Re: [PATCH v3 1/2] drm/bridge: Add Cadence DSI driver

[Andrzej Hajda <a.hajda@xxxxxxxxxxx>]

On 31.08.2017 17:55, Boris Brezillon wrote:
> Add a driver for Cadence DPI -> DSI bridge.
>
> This driver only support a subset of Cadence DSI bridge capabilities.
>
> Here is a non-exhaustive list of missing features:
>  * burst mode
>  * dynamic configuration of the DPHY based on the
>  * support for additional input interfaces (SDI input)
>
> Signed-off-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxxxxxxx>
> ---
> Changes in v3:
> - replace magic values by real timing calculation. The DPHY PLL clock
>   is still hardcoded since we don't have a working DPHY block yet, and
>   this is the piece of HW we need to dynamically configure the PLL
>   rate based on the display refresh rate and the resolution.
> - parse DSI devices represented with the OF-graph. This is needed to
>   support DSI devices controlled through an external bus like I2C or
>   SPI.
> - use the DRM panel-bridge infrastructure to simplify the DRM panel
>   logic
>
> Changes in v2:
> - rebase on v4.12-rc1 and adapt to driver to the drm_bridge API changes
> - return the correct error when devm_clk_get(sysclk) fails
> - add missing depends on OF and select DRM_PANEL in the Kconfig entry
> ---
>  drivers/gpu/drm/bridge/Kconfig    |    9 +
>  drivers/gpu/drm/bridge/Makefile   |    1 +
>  drivers/gpu/drm/bridge/cdns-dsi.c | 1090 +++++++++++++++++++++++++++++++++++++
>  3 files changed, 1100 insertions(+)
>  create mode 100644 drivers/gpu/drm/bridge/cdns-dsi.c
>
> diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
> index adf9ae0e0b7c..88c324b12e16 100644
> --- a/drivers/gpu/drm/bridge/Kconfig
> +++ b/drivers/gpu/drm/bridge/Kconfig
> @@ -25,6 +25,15 @@ config DRM_ANALOGIX_ANX78XX
>  	  the HDMI output of an application processor to MyDP
>  	  or DisplayPort.
>  
> +config DRM_CDNS_DSI
> +	tristate "Cadence DPI/DSI bridge"
> +	select DRM_KMS_HELPER
> +	select DRM_MIPI_DSI
> +	select DRM_PANEL

what about:
select DRM_PANEL_BRIDGE

> +	depends on OF
> +	help
> +	  Support Cadence DPI to DSI bridge.
> +
>  config DRM_DUMB_VGA_DAC
>  	tristate "Dumb VGA DAC Bridge support"
>  	depends on OF
> diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
> index defcf1e7ca1c..77b65e8ecf59 100644
> --- a/drivers/gpu/drm/bridge/Makefile
> +++ b/drivers/gpu/drm/bridge/Makefile
> @@ -1,4 +1,5 @@
>  obj-$(CONFIG_DRM_ANALOGIX_ANX78XX) += analogix-anx78xx.o
> +obj-$(CONFIG_DRM_CDNS_DSI) += cdns-dsi.o
>  obj-$(CONFIG_DRM_DUMB_VGA_DAC) += dumb-vga-dac.o
>  obj-$(CONFIG_DRM_LVDS_ENCODER) += lvds-encoder.o
>  obj-$(CONFIG_DRM_MEGACHIPS_STDPXXXX_GE_B850V3_FW) += megachips-stdpxxxx-ge-b850v3-fw.o
> diff --git a/drivers/gpu/drm/bridge/cdns-dsi.c b/drivers/gpu/drm/bridge/cdns-dsi.c
> new file mode 100644
> index 000000000000..f5dc26c90b20
> --- /dev/null
> +++ b/drivers/gpu/drm/bridge/cdns-dsi.c
> @@ -0,0 +1,1090 @@
> +/*
> + * Copyright: 2017 Cadence Design Systems, Inc.
> + *
> + * Author: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxxxxxxx>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License version 2 as published by
> + * the Free Software Foundation.
> + *
> + * 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.
> + *
> + * You should have received a copy of the GNU General Public License along with
> + * this program.  If not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_bridge.h>
> +#include <drm/drm_crtc_helper.h>
> +#include <drm/drm_mipi_dsi.h>
> +#include <drm/drm_panel.h>
> +#include <video/mipi_display.h>
> +
> +#include <linux/clk.h>
> +#include <linux/iopoll.h>
> +#include <linux/module.h>
> +#include <linux/of_graph.h>
> +#include <linux/platform_device.h>
> +
> +#define IP_CONF				0x0
> +#define SP_HS_FIFO_DEPTH(x)		(((x) & GENMASK(30, 26)) >> 26)
> +#define SP_LP_FIFO_DEPTH(x)		(((x) & GENMASK(25, 21)) >> 21)
> +#define VRS_FIFO_DEPTH(x)			(((x) & GENMASK(20, 16)) >> 16)
> +#define DIRCMD_FIFO_DEPTH(x)		(((x) & GENMASK(15, 13)) >> 13)
> +#define SDI_IFACE_32			BIT(12)
> +#define INTERNAL_DATAPATH_32		(0 << 10)
> +#define INTERNAL_DATAPATH_16		(1 << 10)
> +#define INTERNAL_DATAPATH_8		(3 << 10)
> +#define INTERNAL_DATAPATH_SIZE		((x) & GENMASK(11, 10))
> +#define INTERNAL_DATAPATH_32		(0 << 10)
> +#define INTERNAL_DATAPATH_16		(1 << 10)
> +#define INTERNAL_DATAPATH_8		(3 << 10)
> +#define NUM_IFACE(x)			((((x) & GENMASK(9, 8)) >> 8) + 1)
> +#define MAX_LANE_NB(x)			(((x) & GENMASK(7, 6)) >> 6)
> +#define RX_FIFO_DEPTH(x)		((x) & GENMASK(5, 0))
> +
> +#define MCTL_MAIN_DATA_CTL		0x4
> +#define TE_MIPI_POLLING_EN		BIT(25)
> +#define TE_HW_POLLING_EN		BIT(24)
> +#define DISP_EOT_GEN			BIT(18)
> +#define HOST_EOT_GEN			BIT(17)
> +#define DISP_GEN_CHECKSUM		BIT(16)
> +#define DISP_GEN_ECC			BIT(15)
