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Date:   Fri, 1 Dec 2017 14:42:25 +0800
From:   Nickey Yang <nickey.yang@...k-chips.com>
To:     Matthias Kaehlcke <mka@...omium.org>
Cc:     robh+dt@...nel.org, heiko@...ech.de, mark.rutland@....com,
        airlied@...ux.ie, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        linux-rockchip@...ts.infradead.org, seanpaul@...omium.org,
        briannorris@...omium.org, hoegsberg@...il.com,
        architt@...eaurora.org, philippe.cornu@...com,
        yannick.fertre@...com, hl@...k-chips.com, zyw@...k-chips.com,
        xbl@...k-chips.com
Subject: Re: [PATCH v3 4/5] drm/rockchip: Add ROCKCHIP DW MIPI DSI controller
 driver

Hi Matthias,


On 2017年11月29日 04:48, Matthias Kaehlcke wrote:
> El Tue, Nov 28, 2017 at 07:20:05PM +0800 Nickey Yang ha dit:
>
>> Add the ROCKCHIP DSI controller driver that uses the Synopsys DesignWare
>> MIPI DSI host controller bridge.
>>
>> v2:
>>     add err_pllref, remove unnecessary encoder.enable & disable
>>     correct spelling mistakes
>> v3:
>>     call dw_mipi_dsi_unbind() in dw_mipi_dsi_rockchip_unbind()
>>     fix typo, use of_device_get_match_data(),
>>     change some ‘bind()’ logic into 'probe()'
>>     add 'dev_set_drvdata()'
>>
>> Signed-off-by: Nickey Yang <nickey.yang@...k-chips.com>
>> ---
>>   drivers/gpu/drm/rockchip/Kconfig                |    2 +-
>>   drivers/gpu/drm/rockchip/Makefile               |    2 +-
>>   drivers/gpu/drm/rockchip/dw-mipi-dsi.c          | 1349 -----------------------
>>   drivers/gpu/drm/rockchip/dw-mipi-dsi_rockchip.c |  764 +++++++++++++
>>   drivers/gpu/drm/rockchip/rockchip_drm_drv.c     |    2 +-
>>   drivers/gpu/drm/rockchip/rockchip_drm_drv.h     |    2 +-
>>   6 files changed, 768 insertions(+), 1353 deletions(-)
>>   delete mode 100644 drivers/gpu/drm/rockchip/dw-mipi-dsi.c
>>   create mode 100644 drivers/gpu/drm/rockchip/dw-mipi-dsi_rockchip.c
>>
>> diff --git a/drivers/gpu/drm/rockchip/Kconfig b/drivers/gpu/drm/rockchip/Kconfig
>> index 0ccc762..9eb4795 100644
>> --- a/drivers/gpu/drm/rockchip/Kconfig
>> +++ b/drivers/gpu/drm/rockchip/Kconfig
>> @@ -7,7 +7,7 @@ config DRM_ROCKCHIP
>>   	select VIDEOMODE_HELPERS
>>   	select DRM_ANALOGIX_DP if ROCKCHIP_ANALOGIX_DP
>>   	select DRM_DW_HDMI if ROCKCHIP_DW_HDMI
>> -	select DRM_MIPI_DSI if ROCKCHIP_DW_MIPI_DSI
>> +	select DRM_DW_MIPI_DSI if ROCKCHIP_DW_MIPI_DSI
>>   	select SND_SOC_HDMI_CODEC if ROCKCHIP_CDN_DP && SND_SOC
>>   	help
>>   	  Choose this option if you have a Rockchip soc chipset.
>> diff --git a/drivers/gpu/drm/rockchip/Makefile b/drivers/gpu/drm/rockchip/Makefile
>> index a314e21..c05fe47 100644
>> --- a/drivers/gpu/drm/rockchip/Makefile
>> +++ b/drivers/gpu/drm/rockchip/Makefile
>> @@ -11,7 +11,7 @@ rockchipdrm-$(CONFIG_DRM_FBDEV_EMULATION) += rockchip_drm_fbdev.o
>>   rockchipdrm-$(CONFIG_ROCKCHIP_ANALOGIX_DP) += analogix_dp-rockchip.o
>>   rockchipdrm-$(CONFIG_ROCKCHIP_CDN_DP) += cdn-dp-core.o cdn-dp-reg.o
>>   rockchipdrm-$(CONFIG_ROCKCHIP_DW_HDMI) += dw_hdmi-rockchip.o
>> -rockchipdrm-$(CONFIG_ROCKCHIP_DW_MIPI_DSI) += dw-mipi-dsi.o
>> +rockchipdrm-$(CONFIG_ROCKCHIP_DW_MIPI_DSI) += dw-mipi-dsi_rockchip.o
>>   rockchipdrm-$(CONFIG_ROCKCHIP_INNO_HDMI) += inno_hdmi.o
>>   rockchipdrm-$(CONFIG_ROCKCHIP_LVDS) += rockchip_lvds.o
>>   
>> diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
>> deleted file mode 100644
>> index b15755b..0000000
>> --- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
>> +++ /dev/null
>> @@ -1,1349 +0,0 @@
>> -/*
>> - * Copyright (c) 2016, Fuzhou Rockchip Electronics Co., Ltd
>> - *
>> - * 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; either version 2 of the License, or
>> - * (at your option) any later version.
>> - */
>> -#include <linux/clk.h>
>> -#include <linux/component.h>
>> -#include <linux/iopoll.h>
>> -#include <linux/math64.h>
>> -#include <linux/module.h>
>> -#include <linux/of_device.h>
>> -#include <linux/pm_runtime.h>
>> -#include <linux/regmap.h>
>> -#include <linux/reset.h>
>> -#include <linux/mfd/syscon.h>
>> -#include <drm/drm_atomic_helper.h>
>> -#include <drm/drm_crtc.h>
>> -#include <drm/drm_crtc_helper.h>
>> -#include <drm/drm_mipi_dsi.h>
>> -#include <drm/drm_of.h>
>> -#include <drm/drm_panel.h>
>> -#include <drm/drmP.h>
>> -#include <video/mipi_display.h>
>> -
>> -#include "rockchip_drm_drv.h"
>> -#include "rockchip_drm_vop.h"
>> -
>> -#define DRIVER_NAME    "dw-mipi-dsi"
>> -
>> -#define RK3288_GRF_SOC_CON6		0x025c
>> -#define RK3288_DSI0_SEL_VOP_LIT		BIT(6)
>> -#define RK3288_DSI1_SEL_VOP_LIT		BIT(9)
>> -
>> -#define RK3399_GRF_SOC_CON20		0x6250
>> -#define RK3399_DSI0_SEL_VOP_LIT		BIT(0)
>> -#define RK3399_DSI1_SEL_VOP_LIT		BIT(4)
>> -
>> -/* disable turnrequest, turndisable, forcetxstopmode, forcerxmode */
>> -#define RK3399_GRF_SOC_CON22		0x6258
>> -#define RK3399_GRF_DSI_MODE		0xffff0000
>> -
>> -#define DSI_VERSION			0x00
>> -#define DSI_PWR_UP			0x04
>> -#define RESET				0
>> -#define POWERUP				BIT(0)
>> -
>> -#define DSI_CLKMGR_CFG			0x08
>> -#define TO_CLK_DIVIDSION(div)		(((div) & 0xff) << 8)
>> -#define TX_ESC_CLK_DIVIDSION(div)	(((div) & 0xff) << 0)
>> -
>> -#define DSI_DPI_VCID			0x0c
>> -#define DPI_VID(vid)			(((vid) & 0x3) << 0)
>> -
>> -#define DSI_DPI_COLOR_CODING		0x10
>> -#define EN18_LOOSELY			BIT(8)
>> -#define DPI_COLOR_CODING_16BIT_1	0x0
>> -#define DPI_COLOR_CODING_16BIT_2	0x1
>> -#define DPI_COLOR_CODING_16BIT_3	0x2
>> -#define DPI_COLOR_CODING_18BIT_1	0x3
>> -#define DPI_COLOR_CODING_18BIT_2	0x4
>> -#define DPI_COLOR_CODING_24BIT		0x5
>> -
>> -#define DSI_DPI_CFG_POL			0x14
>> -#define COLORM_ACTIVE_LOW		BIT(4)
>> -#define SHUTD_ACTIVE_LOW		BIT(3)
>> -#define HSYNC_ACTIVE_LOW		BIT(2)
>> -#define VSYNC_ACTIVE_LOW		BIT(1)
>> -#define DATAEN_ACTIVE_LOW		BIT(0)
>> -
>> -#define DSI_DPI_LP_CMD_TIM		0x18
>> -#define OUTVACT_LPCMD_TIME(p)		(((p) & 0xff) << 16)
>> -#define INVACT_LPCMD_TIME(p)		((p) & 0xff)
>> -
>> -#define DSI_DBI_CFG			0x20
>> -#define DSI_DBI_CMDSIZE			0x28
>> -
>> -#define DSI_PCKHDL_CFG			0x2c
>> -#define EN_CRC_RX			BIT(4)
>> -#define EN_ECC_RX			BIT(3)
>> -#define EN_BTA				BIT(2)
>> -#define EN_EOTP_RX			BIT(1)
>> -#define EN_EOTP_TX			BIT(0)
>> -
>> -#define DSI_MODE_CFG			0x34
>> -#define ENABLE_VIDEO_MODE		0
>> -#define ENABLE_CMD_MODE			BIT(0)
>> -
>> -#define DSI_VID_MODE_CFG		0x38
>> -#define FRAME_BTA_ACK			BIT(14)
>> -#define ENABLE_LOW_POWER		(0x3f << 8)
>> -#define ENABLE_LOW_POWER_MASK		(0x3f << 8)
>> -#define VID_MODE_TYPE_NON_BURST_SYNC_PULSES	0x0
>> -#define VID_MODE_TYPE_NON_BURST_SYNC_EVENTS	0x1
>> -#define VID_MODE_TYPE_BURST			0x2
>> -#define VID_MODE_TYPE_MASK			0x3
>> -
>> -#define DSI_VID_PKT_SIZE		0x3c
>> -#define VID_PKT_SIZE(p)			(((p) & 0x3fff) << 0)
>> -#define VID_PKT_MAX_SIZE		0x3fff
>> -
>> -#define DSI_VID_HSA_TIME		0x48
>> -#define DSI_VID_HBP_TIME		0x4c
>> -#define DSI_VID_HLINE_TIME		0x50
>> -#define DSI_VID_VSA_LINES		0x54
>> -#define DSI_VID_VBP_LINES		0x58
>> -#define DSI_VID_VFP_LINES		0x5c
>> -#define DSI_VID_VACTIVE_LINES		0x60
>> -#define DSI_CMD_MODE_CFG		0x68
>> -#define MAX_RD_PKT_SIZE_LP		BIT(24)
>> -#define DCS_LW_TX_LP			BIT(19)
>> -#define DCS_SR_0P_TX_LP			BIT(18)
>> -#define DCS_SW_1P_TX_LP			BIT(17)
>> -#define DCS_SW_0P_TX_LP			BIT(16)
>> -#define GEN_LW_TX_LP			BIT(14)
>> -#define GEN_SR_2P_TX_LP			BIT(13)
>> -#define GEN_SR_1P_TX_LP			BIT(12)
>> -#define GEN_SR_0P_TX_LP			BIT(11)
>> -#define GEN_SW_2P_TX_LP			BIT(10)
>> -#define GEN_SW_1P_TX_LP			BIT(9)
>> -#define GEN_SW_0P_TX_LP			BIT(8)
>> -#define EN_ACK_RQST			BIT(1)
>> -#define EN_TEAR_FX			BIT(0)
>> -
>> -#define CMD_MODE_ALL_LP			(MAX_RD_PKT_SIZE_LP | \
>> -					 DCS_LW_TX_LP | \
>> -					 DCS_SR_0P_TX_LP | \
>> -					 DCS_SW_1P_TX_LP | \
>> -					 DCS_SW_0P_TX_LP | \
>> -					 GEN_LW_TX_LP | \
>> -					 GEN_SR_2P_TX_LP | \
>> -					 GEN_SR_1P_TX_LP | \
>> -					 GEN_SR_0P_TX_LP | \
>> -					 GEN_SW_2P_TX_LP | \
>> -					 GEN_SW_1P_TX_LP | \
>> -					 GEN_SW_0P_TX_LP)
>> -
>> -#define DSI_GEN_HDR			0x6c
>> -#define GEN_HDATA(data)			(((data) & 0xffff) << 8)
>> -#define GEN_HDATA_MASK			(0xffff << 8)
>> -#define GEN_HTYPE(type)			(((type) & 0xff) << 0)
>> -#define GEN_HTYPE_MASK			0xff
>> -
>> -#define DSI_GEN_PLD_DATA		0x70
>> -
>> -#define DSI_CMD_PKT_STATUS		0x74
>> -#define GEN_CMD_EMPTY			BIT(0)
>> -#define GEN_CMD_FULL			BIT(1)
>> -#define GEN_PLD_W_EMPTY			BIT(2)
>> -#define GEN_PLD_W_FULL			BIT(3)
>> -#define GEN_PLD_R_EMPTY			BIT(4)
>> -#define GEN_PLD_R_FULL			BIT(5)
>> -#define GEN_RD_CMD_BUSY			BIT(6)
>> -
>> -#define DSI_TO_CNT_CFG			0x78
>> -#define HSTX_TO_CNT(p)			(((p) & 0xffff) << 16)
>> -#define LPRX_TO_CNT(p)			((p) & 0xffff)
>> -
>> -#define DSI_BTA_TO_CNT			0x8c
>> -#define DSI_LPCLK_CTRL			0x94
>> -#define AUTO_CLKLANE_CTRL		BIT(1)
>> -#define PHY_TXREQUESTCLKHS		BIT(0)
>> -
>> -#define DSI_PHY_TMR_LPCLK_CFG		0x98
>> -#define PHY_CLKHS2LP_TIME(lbcc)		(((lbcc) & 0x3ff) << 16)
>> -#define PHY_CLKLP2HS_TIME(lbcc)		((lbcc) & 0x3ff)
>> -
>> -#define DSI_PHY_TMR_CFG			0x9c
>> -#define PHY_HS2LP_TIME(lbcc)		(((lbcc) & 0xff) << 24)
>> -#define PHY_LP2HS_TIME(lbcc)		(((lbcc) & 0xff) << 16)
>> -#define MAX_RD_TIME(lbcc)		((lbcc) & 0x7fff)
>> -
>> -#define DSI_PHY_RSTZ			0xa0
>> -#define PHY_DISFORCEPLL			0
>> -#define PHY_ENFORCEPLL			BIT(3)
>> -#define PHY_DISABLECLK			0
>> -#define PHY_ENABLECLK			BIT(2)
>> -#define PHY_RSTZ			0
>> -#define PHY_UNRSTZ			BIT(1)
>> -#define PHY_SHUTDOWNZ			0
>> -#define PHY_UNSHUTDOWNZ			BIT(0)
