drm/meson: add support for MIPI-DSI transceiver

The Amlogic G12A/G12B/SM1 SoCs embeds a Synopsys DW-MIPI-DSI transceiver
(ver 1.21a), with a custom glue managing the IP resets, clock and data
inputs similar to the DW-HDMI Glue on other Amlogic SoCs.

This adds support for the Glue managing the transceiver, mimicing the init
flow provided by Amlogic to setup the ENCL encoder, the glue, the transceiver,
the digital D-PHY and the Analog PHY in the proper way.

An optional "MEAS" clock can be enabled to measure the delay between each
vsync feeding the DW-MIPI-DSI transceiver.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Nicolas Belin <nbelin@baylibre.com>
Tested-by: Nicolas Belin <nbelin@baylibre.com> # on Khadas VIM3 + TS050 Panel
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230512-amlogic-v6-4-upstream-dsi-ccf-vim3-v5-12-56eb7a4d5b8e@linaro.org

1 files changed, 160 insertions, 0 deletions

diff --git a/drivers/gpu/drm/meson/meson_dw_mipi_dsi.h b/drivers/gpu/drm/meson/meson_dw_mipi_dsi.h
new file mode 100644
index 000000000000..e1bd6b85d6a3
--- /dev/null
+++ b/drivers/gpu/drm/meson/meson_dw_mipi_dsi.h
@@ -0,0 +1,160 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2020 BayLibre, SAS
+ * Author: Neil Armstrong <narmstrong@baylibre.com>
+ * Copyright (C) 2018 Amlogic, Inc. All rights reserved.
+ */
+
+#ifndef __MESON_DW_MIPI_DSI_H
+#define __MESON_DW_MIPI_DSI_H
+
+/* Top-level registers */
+/* [31: 4]    Reserved.     Default 0.
+ *     [3] RW timing_rst_n: Default 1.
+ *		1=Assert SW reset of timing feature.   0=Release reset.
+ *     [2] RW dpi_rst_n: Default 1.
+ *		1=Assert SW reset on mipi_dsi_host_dpi block.   0=Release reset.
+ *     [1] RW intr_rst_n: Default 1.
+ *		1=Assert SW reset on mipi_dsi_host_intr block.  0=Release reset.
+ *     [0] RW dwc_rst_n:  Default 1.
+ *		1=Assert SW reset on IP core.   0=Release reset.
+ */
+#define MIPI_DSI_TOP_SW_RESET                      0x3c0
+
+#define MIPI_DSI_TOP_SW_RESET_DWC	BIT(0)
+#define MIPI_DSI_TOP_SW_RESET_INTR	BIT(1)
+#define MIPI_DSI_TOP_SW_RESET_DPI	BIT(2)
+#define MIPI_DSI_TOP_SW_RESET_TIMING	BIT(3)
+
+/* [31: 5] Reserved.   Default 0.
+ *     [4] RW manual_edpihalt: Default 0.
+ *		1=Manual suspend VencL; 0=do not suspend VencL.
+ *     [3] RW auto_edpihalt_en: Default 0.
+ *		1=Enable IP's edpihalt signal to suspend VencL;
+ *		0=IP's edpihalt signal does not affect VencL.
+ *     [2] RW clock_freerun: Apply to auto-clock gate only. Default 0.
+ *		0=Default, use auto-clock gating to save power;
+ *		1=use free-run clock, disable auto-clock gating, for debug mode.
+ *     [1] RW enable_pixclk: A manual clock gate option, due to DWC IP does not
+ *		have auto-clock gating. 1=Enable pixclk.      Default 0.
+ *     [0] RW enable_sysclk: A manual clock gate option, due to DWC IP does not
+ *		have auto-clock gating. 1=Enable sysclk.      Default 0.
+ */
+#define MIPI_DSI_TOP_CLK_CNTL                      0x3c4
+
+#define MIPI_DSI_TOP_CLK_SYSCLK_EN	BIT(0)
+#define MIPI_DSI_TOP_CLK_PIXCLK_EN	BIT(1)
+
+/* [31:24]    Reserved. Default 0.
+ * [23:20] RW dpi_color_mode: Define DPI pixel format. Default 0.
+ *		0=16-bit RGB565 config 1;
+ *		1=16-bit RGB565 config 2;
+ *		2=16-bit RGB565 config 3;
+ *		3=18-bit RGB666 config 1;
+ *		4=18-bit RGB666 config 2;
+ *		5=24-bit RGB888;
+ *		6=20-bit YCbCr 4:2:2;
+ *		7=24-bit YCbCr 4:2:2;
+ *		8=16-bit YCbCr 4:2:2;
+ *		9=30-bit RGB;
+ *		10=36-bit RGB;
+ *		11=12-bit YCbCr 4:2:0.
+ *    [19] Reserved. Default 0.
+ * [18:16] RW in_color_mode:  Define VENC data width. Default 0.
+ *		0=30-bit pixel;
+ *		1=24-bit pixel;
+ *		2=18-bit pixel, RGB666;
+ *		3=16-bit pixel, RGB565.
+ * [15:14] RW chroma_subsample: Define method of chroma subsampling. Default 0.