> +#define BTA_EN				BIT(14)
> +#define READ_EN				BIT(13)
> +#define REG_TE_EN			BIT(12)
> +#define IF_TE_EN(x)			BIT(8 + (x))
> +#define TBG_SEL				BIT(7)
> +#define TVG_SEL				BIT(6)
> +#define VID_EN				BIT(5)
> +#define IF_VID_SELECT(x)		((x) << 2)
> +#define IF_VID_SELECT_MASK		GENMASK(4, 2)
> +#define IF_VID_MODE			BIT(1)
> +#define LINK_EN				BIT(0)
> +
> +#define MCTL_MAIN_PHY_CTL		0x8
> +#define CLK_FORCE_STOP			BIT(14)
> +#define WAIT_BURST_TIME(x)		((x) << 10)
> +#define DATA_ULPM_EN(x)			BIT(6 + (x))
> +#define CLK_ULPM_EN			BIT(5)
> +#define CLK_CONTINUOUS			BIT(4)
> +#define DATA_FORCE_STOP			BIT(3)
> +#define DATA_LANE_EN(x)			BIT((x) - 1)
> +
> +#define MCTL_LANE_STS			0x10
> +#define LANE_STATE_START		0
> +#define LANE_STATE_IDLE			1
> +#define LANE_STATE_WRITE		2
> +#define LANE_STATE_ULPM			3
> +#define LANE_STATE_READ			4
> +#define DATA_LANE_STATE(l, val)		\
> +	(((val) >> (2 + 2 * (l) + ((l) ? 1 : 0))) & GENMASK((l) ? 1 : 2, 0))
> +#define CLK_LANE_STATE_HS		2
> +#define CLK_LANE_STATE(val)		((val) & GENMASK(1, 0))
> +
> +#define MCTL_DPHY_TIMEOUT1		0x14
> +#define CLK_DIV(x)			(x)
> +#define CLK_DIV_MAX			GENMASK(3, 0)
> +#define HSTX_TIMEOUT(x)			((x) << 4)
> +#define HSTX_TIMEOUT_MAX		GENMASK(21, 4)
> +
> +#define MCTL_DPHY_TIMEOUT2		0x18
> +#define LPRX_TIMEOUT(x)			(x)
> +
> +#define MCTL_ULPOUT_TIME		0x1c
> +#define DATA_LANE_ULPOUT_TIME(x)	((x) << 9)
> +#define CLK_LANE_ULPOUT_TIME(x)		(x)
> +
> +#define MCTL_DPHY_STATIC		0x20
> +#define INVERT_DATA_HS(l)		BIT((l) * (2 + 1) + 1)
> +#define SWAP_DATA_PINS(l)		BIT((l) * (2 + 1))
> +#define INVERT_CLK_HS			BIT(1)
> +#define SWAP_CLK_PINS			BIT(0)
> +
> +#define MCTL_MAIN_EN			0x24
> +#define IF_EN(x)			BIT(13 + (x))
> +#define DATA_LANE_ULPM_REQ(l)		BIT(9 + (l))
> +#define CLK_LANE_ULPM_REQ		BIT(8)
> +#define DATA_LANE_START(x)		BIT(4 + (x))
> +#define CLK_LANE_EN			BIT(3)
> +#define PLL_START			BIT(0)
> +
> +#define MCTL_MAIN_STS			0x28
> +#define MCTL_MAIN_STS_CTL		0x130
> +#define MCTL_MAIN_STS_CLR		0x150
> +#define MCTL_MAIN_STS_FLAG		0x170
> +#define IF_UNTERM_PKT_ERR(x)		BIT(8 + (x))
> +#define LPRX_TIMEOUT_ERR		BIT(7)
> +#define HSTX_TIMEOUT_ERR		BIT(6)
> +#define DATA_LANE_RDY(l)		BIT(2 + (l))
> +#define CLK_LANE_RDY			BIT(1)
> +#define PLL_LOCKED			BIT(0)
> +
> +#define MCTL_DPHY_ERR			0x2c
> +#define MCTL_DPHY_ERR_CTL1		0x148
> +#define MCTL_DPHY_ERR_CLR		0x168
> +#define MCTL_DPHY_ERR_FLAG		0x188
> +#define ERR_CONT_LP(x, l)		BIT(18 + ((x) * 4) + (l))
> +#define ERR_CONTROL(l)			BIT(14 + (l))
> +#define ERR_SYNESC(l)			BIT(10 + (l))
> +#define ERR_ESC(l)			BIT(6 + (l))
> +
> +#define MCTL_DPHY_ERR_CTL2		0x14c
> +#define ERR_CONT_LP_EDGE(x, l)		BIT(12 + ((x) * 4) + (l))
> +#define ERR_CONTROL_EDGE(l)		BIT(8 + (l))
> +#define ERR_SYN_ESC_EDGE(l)		BIT(4 + (l))
> +#define ERR_ESC_EDGE(l)			BIT(0 + (l))
> +
> +#define CMD_MODE_CTL			0x70
> +#define IF_VCHAN_ID(x, c)		((c) << ((x) * 2))
> +#define IF_LP_EN(x)			BIT(9 + (x))
> +
> +#define CMD_MODE_CTL2			0x74
> +#define TE_TIMEOUT(x)			((x) << 11)
> +#define FILL_VALUE(x)			((x) << 3)
> +#define ARB_IF_WITH_HIGHEST_PRIORITY(x)	((x) << 1)
> +#define ARB_ROUND_ROBIN_MODE		BIT(0)
> +
> +#define CMD_MODE_STS			0x78
> +#define CMD_MODE_STS_CTL		0x134
> +#define CMD_MODE_STS_CLR		0x154
> +#define CMD_MODE_STS_FLAG		0x174
> +#define ERR_IF_UNDERRUN(x)		BIT(4 + (x))
> +#define ERR_UNWANTED_READ		BIT(3)
> +#define ERR_TE_MISS			BIT(2)
> +#define ERR_NO_TE			BIT(1)
> +#define CSM_RUNNING			BIT(0)
> +
> +#define DIRECT_CMD_SEND			0x80
> +
> +#define DIRECT_CMD_MAIN_SETTINGS	0x84
> +#define TRIGGER_VAL(x)			((x) << 25)
> +#define CMD_LP_EN			BIT(24)
> +#define CMD_SIZE(x)			((x) << 16)
> +#define CMD_VCHAN_ID(x)			((x) << 14)
> +#define CMD_DATATYPE(x)			((x) << 8)
> +#define CMD_LONG			BIT(3)
> +#define WRITE_CMD			0
> +#define READ_CMD			1
> +#define TE_REQ				4
> +#define TRIGGER_REQ			5
> +#define BTA_REQ				6
> +
> +#define DIRECT_CMD_STS			0x88
> +#define DIRECT_CMD_STS_CTL		0x138
> +#define DIRECT_CMD_STS_CLR		0x158
> +#define DIRECT_CMD_STS_FLAG		0x178
> +#define RCVD_ACK_VAL(val)		((val) >> 16)
> +#define RCVD_TRIGGER_VAL(val)		(((val) & GENMASK(14, 11)) >> 11)
> +#define READ_COMPLETED_WITH_ERR		BIT(10)
> +#define BTA_FINISHED			BIT(9)
> +#define BTA_COMPLETED			BIT(8)
> +#define TE_RCVD				BIT(7)
> +#define TRIGGER_RCVD			BIT(6)
> +#define ACK_WITH_ERR_RCVD		BIT(5)
> +#define ACK_RCVD			BIT(4)
> +#define READ_COMPLETED			BIT(3)
> +#define TRIGGER_COMPLETED		BIT(2)
> +#define WRITE_COMPLETED			BIT(1)
> +#define SENDING_CMD			BIT(0)
> +
> +#define DIRECT_CMD_STOP_READ		0x8c
> +
> +#define DIRECT_CMD_WRDATA		0x90
> +#define WRDAT(x, val)			((val) << ((x) * 8))
> +
> +#define DIRECT_CMD_FIFO_RST		0x94
> +
> +#define DIRECT_CMD_RDDATA		0xa0