>> -
>> -#define DSI_PHY_IF_CFG			0xa4
>> -#define N_LANES(n)			((((n) - 1) & 0x3) << 0)
>> -#define PHY_STOP_WAIT_TIME(cycle)	(((cycle) & 0xff) << 8)
>> -
>> -#define DSI_PHY_STATUS			0xb0
>> -#define LOCK				BIT(0)
>> -#define STOP_STATE_CLK_LANE		BIT(2)
>> -
>> -#define DSI_PHY_TST_CTRL0		0xb4
>> -#define PHY_TESTCLK			BIT(1)
>> -#define PHY_UNTESTCLK			0
>> -#define PHY_TESTCLR			BIT(0)
>> -#define PHY_UNTESTCLR			0
>> -
>> -#define DSI_PHY_TST_CTRL1		0xb8
>> -#define PHY_TESTEN			BIT(16)
>> -#define PHY_UNTESTEN			0
>> -#define PHY_TESTDOUT(n)			(((n) & 0xff) << 8)
>> -#define PHY_TESTDIN(n)			(((n) & 0xff) << 0)
>> -
>> -#define DSI_INT_ST0			0xbc
>> -#define DSI_INT_ST1			0xc0
>> -#define DSI_INT_MSK0			0xc4
>> -#define DSI_INT_MSK1			0xc8
>> -
>> -#define PHY_STATUS_TIMEOUT_US		10000
>> -#define CMD_PKT_STATUS_TIMEOUT_US	20000
>> -
>> -#define BYPASS_VCO_RANGE	BIT(7)
>> -#define VCO_RANGE_CON_SEL(val)	(((val) & 0x7) << 3)
>> -#define VCO_IN_CAP_CON_DEFAULT	(0x0 << 1)
>> -#define VCO_IN_CAP_CON_LOW	(0x1 << 1)
>> -#define VCO_IN_CAP_CON_HIGH	(0x2 << 1)
>> -#define REF_BIAS_CUR_SEL	BIT(0)
>> -
>> -#define CP_CURRENT_3MA		BIT(3)
>> -#define CP_PROGRAM_EN		BIT(7)
>> -#define LPF_PROGRAM_EN		BIT(6)
>> -#define LPF_RESISTORS_20_KOHM	0
>> -
>> -#define HSFREQRANGE_SEL(val)	(((val) & 0x3f) << 1)
>> -
>> -#define INPUT_DIVIDER(val)	(((val) - 1) & 0x7f)
>> -#define LOW_PROGRAM_EN		0
>> -#define HIGH_PROGRAM_EN		BIT(7)
>> -#define LOOP_DIV_LOW_SEL(val)	(((val) - 1) & 0x1f)
>> -#define LOOP_DIV_HIGH_SEL(val)	((((val) - 1) >> 5) & 0x1f)
>> -#define PLL_LOOP_DIV_EN		BIT(5)
>> -#define PLL_INPUT_DIV_EN	BIT(4)
>> -
>> -#define POWER_CONTROL		BIT(6)
>> -#define INTERNAL_REG_CURRENT	BIT(3)
>> -#define BIAS_BLOCK_ON		BIT(2)
>> -#define BANDGAP_ON		BIT(0)
>> -
>> -#define TER_RESISTOR_HIGH	BIT(7)
>> -#define	TER_RESISTOR_LOW	0
>> -#define LEVEL_SHIFTERS_ON	BIT(6)
>> -#define TER_CAL_DONE		BIT(5)
>> -#define SETRD_MAX		(0x7 << 2)
>> -#define POWER_MANAGE		BIT(1)
>> -#define TER_RESISTORS_ON	BIT(0)
>> -
>> -#define BIASEXTR_SEL(val)	((val) & 0x7)
>> -#define BANDGAP_SEL(val)	((val) & 0x7)
>> -#define TLP_PROGRAM_EN		BIT(7)
>> -#define THS_PRE_PROGRAM_EN	BIT(7)
>> -#define THS_ZERO_PROGRAM_EN	BIT(6)
>> -
>> -#define DW_MIPI_NEEDS_PHY_CFG_CLK	BIT(0)
>> -#define DW_MIPI_NEEDS_GRF_CLK		BIT(1)
>> -
>> -enum {
>> -	BANDGAP_97_07,
>> -	BANDGAP_98_05,
>> -	BANDGAP_99_02,
>> -	BANDGAP_100_00,
>> -	BANDGAP_93_17,
>> -	BANDGAP_94_15,
>> -	BANDGAP_95_12,
>> -	BANDGAP_96_10,
>> -};
>> -
>> -enum {
>> -	BIASEXTR_87_1,
>> -	BIASEXTR_91_5,
>> -	BIASEXTR_95_9,
>> -	BIASEXTR_100,
>> -	BIASEXTR_105_94,
>> -	BIASEXTR_111_88,
>> -	BIASEXTR_118_8,
>> -	BIASEXTR_127_7,
>> -};
>> -
>> -struct dw_mipi_dsi_plat_data {
>> -	u32 dsi0_en_bit;
>> -	u32 dsi1_en_bit;
>> -	u32 grf_switch_reg;
>> -	u32 grf_dsi0_mode;
>> -	u32 grf_dsi0_mode_reg;
>> -	unsigned int flags;
>> -	unsigned int max_data_lanes;
>> -};
>> -
>> -struct dw_mipi_dsi {
>> -	struct drm_encoder encoder;
>> -	struct drm_connector connector;
>> -	struct mipi_dsi_host dsi_host;
>> -	struct drm_panel *panel;
>> -	struct device *dev;
>> -	struct regmap *grf_regmap;
>> -	void __iomem *base;
>> -
>> -	struct clk *grf_clk;
>> -	struct clk *pllref_clk;
>> -	struct clk *pclk;
>> -	struct clk *phy_cfg_clk;
>> -
>> -	int dpms_mode;
>> -	unsigned int lane_mbps; /* per lane */
>> -	u32 channel;
>> -	u32 lanes;
>> -	u32 format;
>> -	u16 input_div;
>> -	u16 feedback_div;
>> -	unsigned long mode_flags;
>> -
>> -	const struct dw_mipi_dsi_plat_data *pdata;
>> -};
>> -
>> -enum dw_mipi_dsi_mode {
>> -	DW_MIPI_DSI_CMD_MODE,
>> -	DW_MIPI_DSI_VID_MODE,
>> -};
>> -
>> -struct dphy_pll_testdin_map {
>> -	unsigned int max_mbps;
>> -	u8 testdin;
>> -};
>> -
>> -/* The table is based on 27MHz DPHY pll reference clock. */
>> -static const struct dphy_pll_testdin_map dptdin_map[] = {
>> -	{  90, 0x00}, { 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}
>> -};
>> -
>> -static int max_mbps_to_testdin(unsigned int max_mbps)
>> -{
>> -	int i;
>> -
>> -	for (i = 0; i < ARRAY_SIZE(dptdin_map); i++)
>> -		if (dptdin_map[i].max_mbps > max_mbps)
>> -			return dptdin_map[i].testdin;
>> -
>> -	return -EINVAL;
>> -}
>> -
>> -/*
>> - * The controller should generate 2 frames before
>> - * preparing the peripheral.
>> - */
>> -static void dw_mipi_dsi_wait_for_two_frames(struct drm_display_mode *mode)
>> -{
>> -	int refresh, two_frames;
>> -
>> -	refresh = drm_mode_vrefresh(mode);
>> -	two_frames = DIV_ROUND_UP(MSEC_PER_SEC, refresh) * 2;
>> -	msleep(two_frames);
>> -}
>> -
>> -static inline struct dw_mipi_dsi *host_to_dsi(struct mipi_dsi_host *host)
>> -{
>> -	return container_of(host, struct dw_mipi_dsi, dsi_host);
>> -}
>> -
>> -static inline struct dw_mipi_dsi *con_to_dsi(struct drm_connector *con)
>> -{
>> -	return container_of(con, struct dw_mipi_dsi, connector);
>> -}
>> -
>> -static inline struct dw_mipi_dsi *encoder_to_dsi(struct drm_encoder *encoder)
>> -{
>> -	return container_of(encoder, struct dw_mipi_dsi, encoder);
>> -}
>> -
>> -static inline void dsi_write(struct dw_mipi_dsi *dsi, u32 reg, u32 val)
>> -{
>> -	writel(val, dsi->base + reg);
>> -}
>> -
>> -static inline u32 dsi_read(struct dw_mipi_dsi *dsi, u32 reg)
>> -{
>> -	return readl(dsi->base + reg);
>> -}
>> -
>> -static void dw_mipi_dsi_phy_write(struct dw_mipi_dsi *dsi, u8 test_code,
>> -				  u8 test_data)
>> -{
>> -	/*
>> -	 * With the falling edge on TESTCLK, the TESTDIN[7:0] signal content
>> -	 * is latched internally as the current test code. Test data is
>> -	 * programmed internally by rising edge on TESTCLK.
>> -	 */
>> -	dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_TESTCLK | PHY_UNTESTCLR);
>> -
>> -	dsi_write(dsi, DSI_PHY_TST_CTRL1, PHY_TESTEN | PHY_TESTDOUT(0) |
>> -					  PHY_TESTDIN(test_code));
>> -
>> -	dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_UNTESTCLK | PHY_UNTESTCLR);
>> -
>> -	dsi_write(dsi, DSI_PHY_TST_CTRL1, PHY_UNTESTEN | PHY_TESTDOUT(0) |
>> -					  PHY_TESTDIN(test_data));
>> -
>> -	dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_TESTCLK | PHY_UNTESTCLR);
>> -}
>> -
>> -/**
>> - * ns2bc - Nanoseconds to byte clock cycles
>> - */
>> -static inline unsigned int ns2bc(struct dw_mipi_dsi *dsi, int ns)
>> -{
>> -	return DIV_ROUND_UP(ns * dsi->lane_mbps / 8, 1000);
>> -}
>> -
>> -/**
>> - * ns2ui - Nanoseconds to UI time periods
>> - */
>> -static inline unsigned int ns2ui(struct dw_mipi_dsi *dsi, int ns)
>> -{
>> -	return DIV_ROUND_UP(ns * dsi->lane_mbps, 1000);
>> -}
>> -
>> -static int dw_mipi_dsi_phy_init(struct dw_mipi_dsi *dsi)
>> -{
>> -	int ret, testdin, vco, val;
>> -
>> -	vco = (dsi->lane_mbps < 200) ? 0 : (dsi->lane_mbps + 100) / 200;
>> -
>> -	testdin = max_mbps_to_testdin(dsi->lane_mbps);
>> -	if (testdin < 0) {
>> -		DRM_DEV_ERROR(dsi->dev,
>> -			      "failed to get testdin for %dmbps lane clock\n",
>> -			      dsi->lane_mbps);
>> -		return testdin;
>> -	}
>> -
>> -	/* Start by clearing PHY state */
>> -	dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_UNTESTCLR);
>> -	dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_TESTCLR);
>> -	dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_UNTESTCLR);
>> -
>> -	ret = clk_prepare_enable(dsi->phy_cfg_clk);
>> -	if (ret) {
>> -		DRM_DEV_ERROR(dsi->dev, "Failed to enable phy_cfg_clk\n");
>> -		return ret;
>> -	}
>> -
>> -	dw_mipi_dsi_phy_write(dsi, 0x10, BYPASS_VCO_RANGE |
>> -					 VCO_RANGE_CON_SEL(vco) |
>> -					 VCO_IN_CAP_CON_LOW |
>> -					 REF_BIAS_CUR_SEL);
>> -
>> -	dw_mipi_dsi_phy_write(dsi, 0x11, CP_CURRENT_3MA);
>> -	dw_mipi_dsi_phy_write(dsi, 0x12, CP_PROGRAM_EN | LPF_PROGRAM_EN |
>> -					 LPF_RESISTORS_20_KOHM);
>> -
>> -	dw_mipi_dsi_phy_write(dsi, 0x44, HSFREQRANGE_SEL(testdin));
>> -
>> -	dw_mipi_dsi_phy_write(dsi, 0x17, INPUT_DIVIDER(dsi->input_div));
>> -	dw_mipi_dsi_phy_write(dsi, 0x18, LOOP_DIV_LOW_SEL(dsi->feedback_div) |
>> -					 LOW_PROGRAM_EN);
>> -	dw_mipi_dsi_phy_write(dsi, 0x18, LOOP_DIV_HIGH_SEL(dsi->feedback_div) |
>> -					 HIGH_PROGRAM_EN);
>> -	dw_mipi_dsi_phy_write(dsi, 0x19, PLL_LOOP_DIV_EN | PLL_INPUT_DIV_EN);
>> -
>> -	dw_mipi_dsi_phy_write(dsi, 0x22, LOW_PROGRAM_EN |
>> -					 BIASEXTR_SEL(BIASEXTR_127_7));
>> -	dw_mipi_dsi_phy_write(dsi, 0x22, HIGH_PROGRAM_EN |
>> -					 BANDGAP_SEL(BANDGAP_96_10));
>> -
>> -	dw_mipi_dsi_phy_write(dsi, 0x20, POWER_CONTROL | INTERNAL_REG_CURRENT |
>> -					 BIAS_BLOCK_ON | BANDGAP_ON);
>> -
>> -	dw_mipi_dsi_phy_write(dsi, 0x21, TER_RESISTOR_LOW | TER_CAL_DONE |
>> -					 SETRD_MAX | TER_RESISTORS_ON);
>> -	dw_mipi_dsi_phy_write(dsi, 0x21, TER_RESISTOR_HIGH | LEVEL_SHIFTERS_ON |
>> -					 SETRD_MAX | POWER_MANAGE |
>> -					 TER_RESISTORS_ON);
>> -
>> -	dw_mipi_dsi_phy_write(dsi, 0x60, TLP_PROGRAM_EN | ns2bc(dsi, 500));
>> -	dw_mipi_dsi_phy_write(dsi, 0x61, THS_PRE_PROGRAM_EN | ns2ui(dsi, 40));
>> -	dw_mipi_dsi_phy_write(dsi, 0x62, THS_ZERO_PROGRAM_EN | ns2bc(dsi, 300));
>> -	dw_mipi_dsi_phy_write(dsi, 0x63, THS_PRE_PROGRAM_EN | ns2ui(dsi, 100));
>> -	dw_mipi_dsi_phy_write(dsi, 0x64, BIT(5) | ns2bc(dsi, 100));
>> -	dw_mipi_dsi_phy_write(dsi, 0x65, BIT(5) | (ns2bc(dsi, 60) + 7));
>> -
>> -	dw_mipi_dsi_phy_write(dsi, 0x70, TLP_PROGRAM_EN | ns2bc(dsi, 500));
>> -	dw_mipi_dsi_phy_write(dsi, 0x71,
>> -			      THS_PRE_PROGRAM_EN | (ns2ui(dsi, 50) + 5));
>> -	dw_mipi_dsi_phy_write(dsi, 0x72,
>> -			      THS_ZERO_PROGRAM_EN | (ns2bc(dsi, 140) + 2));
>> -	dw_mipi_dsi_phy_write(dsi, 0x73,
>> -			      THS_PRE_PROGRAM_EN | (ns2ui(dsi, 60) + 8));
