}
priv->regs = dev_read_addr(dev);
if (priv->regs == FDT_ADDR_T_NONE) {
debug("%s: Get MIPI dsi address failed\n", __func__);
return -ENXIO;
}
return 0;
}
/*
* Probe function: check panel existence and readingit's timing. Then config
* mipi dsi controller and enable it according to the timing parameter.
*/
static int rk_mipi_probe(struct udevice *dev)
{
int ret;
struct rk_mipi_priv *priv = dev_get_priv(dev);
ret = uclass_get_device_by_phandle(UCLASS_PANEL, dev, "rockchip,panel",
&priv->panel);
if (ret) {
debug("%s: Can not find panel (err=%d)\n", __func__, ret);
return ret;
}
return 0;
}
static const struct dm_display_ops rk_mipi_dsi_ops = {
.read_timing = rk_mipi_read_timing,
.enable = rk_display_enable,
};
static const struct udevice_id rk_mipi_dsi_ids[] = {
{ .compatible = "rockchip,rk3399_mipi_dsi" },
{ }
};
U_BOOT_DRIVER(rk_mipi_dsi) = {
.name = "rk_mipi_dsi",
.id = UCLASS_DISPLAY,
.of_match = rk_mipi_dsi_ids,
.ofdata_to_platdata = rk_mipi_ofdata_to_platdata,
.probe = rk_mipi_probe,
.ops = &rk_mipi_dsi_ops,
.priv_auto_alloc_size = sizeof(struct rk_mipi_priv),
};