> +#define RDDAT(x, val)			(((val) >> ((x) * 8)) & GENMASK(7, 0))
> +
> +#define DIRECT_CMD_RD_PROPS		0xa4
> +#define RD_DCS				BIT(18)
> +#define RD_VCHAN_ID(val)		(((val) >> 16) & GENMASK(1, 0))
> +#define RD_SIZE(val)			((val) & GENMASK(15, 0))
> +
> +#define DIRECT_CMD_RD_STS		0xa8
> +#define DIRECT_CMD_RD_STS_CTL		0x13c
> +#define DIRECT_CMD_RD_STS_CLR		0x15c
> +#define DIRECT_CMD_RD_STS_FLAG		0x17c
> +#define ERR_EOT_WITH_ERR		BIT(8)
> +#define ERR_MISSING_EOT			BIT(7)
> +#define ERR_WRONG_LENGTH		BIT(6)
> +#define ERR_OVERSIZE			BIT(5)
> +#define ERR_RECEIVE			BIT(4)
> +#define ERR_UNDECODABLE			BIT(3)
> +#define ERR_CHECKSUM			BIT(2)
> +#define ERR_UNCORRECTABLE		BIT(1)
> +#define ERR_FIXED			BIT(0)
> +
> +#define VID_MAIN_CTL			0xb0
> +#define VID_FIELD_SW			BIT(28)
> +#define VID_INTERLACED_EN		BIT(27)
> +#define RECOVERY_MODE(x)		((x) << 25)
> +#define RECOVERY_MODE_NEXT_HSYNC	0
> +#define RECOVERY_MODE_NEXT_STOP_POINT	2
> +#define RECOVERY_MODE_NEXT_VSYNC	3
> +#define REG_BLKEOL_MODE(x)		((x) << 23)
> +#define REG_BLKLINE_MODE(x)		((x) << 21)
> +#define REG_BLK_MODE_NULL_PKT		0
> +#define REG_BLK_MODE_BLANKING_PKT	1
> +#define REG_BLK_MODE_LP			2
> +#define SYNC_PULSE_HORIZONTAL		BIT(20)
> +#define SYNC_PULSE_ACTIVE		BIT(19)
> +#define BURST_MODE			BIT(18)
> +#define VID_PIXEL_MODE_MASK		GENMASK(17, 14)
> +#define VID_PIXEL_MODE_RGB565		(0 << 14)
> +#define VID_PIXEL_MODE_RGB666_PACKED	(1 << 14)
> +#define VID_PIXEL_MODE_RGB666		(2 << 14)
> +#define VID_PIXEL_MODE_RGB888		(3 << 14)
> +#define VID_PIXEL_MODE_RGB101010	(4 << 14)
> +#define VID_PIXEL_MODE_RGB121212	(5 << 14)
> +#define VID_PIXEL_MODE_YUV420		(8 << 14)
> +#define VID_PIXEL_MODE_YUV422_PACKED	(9 << 14)
> +#define VID_PIXEL_MODE_YUV422		(10 << 14)
> +#define VID_PIXEL_MODE_YUV422_24B	(11 << 14)
> +#define VID_DATATYPE(x)			((x) << 8)
> +#define VID_VIRTCHAN_ID(iface, x)	((x) << (4 + (iface) * 2))
> +#define STOP_MODE(x)			((x) << 2)
> +#define START_MODE(x)			(x)
> +
> +#define VID_VSIZE1			0xb4
> +#define VFP_LEN(x)			((x) << 12)
> +#define VBP_LEN(x)			((x) << 6)
> +#define VSA_LEN(x)			(x)
> +
> +#define VID_VSIZE2			0xb8
> +#define VACT_LEN(x)			(x)
> +
> +#define VID_HSIZE1			0xc0
> +#define HFP_LEN(x)			((x) << 20)
> +#define HBP_LEN(x)			((x) << 10)
> +#define HSA_LEN(x)			(x)
> +
> +#define VID_HSIZE2			0xc4
> +#define HACT_LEN(x)			(x)
> +
> +#define VID_BLKSIZE1			0xcc
> +#define BLK_EOL_PKT_LEN(x)		((x) << 15)
> +#define BLK_LINE_EVENT_PKT_LEN(x)	(x)
> +
> +#define VID_BLKSIZE2			0xd0
> +#define BLK_LINE_PULSE_PKT_LEN(x)	(x)
> +
> +#define VID_PKT_TIME			0xd8
> +#define BLK_EOL_DURATION(x)		(x)
> +
> +#define VID_DPHY_TIME			0xdc
> +#define REG_WAKEUP_TIME(x)		((x) << 17)
> +#define REG_LINE_DURATION(x)		(x)
> +
> +#define VID_ERR_COLOR1			0xe0
> +#define COL_GREEN(x)			((x) << 12)
> +#define COL_RED(x)			(x)
> +
> +#define VID_ERR_COLOR2			0xe4
> +#define PAD_VAL(x)			((x) << 12)
> +#define COL_BLUE(x)			(x)
> +
> +#define VID_VPOS			0xe8
> +#define LINE_VAL(val)			(((val) & GENMASK(14, 2)) >> 2)
> +#define LINE_POS(val)			((val) & GENMASK(1, 0))
> +
> +#define VID_HPOS			0xec
> +#define HORIZ_VAL(val)			(((val) & GENMASK(17, 3)) >> 3)
> +#define HORIZ_POS(val)			((val) & GENMASK(2, 0))
> +
> +#define VID_MODE_STS			0xf0
> +#define VID_MODE_STS_CTL		0x140
> +#define VID_MODE_STS_CLR		0x160
> +#define VID_MODE_STS_FLAG		0x180
> +#define VSG_RECOVERY			BIT(10)
> +#define ERR_VRS_WRONG_LEN		BIT(9)
> +#define ERR_LONG_READ			BIT(8)
> +#define ERR_LINE_WRITE			BIT(7)
> +#define ERR_BURST_WRITE			BIT(6)
> +#define ERR_SMALL_HEIGHT		BIT(5)
> +#define ERR_SMALL_LEN			BIT(4)
> +#define ERR_MISSING_VSYNC		BIT(3)
> +#define ERR_MISSING_HSYNC		BIT(2)
> +#define ERR_MISSING_DATA		BIT(1)
> +#define VSG_RUNNING			BIT(0)
> +
> +#define VID_VCA_SETTING1		0xf4
> +#define BURST_LP			BIT(16)
> +#define MAX_BURST_LIMIT(x)		(x)
> +
> +#define VID_VCA_SETTING2		0xf8
> +#define MAX_LINE_LIMIT(x)		((x) << 16)
> +#define EXACT_BURST_LIMIT(x)		(x)
> +
> +#define TVG_CTL				0xfc
> +#define TVG_STRIPE_SIZE(x)		((x) << 5)
> +#define TVG_MODE_MASK			GENMASK(4, 3)
> +#define TVG_MODE_SINGLE_COLOR		(0 << 3)
> +#define TVG_MODE_VSTRIPES		(2 << 3)
> +#define TVG_MODE_HSTRIPES		(3 << 3)
> +#define TVG_STOPMODE_MASK		GENMASK(2, 1)
> +#define TVG_STOPMODE_EOF		(0 << 1)
> +#define TVG_STOPMODE_EOL		(1 << 1)
> +#define TVG_STOPMODE_NOW		(2 << 1)
> +#define TVG_RUN				BIT(0)
> +
> +#define TVG_IMG_SIZE			0x100
> +#define TVG_NBLINES(x)			((x) << 16)
> +#define TVG_LINE_SIZE(x)		(x)
> +
> +#define TVG_COLOR1			0x104
> +#define TVG_COL1_GREEN(x)		((x) << 12)
> +#define TVG_COL1_RED(x)			(x)
> +
> +#define TVG_COLOR1_BIS			0x108
> +#define TVG_COL1_BLUE(x)		(x)
> +
> +#define TVG_COLOR2			0x10c
> +#define TVG_COL2_GREEN(x)		((x) << 12)
> +#define TVG_COL2_RED(x)			(x)