>> -	dw_mipi_dsi_phy_write(dsi, 0x74, BIT(5) | ns2bc(dsi, 100));
>> -
>> -	dsi_write(dsi, DSI_PHY_RSTZ, PHY_ENFORCEPLL | PHY_ENABLECLK |
>> -				     PHY_UNRSTZ | PHY_UNSHUTDOWNZ);
>> -
>> -	ret = readl_poll_timeout(dsi->base + DSI_PHY_STATUS,
>> -				 val, val & LOCK, 1000, PHY_STATUS_TIMEOUT_US);
>> -	if (ret < 0) {
>> -		DRM_DEV_ERROR(dsi->dev, "failed to wait for phy lock state\n");
>> -		goto phy_init_end;
>> -	}
>> -
>> -	ret = readl_poll_timeout(dsi->base + DSI_PHY_STATUS,
>> -				 val, val & STOP_STATE_CLK_LANE, 1000,
>> -				 PHY_STATUS_TIMEOUT_US);
>> -	if (ret < 0)
>> -		DRM_DEV_ERROR(dsi->dev,
>> -			      "failed to wait for phy clk lane stop state\n");
>> -
>> -phy_init_end:
>> -	clk_disable_unprepare(dsi->phy_cfg_clk);
>> -
>> -	return ret;
>> -}
>> -
>> -static int dw_mipi_dsi_get_lane_bps(struct dw_mipi_dsi *dsi,
>> -				    struct drm_display_mode *mode)
>> -{
>> -	unsigned int i, pre;
>> -	unsigned long mpclk, pllref, tmp;
>> -	unsigned int m = 1, n = 1, target_mbps = 1000;
>> -	unsigned int max_mbps = dptdin_map[ARRAY_SIZE(dptdin_map) - 1].max_mbps;
>> -	int bpp;
>> -
>> -	bpp = mipi_dsi_pixel_format_to_bpp(dsi->format);
>> -	if (bpp < 0) {
>> -		DRM_DEV_ERROR(dsi->dev,
>> -			      "failed to get bpp for pixel format %d\n",
>> -			      dsi->format);
>> -		return bpp;
>> -	}
>> -
>> -	mpclk = DIV_ROUND_UP(mode->clock, MSEC_PER_SEC);
>> -	if (mpclk) {
>> -		/* take 1 / 0.8, since mbps must big than bandwidth of RGB */
>> -		tmp = mpclk * (bpp / dsi->lanes) * 10 / 8;
>> -		if (tmp < max_mbps)
>> -			target_mbps = tmp;
>> -		else
>> -			DRM_DEV_ERROR(dsi->dev,
>> -				      "DPHY clock frequency is out of range\n");
>> -	}
>> -
>> -	pllref = DIV_ROUND_UP(clk_get_rate(dsi->pllref_clk), USEC_PER_SEC);
>> -	tmp = pllref;
>> -
>> -	/*
>> -	 * The limits on the PLL divisor are:
>> -	 *
>> -	 *	5MHz <= (pllref / n) <= 40MHz
>> -	 *
>> -	 * we walk over these values in descreasing order so that if we hit
>> -	 * an exact match for target_mbps it is more likely that "m" will be
>> -	 * even.
>> -	 *
>> -	 * TODO: ensure that "m" is even after this loop.
>> -	 */
>> -	for (i = pllref / 5; i > (pllref / 40); i--) {
>> -		pre = pllref / i;
>> -		if ((tmp > (target_mbps % pre)) && (target_mbps / pre < 512)) {
>> -			tmp = target_mbps % pre;
>> -			n = i;
>> -			m = target_mbps / pre;
>> -		}
>> -		if (tmp == 0)
>> -			break;
>> -	}
>> -
>> -	dsi->lane_mbps = pllref / n * m;
>> -	dsi->input_div = n;
>> -	dsi->feedback_div = m;
>> -
>> -	return 0;
>> -}
>> -
>> -static int dw_mipi_dsi_host_attach(struct mipi_dsi_host *host,
>> -				   struct mipi_dsi_device *device)
>> -{
>> -	struct dw_mipi_dsi *dsi = host_to_dsi(host);
>> -
>> -	if (device->lanes > dsi->pdata->max_data_lanes) {
>> -		DRM_DEV_ERROR(dsi->dev,
>> -			      "the number of data lanes(%u) is too many\n",
>> -			      device->lanes);
>> -		return -EINVAL;
>> -	}
>> -
>> -	dsi->lanes = device->lanes;
>> -	dsi->channel = device->channel;
>> -	dsi->format = device->format;
>> -	dsi->mode_flags = device->mode_flags;
>> -	dsi->panel = of_drm_find_panel(device->dev.of_node);
>> -	if (dsi->panel)
>> -		return drm_panel_attach(dsi->panel, &dsi->connector);
>> -
>> -	return -EINVAL;
>> -}
>> -
>> -static int dw_mipi_dsi_host_detach(struct mipi_dsi_host *host,
>> -				   struct mipi_dsi_device *device)
>> -{
>> -	struct dw_mipi_dsi *dsi = host_to_dsi(host);
>> -
>> -	drm_panel_detach(dsi->panel);
>> -
>> -	return 0;
>> -}
>> -
>> -static void dw_mipi_message_config(struct dw_mipi_dsi *dsi,
>> -				   const struct mipi_dsi_msg *msg)
>> -{
>> -	bool lpm = msg->flags & MIPI_DSI_MSG_USE_LPM;
>> -	u32 val = 0;
>> -
>> -	if (msg->flags & MIPI_DSI_MSG_REQ_ACK)
>> -		val |= EN_ACK_RQST;
>> -	if (lpm)
>> -		val |= CMD_MODE_ALL_LP;
>> -
>> -	dsi_write(dsi, DSI_LPCLK_CTRL, lpm ? 0 : PHY_TXREQUESTCLKHS);
>> -	dsi_write(dsi, DSI_CMD_MODE_CFG, val);
>> -}
>> -
>> -static int dw_mipi_dsi_gen_pkt_hdr_write(struct dw_mipi_dsi *dsi, u32 hdr_val)
>> -{
>> -	int ret;
>> -	u32 val, mask;
>> -
>> -	ret = readl_poll_timeout(dsi->base + DSI_CMD_PKT_STATUS,
>> -				 val, !(val & GEN_CMD_FULL), 1000,
>> -				 CMD_PKT_STATUS_TIMEOUT_US);
>> -	if (ret < 0) {
>> -		DRM_DEV_ERROR(dsi->dev,
>> -			      "failed to get available command FIFO\n");
>> -		return ret;
>> -	}
>> -
>> -	dsi_write(dsi, DSI_GEN_HDR, hdr_val);
>> -
>> -	mask = GEN_CMD_EMPTY | GEN_PLD_W_EMPTY;
>> -	ret = readl_poll_timeout(dsi->base + DSI_CMD_PKT_STATUS,
>> -				 val, (val & mask) == mask,
>> -				 1000, CMD_PKT_STATUS_TIMEOUT_US);
>> -	if (ret < 0) {
>> -		DRM_DEV_ERROR(dsi->dev, "failed to write command FIFO\n");
>> -		return ret;
>> -	}
>> -
>> -	return 0;
>> -}
>> -
>> -static int dw_mipi_dsi_dcs_short_write(struct dw_mipi_dsi *dsi,
>> -				       const struct mipi_dsi_msg *msg)
>> -{
>> -	const u8 *tx_buf = msg->tx_buf;
>> -	u16 data = 0;
>> -	u32 val;
>> -
>> -	if (msg->tx_len > 0)
>> -		data |= tx_buf[0];
>> -	if (msg->tx_len > 1)
>> -		data |= tx_buf[1] << 8;
>> -
>> -	if (msg->tx_len > 2) {
>> -		DRM_DEV_ERROR(dsi->dev,
>> -			      "too long tx buf length %zu for short write\n",
>> -			      msg->tx_len);
>> -		return -EINVAL;
>> -	}
>> -
>> -	val = GEN_HDATA(data) | GEN_HTYPE(msg->type);
>> -	return dw_mipi_dsi_gen_pkt_hdr_write(dsi, val);
>> -}
>> -
>> -static int dw_mipi_dsi_dcs_long_write(struct dw_mipi_dsi *dsi,
>> -				      const struct mipi_dsi_msg *msg)
>> -{
>> -	const u8 *tx_buf = msg->tx_buf;
>> -	int len = msg->tx_len, pld_data_bytes = sizeof(u32), ret;
>> -	u32 hdr_val = GEN_HDATA(msg->tx_len) | GEN_HTYPE(msg->type);
>> -	u32 remainder;
>> -	u32 val;
>> -
>> -	if (msg->tx_len < 3) {
>> -		DRM_DEV_ERROR(dsi->dev,
>> -			      "wrong tx buf length %zu for long write\n",
>> -			      msg->tx_len);
>> -		return -EINVAL;
>> -	}
>> -
>> -	while (DIV_ROUND_UP(len, pld_data_bytes)) {
>> -		if (len < pld_data_bytes) {
>> -			remainder = 0;
>> -			memcpy(&remainder, tx_buf, len);
>> -			dsi_write(dsi, DSI_GEN_PLD_DATA, remainder);
>> -			len = 0;
>> -		} else {
>> -			memcpy(&remainder, tx_buf, pld_data_bytes);
>> -			dsi_write(dsi, DSI_GEN_PLD_DATA, remainder);
>> -			tx_buf += pld_data_bytes;
>> -			len -= pld_data_bytes;
>> -		}
>> -
>> -		ret = readl_poll_timeout(dsi->base + DSI_CMD_PKT_STATUS,
>> -					 val, !(val & GEN_PLD_W_FULL), 1000,
>> -					 CMD_PKT_STATUS_TIMEOUT_US);
>> -		if (ret < 0) {
>> -			DRM_DEV_ERROR(dsi->dev,
>> -				      "failed to get available write payload FIFO\n");
>> -			return ret;
>> -		}
>> -	}
>> -
>> -	return dw_mipi_dsi_gen_pkt_hdr_write(dsi, hdr_val);
>> -}
>> -
>> -static ssize_t dw_mipi_dsi_host_transfer(struct mipi_dsi_host *host,
>> -					 const struct mipi_dsi_msg *msg)
>> -{
>> -	struct dw_mipi_dsi *dsi = host_to_dsi(host);
>> -	int ret;
>> -
>> -	dw_mipi_message_config(dsi, msg);
>> -
>> -	switch (msg->type) {
>> -	case MIPI_DSI_DCS_SHORT_WRITE:
>> -	case MIPI_DSI_DCS_SHORT_WRITE_PARAM:
>> -	case MIPI_DSI_SET_MAXIMUM_RETURN_PACKET_SIZE:
>> -		ret = dw_mipi_dsi_dcs_short_write(dsi, msg);
>> -		break;
>> -	case MIPI_DSI_DCS_LONG_WRITE:
>> -		ret = dw_mipi_dsi_dcs_long_write(dsi, msg);
>> -		break;
>> -	default:
>> -		DRM_DEV_ERROR(dsi->dev, "unsupported message type 0x%02x\n",
>> -			      msg->type);
>> -		ret = -EINVAL;
>> -	}
>> -
>> -	return ret;
>> -}
>> -
>> -static const struct mipi_dsi_host_ops dw_mipi_dsi_host_ops = {
>> -	.attach = dw_mipi_dsi_host_attach,
>> -	.detach = dw_mipi_dsi_host_detach,
>> -	.transfer = dw_mipi_dsi_host_transfer,
>> -};
>> -
>> -static void dw_mipi_dsi_video_mode_config(struct dw_mipi_dsi *dsi)
>> -{
>> -	u32 val;
>> -
>> -	val = ENABLE_LOW_POWER;
>> -
>> -	if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST)
>> -		val |= VID_MODE_TYPE_BURST;
>> -	else if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE)
>> -		val |= VID_MODE_TYPE_NON_BURST_SYNC_PULSES;
>> -	else
>> -		val |= VID_MODE_TYPE_NON_BURST_SYNC_EVENTS;
>> -
>> -	dsi_write(dsi, DSI_VID_MODE_CFG, val);
>> -}
>> -
>> -static void dw_mipi_dsi_set_mode(struct dw_mipi_dsi *dsi,
>> -				 enum dw_mipi_dsi_mode mode)
>> -{
>> -	if (mode == DW_MIPI_DSI_CMD_MODE) {
>> -		dsi_write(dsi, DSI_PWR_UP, RESET);
>> -		dsi_write(dsi, DSI_MODE_CFG, ENABLE_CMD_MODE);
>> -		dsi_write(dsi, DSI_PWR_UP, POWERUP);
>> -	} else {
>> -		dsi_write(dsi, DSI_PWR_UP, RESET);
>> -		dsi_write(dsi, DSI_MODE_CFG, ENABLE_VIDEO_MODE);
>> -		dw_mipi_dsi_video_mode_config(dsi);
>> -		dsi_write(dsi, DSI_LPCLK_CTRL, PHY_TXREQUESTCLKHS);
>> -		dsi_write(dsi, DSI_PWR_UP, POWERUP);
>> -	}
>> -}
>> -
>> -static void dw_mipi_dsi_disable(struct dw_mipi_dsi *dsi)
>> -{
>> -	dsi_write(dsi, DSI_PWR_UP, RESET);
>> -	dsi_write(dsi, DSI_PHY_RSTZ, PHY_RSTZ);
>> -}
>> -
>> -static void dw_mipi_dsi_init(struct dw_mipi_dsi *dsi)
>> -{
>> -	/*
>> -	 * The maximum permitted escape clock is 20MHz and it is derived from
>> -	 * lanebyteclk, which is running at "lane_mbps / 8".  Thus we want:
>> -	 *
>> -	 *     (lane_mbps >> 3) / esc_clk_division < 20
>> -	 * which is:
>> -	 *     (lane_mbps >> 3) / 20 > esc_clk_division
>> -	 */
>> -	u32 esc_clk_division = (dsi->lane_mbps >> 3) / 20 + 1;
>> -
>> -	dsi_write(dsi, DSI_PWR_UP, RESET);
>> -	dsi_write(dsi, DSI_PHY_RSTZ, PHY_DISFORCEPLL | PHY_DISABLECLK
>> -		  | PHY_RSTZ | PHY_SHUTDOWNZ);
>> -	dsi_write(dsi, DSI_CLKMGR_CFG, TO_CLK_DIVIDSION(10) |
>> -		  TX_ESC_CLK_DIVIDSION(esc_clk_division));
>> -}
>> -
>> -static void dw_mipi_dsi_dpi_config(struct dw_mipi_dsi *dsi,
>> -				   struct drm_display_mode *mode)
