drm/sprd: add Unisoc's drm mipi dsi&dphy driver

Adds dsi host controller support for the Unisoc's display subsystem.
Adds dsi phy support for the Unisoc's display subsystem.
Only MIPI DSI Displays supported, DP/TV/HMDI will be support
in the feature.

v1:
  - Remove dphy and dsi graph binding, merge the dphy driver into the dsi.

v2:
  - Use drm_xxx to replace all DRM_XXX.
  - Use kzalloc to replace devm_kzalloc for sprd_dsi structure init.

v4:
  - Use drmm_helpers to allocate encoder.
  - Move allocate encoder and connector to bind function.

v5:
  - Drop the dsi ip file prefix.
  - Fix the checkpatch warnings.
  - Add Signed-off-by for dsi&dphy patch.
  - Use the mode_flags of mipi_dsi_device to setup crtc DPI and EDPI mode.

v6:
  - Redesign the way to access the dsi register.
  - Reduce the dsi_context member variables.

v7:
  - Fix codeing style issue by checkpatch.
  - Drop the pll registers structure define.
  - Use bridge API instead of drm panel API.
  - Register mipi_dsi_host on probe phase;
  - Remove some unused function.

v8:
  - Fix missing signed-off-by.
  - Move component_add to dsi_host.attach callback.

Cc: Orson Zhai <orsonzhai@gmail.com>
Cc: Chunyan Zhang <zhang.lyra@gmail.com>
Signed-off-by: Kevin Tang <kevin.tang@unisoc.com>
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211207142717.30296-7-kevin3.tang@gmail.com

1 files changed, 126 insertions, 0 deletions

diff --git a/drivers/gpu/drm/sprd/sprd_dsi.h b/drivers/gpu/drm/sprd/sprd_dsi.h
new file mode 100644
index 000000000000..d858ebb11115
--- /dev/null
+++ b/drivers/gpu/drm/sprd/sprd_dsi.h
@@ -0,0 +1,126 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020 Unisoc Inc.
+ */
+
+#ifndef __SPRD_DSI_H__
+#define __SPRD_DSI_H__
+
+#include <linux/of.h>
+#include <linux/device.h>
+#include <linux/regmap.h>
+#include <video/videomode.h>
+
+#include <drm/drm_bridge.h>
+#include <drm/drm_connector.h>
+#include <drm/drm_encoder.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_print.h>
+#include <drm/drm_panel.h>
+
+#define encoder_to_dsi(encoder) \
+	container_of(encoder, struct sprd_dsi, encoder)
+
+enum dsi_work_mode {
+	DSI_MODE_CMD = 0,
+	DSI_MODE_VIDEO
+};
+
+enum video_burst_mode {
+	VIDEO_NON_BURST_WITH_SYNC_PULSES = 0,
+	VIDEO_NON_BURST_WITH_SYNC_EVENTS,
+	VIDEO_BURST_WITH_SYNC_PULSES
+};
+
+enum dsi_color_coding {
+	COLOR_CODE_16BIT_CONFIG1 = 0,
+	COLOR_CODE_16BIT_CONFIG2,
+	COLOR_CODE_16BIT_CONFIG3,
+	COLOR_CODE_18BIT_CONFIG1,
+	COLOR_CODE_18BIT_CONFIG2,
+	COLOR_CODE_24BIT,
+	COLOR_CODE_20BIT_YCC422_LOOSELY,
+	COLOR_CODE_24BIT_YCC422,
+	COLOR_CODE_16BIT_YCC422,
+	COLOR_CODE_30BIT,
+	COLOR_CODE_36BIT,
+	COLOR_CODE_12BIT_YCC420,
+	COLOR_CODE_COMPRESSTION,
+	COLOR_CODE_MAX
+};
+
+enum pll_timing {
+	NONE,
+	REQUEST_TIME,
+	PREPARE_TIME,
+	SETTLE_TIME,
+	ZERO_TIME,
+	TRAIL_TIME,
+	EXIT_TIME,
+	CLKPOST_TIME,
+	TA_GET,
+	TA_GO,
+	TA_SURE,
+	TA_WAIT,
+};
+
+struct dphy_pll {
+	u8 refin; /* Pre-divider control signal */
+	u8 cp_s; /* 00: SDM_EN=1, 10: SDM_EN=0 */
+	u8 fdk_s; /* PLL mode control: integer or fraction */
+	u8 sdm_en;
+	u8 div;
+	u8 int_n; /* integer N PLL */
+	u32 ref_clk; /* dphy reference clock, unit: MHz */
+	u32 freq; /* panel config, unit: KHz */
+	u32 fvco;
+	u32 potential_fvco;
+	u32 nint; /* sigma delta modulator NINT control */
+	u32 kint; /* sigma delta modulator KINT control */
+	u8 lpf_sel; /* low pass filter control */
+	u8 out_sel; /* post divider control */
+	u8 vco_band; /* vco range */
+	u8 det_delay;
+};
+
+struct dsi_context {
+	void __iomem *base;
+	struct regmap *regmap;
+	struct dphy_pll pll;
+	struct videomode vm;
+	bool enabled;
+
+	u8 work_mode;
+	u8 burst_mode;
+	u32 int0_mask;
+	u32 int1_mask;
+
+	/* maximum time (ns) for data lanes from HS to LP */
+	u16 data_hs2lp;
+	/* maximum time (ns) for data lanes from LP to HS */
+	u16 data_lp2hs;
+	/* maximum time (ns) for clk lanes from HS to LP */
+	u16 clk_hs2lp;
+	/* maximum time (ns) for clk lanes from LP to HS */
+	u16 clk_lp2hs;
+	/* maximum time (ns) for BTA operation - REQUIRED */
+	u16 max_rd_time;
+	/* enable receiving frame ack packets - for video mode */
+	bool frame_ack_en;
+	/* enable receiving tear effect ack packets - for cmd mode */
+	bool te_ack_en;
+};
+
+struct sprd_dsi {
+	struct drm_device *drm;
+	struct mipi_dsi_host host;
+	struct mipi_dsi_device *slave;
+	struct drm_encoder encoder;
+	struct drm_bridge *panel_bridge;
+	struct dsi_context ctx;
+};
+
+int dphy_pll_config(struct dsi_context *ctx);
+void dphy_timing_config(struct dsi_context *ctx);
+
+#endif /* __SPRD_DSI_H__ */