> +
> +#define TVG_COLOR2_BIS			0x110
> +#define TVG_COL2_BLUE(x)		(x)
> +
> +#define TVG_STS				0x114
> +#define TVG_STS_RUNNING			BIT(0)
> +
> +#define TBG_CTL				0x118
> +#define TBG_MODE_MASK			GENMASK(4, 3)
> +#define TBG_MODE_START_1B_STOP		(0 << 3)
> +#define TBG_MODE_START_2B_STOP		(1 << 3)
> +#define TBG_MODE_START_BURST_CNT_STOP	(2 << 3)
> +#define TBG_MODE_START_BURST_STOP	(3 << 3)
> +#define TBG_DATA_SEL			BIT(2)
> +#define TBG_HS_REQ			BIT(1)
> +#define TBG_START			BIT(0)
> +
> +#define TBG_SETTING1			0x11c
> +#define TBG_SETTING2			0x120
> +
> +#define TBG_STS				0x124
> +#define TBG_STS_RUNNING			BIT(0)
> +
> +#define TVG_TBG_STS_CTL			0x144
> +#define TVG_TBG_STS_CLR			0x164
> +#define TVG_TBG_STS_FLAG		0x184
> +#define TVG_TBG_STS_TBG_RUNNING		BIT(1)
> +#define TVG_TBG_STS_TVG_RUNNING		BIT(0)
> +
> +#define STS_CTL_EDGE(e)			((e) << 16)
> +
> +#define DPHY_LANES_MAP			0x198
> +#define DAT_REMAP_CFG(b, l)		((l) << ((b) * 8))
> +
> +#define DPI_IRQ_EN			0x1a0
> +#define DPI_IRQ_CLR			0x1a4
> +#define DPI_IRQ_STS			0x1a8
> +#define PIXEL_BUF_OVERFLOW		BIT(0)
> +
> +#define DPI_CFG				0x1ac
> +#define DPI_CFG_FIFO_LEVEL(x)		((x) & GENMASK(15, 0))
> +#define DPI_CFG_FIFO_DEPTH(x)		((x) >> 16)
> +
> +#define DPHY_CFG0			0x1b0
> +#define DPHY_C_RSTB			BIT(20)
> +#define DPHY_D_RSTB(x)			((x) << 16)
> +#define DPHY_TIF_FORCE_WRITE		BIT(12)
> +#define DPHY_PLL_PDN			BIT(10)
> +#define DPHY_CMN_PDN			BIT(9)
> +#define DPHY_C_PDN			BIT(8)
> +#define DPHY_D_PDN(x)			((x) << 4)
> +#define DPHY_PLL_PSO			BIT(1)
> +#define DPHY_CMN_PSO			BIT(0)
> +
> +#define DPHY_CFG1			0x1b4
> +#define PDHY_PLL_OPDIV(x)		((x) << 20)
> +#define PDHY_PLL_IPDIV(x)		((x) << 12)
> +#define PDHY_PLL_FBDIV(x)		(x)
> +
> +#define DPHY_PLL_TM_LO			0x1b8
> +#define DPHY_PLL_TM_MID			0x1bc
> +#define DPHY_PLL_TM_HI			0x1c0
> +
> +#define DPHY_STATUS			0x1c4
> +#define PPI_D_RX_ULPS_ESC(x)		((x) >> 12)
> +#define PPI_C_TX_READY_HS		BIT(8)
> +#define PPI_PLL_LOCK			BIT(7)
> +#define PPI_PLL_COARSE			BIT(6)
> +#define PPI_PLL_COARSE_CODE(x)		((x) & GENMASK(5, 0))
> +
> +#define DPHY_BIST			0x1c8
> +#define PSO_BYPASS_CTX_EN		BIT(12)
> +#define PSO_BYPASS_TX_EN(l)		BIT(8 + (l))
> +#define BIST_CTX_EN			BIT(4)
> +#define BIST_TX_EN(l)			BIT(l)
> +
> +#define TEST_GENERIC			0x1cc
> +#define TEST_STATUS(x)			((x) >> 16)
> +#define TEST_CTRL(x)			(x)
> +
> +#define ID_REG				0x1f0
> +#define REV_VENDOR_ID(x)		(((x) & GENMASK(31, 20)) >> 20)
> +#define REV_PRODUCT_ID(x)		(((x) & GENMASK(19, 12)) >> 12)
> +#define REV_HW(x)			(((x) & GENMASK(11, 8)) >> 8)
> +#define REV_MAJOR(x)			(((x) & GENMASK(7, 4)) >> 4)
> +#define REV_MINOR(x)			((x) & GENMASK(3, 0))
> +
> +#define DSI_OUTPUT_PORT			0
> +#define DSI_INPUT_PORT(inputid)		(1 + (inputid))
> +
> +struct cdns_dsi_output {
> +	struct mipi_dsi_device *dev;
> +	struct drm_panel *panel;
> +	struct drm_bridge *bridge;
> +};
> +
> +enum cdns_dsi_input_id {
> +	CDNS_DPI_INPUT = 0,
> +};
> +
> +struct cdns_dsi_input {
> +	enum cdns_dsi_input_id id;
> +	struct drm_bridge bridge;
> +};
> +
> +struct cdns_dsi {
> +	struct mipi_dsi_host base;
> +	void __iomem *regs;
> +	struct cdns_dsi_input input;
> +	struct cdns_dsi_output output;
> +	unsigned int direct_cmd_fifo_depth;
> +	unsigned int rx_fifo_depth;
> +	struct completion direct_cmd_comp;
> +	struct clk *pclk;
> +	struct clk *sysclk;
> +};
> +
> +static inline struct cdns_dsi *input_to_dsi(struct cdns_dsi_input *input)
> +{
> +	return container_of(input, struct cdns_dsi, input);
> +}
> +
> +static inline struct cdns_dsi *to_cdns_dsi(struct mipi_dsi_host *host)
> +{
> +	return container_of(host, struct cdns_dsi, base);
> +}
> +
> +static inline struct cdns_dsi_input *
> +bridge_to_cdns_dsi_input(struct drm_bridge *bridge)
> +{
> +	return container_of(bridge, struct cdns_dsi_input, bridge);
> +}
> +
> +static int cdns_dsi_bridge_attach(struct drm_bridge *bridge)
> +{
> +	struct cdns_dsi_input *input = bridge_to_cdns_dsi_input(bridge);
> +	struct cdns_dsi *dsi = input_to_dsi(input);
> +	struct cdns_dsi_output *output = &dsi->output;
> +
> +	if (!drm_core_check_feature(bridge->dev, DRIVER_ATOMIC)) {
> +		dev_err(dsi->base.dev,
> +			"cdns-dsi driver is only compatible with DRM devices supporting atomic updates");
> +		return -ENOTSUPP;
> +	}
> +
> +	return drm_bridge_attach(bridge->encoder, output->bridge, bridge);
> +}
> +
> +static enum drm_mode_status
> +cdns_dsi_bridge_mode_valid(struct drm_bridge *bridge,
> +			   const struct drm_display_mode *mode)
> +{
> +	struct cdns_dsi_input *input = bridge_to_cdns_dsi_input(bridge);
> +	struct cdns_dsi *dsi = input_to_dsi(input);
> +	struct cdns_dsi_output *output = &dsi->output;
> +	int bpp;
> +
> +	/*
> +	 * VFP_DSI should be less than VFP_DPI and VFP_DSI should be at
> +	 * least 1.