>> -{
>> -	u32 val = 0, color = 0;
>> -
>> -	switch (dsi->format) {
>> -	case MIPI_DSI_FMT_RGB888:
>> -		color = DPI_COLOR_CODING_24BIT;
>> -		break;
>> -	case MIPI_DSI_FMT_RGB666:
>> -		color = DPI_COLOR_CODING_18BIT_2 | EN18_LOOSELY;
>> -		break;
>> -	case MIPI_DSI_FMT_RGB666_PACKED:
>> -		color = DPI_COLOR_CODING_18BIT_1;
>> -		break;
>> -	case MIPI_DSI_FMT_RGB565:
>> -		color = DPI_COLOR_CODING_16BIT_1;
>> -		break;
>> -	}
>> -
>> -	if (mode->flags & DRM_MODE_FLAG_NVSYNC)
>> -		val |= VSYNC_ACTIVE_LOW;
>> -	if (mode->flags & DRM_MODE_FLAG_NHSYNC)
>> -		val |= HSYNC_ACTIVE_LOW;
>> -
>> -	dsi_write(dsi, DSI_DPI_VCID, DPI_VID(dsi->channel));
>> -	dsi_write(dsi, DSI_DPI_COLOR_CODING, color);
>> -	dsi_write(dsi, DSI_DPI_CFG_POL, val);
>> -	dsi_write(dsi, DSI_DPI_LP_CMD_TIM, OUTVACT_LPCMD_TIME(4)
>> -		  | INVACT_LPCMD_TIME(4));
>> -}
>> -
>> -static void dw_mipi_dsi_packet_handler_config(struct dw_mipi_dsi *dsi)
>> -{
>> -	dsi_write(dsi, DSI_PCKHDL_CFG, EN_CRC_RX | EN_ECC_RX | EN_BTA);
>> -}
>> -
>> -static void dw_mipi_dsi_video_packet_config(struct dw_mipi_dsi *dsi,
>> -					    struct drm_display_mode *mode)
>> -{
>> -	dsi_write(dsi, DSI_VID_PKT_SIZE, VID_PKT_SIZE(mode->hdisplay));
>> -}
>> -
>> -static void dw_mipi_dsi_command_mode_config(struct dw_mipi_dsi *dsi)
>> -{
>> -	dsi_write(dsi, DSI_TO_CNT_CFG, HSTX_TO_CNT(1000) | LPRX_TO_CNT(1000));
>> -	dsi_write(dsi, DSI_BTA_TO_CNT, 0xd00);
>> -	dsi_write(dsi, DSI_MODE_CFG, ENABLE_CMD_MODE);
>> -}
>> -
>> -/* Get lane byte clock cycles. */
>> -static u32 dw_mipi_dsi_get_hcomponent_lbcc(struct dw_mipi_dsi *dsi,
>> -					   struct drm_display_mode *mode,
>> -					   u32 hcomponent)
>> -{
>> -	u32 frac, lbcc;
>> -
>> -	lbcc = hcomponent * dsi->lane_mbps * MSEC_PER_SEC / 8;
>> -
>> -	frac = lbcc % mode->clock;
>> -	lbcc = lbcc / mode->clock;
>> -	if (frac)
>> -		lbcc++;
>> -
>> -	return lbcc;
>> -}
>> -
>> -static void dw_mipi_dsi_line_timer_config(struct dw_mipi_dsi *dsi,
>> -					  struct drm_display_mode *mode)
>> -{
>> -	u32 htotal, hsa, hbp, lbcc;
>> -
>> -	htotal = mode->htotal;
>> -	hsa = mode->hsync_end - mode->hsync_start;
>> -	hbp = mode->htotal - mode->hsync_end;
>> -
>> -	lbcc = dw_mipi_dsi_get_hcomponent_lbcc(dsi, mode, htotal);
>> -	dsi_write(dsi, DSI_VID_HLINE_TIME, lbcc);
>> -
>> -	lbcc = dw_mipi_dsi_get_hcomponent_lbcc(dsi, mode, hsa);
>> -	dsi_write(dsi, DSI_VID_HSA_TIME, lbcc);
>> -
>> -	lbcc = dw_mipi_dsi_get_hcomponent_lbcc(dsi, mode, hbp);
>> -	dsi_write(dsi, DSI_VID_HBP_TIME, lbcc);
>> -}
>> -
>> -static void dw_mipi_dsi_vertical_timing_config(struct dw_mipi_dsi *dsi,
>> -					       struct drm_display_mode *mode)
>> -{
>> -	u32 vactive, vsa, vfp, vbp;
>> -
>> -	vactive = mode->vdisplay;
>> -	vsa = mode->vsync_end - mode->vsync_start;
>> -	vfp = mode->vsync_start - mode->vdisplay;
>> -	vbp = mode->vtotal - mode->vsync_end;
>> -
>> -	dsi_write(dsi, DSI_VID_VACTIVE_LINES, vactive);
>> -	dsi_write(dsi, DSI_VID_VSA_LINES, vsa);
>> -	dsi_write(dsi, DSI_VID_VFP_LINES, vfp);
>> -	dsi_write(dsi, DSI_VID_VBP_LINES, vbp);
>> -}
>> -
>> -static void dw_mipi_dsi_dphy_timing_config(struct dw_mipi_dsi *dsi)
>> -{
>> -	dsi_write(dsi, DSI_PHY_TMR_CFG, PHY_HS2LP_TIME(0x40)
>> -		  | PHY_LP2HS_TIME(0x40) | MAX_RD_TIME(10000));
>> -
>> -	dsi_write(dsi, DSI_PHY_TMR_LPCLK_CFG, PHY_CLKHS2LP_TIME(0x40)
>> -		  | PHY_CLKLP2HS_TIME(0x40));
>> -}
>> -
>> -static void dw_mipi_dsi_dphy_interface_config(struct dw_mipi_dsi *dsi)
>> -{
>> -	dsi_write(dsi, DSI_PHY_IF_CFG, PHY_STOP_WAIT_TIME(0x20) |
>> -		  N_LANES(dsi->lanes));
>> -}
>> -
>> -static void dw_mipi_dsi_clear_err(struct dw_mipi_dsi *dsi)
>> -{
>> -	dsi_read(dsi, DSI_INT_ST0);
>> -	dsi_read(dsi, DSI_INT_ST1);
>> -	dsi_write(dsi, DSI_INT_MSK0, 0);
>> -	dsi_write(dsi, DSI_INT_MSK1, 0);
>> -}
>> -
>> -static void dw_mipi_dsi_encoder_disable(struct drm_encoder *encoder)
>> -{
>> -	struct dw_mipi_dsi *dsi = encoder_to_dsi(encoder);
>> -
>> -	if (dsi->dpms_mode != DRM_MODE_DPMS_ON)
>> -		return;
>> -
>> -	if (clk_prepare_enable(dsi->pclk)) {
>> -		DRM_DEV_ERROR(dsi->dev, "Failed to enable pclk\n");
>> -		return;
>> -	}
>> -
>> -	drm_panel_disable(dsi->panel);
>> -
>> -	dw_mipi_dsi_set_mode(dsi, DW_MIPI_DSI_CMD_MODE);
>> -	drm_panel_unprepare(dsi->panel);
>> -
>> -	dw_mipi_dsi_disable(dsi);
>> -	pm_runtime_put(dsi->dev);
>> -	clk_disable_unprepare(dsi->pclk);
>> -	dsi->dpms_mode = DRM_MODE_DPMS_OFF;
>> -}
>> -
>> -static void dw_mipi_dsi_encoder_enable(struct drm_encoder *encoder)
>> -{
>> -	struct dw_mipi_dsi *dsi = encoder_to_dsi(encoder);
>> -	struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
>> -	const struct dw_mipi_dsi_plat_data *pdata = dsi->pdata;
>> -	int mux = drm_of_encoder_active_endpoint_id(dsi->dev->of_node, encoder);
>> -	u32 val;
>> -	int ret;
>> -
>> -	ret = dw_mipi_dsi_get_lane_bps(dsi, mode);
>> -	if (ret < 0)
>> -		return;
>> -
>> -	if (dsi->dpms_mode == DRM_MODE_DPMS_ON)
>> -		return;
>> -
>> -	if (clk_prepare_enable(dsi->pclk)) {
>> -		DRM_DEV_ERROR(dsi->dev, "Failed to enable pclk\n");
>> -		return;
>> -	}
>> -
>> -	pm_runtime_get_sync(dsi->dev);
>> -	dw_mipi_dsi_init(dsi);
>> -	dw_mipi_dsi_dpi_config(dsi, mode);
>> -	dw_mipi_dsi_packet_handler_config(dsi);
>> -	dw_mipi_dsi_video_mode_config(dsi);
>> -	dw_mipi_dsi_video_packet_config(dsi, mode);
>> -	dw_mipi_dsi_command_mode_config(dsi);
>> -	dw_mipi_dsi_line_timer_config(dsi, mode);
>> -	dw_mipi_dsi_vertical_timing_config(dsi, mode);
>> -	dw_mipi_dsi_dphy_timing_config(dsi);
>> -	dw_mipi_dsi_dphy_interface_config(dsi);
>> -	dw_mipi_dsi_clear_err(dsi);
>> -
>> -	/*
>> -	 * For the RK3399, the clk of grf must be enabled before writing grf
>> -	 * register. And for RK3288 or other soc, this grf_clk must be NULL,
>> -	 * the clk_prepare_enable return true directly.
>> -	 */
>> -	ret = clk_prepare_enable(dsi->grf_clk);
>> -	if (ret) {
>> -		DRM_DEV_ERROR(dsi->dev, "Failed to enable grf_clk: %d\n", ret);
>> -		return;
>> -	}
>> -
>> -	if (pdata->grf_dsi0_mode_reg)
>> -		regmap_write(dsi->grf_regmap, pdata->grf_dsi0_mode_reg,
>> -			     pdata->grf_dsi0_mode);
>> -
>> -	dw_mipi_dsi_phy_init(dsi);
>> -	dw_mipi_dsi_wait_for_two_frames(mode);
>> -
>> -	dw_mipi_dsi_set_mode(dsi, DW_MIPI_DSI_CMD_MODE);
>> -	if (drm_panel_prepare(dsi->panel))
>> -		DRM_DEV_ERROR(dsi->dev, "failed to prepare panel\n");
>> -
>> -	dw_mipi_dsi_set_mode(dsi, DW_MIPI_DSI_VID_MODE);
>> -	drm_panel_enable(dsi->panel);
>> -
>> -	clk_disable_unprepare(dsi->pclk);
>> -
>> -	if (mux)
>> -		val = pdata->dsi0_en_bit | (pdata->dsi0_en_bit << 16);
>> -	else
>> -		val = pdata->dsi0_en_bit << 16;
>> -
>> -	regmap_write(dsi->grf_regmap, pdata->grf_switch_reg, val);
>> -	DRM_DEV_DEBUG(dsi->dev,
>> -		      "vop %s output to dsi0\n", (mux) ? "LIT" : "BIG");
>> -	dsi->dpms_mode = DRM_MODE_DPMS_ON;
>> -
>> -	clk_disable_unprepare(dsi->grf_clk);
>> -}
>> -
>> -static int
>> -dw_mipi_dsi_encoder_atomic_check(struct drm_encoder *encoder,
>> -				 struct drm_crtc_state *crtc_state,
>> -				 struct drm_connector_state *conn_state)
>> -{
>> -	struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state);
>> -	struct dw_mipi_dsi *dsi = encoder_to_dsi(encoder);
>> -
>> -	switch (dsi->format) {
>> -	case MIPI_DSI_FMT_RGB888:
>> -		s->output_mode = ROCKCHIP_OUT_MODE_P888;
>> -		break;
>> -	case MIPI_DSI_FMT_RGB666:
>> -		s->output_mode = ROCKCHIP_OUT_MODE_P666;
>> -		break;
>> -	case MIPI_DSI_FMT_RGB565:
>> -		s->output_mode = ROCKCHIP_OUT_MODE_P565;
>> -		break;
>> -	default:
>> -		WARN_ON(1);
>> -		return -EINVAL;
>> -	}
>> -
>> -	s->output_type = DRM_MODE_CONNECTOR_DSI;
>> -
>> -	return 0;
>> -}
>> -
>> -static const struct drm_encoder_helper_funcs
>> -dw_mipi_dsi_encoder_helper_funcs = {
>> -	.enable = dw_mipi_dsi_encoder_enable,
>> -	.disable = dw_mipi_dsi_encoder_disable,
>> -	.atomic_check = dw_mipi_dsi_encoder_atomic_check,
>> -};
>> -
>> -static const struct drm_encoder_funcs dw_mipi_dsi_encoder_funcs = {
>> -	.destroy = drm_encoder_cleanup,
>> -};
>> -
>> -static int dw_mipi_dsi_connector_get_modes(struct drm_connector *connector)
>> -{
>> -	struct dw_mipi_dsi *dsi = con_to_dsi(connector);
>> -
>> -	return drm_panel_get_modes(dsi->panel);
>> -}
>> -
>> -static struct drm_connector_helper_funcs dw_mipi_dsi_connector_helper_funcs = {
>> -	.get_modes = dw_mipi_dsi_connector_get_modes,
>> -};
>> -
>> -static void dw_mipi_dsi_drm_connector_destroy(struct drm_connector *connector)
>> -{
>> -	drm_connector_unregister(connector);
>> -	drm_connector_cleanup(connector);
>> -}
>> -
>> -static const struct drm_connector_funcs dw_mipi_dsi_atomic_connector_funcs = {
>> -	.fill_modes = drm_helper_probe_single_connector_modes,
>> -	.destroy = dw_mipi_dsi_drm_connector_destroy,
>> -	.reset = drm_atomic_helper_connector_reset,
>> -	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
>> -	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
>> -};
>> -
>> -static int dw_mipi_dsi_register(struct drm_device *drm,
>> -				struct dw_mipi_dsi *dsi)
>> -{
>> -	struct drm_encoder *encoder = &dsi->encoder;
>> -	struct drm_connector *connector = &dsi->connector;
>> -	struct device *dev = dsi->dev;
>> -	int ret;
>> -
>> -	encoder->possible_crtcs = drm_of_find_possible_crtcs(drm,
>> -							     dev->of_node);
>> -	/*
>> -	 * If we failed to find the CRTC(s) which this encoder is
>> -	 * supposed to be connected to, it's because the CRTC has
>> -	 * not been registered yet.  Defer probing, and hope that
>> -	 * the required CRTC is added later.