+ *		Applicable to YUV422 or YUV420 only.
+ *		0=Use even pixel's chroma;
+ *		1=Use odd pixel's chroma;
+ *		2=Use averaged value between even and odd pair.
+ * [13:12] RW comp2_sel:  Select which component to be Cr or B: Default 2.
+ *		0=comp0; 1=comp1; 2=comp2.
+ * [11:10] RW comp1_sel:  Select which component to be Cb or G: Default 1.
+ *		0=comp0; 1=comp1; 2=comp2.
+ *  [9: 8] RW comp0_sel:  Select which component to be Y  or R: Default 0.
+ *		0=comp0; 1=comp1; 2=comp2.
+ *     [7]    Reserved. Default 0.
+ *     [6] RW de_pol:  Default 0.
+ *		If DE input is active low, set to 1 to invert to active high.
+ *     [5] RW hsync_pol: Default 0.
+ *		If HS input is active low, set to 1 to invert to active high.
+ *     [4] RW vsync_pol: Default 0.
+ *		If VS input is active low, set to 1 to invert to active high.
+ *     [3] RW dpicolorm: Signal to IP.   Default 0.
+ *     [2] RW dpishutdn: Signal to IP.   Default 0.
+ *     [1]    Reserved.  Default 0.
+ *     [0]    Reserved.  Default 0.
+ */
+#define MIPI_DSI_TOP_CNTL                          0x3c8
+
+/* VENC data width */
+#define VENC_IN_COLOR_30B   0x0
+#define VENC_IN_COLOR_24B   0x1
+#define VENC_IN_COLOR_18B   0x2
+#define VENC_IN_COLOR_16B   0x3
+
+/* DPI pixel format */
+#define DPI_COLOR_16BIT_CFG_1		0
+#define DPI_COLOR_16BIT_CFG_2		1
+#define DPI_COLOR_16BIT_CFG_3		2
+#define DPI_COLOR_18BIT_CFG_1		3
+#define DPI_COLOR_18BIT_CFG_2		4
+#define DPI_COLOR_24BIT			5
+#define DPI_COLOR_20BIT_YCBCR_422	6
+#define DPI_COLOR_24BIT_YCBCR_422	7
+#define DPI_COLOR_16BIT_YCBCR_422	8
+#define DPI_COLOR_30BIT			9
+#define DPI_COLOR_36BIT			10
+#define DPI_COLOR_12BIT_YCBCR_420	11
+
+#define MIPI_DSI_TOP_DPI_COLOR_MODE	GENMASK(23, 20)
+#define MIPI_DSI_TOP_IN_COLOR_MODE	GENMASK(18, 16)
+#define MIPI_DSI_TOP_CHROMA_SUBSAMPLE	GENMASK(15, 14)
+#define MIPI_DSI_TOP_COMP2_SEL		GENMASK(13, 12)
+#define MIPI_DSI_TOP_COMP1_SEL		GENMASK(11, 10)
+#define MIPI_DSI_TOP_COMP0_SEL		GENMASK(9, 8)
+#define MIPI_DSI_TOP_DE_INVERT		BIT(6)
+#define MIPI_DSI_TOP_HSYNC_INVERT	BIT(5)
+#define MIPI_DSI_TOP_VSYNC_INVERT	BIT(4)
+#define MIPI_DSI_TOP_DPICOLORM		BIT(3)
+#define MIPI_DSI_TOP_DPISHUTDN		BIT(2)
+
+#define MIPI_DSI_TOP_SUSPEND_CNTL                  0x3cc
+#define MIPI_DSI_TOP_SUSPEND_LINE                  0x3d0
+#define MIPI_DSI_TOP_SUSPEND_PIX                   0x3d4
+#define MIPI_DSI_TOP_MEAS_CNTL                     0x3d8
+/* [0] R  stat_edpihalt:  edpihalt signal from IP.    Default 0. */
+#define MIPI_DSI_TOP_STAT                          0x3dc
+#define MIPI_DSI_TOP_MEAS_STAT_TE0                 0x3e0
+#define MIPI_DSI_TOP_MEAS_STAT_TE1                 0x3e4
+#define MIPI_DSI_TOP_MEAS_STAT_VS0                 0x3e8
+#define MIPI_DSI_TOP_MEAS_STAT_VS1                 0x3ec
+/* [31:16] RW intr_stat/clr. Default 0.
+ *		For each bit, read as this interrupt level status,
+ *		write 1 to clear.
+ * [31:22] Reserved
+ * [   21] stat/clr of eof interrupt
+ * [   21] vde_fall interrupt
+ * [   19] stat/clr of de_rise interrupt
+ * [   18] stat/clr of vs_fall interrupt
+ * [   17] stat/clr of vs_rise interrupt
+ * [   16] stat/clr of dwc_edpite interrupt
+ * [15: 0] RW intr_enable. Default 0.
+ *		For each bit, 1=enable this interrupt, 0=disable.
+ *	[15: 6] Reserved
+ *	[    5] eof interrupt
+ *	[    4] de_fall interrupt
+ *	[    3] de_rise interrupt
+ *	[    2] vs_fall interrupt
+ *	[    1] vs_rise interrupt
+ *	[    0] dwc_edpite interrupt
+ */
+#define MIPI_DSI_TOP_INTR_CNTL_STAT                0x3f0
+// 31: 2    Reserved.   Default 0.
+//  1: 0 RW mem_pd.     Default 3.
+#define MIPI_DSI_TOP_MEM_PD                        0x3f4
+
+#endif /* __MESON_DW_MIPI_DSI_H */