> +	 */
> +	if (mode->vtotal - mode->vsync_end < 2)
> +		return MODE_V_ILLEGAL;
> +
> +	/* VSA_DSI = VSA_DPI and must be at least 2. */
> +	if (mode->vsync_end - mode->vsync_start < 2)
> +		return MODE_V_ILLEGAL;
> +
> +	/* HACT must be a 32-bits aligned. */
> +	bpp = mipi_dsi_pixel_format_to_bpp(output->dev->format);
> +	if ((mode->hdisplay * bpp) % 32)
> +		return MODE_H_ILLEGAL;
> +
> +	return MODE_OK;
> +}
> +
> +static void cdns_dsi_bridge_disable(struct drm_bridge *bridge)
> +{
> +	struct cdns_dsi_input *input = bridge_to_cdns_dsi_input(bridge);
> +	struct cdns_dsi *dsi = input_to_dsi(input);
> +	u32 val;
> +
> +	val = readl(dsi->regs + MCTL_MAIN_DATA_CTL);
> +	val &= ~(IF_VID_SELECT_MASK | IF_VID_MODE | VID_EN | HOST_EOT_GEN |
> +		 DISP_EOT_GEN);
> +	writel(val, dsi->regs + MCTL_MAIN_DATA_CTL);
> +
> +	val = readl(dsi->regs + MCTL_MAIN_EN) & ~IF_EN(input->id);
> +	writel(val, dsi->regs + MCTL_MAIN_EN);
> +}
> +
> +#define DSI_HBP_FRAME_OVERHEAD		12
> +#define DSI_HSA_FRAME_OVERHEAD		14
> +#define DSI_HFP_FRAME_OVERHEAD		6
> +#define DSI_HSS_VSS_VSE_FRAME_OVERHEAD	4
> +#define DSI_BLANKING_FRAME_OVERHEAD	6
> +#define DSI_NULL_FRAME_OVERHEAD		6
> +#define DSI_EOT_PKT_SIZE		4
> +
> +#define REG_WAKEUP_TIME_NS		800
> +#define DPHY_PLL_RATE_HZ		108000000
> +
> +static void cdns_dsi_bridge_enable(struct drm_bridge *bridge)
> +{
> +	struct cdns_dsi_input *input = bridge_to_cdns_dsi_input(bridge);
> +	struct cdns_dsi *dsi = input_to_dsi(input);
> +	struct cdns_dsi_output *output = &dsi->output;
> +	u32 hsize0, hsa, hline, tmp, reg_wakeup, div;
> +	unsigned long dphy_pll_period, tx_byte_period;
> +	struct drm_display_mode *mode;
> +	int bpp, nlanes;
> +
> +	mode = &bridge->encoder->crtc->state->adjusted_mode;
> +	bpp = mipi_dsi_pixel_format_to_bpp(output->dev->format);
> +	nlanes = output->dev->lanes;
> +
> +	if (output->dev->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE)
> +		tmp = mode->crtc_htotal - mode->crtc_hsync_end;
> +	else
> +		tmp = mode->crtc_htotal - mode->crtc_hsync_start;
> +	tmp = (tmp * bpp) / 8;
> +	tmp = tmp < DSI_HBP_FRAME_OVERHEAD ? 0 : tmp - DSI_HBP_FRAME_OVERHEAD;
> +	hsize0 = HBP_LEN(tmp);
> +
> +	tmp = mode->crtc_hsync_start - mode->crtc_hdisplay;
> +	tmp = (tmp * bpp) / 8;
> +	tmp = tmp < DSI_HFP_FRAME_OVERHEAD ? 0 : tmp - DSI_HFP_FRAME_OVERHEAD;
> +	hsize0 |= HFP_LEN(tmp);
> +
> +	if (output->dev->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE)
> +		tmp = mode->crtc_hsync_end - mode->crtc_hsync_start;
> +	else
> +		tmp = 0;
> +	tmp = (tmp * 8) / bpp;
> +	tmp = tmp < DSI_HSA_FRAME_OVERHEAD ? 0 : tmp - DSI_HSA_FRAME_OVERHEAD;
> +	hsa = tmp;
> +	hsize0 |= HSA_LEN(tmp);
> +
> +	writel(hsize0, dsi->regs + VID_HSIZE1);
> +	writel((mode->crtc_hdisplay * bpp) / 8, dsi->regs + VID_HSIZE2);
> +
> +	writel(VBP_LEN(mode->crtc_vtotal - mode->crtc_vsync_end - 1) |
> +	       VFP_LEN(mode->crtc_vsync_start - mode->crtc_vdisplay) |
> +	       VSA_LEN(mode->crtc_vsync_end - mode->crtc_vsync_start),
> +	       dsi->regs + VID_VSIZE1);
> +	writel(mode->crtc_vdisplay, dsi->regs + VID_VSIZE2);
> +
> +	hline = (mode->crtc_htotal * bpp) / 8;
> +	tmp = hline - DSI_HSA_FRAME_OVERHEAD;
> +	if (output->dev->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE)
> +		tmp -= hsa + DSI_HSA_FRAME_OVERHEAD;
> +
> +	writel(BLK_LINE_PULSE_PKT_LEN(tmp), dsi->regs + VID_BLKSIZE2);
> +	if (output->dev->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE)
> +		writel(MAX_LINE_LIMIT(tmp - DSI_NULL_FRAME_OVERHEAD),
> +		       dsi->regs + VID_VCA_SETTING2);
> +
> +	tmp = hline -
> +	      (DSI_HSS_VSS_VSE_FRAME_OVERHEAD + DSI_BLANKING_FRAME_OVERHEAD);
> +	writel(BLK_LINE_EVENT_PKT_LEN(tmp), dsi->regs + VID_BLKSIZE1);
> +	if (!(output->dev->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE))
> +		writel(MAX_LINE_LIMIT(tmp - DSI_NULL_FRAME_OVERHEAD),
> +		       dsi->regs + VID_VCA_SETTING2);
> +
> +	tmp = DIV_ROUND_UP(hline, nlanes) - DIV_ROUND_UP(hsa, nlanes);
> +
> +	if (!(output->dev->mode_flags & MIPI_DSI_MODE_EOT_PACKET))
> +		tmp -= DIV_ROUND_UP(DSI_EOT_PKT_SIZE, nlanes);
> +
> +	dphy_pll_period = NSEC_PER_SEC / DPHY_PLL_RATE_HZ;
> +	tx_byte_period = (dphy_pll_period * 2) / 8;
> +	reg_wakeup = REG_WAKEUP_TIME_NS / dphy_pll_period;
> +	writel(REG_WAKEUP_TIME(reg_wakeup) | REG_LINE_DURATION(tmp),
> +	       dsi->regs + VID_DPHY_TIME);
> +
> +	/*
> +	 * HSTX and LPRX timeouts are both expressed in TX byte clk cycles and
> +	 * both should be set to at least the time it takes to transmit a
> +	 * frame.