>> -	 */
>> -	if (encoder->possible_crtcs == 0)
>> -		return -EPROBE_DEFER;
>> -
>> -	drm_encoder_helper_add(&dsi->encoder,
>> -			       &dw_mipi_dsi_encoder_helper_funcs);
>> -	ret = drm_encoder_init(drm, &dsi->encoder, &dw_mipi_dsi_encoder_funcs,
>> -			       DRM_MODE_ENCODER_DSI, NULL);
>> -	if (ret) {
>> -		DRM_DEV_ERROR(dev, "Failed to initialize encoder with drm\n");
>> -		return ret;
>> -	}
>> -
>> -	drm_connector_helper_add(connector,
>> -				 &dw_mipi_dsi_connector_helper_funcs);
>> -
>> -	drm_connector_init(drm, &dsi->connector,
>> -			   &dw_mipi_dsi_atomic_connector_funcs,
>> -			   DRM_MODE_CONNECTOR_DSI);
>> -
>> -	drm_mode_connector_attach_encoder(connector, encoder);
>> -
>> -	return 0;
>> -}
>> -
>> -static int rockchip_mipi_parse_dt(struct dw_mipi_dsi *dsi)
>> -{
>> -	struct device_node *np = dsi->dev->of_node;
>> -
>> -	dsi->grf_regmap = syscon_regmap_lookup_by_phandle(np, "rockchip,grf");
>> -	if (IS_ERR(dsi->grf_regmap)) {
>> -		DRM_DEV_ERROR(dsi->dev, "Unable to get rockchip,grf\n");
>> -		return PTR_ERR(dsi->grf_regmap);
>> -	}
>> -
>> -	return 0;
>> -}
>> -
>> -static struct dw_mipi_dsi_plat_data rk3288_mipi_dsi_drv_data = {
>> -	.dsi0_en_bit = RK3288_DSI0_SEL_VOP_LIT,
>> -	.dsi1_en_bit = RK3288_DSI1_SEL_VOP_LIT,
>> -	.grf_switch_reg = RK3288_GRF_SOC_CON6,
>> -	.max_data_lanes = 4,
>> -};
>> -
>> -static struct dw_mipi_dsi_plat_data rk3399_mipi_dsi_drv_data = {
>> -	.dsi0_en_bit = RK3399_DSI0_SEL_VOP_LIT,
>> -	.dsi1_en_bit = RK3399_DSI1_SEL_VOP_LIT,
>> -	.grf_switch_reg = RK3399_GRF_SOC_CON20,
>> -	.grf_dsi0_mode = RK3399_GRF_DSI_MODE,
>> -	.grf_dsi0_mode_reg = RK3399_GRF_SOC_CON22,
>> -	.flags = DW_MIPI_NEEDS_PHY_CFG_CLK | DW_MIPI_NEEDS_GRF_CLK,
>> -	.max_data_lanes = 4,
>> -};
>> -
>> -static const struct of_device_id dw_mipi_dsi_dt_ids[] = {
>> -	{
>> -	 .compatible = "rockchip,rk3288-mipi-dsi",
>> -	 .data = &rk3288_mipi_dsi_drv_data,
>> -	}, {
>> -	 .compatible = "rockchip,rk3399-mipi-dsi",
>> -	 .data = &rk3399_mipi_dsi_drv_data,
>> -	},
>> -	{ /* sentinel */ }
>> -};
>> -MODULE_DEVICE_TABLE(of, dw_mipi_dsi_dt_ids);
>> -
>> -static int dw_mipi_dsi_bind(struct device *dev, struct device *master,
>> -			    void *data)
>> -{
>> -	const struct of_device_id *of_id =
>> -			of_match_device(dw_mipi_dsi_dt_ids, dev);
>> -	const struct dw_mipi_dsi_plat_data *pdata = of_id->data;
>> -	struct platform_device *pdev = to_platform_device(dev);
>> -	struct reset_control *apb_rst;
>> -	struct drm_device *drm = data;
>> -	struct dw_mipi_dsi *dsi;
>> -	struct resource *res;
>> -	int ret;
>> -
>> -	dsi = devm_kzalloc(dev, sizeof(*dsi), GFP_KERNEL);
>> -	if (!dsi)
>> -		return -ENOMEM;
>> -
>> -	dsi->dev = dev;
>> -	dsi->pdata = pdata;
>> -	dsi->dpms_mode = DRM_MODE_DPMS_OFF;
>> -
>> -	ret = rockchip_mipi_parse_dt(dsi);
>> -	if (ret)
>> -		return ret;
>> -
>> -	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> -	if (!res)
>> -		return -ENODEV;
>> -
>> -	dsi->base = devm_ioremap_resource(dev, res);
>> -	if (IS_ERR(dsi->base))
>> -		return PTR_ERR(dsi->base);
>> -
>> -	dsi->pllref_clk = devm_clk_get(dev, "ref");
>> -	if (IS_ERR(dsi->pllref_clk)) {
>> -		ret = PTR_ERR(dsi->pllref_clk);
>> -		DRM_DEV_ERROR(dev,
>> -			      "Unable to get pll reference clock: %d\n", ret);
>> -		return ret;
>> -	}
>> -
>> -	dsi->pclk = devm_clk_get(dev, "pclk");
>> -	if (IS_ERR(dsi->pclk)) {
>> -		ret = PTR_ERR(dsi->pclk);
>> -		DRM_DEV_ERROR(dev, "Unable to get pclk: %d\n", ret);
>> -		return ret;
>> -	}
>> -
>> -	/*
>> -	 * Note that the reset was not defined in the initial device tree, so
>> -	 * we have to be prepared for it not being found.
>> -	 */
>> -	apb_rst = devm_reset_control_get(dev, "apb");
>> -	if (IS_ERR(apb_rst)) {
>> -		ret = PTR_ERR(apb_rst);
>> -		if (ret == -ENOENT) {
>> -			apb_rst = NULL;
>> -		} else {
>> -			DRM_DEV_ERROR(dev,
>> -				      "Unable to get reset control: %d\n", ret);
>> -			return ret;
>> -		}
>> -	}
>> -
>> -	if (apb_rst) {
>> -		ret = clk_prepare_enable(dsi->pclk);
>> -		if (ret) {
>> -			DRM_DEV_ERROR(dev, "Failed to enable pclk\n");
>> -			return ret;
>> -		}
>> -
>> -		reset_control_assert(apb_rst);
>> -		usleep_range(10, 20);
>> -		reset_control_deassert(apb_rst);
>> -
>> -		clk_disable_unprepare(dsi->pclk);
>> -	}
>> -
>> -	if (pdata->flags & DW_MIPI_NEEDS_PHY_CFG_CLK) {
>> -		dsi->phy_cfg_clk = devm_clk_get(dev, "phy_cfg");
>> -		if (IS_ERR(dsi->phy_cfg_clk)) {
>> -			ret = PTR_ERR(dsi->phy_cfg_clk);
>> -			DRM_DEV_ERROR(dev,
>> -				      "Unable to get phy_cfg_clk: %d\n", ret);
>> -			return ret;
>> -		}
>> -	}
>> -
>> -	if (pdata->flags & DW_MIPI_NEEDS_GRF_CLK) {
>> -		dsi->grf_clk = devm_clk_get(dev, "grf");
>> -		if (IS_ERR(dsi->grf_clk)) {
>> -			ret = PTR_ERR(dsi->grf_clk);
>> -			DRM_DEV_ERROR(dev, "Unable to get grf_clk: %d\n", ret);
>> -			return ret;
>> -		}
>> -	}
>> -
>> -	ret = clk_prepare_enable(dsi->pllref_clk);
>> -	if (ret) {
>> -		DRM_DEV_ERROR(dev, "Failed to enable pllref_clk\n");
>> -		return ret;
>> -	}
>> -
>> -	ret = dw_mipi_dsi_register(drm, dsi);
>> -	if (ret) {
>> -		DRM_DEV_ERROR(dev, "Failed to register mipi_dsi: %d\n", ret);
>> -		goto err_pllref;
>> -	}
>> -
>> -	pm_runtime_enable(dev);
>> -
>> -	dsi->dsi_host.ops = &dw_mipi_dsi_host_ops;
>> -	dsi->dsi_host.dev = dev;
>> -	ret = mipi_dsi_host_register(&dsi->dsi_host);
>> -	if (ret) {
>> -		DRM_DEV_ERROR(dev, "Failed to register MIPI host: %d\n", ret);
>> -		goto err_cleanup;
>> -	}
>> -
>> -	if (!dsi->panel) {
>> -		ret = -EPROBE_DEFER;
>> -		goto err_mipi_dsi_host;
>> -	}
>> -
>> -	dev_set_drvdata(dev, dsi);
>> -	return 0;
>> -
>> -err_mipi_dsi_host:
>> -	mipi_dsi_host_unregister(&dsi->dsi_host);
>> -err_cleanup:
>> -	drm_encoder_cleanup(&dsi->encoder);
>> -	drm_connector_cleanup(&dsi->connector);
>> -err_pllref:
>> -	clk_disable_unprepare(dsi->pllref_clk);
>> -	return ret;
>> -}
>> -
>> -static void dw_mipi_dsi_unbind(struct device *dev, struct device *master,
>> -			       void *data)
>> -{
>> -	struct dw_mipi_dsi *dsi = dev_get_drvdata(dev);
>> -
>> -	mipi_dsi_host_unregister(&dsi->dsi_host);
>> -	pm_runtime_disable(dev);
>> -	clk_disable_unprepare(dsi->pllref_clk);
>> -}
>> -
>> -static const struct component_ops dw_mipi_dsi_ops = {
>> -	.bind	= dw_mipi_dsi_bind,
>> -	.unbind	= dw_mipi_dsi_unbind,
>> -};
>> -
>> -static int dw_mipi_dsi_probe(struct platform_device *pdev)
>> -{
>> -	return component_add(&pdev->dev, &dw_mipi_dsi_ops);
>> -}
>> -
>> -static int dw_mipi_dsi_remove(struct platform_device *pdev)
>> -{
>> -	component_del(&pdev->dev, &dw_mipi_dsi_ops);
>> -	return 0;
>> -}
>> -
>> -struct platform_driver dw_mipi_dsi_driver = {
>> -	.probe		= dw_mipi_dsi_probe,
>> -	.remove		= dw_mipi_dsi_remove,
>> -	.driver		= {
>> -		.of_match_table = dw_mipi_dsi_dt_ids,
>> -		.name	= DRIVER_NAME,
>> -	},
>> -};
>> diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi_rockchip.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi_rockchip.c
>> new file mode 100644
>> index 0000000..c682ed2
>> --- /dev/null
>> +++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi_rockchip.c
>> @@ -0,0 +1,764 @@
>> +/*
>> + * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
>> + * Author:
>> + *      Chris Zhong <zyw@...k-chips.com>
>> + *      Nickey Yang <nickey.yang@...k-chips.com>
>> + *
>> + * This software is licensed under the terms of the GNU General Public
>> + * License version 2, as published by the Free Software Foundation, and
>> + * may be copied, distributed, and modified under those terms.
>> + *
>> + * 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.