> +	 */
> +	tmp = NSEC_PER_SEC / mode->vrefresh;
> +	tmp /= tx_byte_period;
> +
> +	for (div = 0; div <= CLK_DIV_MAX; div++) {
> +		if (tmp <= HSTX_TIMEOUT_MAX)
> +			break;
> +
> +		tmp >>= 1;
> +	}
> +
> +	if (tmp > HSTX_TIMEOUT_MAX)
> +		tmp = HSTX_TIMEOUT_MAX;
> +
> +	writel(CLK_DIV(div) | HSTX_TIMEOUT(tmp),
> +	       dsi->regs + MCTL_DPHY_TIMEOUT1);
> +
> +	writel(LPRX_TIMEOUT(tmp), dsi->regs + MCTL_DPHY_TIMEOUT2);
> +
> +	if (output->dev->mode_flags & MIPI_DSI_MODE_VIDEO) {
> +		switch (output->dev->format) {
> +		case MIPI_DSI_FMT_RGB888:
> +			tmp = VID_PIXEL_MODE_RGB888 |
> +			      VID_DATATYPE(MIPI_DSI_PACKED_PIXEL_STREAM_24);
> +			break;
> +
> +		case MIPI_DSI_FMT_RGB666:
> +			tmp = VID_PIXEL_MODE_RGB666 |
> +			      VID_DATATYPE(MIPI_DSI_PIXEL_STREAM_3BYTE_18);
> +			break;
> +
> +		case MIPI_DSI_FMT_RGB666_PACKED:
> +			tmp = VID_PIXEL_MODE_RGB666_PACKED |
> +			      VID_DATATYPE(MIPI_DSI_PACKED_PIXEL_STREAM_18);
> +			break;
> +
> +		case MIPI_DSI_FMT_RGB565:
> +			tmp = VID_PIXEL_MODE_RGB666_PACKED |
> +			      VID_DATATYPE(MIPI_DSI_PACKED_PIXEL_STREAM_16);
> +			break;
> +
> +		default:
> +			dev_err(dsi->base.dev, "Unsupported DSI format\n");
> +			return;
> +		}
> +
> +		if (output->dev->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE)
> +			tmp |= SYNC_PULSE_ACTIVE | SYNC_PULSE_HORIZONTAL;
> +
> +		tmp |= REG_BLKLINE_MODE(REG_BLK_MODE_BLANKING_PKT) |
> +		       REG_BLKEOL_MODE(REG_BLK_MODE_BLANKING_PKT) |
> +		       RECOVERY_MODE(RECOVERY_MODE_NEXT_HSYNC);
> +
> +		writel(tmp, dsi->regs + VID_MAIN_CTL);
> +	}
> +
> +	tmp = readl(dsi->regs + MCTL_MAIN_DATA_CTL);
> +	tmp &= ~(IF_VID_SELECT_MASK | HOST_EOT_GEN | IF_VID_MODE);
> +
> +	if (!(output->dev->mode_flags & MIPI_DSI_MODE_EOT_PACKET))
> +		tmp |= HOST_EOT_GEN;
> +
> +	if (output->dev->mode_flags & MIPI_DSI_MODE_VIDEO)
> +		tmp |= IF_VID_MODE | IF_VID_SELECT(input->id) | VID_EN;
> +
> +	writel(tmp, dsi->regs + MCTL_MAIN_DATA_CTL);
> +
> +	tmp = readl(dsi->regs + MCTL_MAIN_EN) | IF_EN(input->id);
> +	writel(tmp, dsi->regs + MCTL_MAIN_EN);
> +}
> +
> +static const struct drm_bridge_funcs cdns_dsi_bridge_funcs = {
> +	.attach = cdns_dsi_bridge_attach,
> +	.mode_valid = cdns_dsi_bridge_mode_valid,
> +	.disable = cdns_dsi_bridge_disable,
> +	.enable = cdns_dsi_bridge_enable,
> +};
> +
> +static int cdns_dsi_init_link(struct cdns_dsi *dsi)
> +{
> +	struct cdns_dsi_output *output = &dsi->output;
> +	unsigned long sysclk_period, ulpout;
> +	u32 val;
> +	int i;
> +
> +	writel(0, dsi->regs + MCTL_DPHY_STATIC);
> +
> +	val = 0;
> +	for (i = 1; i < output->dev->lanes; i++)
> +		val |= DATA_LANE_EN(i);
> +
> +	if (!(output->dev->mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS))
> +		val |= CLK_CONTINUOUS;
> +
> +	writel(val, dsi->regs + MCTL_MAIN_PHY_CTL);
> +
> +	/* ULPOUT should be set to 1ms and is expressed in sysclk cycles. */
> +	sysclk_period = NSEC_PER_SEC / clk_get_rate(dsi->sysclk);
> +	ulpout = DIV_ROUND_UP(NSEC_PER_MSEC, sysclk_period);
> +	writel(CLK_LANE_ULPOUT_TIME(ulpout) | DATA_LANE_ULPOUT_TIME(ulpout),
> +	       dsi->regs + MCTL_ULPOUT_TIME);
> +
> +	writel(LINK_EN, dsi->regs + MCTL_MAIN_DATA_CTL);
> +
> +	val = CLK_LANE_EN | PLL_START;
> +	for (i = 0; i < output->dev->lanes; i++)
> +		val |= DATA_LANE_START(i);
> +
> +	writel(val, dsi->regs + MCTL_MAIN_EN);
> +
> +	ndelay(100);
> +
> +	return 0;
> +}
> +
> +static int cdns_dsi_attach(struct mipi_dsi_host *host,
> +			   struct mipi_dsi_device *dev)
> +{
> +	struct cdns_dsi *dsi = to_cdns_dsi(host);
> +	struct cdns_dsi_output *output = &dsi->output;
> +	struct cdns_dsi_input *input = &dsi->input;
> +	struct drm_bridge *bridge;
> +	struct drm_panel *panel;
> +	struct device_node *np;
> +	int ret;
> +
> +	/*
> +	 * We currently do not support connecting several DSI devices to the
> +	 * same host. In order to support that we'd need the DRM bridge
> +	 * framework to allow dynamic reconfiguration of the bridge chain.
> +	 */
> +	if (output->dev)
> +		return -EBUSY;
> +
> +	/* We do not support burst mode yet. */
> +	if (dev->mode_flags & MIPI_DSI_MODE_VIDEO_BURST)
> +		return -ENOTSUPP;
> +
> +	/*
> +	 * The host <-> device link might be described using an OF-graph
> +	 * representation, in this case we extract the device of_node from
> +	 * this representation, otherwise we use dsidev->dev.of_node which
> +	 * should have been filled by the core.
> +	 */
> +	np = of_graph_get_remote_node(dsi->base.dev->of_node, DSI_OUTPUT_PORT,
> +				      dev->channel);
> +	if (!np)
> +		np = of_node_get(dev->dev.of_node);
> +
> +	panel = of_drm_find_panel(np);
> +	if (panel) {
> +		bridge = drm_panel_bridge_add(panel, DRM_MODE_CONNECTOR_DSI);
> +	} else {
> +		bridge = of_drm_find_bridge(dev->dev.of_node);
> +		if (!bridge)
> +			bridge = ERR_PTR(-EINVAL);
> +	}
> +
> +	of_node_put(np);
> +
> +	if (IS_ERR(bridge)) {
> +		ret = PTR_ERR(bridge);
> +		dev_err(host->dev, "failed to add DSI device %s (err = %d)",
> +			dev->name, ret);
> +		return ret;
> +	}
> +
> +	output->dev = dev;
> +	output->bridge = bridge;
> +	output->panel = panel;
> +
> +	ret = cdns_dsi_init_link(dsi);
> +	if (ret)
> +		goto err_rst_output;
> +
> +	/*
> +	 * The DSI output has been properly configured, we can now safely
> +	 * register the input to the bridge framework so that it can take place
> +	 * in a display pipeline.
> +	 */
> +	drm_bridge_add(&input->bridge);
> +
> +	return 0;
> +
> +err_rst_output:
> +	if (panel)
> +		drm_panel_bridge_remove(bridge);
> +
> +	output->bridge = NULL;
> +	output->panel = NULL;
> +	output->dev = NULL;
> +
> +	return ret;
> +}
> +
> +static int cdns_dsi_detach(struct mipi_dsi_host *host,
> +			   struct mipi_dsi_device *dev)
> +{
> +	struct cdns_dsi *dsi = to_cdns_dsi(host);
> +	struct cdns_dsi_output *output = &dsi->output;
> +	struct cdns_dsi_input *input = &dsi->input;
> +
> +	drm_bridge_remove(&input->bridge);
> +	if (output->panel)
> +		drm_panel_bridge_remove(output->bridge);
> +
> +	writel(0, dsi->regs + MCTL_MAIN_EN);
> +	writel(0, dsi->regs + MCTL_MAIN_DATA_CTL);
> +	writel(0, dsi->regs + MCTL_MAIN_PHY_CTL);
> +
> +	return 0;
> +}
> +
> +static irqreturn_t cdns_dsi_interrupt(int irq, void *data)
> +{
> +	struct cdns_dsi *dsi = data;
> +	irqreturn_t ret = IRQ_NONE;
> +	u32 flag, ctl;
> +
> +	flag = readl(dsi->regs + DIRECT_CMD_STS_FLAG);
> +	if (flag) {
> +		ctl = readl(dsi->regs + DIRECT_CMD_STS_CTL);
> +		ctl &= ~flag;
> +		writel(ctl, dsi->regs + DIRECT_CMD_STS_CTL);
> +		complete(&dsi->direct_cmd_comp);
> +		ret = IRQ_HANDLED;
> +	}
> +
> +	return ret;
> +}
> +
> +static ssize_t cdns_dsi_transfer(struct mipi_dsi_host *host,
> +				 const struct mipi_dsi_msg *msg)
> +{
> +	struct cdns_dsi *dsi = to_cdns_dsi(host);
> +	u32 cmd, sts, val, wait = WRITE_COMPLETED, ctl = 0;
> +	struct mipi_dsi_packet packet;
> +	int ret, i, tx_len, rx_len;
> +
> +	ret = mipi_dsi_create_packet(&packet, msg);
> +	if (ret)
> +		return ret;
> +
> +	tx_len = msg->tx_buf ? msg->tx_len : 0;
> +	rx_len = msg->rx_buf ? msg->rx_len : 0;
> +
> +	/* For read operations, the maximum TX len is 2. */
> +	if (rx_len && tx_len > 2)
> +		return -ENOTSUPP;
> +
> +	/* TX len is limited by the CMD FIFO depth. */
> +	if (tx_len > dsi->direct_cmd_fifo_depth)
> +		return -ENOTSUPP;
> +
> +	/* RX len is limited by the RX FIFO depth. */
> +	if (rx_len > dsi->rx_fifo_depth)
> +		return -ENOTSUPP;
> +
> +	cmd = CMD_SIZE(tx_len) | CMD_VCHAN_ID(msg->channel) |
> +	      CMD_DATATYPE(msg->type);
> +
> +	if (msg->flags & MIPI_DSI_MSG_USE_LPM)
> +		cmd |= CMD_LP_EN;
> +
> +	if (mipi_dsi_packet_format_is_long(msg->type))
> +		cmd |= CMD_LONG;
> +
> +	if (rx_len) {
> +		cmd |= READ_CMD;
> +		wait = READ_COMPLETED_WITH_ERR | READ_COMPLETED;
> +		ctl = READ_EN | BTA_EN;
> +	} else if (msg->flags & MIPI_DSI_MSG_REQ_ACK) {
> +		cmd |= BTA_REQ;
> +		wait = ACK_WITH_ERR_RCVD | ACK_RCVD;
> +		ctl = BTA_EN;
> +	}
> +
> +	writel(readl(dsi->regs + MCTL_MAIN_DATA_CTL) | ctl,
> +	       dsi->regs + MCTL_MAIN_DATA_CTL);
> +
> +	writel(cmd, dsi->regs + DIRECT_CMD_MAIN_SETTINGS);
> +
> +	for (i = 0; i < tx_len; i += 4) {
> +		const u8 *buf = msg->tx_buf;
> +		int j;
> +
> +		val = 0;
> +		for (j = 0; j < 4 && j + i < tx_len; j++)
> +			val |= (u32)buf[i + j] << (8 * j);
> +
> +		writel(val, dsi->regs + DIRECT_CMD_WRDATA);
> +	}
> +
> +	/* Clear status flags before sending the command. */
> +	writel(wait, dsi->regs + DIRECT_CMD_STS_CLR);
> +	writel(wait, dsi->regs + DIRECT_CMD_STS_CTL);
> +	reinit_completion(&dsi->direct_cmd_comp);
> +	writel(0, dsi->regs + DIRECT_CMD_SEND);
> +
> +	wait_for_completion_timeout(&dsi->direct_cmd_comp,
> +				    msecs_to_jiffies(1000));
> +