>> + *
>> + * License terms:  GNU General Public License (GPL), version 2
>> + */
>> +
>> +#include <linux/clk.h>
>> +#include <linux/iopoll.h>
>> +#include <linux/math64.h>
>> +#include <linux/module.h>
>> +#include <linux/of_device.h>
>> +#include <drm/drmP.h>
>> +#include <drm/drm_mipi_dsi.h>
>> +#include <drm/bridge/dw_mipi_dsi.h>
>> +#include <video/mipi_display.h>
>> +#include <linux/regmap.h>
>> +#include <drm/drm_of.h>
>> +#include <linux/mfd/syscon.h>
>> +
>> +#include "rockchip_drm_drv.h"
>> +#include "rockchip_drm_vop.h"
>> +
>> +#define DSI_PHY_TST_CTRL0		0xb4
>> +#define PHY_TESTCLK			BIT(1)
>> +#define PHY_UNTESTCLK			0
>> +#define PHY_TESTCLR			BIT(0)
>> +#define PHY_UNTESTCLR			0
>> +
>> +#define DSI_PHY_TST_CTRL1		0xb8
>> +#define PHY_TESTEN			BIT(16)
>> +#define PHY_UNTESTEN			0
>> +#define PHY_TESTDOUT(n)			(((n) & 0xff) << 8)
>> +#define PHY_TESTDIN(n)			(((n) & 0xff) << 0)
>> +
>> +#define BYPASS_VCO_RANGE	BIT(7)
>> +#define VCO_RANGE_CON_SEL(val)	(((val) & 0x7) << 3)
>> +#define VCO_IN_CAP_CON_DEFAULT	(0x0 << 1)
>> +#define VCO_IN_CAP_CON_LOW	(0x1 << 1)
>> +#define VCO_IN_CAP_CON_HIGH	(0x2 << 1)
>> +#define REF_BIAS_CUR_SEL	BIT(0)
>> +
>> +#define CP_CURRENT_3UA	0x1
>> +#define CP_CURRENT_4_5UA	0x2
>> +#define CP_CURRENT_7_5UA	0x6
>> +#define CP_CURRENT_6UA	0x9
>> +#define CP_CURRENT_12UA	0xb
>> +#define CP_CURRENT_SEL(val)	((val) & 0xf)
>> +#define CP_PROGRAM_EN		BIT(7)
>> +
>> +#define LPF_RESISTORS_15_5KOHM	0x1
>> +#define LPF_RESISTORS_13KOHM	0x2
>> +#define LPF_RESISTORS_11_5KOHM	0x4
>> +#define LPF_RESISTORS_10_5KOHM	0x8
>> +#define LPF_RESISTORS_8KOHM	0x10
>> +#define LPF_PROGRAM_EN		BIT(6)
>> +#define LPF_RESISTORS_SEL(val)	((val) & 0x3f)
>> +
>> +#define HSFREQRANGE_SEL(val)	(((val) & 0x3f) << 1)
>> +
>> +#define INPUT_DIVIDER(val)	(((val) - 1) & 0x7f)
>> +#define LOW_PROGRAM_EN		0
>> +#define HIGH_PROGRAM_EN		BIT(7)
>> +#define LOOP_DIV_LOW_SEL(val)	(((val) - 1) & 0x1f)
>> +#define LOOP_DIV_HIGH_SEL(val)	((((val) - 1) >> 5) & 0xf)
>> +#define PLL_LOOP_DIV_EN		BIT(5)
>> +#define PLL_INPUT_DIV_EN	BIT(4)
>> +
>> +#define POWER_CONTROL		BIT(6)
>> +#define INTERNAL_REG_CURRENT	BIT(3)
>> +#define BIAS_BLOCK_ON		BIT(2)
>> +#define BANDGAP_ON		BIT(0)
>> +
>> +#define TER_RESISTOR_HIGH	BIT(7)
>> +#define	TER_RESISTOR_LOW	0
>> +#define LEVEL_SHIFTERS_ON	BIT(6)
>> +#define TER_CAL_DONE		BIT(5)
>> +#define SETRD_MAX		(0x7 << 2)
>> +#define POWER_MANAGE		BIT(1)
>> +#define TER_RESISTORS_ON	BIT(0)
>> +
>> +#define BIASEXTR_SEL(val)	((val) & 0x7)
>> +#define BANDGAP_SEL(val)	((val) & 0x7)
>> +#define TLP_PROGRAM_EN		BIT(7)
>> +#define THS_PRE_PROGRAM_EN	BIT(7)
>> +#define THS_ZERO_PROGRAM_EN	BIT(6)
>> +
>> +#define PLL_BIAS_CUR_SEL_CAP_VCO_CONTROL	0x10
>> +#define PLL_CP_CONTROL_PLL_LOCK_BYPASS	0x11
>> +#define PLL_LPF_AND_CP_CONTROL	0x12
>> +#define PLL_INPUT_DIVIDER_RATIO	0x17
>> +#define PLL_LOOP_DIVIDER_RATIO	0x18
>> +#define PLL_INPUT_AND_LOOP_DIVIDER_RATIOS_CONTROL	0x19
>> +#define BANDGAP_AND_BIAS_CONTROL	0x20
>> +#define TERMINATION_RESISTER_CONTROL	0x21
>> +#define AFE_BIAS_BANDGAP_ANALOG_PROGRAMMABILITY	0x22
>> +#define HS_RX_CONTROL_OF_LANE_0	0x44
>> +#define HS_TX_CLOCK_LANE_REQUEST_STATE_TIME_CONTROL	0x60
>> +#define HS_TX_CLOCK_LANE_PREPARE_STATE_TIME_CONTROL	0x61
>> +#define HS_TX_CLOCK_LANE_HS_ZERO_STATE_TIME_CONTROL	0x62
>> +#define HS_TX_CLOCK_LANE_TRAIL_STATE_TIME_CONTROL	0x63
>> +#define HS_TX_CLOCK_LANE_EXIT_STATE_TIME_CONTROL	0x64
>> +#define HS_TX_CLOCK_LANE_POST_TIME_CONTROL	0x65
>> +#define HS_TX_DATA_LANE_REQUEST_STATE_TIME_CONTROL	0x70
>> +#define HS_TX_DATA_LANE_PREPARE_STATE_TIME_CONTROL	0x71
>> +#define HS_TX_DATA_LANE_HS_ZERO_STATE_TIME_CONTROL	0x72
>> +#define HS_TX_DATA_LANE_TRAIL_STATE_TIME_CONTROL	0x73
>> +#define HS_TX_DATA_LANE_EXIT_STATE_TIME_CONTROL	0x74
>> +
>> +#define DW_MIPI_NEEDS_PHY_CFG_CLK	BIT(0)
>> +#define DW_MIPI_NEEDS_GRF_CLK		BIT(1)
>> +
>> +#define RK3288_GRF_SOC_CON6		0x025c
>> +#define RK3288_DSI0_SEL_VOP_LIT		BIT(6)
>> +#define RK3288_DSI1_SEL_VOP_LIT		BIT(9)
>> +
>> +#define RK3399_GRF_SOC_CON20		0x6250
>> +#define RK3399_DSI0_SEL_VOP_LIT		BIT(0)
>> +#define RK3399_DSI1_SEL_VOP_LIT		BIT(4)
>> +
>> +/* disable turnrequest, turndisable, forcetxstopmode, forcerxmode */
>> +#define RK3399_GRF_SOC_CON22		0x6258
>> +#define RK3399_GRF_DSI_MODE		0xffff0000
>> +
>> +#define to_dsi(nm)	container_of(nm, struct dw_mipi_dsi_rockchip, nm)
>> +
>> +enum {
>> +	BANDGAP_97_07,
>> +	BANDGAP_98_05,
>> +	BANDGAP_99_02,
>> +	BANDGAP_100_00,
>> +	BANDGAP_93_17,
>> +	BANDGAP_94_15,
>> +	BANDGAP_95_12,
>> +	BANDGAP_96_10,
>> +};
>> +
>> +enum {
>> +	BIASEXTR_87_1,
>> +	BIASEXTR_91_5,
>> +	BIASEXTR_95_9,
>> +	BIASEXTR_100,
>> +	BIASEXTR_105_94,
>> +	BIASEXTR_111_88,
>> +	BIASEXTR_118_8,
>> +	BIASEXTR_127_7,
>> +};
>> +
>> +struct rockchip_dw_dsi_chip_data {
>> +	u32 dsi0_en_bit;
>> +	u32 dsi1_en_bit;
>> +	u32 grf_switch_reg;
>> +	u32 grf_dsi0_mode;
>> +	u32 grf_dsi0_mode_reg;
>> +	unsigned int flags;
>> +	unsigned int max_data_lanes;
>> +};
>> +
>> +struct dw_mipi_dsi_rockchip {
>> +	struct device *dev;
>> +	struct drm_encoder encoder;
>> +	void __iomem *base;
>> +
>> +	struct regmap *grf_regmap;
>> +	struct clk *pllref_clk;
>> +	struct clk *grf_clk;
>> +	struct clk *phy_cfg_clk;
>> +
>> +	unsigned int lane_mbps; /* per lane */
>> +	u16 input_div;
>> +	u16 feedback_div;
>> +	u32 format;
>> +
>> +	struct dw_mipi_dsi *dmd;
>> +	const struct rockchip_dw_dsi_chip_data *cdata;
>> +	struct dw_mipi_dsi_plat_data pdata;
>> +};
>> +
>> +struct dphy_pll_parameter_map {
>> +	unsigned int max_mbps;
>> +	u8 hsfreqrange;
>> +	u8 icpctrl;
>> +	u8 lpfctrl;
>> +};
>> +
>> +/* The table is based on 27MHz DPHY pll reference clock. */
>> +static const struct dphy_pll_parameter_map dppa_map[] = {
>> +	{  89, 0x00, CP_CURRENT_3UA, LPF_RESISTORS_13KOHM },
>> +	{  99, 0x10, CP_CURRENT_3UA, LPF_RESISTORS_13KOHM },
>> +	{ 109, 0x20, CP_CURRENT_3UA, LPF_RESISTORS_13KOHM },
>> +	{ 129, 0x01, CP_CURRENT_3UA, LPF_RESISTORS_15_5KOHM },
>> +	{ 139, 0x11, CP_CURRENT_3UA, LPF_RESISTORS_15_5KOHM },
>> +	{ 149, 0x21, CP_CURRENT_3UA, LPF_RESISTORS_15_5KOHM },
>> +	{ 169, 0x02, CP_CURRENT_6UA, LPF_RESISTORS_13KOHM },
>> +	{ 179, 0x12, CP_CURRENT_6UA, LPF_RESISTORS_13KOHM },
>> +	{ 199, 0x22, CP_CURRENT_6UA, LPF_RESISTORS_13KOHM },
>> +	{ 219, 0x03, CP_CURRENT_4_5UA, LPF_RESISTORS_13KOHM },
>> +	{ 239, 0x13, CP_CURRENT_4_5UA, LPF_RESISTORS_13KOHM },
>> +	{ 249, 0x23, CP_CURRENT_4_5UA, LPF_RESISTORS_13KOHM },
>> +	{ 269, 0x04, CP_CURRENT_6UA, LPF_RESISTORS_11_5KOHM },
>> +	{ 299, 0x14, CP_CURRENT_6UA, LPF_RESISTORS_11_5KOHM },
>> +	{ 329, 0x05, CP_CURRENT_3UA, LPF_RESISTORS_15_5KOHM },
>> +	{ 359, 0x15, CP_CURRENT_3UA, LPF_RESISTORS_15_5KOHM },
>> +	{ 399, 0x25, CP_CURRENT_3UA, LPF_RESISTORS_15_5KOHM },
>> +	{ 449, 0x06, CP_CURRENT_7_5UA, LPF_RESISTORS_11_5KOHM },
>> +	{ 499, 0x16, CP_CURRENT_7_5UA, LPF_RESISTORS_11_5KOHM },
>> +	{ 549, 0x07, CP_CURRENT_7_5UA, LPF_RESISTORS_10_5KOHM },
>> +	{ 599, 0x17, CP_CURRENT_7_5UA, LPF_RESISTORS_10_5KOHM },
>> +	{ 649, 0x08, CP_CURRENT_7_5UA, LPF_RESISTORS_11_5KOHM },
>> +	{ 699, 0x18, CP_CURRENT_7_5UA, LPF_RESISTORS_11_5KOHM },
>> +	{ 749, 0x09, CP_CURRENT_7_5UA, LPF_RESISTORS_11_5KOHM },
>> +	{ 799, 0x19, CP_CURRENT_7_5UA, LPF_RESISTORS_11_5KOHM },
>> +	{ 849, 0x29, CP_CURRENT_7_5UA, LPF_RESISTORS_11_5KOHM },
>> +	{ 899, 0x39, CP_CURRENT_7_5UA, LPF_RESISTORS_11_5KOHM },
>> +	{ 949, 0x0a, CP_CURRENT_12UA, LPF_RESISTORS_8KOHM },
>> +	{ 999, 0x1a, CP_CURRENT_12UA, LPF_RESISTORS_8KOHM },
>> +	{1049, 0x2a, CP_CURRENT_12UA, LPF_RESISTORS_8KOHM },
>> +	{1099, 0x3a, CP_CURRENT_12UA, LPF_RESISTORS_8KOHM },
>> +	{1149, 0x0b, CP_CURRENT_12UA, LPF_RESISTORS_10_5KOHM },
>> +	{1199, 0x1b, CP_CURRENT_12UA, LPF_RESISTORS_10_5KOHM },
>> +	{1249, 0x2b, CP_CURRENT_12UA, LPF_RESISTORS_10_5KOHM },
>> +	{1299, 0x3b, CP_CURRENT_12UA, LPF_RESISTORS_10_5KOHM },
>> +	{1349, 0x0c, CP_CURRENT_12UA, LPF_RESISTORS_10_5KOHM },
>> +	{1399, 0x1c, CP_CURRENT_12UA, LPF_RESISTORS_10_5KOHM },
>> +	{1449, 0x2c, CP_CURRENT_12UA, LPF_RESISTORS_10_5KOHM },
>> +	{1500, 0x3c, CP_CURRENT_12UA, LPF_RESISTORS_10_5KOHM }
>> +};
>> +
>> +static int max_mbps_to_parameter(unsigned int max_mbps)
>> +{
>> +	int i;
>> +
>> +	for (i = 0; i < ARRAY_SIZE(dppa_map); i++)
>> +		if (dppa_map[i].max_mbps >= max_mbps)
>> +			return i;
>> +
>> +	return -EINVAL;
>> +}
>> +
>> +static inline void dsi_write(struct dw_mipi_dsi_rockchip *dsi, u32 reg, u32 val)
>> +{
>> +	writel(val, dsi->base + reg);
>> +}
>> +
>> +static inline u32 dsi_read(struct dw_mipi_dsi_rockchip *dsi, u32 reg)
>> +{
>> +	return readl(dsi->base + reg);
>> +}
>> +
>> +static inline void dsi_set(struct dw_mipi_dsi_rockchip *dsi, u32 reg, u32 mask)
>> +{
>> +	dsi_write(dsi, reg, dsi_read(dsi, reg) | mask);
>> +}
>> +
>> +static inline void dsi_update_bits(struct dw_mipi_dsi_rockchip *dsi, u32 reg,
>> +				   u32 mask, u32 val)
>> +{
>> +	dsi_write(dsi, reg, (dsi_read(dsi, reg) & ~mask) | val);
>> +}
>> +
>> +static void dw_mipi_dsi_phy_write(struct dw_mipi_dsi_rockchip *dsi,
>> +				  u8 test_code,
>> +				  u8 test_data)
>> +{
>> +	/*
>> +	 * With the falling edge on TESTCLK, the TESTDIN[7:0] signal content
>> +	 * is latched internally as the current test code. Test data is
>> +	 * programmed internally by rising edge on TESTCLK.
>> +	 */
>> +	dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_TESTCLK | PHY_UNTESTCLR);
>> +
>> +	dsi_write(dsi, DSI_PHY_TST_CTRL1, PHY_TESTEN | PHY_TESTDOUT(0) |
>> +					  PHY_TESTDIN(test_code));
>> +
>> +	dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_UNTESTCLK | PHY_UNTESTCLR);
>> +
>> +	dsi_write(dsi, DSI_PHY_TST_CTRL1, PHY_UNTESTEN | PHY_TESTDOUT(0) |
>> +					  PHY_TESTDIN(test_data));
>> +
>> +	dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_TESTCLK | PHY_UNTESTCLR);
>> +}
>> +
>> +/**
>> + * ns2bc - Nanoseconds to byte clock cycles
>> + */
>> +static inline unsigned int ns2bc(struct dw_mipi_dsi_rockchip *dsi, int ns)
>> +{
>> +	return DIV_ROUND_UP(ns * dsi->lane_mbps / 8, 1000);
>> +}
>> +
>> +/**
>> + * ns2ui - Nanoseconds to UI time periods
>> + */
>> +static inline unsigned int ns2ui(struct dw_mipi_dsi_rockchip *dsi, int ns)
>> +{
>> +	return DIV_ROUND_UP(ns * dsi->lane_mbps, 1000);
>> +}
>> +
>> +static int dw_mipi_dsi_phy_init(void *priv_data)
>> +{
>> +	struct dw_mipi_dsi_rockchip *dsi = priv_data;
>> +	int ret, i, vco;
>> +
>> +	vco = (dsi->lane_mbps < 200) ? 0 : (dsi->lane_mbps + 100) / 200;
> Please add a clarifying comment as requested by Sean on
> https://chromium-review.googlesource.com/#/c/chromiumos/third_party/kernel/+/780120/
Done in v4 version: https://patchwork.kernel.org/patch/10086125/
>> +	i = max_mbps_to_parameter(dsi->lane_mbps);
>> +	if (i < 0) {
>> +		DRM_DEV_ERROR(dsi->dev,
>> +			      "failed to get parameter for %dmbps clock\n",
>> +			      dsi->lane_mbps);
>> +		return i;
>> +	}
>> +
>> +	ret = clk_prepare_enable(dsi->phy_cfg_clk);
>> +	if (ret) {
>> +		DRM_DEV_ERROR(dsi->dev, "Failed to enable phy_cfg_clk\n");
>> +		return ret;
>> +	}
>> +
>> +	dw_mipi_dsi_phy_write(dsi, PLL_BIAS_CUR_SEL_CAP_VCO_CONTROL,
>> +			      BYPASS_VCO_RANGE |
>> +			      VCO_RANGE_CON_SEL(vco) |
>> +			      VCO_IN_CAP_CON_LOW |
>> +			      REF_BIAS_CUR_SEL);
>> +
>> +	dw_mipi_dsi_phy_write(dsi, PLL_CP_CONTROL_PLL_LOCK_BYPASS,
>> +			      CP_CURRENT_SEL(dppa_map[i].icpctrl));
>> +	dw_mipi_dsi_phy_write(dsi, PLL_LPF_AND_CP_CONTROL,
>> +			      CP_PROGRAM_EN | LPF_PROGRAM_EN |
>> +			      LPF_RESISTORS_SEL(dppa_map[i].lpfctrl));
>> +
>> +	dw_mipi_dsi_phy_write(dsi, HS_RX_CONTROL_OF_LANE_0,
>> +			      HSFREQRANGE_SEL(dppa_map[i].hsfreqrange));
>> +
>> +	dw_mipi_dsi_phy_write(dsi, PLL_INPUT_DIVIDER_RATIO,
>> +			      INPUT_DIVIDER(dsi->input_div));
>> +	dw_mipi_dsi_phy_write(dsi, PLL_LOOP_DIVIDER_RATIO,
>> +			      LOOP_DIV_LOW_SEL(dsi->feedback_div) |
>> +			      LOW_PROGRAM_EN);
>> +	/*
>> +	 * We need set PLL_INPUT_AND_LOOP_DIVIDER_RATIOS_CONTROL immediately
>> +	 * to make the configured LSB effective according to IP simulation
>> +	 * and lab test results.
>> +	 * Only in this way can we get correct mipi phy pll frequency.
>> +	 */
>> +	dw_mipi_dsi_phy_write(dsi, PLL_INPUT_AND_LOOP_DIVIDER_RATIOS_CONTROL,
>> +			      PLL_LOOP_DIV_EN | PLL_INPUT_DIV_EN);
>> +	dw_mipi_dsi_phy_write(dsi, PLL_LOOP_DIVIDER_RATIO,
>> +			      LOOP_DIV_HIGH_SEL(dsi->feedback_div) |
>> +			      HIGH_PROGRAM_EN);
>> +	dw_mipi_dsi_phy_write(dsi, PLL_INPUT_AND_LOOP_DIVIDER_RATIOS_CONTROL,
>> +			      PLL_LOOP_DIV_EN | PLL_INPUT_DIV_EN);
>> +
>> +	dw_mipi_dsi_phy_write(dsi, AFE_BIAS_BANDGAP_ANALOG_PROGRAMMABILITY,
>> +			      LOW_PROGRAM_EN | BIASEXTR_SEL(BIASEXTR_127_7));
>> +	dw_mipi_dsi_phy_write(dsi, AFE_BIAS_BANDGAP_ANALOG_PROGRAMMABILITY,
>> +			      HIGH_PROGRAM_EN | BANDGAP_SEL(BANDGAP_96_10));
>> +
>> +	dw_mipi_dsi_phy_write(dsi, BANDGAP_AND_BIAS_CONTROL,
>> +			      POWER_CONTROL | INTERNAL_REG_CURRENT |
>> +			      BIAS_BLOCK_ON | BANDGAP_ON);
>> +
>> +	dw_mipi_dsi_phy_write(dsi, TERMINATION_RESISTER_CONTROL,
>> +			      TER_RESISTOR_LOW | TER_CAL_DONE |
>> +			      SETRD_MAX | TER_RESISTORS_ON);
>> +	dw_mipi_dsi_phy_write(dsi, TERMINATION_RESISTER_CONTROL,
>> +			      TER_RESISTOR_HIGH | LEVEL_SHIFTERS_ON |
>> +			      SETRD_MAX | POWER_MANAGE |
>> +			      TER_RESISTORS_ON);
>> +
>> +	dw_mipi_dsi_phy_write(dsi, HS_TX_CLOCK_LANE_REQUEST_STATE_TIME_CONTROL,
>> +			      TLP_PROGRAM_EN | ns2bc(dsi, 500));
>> +	dw_mipi_dsi_phy_write(dsi, HS_TX_CLOCK_LANE_PREPARE_STATE_TIME_CONTROL,
>> +			      THS_PRE_PROGRAM_EN | ns2ui(dsi, 40));
>> +	dw_mipi_dsi_phy_write(dsi, HS_TX_CLOCK_LANE_HS_ZERO_STATE_TIME_CONTROL,
>> +			      THS_ZERO_PROGRAM_EN | ns2bc(dsi, 300));
>> +	dw_mipi_dsi_phy_write(dsi, HS_TX_CLOCK_LANE_TRAIL_STATE_TIME_CONTROL,
>> +			      THS_PRE_PROGRAM_EN | ns2ui(dsi, 100));
>> +	dw_mipi_dsi_phy_write(dsi, HS_TX_CLOCK_LANE_EXIT_STATE_TIME_CONTROL,
>> +			      BIT(5) | ns2bc(dsi, 100));
>> +	dw_mipi_dsi_phy_write(dsi, HS_TX_CLOCK_LANE_POST_TIME_CONTROL,
>> +			      BIT(5) | (ns2bc(dsi, 60) + 7));
>> +
>> +	dw_mipi_dsi_phy_write(dsi, HS_TX_DATA_LANE_REQUEST_STATE_TIME_CONTROL,
>> +			      TLP_PROGRAM_EN | ns2bc(dsi, 500));
>> +	dw_mipi_dsi_phy_write(dsi, HS_TX_DATA_LANE_PREPARE_STATE_TIME_CONTROL,
>> +			      THS_PRE_PROGRAM_EN | (ns2ui(dsi, 50) + 20));
>> +	dw_mipi_dsi_phy_write(dsi, HS_TX_DATA_LANE_HS_ZERO_STATE_TIME_CONTROL,
>> +			      THS_ZERO_PROGRAM_EN | (ns2bc(dsi, 140) + 2));
>> +	dw_mipi_dsi_phy_write(dsi, HS_TX_DATA_LANE_TRAIL_STATE_TIME_CONTROL,
>> +			      THS_PRE_PROGRAM_EN | (ns2ui(dsi, 60) + 8));
>> +	dw_mipi_dsi_phy_write(dsi, HS_TX_DATA_LANE_EXIT_STATE_TIME_CONTROL,
>> +			      BIT(5) | ns2bc(dsi, 100));
>> +
>> +	clk_disable_unprepare(dsi->phy_cfg_clk);
>> +
>> +	return ret;
>> +}
>> +
>> +static int
>> +dw_mipi_dsi_get_lane_mbps(void *priv_data, struct drm_display_mode *mode,
>> +			  unsigned long mode_flags, u32 lanes, u32 format,
>> +			  unsigned int *lane_mbps)
>> +{
>> +	struct dw_mipi_dsi_rockchip *dsi = priv_data;
>> +	int bpp;
>> +	unsigned long mpclk, tmp;
>> +	unsigned int target_mbps = 1000;
>> +	unsigned int max_mbps = dppa_map[ARRAY_SIZE(dppa_map) - 1].max_mbps;
>> +	unsigned long best_freq = 0;
>> +	unsigned long fvco_min, fvco_max, fin, fout;
>> +	unsigned int min_prediv, max_prediv;
>> +	unsigned int _prediv, uninitialized_var(best_prediv);
>> +	unsigned long _fbdiv, uninitialized_var(best_fbdiv);
>> +	unsigned long min_delta = ULONG_MAX;
>> +
>> +	dsi->format = format;
>> +	bpp = mipi_dsi_pixel_format_to_bpp(dsi->format);
>> +	if (bpp < 0) {
>> +		DRM_DEV_ERROR(dsi->dev,
>> +			      "failed to get bpp for pixel format %d\n",
>> +			      dsi->format);
>> +		return bpp;
>> +	}
>> +
>> +	mpclk = DIV_ROUND_UP(mode->clock, MSEC_PER_SEC);
>> +	if (mpclk) {
>> +		/* take 1 / 0.8, since mbps must big than bandwidth of RGB */
>> +		tmp = mpclk * (bpp / lanes) * 10 / 8;
>> +		if (tmp < max_mbps)
>> +			target_mbps = tmp;
>> +		else
>> +			DRM_DEV_ERROR(dsi->dev,
>> +				      "DPHY clock frequency is out of range\n");
>> +	}
>> +
>> +	fin = clk_get_rate(dsi->pllref_clk);
>> +	fout = target_mbps * USEC_PER_SEC;
>> +
>> +	/* constraint: 5Mhz <= Fref / N <= 40MHz */
>> +	min_prediv = DIV_ROUND_UP(fin, 40 * USEC_PER_SEC);
>> +	max_prediv = fin / (5 * USEC_PER_SEC);
>> +
>> +	/* constraint: 80MHz <= Fvco <= 1500Mhz */
>> +	fvco_min = 80 * USEC_PER_SEC;
>> +	fvco_max = 1500 * USEC_PER_SEC;
>> +
>> +	for (_prediv = min_prediv; _prediv <= max_prediv; _prediv++) {
>> +		u64 tmp;
>> +		u32 delta;
>> +		/* Fvco = Fref * M / N */
>> +		tmp = (u64)fout * _prediv;
>> +		do_div(tmp, fin);
>> +		_fbdiv = tmp;
>> +		/*
>> +		 * Due to the use of a "by 2 pre-scaler," the range of the
>> +		 * feedback multiplication value M is limited to even division
>> +		 * numbers, and m must be greater than 6, less than 512.
>> +		 */
> It seems this should be "not bigger than 512" or something similar.
Done
>
>> +		if (_fbdiv < 6 || _fbdiv > 512)
>> +			continue;
>> +
>> +		_fbdiv += _fbdiv % 2;
>> +
>> +		tmp = (u64)_fbdiv * fin;
>> +		do_div(tmp, _prediv);
> Should we bail out early if min_prediv == 0 due to some bogus
> configuration of pllref_clk?
We get min_prediv by DIV_ROUND_UP(fin, 40M)
Fin will be 24Mhz or 27Mhz only as phy document said.
min_prediv will be 1.So i think add
  /* if (min_prediv == 0) return ... */seems unnecessary.
>> +		if (tmp < fvco_min || tmp > fvco_max)
>> +			continue;
>> +
>> +		delta = abs(fout - tmp);
>> +		if (delta < min_delta) {
>> +			best_prediv = _prediv;
>> +			best_fbdiv = _fbdiv;
>> +			min_delta = delta;
>> +			best_freq = tmp;
>> +		}
>> +	}
>> +
>> +	if (best_freq) {
>> +		dsi->lane_mbps = DIV_ROUND_UP(best_freq, USEC_PER_SEC);
>> +		*lane_mbps = dsi->lane_mbps;
>> +		dsi->input_div = best_prediv;
>> +		dsi->feedback_div = best_fbdiv;
>> +	} else {
>> +		DRM_DEV_ERROR(dsi->dev, "Can not find best_freq for DPHY\n");
> return -1;
>
Done by return -EINVAL; as Brian and Sean suggested.