> +	sts = readl(dsi->regs + DIRECT_CMD_STS);
> +	writel(wait, dsi->regs + DIRECT_CMD_STS_CLR);
> +	writel(0, dsi->regs + DIRECT_CMD_STS_CTL);
> +
> +	writel(readl(dsi->regs + MCTL_MAIN_DATA_CTL) & ~ctl,
> +	       dsi->regs + MCTL_MAIN_DATA_CTL);
> +
> +	/* We did not receive the events we were waiting for. */
> +	if (!(sts & wait))
> +		return -ETIMEDOUT;
> +
> +	/* READ of WRITE with ACK failed. */
> +	if (sts & (READ_COMPLETED_WITH_ERR | ACK_WITH_ERR_RCVD))
> +		return -EIO;
> +
> +	for (i = 0; i < rx_len; i += 4) {
> +		u8 *buf = msg->rx_buf;
> +		int j;
> +
> +		val = readl(dsi->regs + DIRECT_CMD_RDDATA);
> +		for (j = 0; j < 4 && j + i < rx_len; j++)
> +			buf[i + j] = val >> (8 * j);
> +	}
> +
> +	return 0;
> +}
> +
> +static const struct mipi_dsi_host_ops cdns_dsi_ops = {
> +	.attach = cdns_dsi_attach,
> +	.detach = cdns_dsi_detach,
> +	.transfer = cdns_dsi_transfer,
> +};
> +
> +static int cdns_dsi_drm_probe(struct platform_device *pdev)
> +{
> +	struct cdns_dsi *dsi;
> +	struct cdns_dsi_input *input;
> +	struct resource *res;
> +	int ret, irq;
> +	u32 val;
> +
> +	dsi = devm_kzalloc(&pdev->dev, sizeof(*dsi), GFP_KERNEL);
> +	if (!dsi)
> +		return -ENOMEM;
> +
> +	input = &dsi->input;
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	dsi->regs = devm_ioremap_resource(&pdev->dev, res);
> +	if (IS_ERR(dsi->regs))
> +		return PTR_ERR(dsi->regs);
> +
> +	dsi->pclk = devm_clk_get(&pdev->dev, "pclk");
> +	if (IS_ERR(dsi->pclk))
> +		return PTR_ERR(dsi->pclk);
> +
> +	dsi->sysclk = devm_clk_get(&pdev->dev, "sysclk");
> +	if (IS_ERR(dsi->sysclk))
> +		return PTR_ERR(dsi->sysclk);
> +
> +	irq = platform_get_irq(pdev, 0);
> +	if (irq < 0)
> +		return irq;
> +
> +	ret = clk_prepare_enable(dsi->pclk);
> +	if (ret)
> +		return ret;
> +
> +	ret = clk_prepare_enable(dsi->sysclk);
> +	if (ret)
> +		goto err_dis_pclk;
> +
> +	val = readl(dsi->regs + ID_REG);
> +	if (REV_VENDOR_ID(val) != 0xcad) {
> +		dev_err(&pdev->dev, "invalid vendor id\n");
> +		return -EINVAL;
> +	}
> +
> +	val = readl(dsi->regs + IP_CONF);
> +	dsi->direct_cmd_fifo_depth = 1 << (DIRCMD_FIFO_DEPTH(val) + 2);
> +	dsi->rx_fifo_depth = RX_FIFO_DEPTH(val);
> +	init_completion(&dsi->direct_cmd_comp);
> +
> +	writel(0, dsi->regs + MCTL_MAIN_DATA_CTL);
> +	writel(0, dsi->regs + MCTL_MAIN_EN);
> +	writel(0, dsi->regs + MCTL_MAIN_PHY_CTL);
> +
> +	/*
> +	 * We only support the DPI input, so force input->id to
> +	 * CDNS_DPI_INPUT.
> +	 */
> +	input->id = CDNS_DPI_INPUT;
> +	input->bridge.funcs = &cdns_dsi_bridge_funcs;
> +	input->bridge.of_node = pdev->dev.of_node;
> +
> +	/* Mask all interrupts before registering the IRQ handler. */
> +	writel(0, dsi->regs + MCTL_MAIN_STS_CTL);
> +	writel(0, dsi->regs + MCTL_DPHY_ERR_CTL1);
> +	writel(0, dsi->regs + CMD_MODE_STS_CTL);
> +	writel(0, dsi->regs + DIRECT_CMD_STS_CTL);
> +	writel(0, dsi->regs + DIRECT_CMD_RD_STS_CTL);
> +	writel(0, dsi->regs + VID_MODE_STS_CTL);
> +	writel(0, dsi->regs + TVG_TBG_STS_CTL);
> +	writel(0, dsi->regs + DPI_IRQ_EN);
> +	ret = devm_request_irq(&pdev->dev, irq, cdns_dsi_interrupt, 0,
> +			       dev_name(&pdev->dev), dsi);
> +	if (ret)
> +		goto err_dis_sysclk;
> +
> +	dsi->base.dev = &pdev->dev;
> +	dsi->base.ops = &cdns_dsi_ops;
> +
> +	ret = mipi_dsi_host_register(&dsi->base);
> +	if (ret)
> +		goto err_dis_sysclk;
> +
> +	platform_set_drvdata(pdev, dsi);
> +
> +	return 0;
> +
> +err_dis_sysclk:
> +	clk_disable_unprepare(dsi->sysclk);
> +
> +err_dis_pclk:
> +	clk_disable_unprepare(dsi->pclk);
> +
> +	return ret;
> +}
> +
> +static int cdns_dsi_drm_remove(struct platform_device *pdev)
> +{
> +	struct cdns_dsi *dsi = platform_get_drvdata(pdev);
> +
> +	mipi_dsi_host_unregister(&dsi->base);
> +	clk_disable_unprepare(dsi->sysclk);
> +	clk_disable_unprepare(dsi->pclk);
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id cdns_dsi_of_match[] = {
> +	{ .compatible = "cdns,dsi-1.3.1" },

Do you really need version here? Wouldn't be enough checking ID_REG?
This is only suggestion, no strong feelings.

The rest looks OK, so with Eric's comments addressed you can add:
Reviewed-by: Andrzej Hajda <a.hajda@xxxxxxxxxxx>

 --
Regards
Andrzej

> +	{ },
> +};
> +
> +static struct platform_driver cdns_dsi_platform_driver = {
> +	.probe  = cdns_dsi_drm_probe,
> +	.remove = cdns_dsi_drm_remove,
> +	.driver = {
> +		.name   = "cdns-dsi",
> +		.of_match_table = cdns_dsi_of_match,
> +	},
> +};
> +module_platform_driver(cdns_dsi_platform_driver);
> +
> +MODULE_AUTHOR("Boris Brezillon <boris.brezillon@xxxxxxxxxxxxxxxxxx>");
> +MODULE_DESCRIPTION("Cadence DSI driver");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS("platform:cdns-dsi");
> +


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