Thanks
Nickey.
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static const struct dw_mipi_dsi_phy_ops dw_mipi_dsi_rockchip_phy_ops = {
>> +	.init = dw_mipi_dsi_phy_init,
>> +	.get_lane_mbps = dw_mipi_dsi_get_lane_mbps,
>> +};
>> +
>> +static void dw_mipi_dsi_encoder_mode_set(struct drm_encoder *encoder,
>> +					 struct drm_display_mode *mode,
>> +					 struct drm_display_mode *adjusted)
>> +{
>> +	struct dw_mipi_dsi_rockchip *dsi = to_dsi(encoder);
>> +	const struct rockchip_dw_dsi_chip_data *cdata = dsi->cdata;
>> +	int val, ret, mux;
>> +
>> +	mux = drm_of_encoder_active_endpoint_id(dsi->dev->of_node,
>> +						&dsi->encoder);
>> +	if (mux < 0)
>> +		return;
>> +	/*
>> +	 * For the RK3399, the clk of grf must be enabled before writing grf
>> +	 * register. And for RK3288 or other soc, this grf_clk must be NULL,
>> +	 * the clk_prepare_enable return true directly.
>> +	 */
>> +	ret = clk_prepare_enable(dsi->grf_clk);
>> +	if (ret) {
>> +		DRM_DEV_ERROR(dsi->dev, "Failed to enable grf_clk: %d\n", ret);
>> +		return;
>> +	}
>> +
>> +	val = cdata->dsi0_en_bit << 16;
>> +	if (mux)
>> +		val |= cdata->dsi0_en_bit;
>> +	regmap_write(dsi->grf_regmap, cdata->grf_switch_reg, val);
>> +
>> +	if (cdata->grf_dsi0_mode_reg)
>> +		regmap_write(dsi->grf_regmap, cdata->grf_dsi0_mode_reg,
>> +			     cdata->grf_dsi0_mode);
>> +
>> +	clk_disable_unprepare(dsi->grf_clk);
>> +}
>> +
>> +static int
>> +dw_mipi_dsi_encoder_atomic_check(struct drm_encoder *encoder,
>> +				 struct drm_crtc_state *crtc_state,
>> +				 struct drm_connector_state *conn_state)
>> +{
>> +	struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state);
>> +	struct dw_mipi_dsi_rockchip *dsi = to_dsi(encoder);
>> +
>> +	switch (dsi->format) {
>> +	case MIPI_DSI_FMT_RGB888:
>> +		s->output_mode = ROCKCHIP_OUT_MODE_P888;
>> +		break;
>> +	case MIPI_DSI_FMT_RGB666:
>> +		s->output_mode = ROCKCHIP_OUT_MODE_P666;
>> +		break;
>> +	case MIPI_DSI_FMT_RGB565:
>> +		s->output_mode = ROCKCHIP_OUT_MODE_P565;
>> +		break;
>> +	default:
>> +		WARN_ON(1);
>> +		return -EINVAL;
>> +	}
>> +
>> +	s->output_type = DRM_MODE_CONNECTOR_DSI;
>> +
>> +	return 0;
>> +}
>> +
>> +static const struct drm_encoder_helper_funcs
>> +dw_mipi_dsi_encoder_helper_funcs = {
>> +	.mode_set = dw_mipi_dsi_encoder_mode_set,
>> +	.atomic_check = dw_mipi_dsi_encoder_atomic_check,
>> +};
>> +
>> +static const struct drm_encoder_funcs dw_mipi_dsi_encoder_funcs = {
>> +	.destroy = drm_encoder_cleanup,
>> +};
>> +
>> +static int rockchip_dsi_drm_create_encoder(struct dw_mipi_dsi_rockchip *dsi,
>> +					   struct drm_device *drm_dev)
>> +{
>> +	struct drm_encoder *encoder = &dsi->encoder;
>> +	int ret;
>> +
>> +	encoder->possible_crtcs = drm_of_find_possible_crtcs(drm_dev,
>> +							     dsi->dev->of_node);
>> +
>> +	ret = drm_encoder_init(drm_dev, encoder, &dw_mipi_dsi_encoder_funcs,
>> +			       DRM_MODE_ENCODER_DSI, NULL);
>> +	if (ret) {
>> +		DRM_ERROR("Failed to initialize encoder with drm\n");
>> +		return ret;
>> +	}
>> +
>> +	drm_encoder_helper_add(encoder, &dw_mipi_dsi_encoder_helper_funcs);
>> +
>> +	return 0;
>> +}
>> +
>> +static int dw_mipi_dsi_rockchip_bind(struct device *dev,
>> +				     struct device *master,
>> +				     void *data)
>> +{
>> +	struct dw_mipi_dsi_rockchip *dsi = dev_get_drvdata(dev);
>> +	struct platform_device *pdev = to_platform_device(dev);
>> +	struct drm_device *drm_dev = data;
>> +	int ret;
>> +
>> +	dsi->pdata.base = dsi->base;
>> +	dsi->pdata.max_data_lanes = dsi->cdata->max_data_lanes;
>> +	dsi->pdata.phy_ops = &dw_mipi_dsi_rockchip_phy_ops;
>> +	dsi->pdata.priv_data = dsi;
>> +
>> +	ret = clk_prepare_enable(dsi->pllref_clk);
>> +	if (ret) {
>> +		DRM_DEV_ERROR(dev,
>> +			      "%s: Failed to enable pllref_clk\n", __func__);
>> +		return ret;
>> +	}
>> +
>> +	ret = rockchip_dsi_drm_create_encoder(dsi, drm_dev);
>> +	if (ret) {
>> +		DRM_ERROR("Failed to create drm encoder\n");
>> +		goto err_pllref;
>> +	}
>> +
>> +	dsi->dmd = dw_mipi_dsi_bind(pdev, &dsi->encoder, &dsi->pdata);
>> +	if (IS_ERR(dsi->dmd)) {
>> +		DRM_ERROR("Failed to bind\n");
>> +		ret = PTR_ERR(dsi->dmd);
>> +		goto err_pllref;
>> +	}
>> +	return 0;
>> +
>> +err_pllref:
>> +	clk_disable_unprepare(dsi->pllref_clk);
>> +	return ret;
>> +}
>> +
>> +static void dw_mipi_dsi_rockchip_unbind(struct device *dev,
>> +					struct device *master,
>> +					void *data)
>> +{
>> +	struct dw_mipi_dsi_rockchip *dsi = dev_get_drvdata(dev);
>> +
>> +	dw_mipi_dsi_unbind(dsi->dmd);
>> +	clk_disable_unprepare(dsi->pllref_clk);
>> +}
>> +
>> +static const struct component_ops dw_mipi_dsi_rockchip_ops = {
>> +	.bind	= dw_mipi_dsi_rockchip_bind,
>> +	.unbind	= dw_mipi_dsi_rockchip_unbind,
>> +};
>> +
>> +static int dw_mipi_dsi_rockchip_probe(struct platform_device *pdev)
>> +{
>> +	struct device *dev = &pdev->dev;
>> +	struct device_node *np = dev->of_node;
>> +	struct dw_mipi_dsi_rockchip *dsi;
>> +	struct resource *res;
>> +	const struct rockchip_dw_dsi_chip_data *cdata =
>> +				of_device_get_match_data(dev);
>> +	int ret;
>> +
>> +	dsi = devm_kzalloc(dev, sizeof(*dsi), GFP_KERNEL);
>> +	if (!dsi)
>> +		return -ENOMEM;
>> +
>> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> +	if (!res) {
>> +		DRM_ERROR("Unable to get resource\n");
>> +		return -ENODEV;
>> +	}
>> +
>> +	dsi->base = devm_ioremap_resource(dev, res);
>> +	if (IS_ERR(dsi->base)) {
>> +		DRM_ERROR("Unable to get dsi registers\n");
>> +		return PTR_ERR(dsi->base);
>> +	}
>> +
>> +	dsi->pllref_clk = devm_clk_get(dev, "ref");
>> +	if (IS_ERR(dsi->pllref_clk)) {
>> +		ret = PTR_ERR(dsi->pllref_clk);
>> +		DRM_DEV_ERROR(dev,
>> +			      "Unable to get pll reference clock: %d\n", ret);
>> +		return ret;
>> +	}
>> +
>> +	if (cdata->flags & DW_MIPI_NEEDS_PHY_CFG_CLK) {
>> +		dsi->phy_cfg_clk = devm_clk_get(dev, "phy_cfg");
>> +		if (IS_ERR(dsi->phy_cfg_clk)) {
>> +			ret = PTR_ERR(dsi->phy_cfg_clk);
>> +			DRM_DEV_ERROR(dev,
>> +				      "Unable to get phy_cfg_clk: %d\n", ret);
>> +			return ret;
>> +		}
>> +	}
>> +
>> +	if (cdata->flags & DW_MIPI_NEEDS_GRF_CLK) {
>> +		dsi->grf_clk = devm_clk_get(dev, "grf");
>> +		if (IS_ERR(dsi->grf_clk)) {
>> +			ret = PTR_ERR(dsi->grf_clk);
>> +			DRM_DEV_ERROR(dev, "Unable to get grf_clk: %d\n", ret);
>> +			return ret;
>> +		}
>> +	}
>> +
>> +	dsi->grf_regmap = syscon_regmap_lookup_by_phandle(np, "rockchip,grf");
>> +	if (IS_ERR(dsi->grf_regmap)) {
>> +		DRM_DEV_ERROR(dsi->dev, "Unable to get rockchip,grf\n");
>> +		return PTR_ERR(dsi->grf_regmap);
>> +	}
>> +
>> +	dsi->cdata = cdata;
>> +	dsi->dev = dev;
>> +	dev_set_drvdata(dev, dsi);
>> +
>> +	return component_add(&pdev->dev, &dw_mipi_dsi_rockchip_ops);
>> +}
>> +
>> +static int dw_mipi_dsi_rockchip_remove(struct platform_device *pdev)
>> +{
>> +	component_del(&pdev->dev, &dw_mipi_dsi_rockchip_ops);
>> +
>> +	return 0;
>> +}
>> +
>> +static struct rockchip_dw_dsi_chip_data rk3288_chip_data = {
>> +	.dsi0_en_bit = RK3288_DSI0_SEL_VOP_LIT,
>> +	.dsi1_en_bit = RK3288_DSI1_SEL_VOP_LIT,
>> +	.grf_switch_reg = RK3288_GRF_SOC_CON6,
>> +	.max_data_lanes = 4,
>> +};
>> +
>> +static struct rockchip_dw_dsi_chip_data rk3399_chip_data = {
>> +	.dsi0_en_bit = RK3399_DSI0_SEL_VOP_LIT,
>> +	.dsi1_en_bit = RK3399_DSI1_SEL_VOP_LIT,
>> +	.grf_switch_reg = RK3399_GRF_SOC_CON20,
>> +	.grf_dsi0_mode = RK3399_GRF_DSI_MODE,
>> +	.grf_dsi0_mode_reg = RK3399_GRF_SOC_CON22,
>> +	.flags = DW_MIPI_NEEDS_PHY_CFG_CLK | DW_MIPI_NEEDS_GRF_CLK,
>> +	.max_data_lanes = 4,
>> +};
>> +
>> +static const struct of_device_id dw_mipi_dsi_rockchip_dt_ids[] = {
>> +	{
>> +	 .compatible = "rockchip,rk3288-mipi-dsi",
>> +	 .data = &rk3288_chip_data,
>> +	}, {
>> +	 .compatible = "rockchip,rk3399-mipi-dsi",
>> +	 .data = &rk3399_chip_data,
>> +	},
>> +	{ /* sentinel */ }
>> +};
>> +MODULE_DEVICE_TABLE(of, dw_mipi_dsi_rockchip_dt_ids);
>> +
>> +struct platform_driver dw_mipi_dsi_rockchip_driver = {
>> +	.probe		= dw_mipi_dsi_rockchip_probe,
>> +	.remove		= dw_mipi_dsi_rockchip_remove,
>> +	.driver		= {
>> +		.of_match_table = dw_mipi_dsi_rockchip_dt_ids,
>> +		.name	= "dw-mipi-dsi-rockchip",
>> +	},
>> +};
>> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
>> index 76d63de..d40cc39 100644
>> --- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
>> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
>> @@ -462,7 +462,7 @@ static int __init rockchip_drm_init(void)
>>   	ADD_ROCKCHIP_SUB_DRIVER(cdn_dp_driver, CONFIG_ROCKCHIP_CDN_DP);
>>   	ADD_ROCKCHIP_SUB_DRIVER(dw_hdmi_rockchip_pltfm_driver,
>>   				CONFIG_ROCKCHIP_DW_HDMI);
>> -	ADD_ROCKCHIP_SUB_DRIVER(dw_mipi_dsi_driver,
>> +	ADD_ROCKCHIP_SUB_DRIVER(dw_mipi_dsi_rockchip_driver,
>>   				CONFIG_ROCKCHIP_DW_MIPI_DSI);
>>   	ADD_ROCKCHIP_SUB_DRIVER(inno_hdmi_driver, CONFIG_ROCKCHIP_INNO_HDMI);
>>   
>> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.h b/drivers/gpu/drm/rockchip/rockchip_drm_drv.h
>> index 498dfbc..af235b2 100644
>> --- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.h
>> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.h
>> @@ -66,7 +66,7 @@ void rockchip_drm_dma_detach_device(struct drm_device *drm_dev,
>>   
>>   extern struct platform_driver cdn_dp_driver;
>>   extern struct platform_driver dw_hdmi_rockchip_pltfm_driver;
>> -extern struct platform_driver dw_mipi_dsi_driver;
>> +extern struct platform_driver dw_mipi_dsi_rockchip_driver;
>>   extern struct platform_driver inno_hdmi_driver;
>>   extern struct platform_driver rockchip_dp_driver;
>>   extern struct platform_driver rockchip_lvds_driver;
>
>


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